Axles and suspension 56
Steering 60
Brake system 61
Wheels and tires 63
Networking 65
Overall network 65
Automatic start/stop 70
Lights 72
Exterior lights 72
Interior illumination 74
Safety 75
Active/passive safety 75
3Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Driving assistance systems 78
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Systems at a glance 78
Lane Keeping Assist 80
Tire pressure monitor 81
Rear parking assist 82
Reversing camera 83
Distance warning function 84
Comfort 86
Climate control 86
Power windows 93
Seat heater 95
Vehicle protection 96
Anti-the alarm system 96
Central locking 97
Audio and communications 98
Telematics 98
Body 104
Bodyshell 104
Force progression during an accident 109
Assembly parts 111
Special tools 112
Chassis 112
Engine/transmission 113
Body 115
Workshop equipment 116
Body repair systems 116
Annex 117
Abbreviations 117
Index 119
4Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 6
Dear Reader,
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This Introduction into Service Manual presents the new
smartfortwocoupé and new smartforfour of model series
453.
The purpose of this manual is to inform you of the technical
highlights featured in this new vehicle in advance of its market launch. This brochure is intended to provide information
for people employed in service, maintenance and repair as
well as for aersales staff. It is assumed that the reader is
already familiar with the Mercedes-Benz and smart model
series currently on the market.
In terms of the contents, the emphasis in this Introduction
into Service Manual is on presenting new and modified components and systems.
This Introduction into Service Manual is not intended as an
aid for repairs or for the diagnosis of technical problems. For
such needs, more extensive information is available in the
Workshop Information System (WIS) and Xentry Diagnostics.
Preface
WIS is updated continuously. The information available there
always reflects the latest technical status of our vehicles.
This Introduction into Service Manual presents initial information about the new smartfortwocoupé and new smartforfour. The Introduction into Service Manual is not stored in
this form in WIS. The contents of this brochure are not updated. No provision is made for supplements.
We will publicize modifications and new features in the relevant WIS documents. The information presented in this Introduction into Service manual may therefore differ from the
more up-to-date information found in WIS.
All of the information relating to specifications, equipment and options is valid as of the copy deadline in June
2014 and may therefore differ from the current production
configuration.
Daimler AG
Retail Operations (GSP/OR)
Note
b
Wherever possible, the images in this brochure have
been designed to be language-neutral. Where this
was not possible, German or English texts appear in
exceptional cases.
Note
b
Information about the vehicles and about operating
the vehicle functions can be found online in the interactive owner's manual.
5Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 7
Overview
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Models and major assemblies
DesignationModelEngineTransmissionMarket launch
smart fortwo coupé453.341281.920700.121
700.410
smart fortwo coupé453.342281.920700.121
700.410
smart fortwo coupé453.344281.910700.122
700.411
smart forfour453.041281.920700.120
700.410
smart forfour453.042281.920700.120
700.410
smart forfour453.044281.910700.123
700.411
02/2015
11/2014
12/2014
03/2015
11/2014
02/2015
External view of smart fortwo coupé
6
P00.10-5664-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 8
Models and major assemblies
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Overview
External view of smart forfour
P00.10-5665-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
7
Page 9
Brief description
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Overview
Vehicle concept
The new smart is being introduced in November 2014 as the
successor to model series 451.
The new smart is available as the smart fortwo coupé (C453)
and smart forfour (W453). In order to take individual customer preferences into account, the new generation of the
smart features a "lines" concept.
Starting with the standard equipment, customers will have
the option of customizing their vehicle with three additional
lines which incorporate both technical and design variations.
The drivetrain concept is based solely on the three-cylinder
gasoline engines which are installed at the rear end of the
vehicle.
Dimensional concept
The new smart fortwo coupé and the new smart forfour renew and expand the smart product range in the segment of
micro-compact vehicles. The proportions of the predecessor
generation have largely been retained. Accordingly, the twoseater smart fortwo coupé has the same vehicle length of
2.69 m. The smart forfour contains the same features as
the smart fortwo coupé, the sole differences being a longer
wheelbase, an extended tridion safety cell and four doors
instead of two.
Note
b
Further information on the electrical systems in model
series 453 (e.g. function descriptions and locations
of electrical components) is available in the Workshop
Information System (WIS) under the Basic Knowledge/Functions (GF) information type.
8Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Brief description
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Innovations and new features
Active safety and driver assistance systems
• Distance warning function with visual and acoustic warning (SA)
• Crosswind Assist (standard)
• Rear parking assist (SA)
• Reversing camera (SA)
• Lane Keeping Assist (SA)
Powerplant
• New twinamic 6-speed dual clutch transmission (SA)
• Wide range of powerful, consumption/emission-reduced
and NVH-optimized gasoline engines
Suspension, chassis systems and brakes
• Sports suspension lowered by 10 mm (SA)
• Direct steering (SA) with small turning circle
• Vertically adjustable steering column (SA)
Overview
Information, multimedia and communications systems
• Audio system with AUX/USB interface, Bluetooth interface with hands-free system and audio streaming for
music transmission (SA)
• Digital radio for the DAB and DAB+ standards (SA)
• JBL sound system incl. 8-channel DSP amplifier and removable subwoofer in trunk (SA)
• Media system with multi-touch display, AUX/USB/SD
interface in the center console, voice control, Bluetooth
interface with hands-free system and audio streaming as
well as TomTom LIVE services as standard incl. communication costs and roaming for three years (SA)
• Radio preinstallation (SA)
Environment
• ECO start/stop function in combination with 52 kW and
66 kW engine version
• Gearshi recommendation indicator
• Ancillary equipment controlled according to demand
Body and interior equipment
• Readyspace seats for the rear of the smart forfour for optimal expansion of transport capacity according to needs
(SA)
9Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Overview
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38.1cm (15") light alloy wheels in
8-spoke design, painted black and
highly polished⁴
38.1cm (15") light alloy wheels in
5-spoke design, painted black and
highly polished⁴⁶
40.6cm (16") light alloy wheels with
8-Y-spoke design, painted black⁷
40.6cm (16") light alloy wheels in
5-double spoke design, painted
black and highly polished⁸
Standard
(Code R82)
Standard
(Code R82)
Standard
(Code R82)
Standard
(Code R82)
Standard
(Code R82)
Code R83Code R83Code R83Code R83Code R83
Code R88Code R88Code R88Code R88Code R88
Code R86Code R86Code R86Code R86Code R86
Code R87Code R87Code R87Code R87Code R87
-Code R95Code R95Code R95Code R95
-Code R91Code R91Code R91Code R91
Chassis
Sports suspension (-10mm) -Package
component
Package
component
Package
component
Package
component
Direct steering⁹Code 213Code 213Code 213Code 213Code 213
1 Not for USA
2 Not for 40.6cm (16'') wheels
3 Only with code ICPA
4 Not with code ICTA
5 Not for code ICTA, standard for code ICLA
6 Standard for code ICVA
7 Only with code ICTA, standard for code P70
8 Only with code P70, standard for code ICTA
9 Standard for code ICLA, ICVA, ICTA
11Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Overview
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Brief description
453 E10 R¹
(45kW MT)
Climate control
HeatingStandardStandardStandardStandardStandard
Manual air conditioning²Code I77----
Automatic air conditioning³-Code I01Code I01Code I01Code I01
Light systems
453 E10
(52kW MT)
453 E10
(52kW DCT)
453 E09 LA
(66kW MT)
453 E09 LA
(66kW DCT)
H4 headlamps with integrated
StandardStandardStandardStandardStandard
daytime running lights
Front fog lampsCode V07Code V07Code V07Code V07Code V07
Safety and the protection
Airbags for driver and front
StandardStandardStandardStandardStandard
passenger
Sidebags for driver and front
StandardStandardStandardStandardStandard
passenger
Knee airbag for driverStandardStandardStandardStandardStandard
Crash sensor for activation of ha-
StandardStandardStandardStandardStandard
zard warning system
Seat belt warning system for driver
StandardStandardStandardStandardStandard
and front passenger seat
Rear seat belt status indicator⁴StandardStandardStandardStandardStandard
1 Only for ECE/RoW RHD
2 Not for standard equipment
3 Not for Japan
4 Not for USA
5 Only in combination with code P26
6 Cruise control only without variable speed limiter in USA/Canada
13Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Overview
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Brief description
453 E10 R¹
(45kW MT)
Infotainment, navigation and communications
Radio preinstallationCode C08Code C08Code C08Code C08Code C08
Panoramic roof incl. sun protectionCode E22Code E22Code E22Code E22Code E22
Electric fabric folding roof¹Code E55Code E55Code E55Code E55Code E55
Ashtray and cigarette lighterCode I32Code I32Code I32Code I32Code I32
Vertically adjustable steering
Code J37²Code J37Code J37Code J37Code J37
column
1 Not for USA
2 Only for W453
3 Standard for code P74
14Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Brief description
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Equipment lines
The following list of equipment lines for the new smart enables the customer to design the interior and exterior of their
vehicle to meet individual requirements.
Passion (code ICLA)
The passion line features either a black/orange or black/
white color combination in the interior, giving it a very stylish
and modern appearance. The leather multifunction steering
wheel, the instrument cluster with 3.5" color display and the
direct steering combine a high-quality interior ambiance with
functionality.
• Direct steering with speed-dependent steering force assistance and variable steering ratio
• Instrument cluster with color 8.9 cm (3.5") display with
TFT technology and on-board computer
• Center console with drawer and double cup holder
• Reading lamp for front passenger
• Vanity mirror in sun visor for driver and front passenger
• Eyeglasses compartment for driver
• Grab handle for front passenger
• Trunk illumination
• Interior door opener in matt chrome
Interior features of the passion line:
• Seats with black/orange fabric upholstery or seats with
black/white fabric upholstery
• Matching instrument panel and door center panel in
orange fabric and accent trim parts in black/grey or instrument panel and door center panel in black fabric and
accent trim parts in white
• Leather multifunction steering wheel with 3-spoke design
• Leather shi lever knob
• Stowage compartment in ligate
15Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Brief description
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Overview
Prime (code ICVA)
The prime line features a classically elegant design thanks to
its black leather seats, among other features. Seat heaters
for the driver and front passenger add to the comfort, while
the Lane Keeping Assist system offers extra safety.
Exterior features of the prime line:
• 38.1cm (15") light alloy wheels in 5-double spoke design,
painted black and highly polished
• Black radiator grille
• Outside mirror caps in tridion color
• prime lettering in mirror triangle
• Lockable service cover
Interior features of the prime line:
• Seats with black leather upholstery and white decorative
seams
• Instrument panel and door center panels in black fabric
and accent trim parts in white
• Leather multifunction steering wheel with 3-spoke design
• Leather shi lever knob
• Stowage compartment in ligate
Comfort and functional equipment of prime line:
• Direct steering with speed-dependent steering force assistance and variable steering ratio
• Lane Keeping Assist with acoustic and visual warning
• Instrument cluster with color 8.9 cm (3.5") display with
TFT technology and on-board computer
• Seat heaters for driver and front passenger
• Center console with drawer and double cup holder
• Reading lamp for front passenger
• Vanity mirror in sun visor for driver and front passenger
• Eyeglasses compartment for driver
• Grab handle for front passenger
• Trunk illumination
• Interior door opener in matt chrome
16Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Brief description
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Proxy (code ICTA)
The proxy line is innovative and trendsetting. Its highlights
include the panoramic roof as well as leather-look seats and
white/blue fabric. A high level of entertainment and air conditioning comfort is provided by the Cool & Audio package,
while the standard sport package with 16" light alloy wheels
adds to the dynamism of the vehicle.
Exterior features of the proxy line:
• White tridion safety cell
• Panoramic roof with sun protection
(smart fortwo coupé only)
• 40.6cm (16") light alloy wheels in 5-double spoke design,
painted black and highly polished
• Sports suspension lowered by 10 mm
• White radiator grille
• Outside mirror caps in tridion color
• proxy lettering in mirror triangle
• Exhaust system with chrome-plated exhaust tip
• Lockable service cover
Overview
Comfort and functional equipment of prime line:
• Direct steering with speed-dependent steering force assistance and variable steering ratio
• Lane Keeping Assist with acoustic and visual warning
• Cool & Audio package with automatic air conditioning and
audio system
• Instrument cluster with color 8.9 cm (3.5") display with
TFT technology and on-board computer
• Center console with drawer and double cup holder
• Lockable glove compartment
• Reading lamp for front passenger
• Vanity mirror in sun visor for driver and front passenger
• Eyeglasses compartment for driver
• Grab handle for front passenger
• Trunk illumination
• Interior door opener in matt chrome
Interior features of the proxy line:
• Seats in white/blue leather-look/fabric
• Instrument panel and door center panel in blue fabric
• Leather multifunction sport steering wheel with 3-spoke
design
• Leather shi lever knob
• Sports pedal assembly made of brushed stainless steel
with rubber naps
• Stowage compartment in ligate
17Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Brief description
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Overview
Equipment packages
The following list of equipment packages for the new smart
enables the customer to design the interior and exterior of
their vehicle to meet individual requirements.
Cool & Audio package (code P31)
The Cool & Audio package includes the following
components:
• Manual air conditioning with dust and pollen filter (45 kW
engine)
• Automatic air conditioning with automatic temperature
control and combination filter with activated charcoal (52
kW and 66 kW engine)
• Smart audio system with AUX/USB interface, Bluetooth
interface with hands-free system, audio streaming for
music transmission and smart cross connect for iOS and
Android
Cool & Media package (code P26)
The Cool & Media package includes the following
components:
• Automatic air conditioning with automatic temperature
control and combination filter with activated charcoal
• smart media system with 17.8 cm (7") capacitive multi-
touch display, AUX/USB interface (center console), voice
control, Bluetooth interface with hands-free system, audio streaming for music transmission, navigation system
incl. three years of Live Services
Comfort package (code P74)
The Comfort package includes the following components:
• Electrically adjustable and heated outside mirrors
• Vertically adjustable driver seat
• Steering column with manual vertical adjustment
LED & sensor package (code P25)
The LED & sensor package includes the following
components:
• Rain/light sensor
• Front fog lamps
• H4 headlamps with welcome function, integrated daytime
running lights with LED fiber-optic technology and LED
taillamps
Sport package (code P70)
Exterior features of sport package:
• 40.6cm (16") light alloy wheels with 8-Y-spoke design,
painted black
• Sports suspension lowered by 10 mm
• Exhaust system with chrome-plated exhaust tip
Interior features of sport package:
• Leather multifunction sport steering wheel with 3-spoke
design
• Sports pedal assembly in brushed stainless steel with
rubber naps
18Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 20
Front
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Now in its third generation, the smart has a more mature
overall appearance and yet remains unmistakably smart.
Typical features of the brand include the graphic elements
separating the components through a dual color scheme and
the striking tridion design in conjunction with the compact
front and rear ends.
Vehicle views
The previous "onebox" proportions have been slightly changed in the area of engine hood height in order to improve
active/passive safety. Simply changing the angles at the
front end has improved pedestrian protection, which is of
particular importance in urban traffic situations. The refined
radiator grille looks like an integrated net, which is smoothly
amalgamated into the front-end design. The new headlamps
with their design principles and clear glass lenses emphasize
the newfound maturity of this vehicle generation.
Overall vehicle
Front view of smart fortwo coupéFront view of smart forfour
P00.00-5254-00P00.00-5253-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
19
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Overall vehicle
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Vehicle views
Rear end
At the rear end of the new smart fortwo coupé, the raised
lettering on the lower part of the split ligate indicates the
brand identity. As on predecessor models, the separation of
the upper and lower parts provides loading versatility for both
light and heavy items. The top edge takes the form of a roof
spoiler with integrated center high-mounted brake lamp.
The rear lamps, which are set into the tridion safety cell,
give the design a particular sense of quality and underline
the width of the vehicle at the rear end. The license plate is
mounted between the lamps in the ligate. The bottom edge
of the bumper, which is painted in the vehicle color, is black
and has a cutout on the le (viewed in the direction of travel)
for the visible tailpipe of the exhaust system. A sport exhaust
tip is available for the exhaust system, while the bumper also
houses the distance sensors.
In principle, the smart forfour features the same design
elements as the smart fortwo coupé. However, it has a onepiece, upward-opening ligate with smart logo, which also
accommodates the reversing camera special equipment.
On this variant, the license plate is fitted to the dual-color
bumper.
Rear view of smart fortwo coupéRear view of smart forfour
20
P00.00-5255-00P00.00-5256-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 22
Side
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The most noticeable difference between the two-seater and
four-seater is found at the side: The smart fortwo coupé has
large doors, which extend into the B-pillar, and frameless
windows. The door contour and the tridion safety cell reflect
the smart design genes even when viewed from some distance, which is what makes the vehicle so unmistakable on
the road. The brand image is further enhanced by a characteristic swage line on each vehicle, positioned roughly in the
center of the doors. These features are further complemented by the tank cap on the right and the air inlet for the rearmounted engine on the le underneath the B-pillar.
Vehicle views
The side view of the four-seater reveals the same elements
as the two-seater, but with two additional doors and a longer
tridion safety cell. The front and rear overhangs have an identical appearance to those of its little brother.
The range of wheels extends from steel wheels through to
exclusive light alloy wheels (15 and 16-inch) in monochrome
or high-sheen machined versions.
Overall vehicle
Side view of smart fortwo coupéSide view of smart forfour
P00.00-5258-00P00.00-5259-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
21
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Overall vehicle
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Dimensions
1.555
424
1.469
303
516
1.873
2.695
1.361
482
1.009
406
624
1.430
1.6631.893
605
743
398
1.311
Vehicle dimensions of C453
Dimensions under no load
22
P00.10-5666-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 24
1.555
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Dimensions
Overall vehicle
27,7°
1.469
1.430
1.6631.893
1.750
776
1
424
113
1
1.873
14,3°
1
35,5°1
398
2.695
3.235
2.916
6,95 m
7, 30 m
Vehicle dimensions (garage dimensions) C453
Dimensions under no load
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
2,59 m
P00.10-5667-00
23
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Overall vehicle
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Dimensions
1.554
528
1.467
1.875
303
482
516
1.339
1.023
2.494
3.495
326
633
456
1.337
952
575
377
1.429
1.665
613
753
473
1.308
Vehicle dimensions W453
Dimensions under no load
24
1.279
P00.10-5668-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 26
1.554
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Dimensions
Overall vehicle
22,0°
1.467
1.429
1.6651.875
2.012
1.8711.871
1
528
108
1
2.494
10,2°
1
33,1°1
473
3.495
2.650
8,65 m
8,95 m
Vehicle dimensions (garage dimensions) W453
Dimensions under no load
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
3,78 m
P00.10-5669-00
25
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Overall vehicle
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Technical data
Comparison of model series 451 with model series 453
Dimensions and weightsUnitC451C453W453
Vehicle lengthmm269526953495
Vehicle width with outside mirrors folded out
Vehicle width
With outside mirrors folded in
Vehicle heightmm156515551554
Wheelbasemm186718732494
Front overhangmm425424528
Rear overhangmm403398473
Front track widthmm128314691467
Rear track widthmm138514301429
Curb weight (DIN)kg750880975
Permissible gross vehicle weightkg102011501400
Max. payload (DIN)kg270270425
Max. seating capacity224
Trunk capacity
(with TIREFIT)
mm175218931875
mmNo data17471733
l220/340260/350185 –255
Turning circle (wall-to-wall)m8.757.308.95
Tank capacityl332828
26Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 28
Technical data
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V 211-2:
Open luggage compartment behind rear seats
Loaded to top edge of rear backrest
Volume 185liters
V 211-2: Cargo position:
Open luggage compartment behind rear seats
Rear backrest in cargo position
Loaded to top edge of rear backrest
Volume 215liters
V 214-2:
Open luggage compartment behind rear seats
Loaded to roof
Volume 255liters
Overall vehicle
450
V 214-2: Cargo position:
Open luggage compartment behind rear seats
Rear backrest in cargo position
Loaded to roof
Volume 315liters
V 211-1:
Open luggage compartment behind driver seat
Rear backrest folded down
Loaded to 450 mm above loading floor
Volume 730liters
V 214-1:
Open luggage compartment behind driver seat
Rear backrest folded down
Loaded to roof
Volume 975liters
Largest rectangular object:
Dimensions 950x 800x 450mm
Volume 255liters
Cargo area variants as per DIN 70020 (W453)
P00.00-5261-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Longest board:
Dimensions: 2600x 25x 25mm
27
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Overall vehicle
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Panoramic roof
Panoramic roof
A transparent panoramic roof with manually adjustable sun
protection is available as special equipment for the new
smart.
The panoramic roof enhances the feeling of space in the vehicle. The roller blind allows the entry of heat to be reduced
in direct sunlight.
The sun protection takes the form of a fabric roller blind and
extends across the entire transparent area of the panoramic
roof.
As is usual on smart vehicles, the roof module is bonded to
the vehicle cell. On the smart coupé, the panoramic roof is
made of polycarbonate. Two panes of mineral glass are used
on the smart sedan.
View of panoramic roof incl. sun protection on C453View of panoramic roof incl. sun protection on W453
28
P77.21-2471-00P77.21-2472-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 30
Electric fabric folding roof (W453 only)
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An electrically powered folding roof made of fabric is available as special equipment. Extending almost to the C-pillar,
the folding roof provides the largest possible opening and
creates a friendly and bright interior compartment when
open.
The folding roof is made of black fabric, mounted on a plastic
frame of the same color and guided by rails at the side. The
fabric is stretched across several bows for the purpose of
stabilization. On the inside, the folding roof is lined with grey
fabric. The control unit for the functions of the folding roof
is integrated in the electric drive unit, which is located in the
rear roof area.
Folding roof
The folding roof opens or closes aer actuation of the control
(long push) in approx. 10 seconds. In the process, the front
roof bow moves back towards the rear end of the vehicle or
forward towards the windshield. The operating switch is located in the center console. It is possible to close the roof while
driving up to max. 100 km/h.
Overall vehicle
Electric fabric folding roof (W453 only)
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P77.00-2511-00
29
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Overall vehicle
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Interior
Interior design
Careful attention has been paid to developing the interior,
which presents itself in a high-quality, modern and much
more emotional design. Large areas of the instrument panel
have a textile covering, providing a unique "feeling of home"
with very good haptic properties. It is a unique selling proposition for vehicles of this class.
A three-spoke steering wheel with keypad allows operation
of the smart media system, which is positioned centrally in
the instrument panel (volume, voice control). This takes the
form of is a touch-operated human-machine interface, which
appears to float over the instrument panel and features a design in harmony with contemporary consumer electronics.
A new additional instrument for the combined display of rpm
and the time is located next to the instrument panel. The
eyeball vents are operated easily and intuitively and ensure
maximum ventilation comfort.
An optional panoramic roof and, for the smart forfour, a fabric folding roof are available to provide a particularly light and
airy feeling in the interior compartment. On the four-seater,
the readyspace seats special equipment option is available
in place of the rear bench seat as a clever space-saving solution. This quickly and easily creates additional space for suitcases and luggage, without having to fold down the backrest
of the rear bench seat.
Interior design
30
P68.00-7741-00
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Page 32
Interior
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Overall vehicle
Rear interior design of sedan
P91.12-3836-00
readyspace seats interior concept
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P91.12-3837-00
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1513
Overall vehicle
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Interior
Storage and stowage compartments
Alongside the glove compartment located in the instrument
panel, the new smart is equipped with door stowage compartments at the front and rear as standard (W453 only). A
lockable glove compartment is available as special equipment. The improved center console features a drawer and a
pen tray.
In addition, the new smart has cupholders in the front and
rear area of the center console as well as a rear center console with roller blind compartment and double cupholder
(only with readyspace option W453).
Ruffled pockets on the driver and front passenger backrests
are available optionally.
A stowage compartment in the ligate is available as special
equipment on the smart fortwo coupé. The customer can
also choose between the following load compartment covers:
1 Door stowage compartment
2 Double cup holder
3 Single cup holder
32
P68.00-7742-00
4 Rear center console with roller blind compartment
5 Glove compartment
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 34
Instrument panel
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The upper part of the instrument panel is injection molded
with a pitted surface (standard equipment) or can optionally
be manufactured with a natural fibre carrier material, which
is covered with a fabric variant corresponding to one of the
equipment lines. As on other model series, the cockpit module is also preassembled according to standard assembly
principles.
The preassembled components include the cockpit crossmember, air conditioner housing, wiring harness, telematics
units and others. The preassembled module is then bolted to
the vehicle in the longitudinal and transverse directions.
Interior
The controls on the instrument panel include a switch panel
for the driver assistance systems next to the steering wheel
and the controls for the hazard warning system and door
locking system positioned centrally above the smart audio
system or smart media system. The operating unit for the
heater/air conditioning is also located centrally under the
smart audio system or smart media system.
Overall vehicle
Instrument panel
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P68.10-4770-00
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Overall vehicle
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Interior
Instrument cluster
A semi-circular instrument cluster provides the driver with all
of the information required to operate the vehicle. The basic
version of the instrument cluster features a centrally located
LCD display of approx. 76x39mm in size. On the Passion,
Prime and Proxy equipment lines, there is a color display in
the same position (resolution 360x240pixels) for the onboard computer. The speed is displayed on an arc around the
edge of the display, while warning messages and indicators
for the various systems are arranged concentrically around it.
Depending on the vehicle equipment, the menu functions are
controlled via buttons on the control stalk or buttons on the
multifunction steering wheel.
The additional instruments for time and rpm previously installed in the center of the instrument panel will in future be
combined in one indicator (SA) next to the instrument cluster.
Instrument cluster (standard)
P54.33-4117-00
Instrument cluster (equipment line)
Additional instrument (SA)
P54.33-4118-00
P54.33-4119-00
S4/5s1
Menu navigation button group
S4/5s1 Scroll forward button
S4/5s2 OK button
34
S4/5s2
P54.33-4120-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 36
Arrangement of indicators
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Interior
A1e17
A1e66
A1e63A1e77A1e41
A1e15
A1e9
A1e1
A1e57
A1e3
A1e67
A1e18
Instrument cluster (ECE) arrangement
A1e1 Le turn signal indicator light
A1e2 Right turn signal indicator light
A1e3 High beam indicator lamp
A1e5 Alternator warning lamp
A1e7 Brake fluid and parking brake warning lamp
A1e9 Seat belt warning lamp
A1e15 Supplemental restraint system indicator lamp
A1e17 Anti-lock braking system indicator lamp
A1e18 Rear fog light indicator lamp
A1e23 Distance warning function indicator lamp
A1e38 Standing lights indicator lamp
A1e41 Electronic Stability Program warning lamp
A1e52 Distance warning function warning lamp
A1e23
A1e52
A1e54 Coolant temperature warning lamp
A1e57 Front fog lamp indicator lamp
A1e58 Engine diagnosis indicator lamp
A1e61 Oil pressure warning lamp
A1e62 ECO start/stop function not available indicator lamp
A1e63 ECO start/stop function available indicator lamp
A1e66 Tire pressure monitor warning lamp
A1e67 Low beam indicator lamp
A1e70 Power steering warning lamp
A1e77 Door open warning lamp
A1p8 Speedometer
A1p13 Multifunction display
A1p8
A1e62
A1e54
A1e61
A1e5
A1e7
A1e2
A1e70
A1e58
A1p13
P54.33-4121-00
Overall vehicle
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
35
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Overall vehicle
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Interior
Center console
The center console consists of three parts. The first part
joins up with the instrument panel at the front and features
a double cup holder, pen tray and drawer. The center part
is positioned behind it with the gearshi/selector lever and
mount for the handbrake lever. Next to the gearshi/selector
lever on the right is the switch for the optional electric fabric
folding roof or a coin holder. To the le are the switches for
the shi programs of the twinamic 6-speed dual clutch transmission. Further to the rear are the handbrake lever, a 12 V
socket, an additional cupholder and an armrest as special
equipment as well as the Connectivity Hub as part of the
"smart media system" special equipment.
Center console - Rear area
P68.20-4851-00
Center console - Front area
36
P68.20-4852-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 38
Seats
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The seats in both the front and the rear have a striking sporty
design and are similar in appearance to integral sport seats
with integrated head restraints. The le and right seats in the
rear have the characteristics of individual seats. The high variability of the seats provides a versatile vehicle interior.
The new seats fulfill a wide range of different requirements in
the areas of seating comfort, ergonomics, passive safety and
sportiness.
The characteristic features of the seats include the use of
high-strength steels, the half-cushion shell with comfort
supporting springs and high backrests with pronounced side
supports. The padding of the seat cushions and backrests
consists of PUR foam.
Seats
In order to simultaneously fulfill the requirements for comfort
and lateral support, the foam cushion padding incorporates
different hardness zones, while the side areas make use of
harder foam.
Due to the higher backrest pivot point, it is possible to fold
the backrests down fully onto the seat cushion. Depending
on the equipment installed, this is facilitated by a latch fitting
on the front passenger seat. Latch fittings are available on
the driver and front passenger seat on the coupé. The front
passenger seat of the coupé is equipped with ISOFIX mounts
with insertion guides for convenient attachment of a child
seat.
Overall vehicle
Front seats
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Overall vehicle
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Seats
Rear seats of smart forfour
The rear seats of the smart forfour provide great variability
for the interior compartment. In addition, the backrests are
optionally available with a 50:50 folding split. Even on vehicles with standard equipment, the entire backrest can be
folded down onto the seat cushions aer the backrest lock
is released, to provide an almost flat cargo area. The rear
seats have a distinct individual seat character with removable
L-shaped head restraints. The standard ISOFIX mounts each
have an insertion guide for more convenient attachment of a
child seat.
The backrests of the rear bench seat can be moved into a
12° steeper position (cargo position), thus enlarging the
cargo area volume (special equipment). Despite the more
upright position of the backrest, the rear bench seat can be
used by vehicle occupants. It is possible to use a rearwardfacing infant seat in both backrest positions.
Rear seat of smart forfour in cargo positionRear seat of smart forfour folded down
38
P68.80-2110-00P68.80-2111-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 40
readyspace seats in smart forfour
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The readyspace seats are available in place of the rear bench
seat as special equipment. This solution quickly and easily
creates additional space for suitcases and luggage, without
having to fold down the backrest of the rear bench seat. The
seat cushions of the rear bench seat can easily and individually (50:50) be swiveled into the footwell in front of the bench
seat, thus providing a lowered and flat surface for larger
objects.
Seats
Overall vehicle
readyspace seats in smart forfour
P91.12-3839-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
39
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Maintenance
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Maintenance
Maintenance concept
Maintenance of the new model series 453 (smart) consists
of requirement-based maintenance (BOW) for the first time.
Here, the age and mileage of the vehicle are taken into account for the service scopes. In addition, use of the DSB
(Digital Service Booklet) by workshops will also be possible
at market launch in those countries which already offer it for
Mercedes-Benz cars.
Another area where maintenance has been harmonized with
Mercedes-Benz cars is in the changes to "Oil Service Plus"
and "Maintenance". Like Mercedes-Benz cars, smart maintenance now also consists of an alternating Service A and
B as well as an optionally available "customer package". The
following fixed maintenance intervals apply, with the exception of possible country-specific variations in the kilometer
intervals:
• Service A aer 20,000km or one year
• Service B aer 40,000km or two years
Maintenance interval display (WIA)
The maintenance interval display is located within the multifunction display of the instrument cluster. It shows the remaining distance (in km/mi) or the remaining time (in days) until
the next service. The number of wrenches indicates the type
of service due. The symbol with one wrench means Service A
and the service with two wrenches means Service B.
If a service is due within the next 1500 km or 30 days, the
driver is notified of this on the instrument cluster every time
he or she restarts the vehicle in the form of a wrench symbol
which flashes for 10 seconds. On equipment lines with TFT
display, a text message appears on the screen. Once the
service has been completed, the service interval display can
be reset either using STAR DIAGNOSIS or directly on the instrument cluster.
Changes to additional maintenance operations in comparison with model series 451
ServiceService interval of model series
451
Service interval of model series
453
Replace air filter element Every 40,000km Every 60,000 km/3years *
Replace spark plugs Every 40,000km Every 80,000 km/4years *
Engine: Replace coolant Every 60,000km/4years *Every 120,000km
Replace brake fluidAer 2 years for the first timeAer 3 years for the first time, then
every 2 years
Check and correct headlamp
adjustment
At each Service BAer 3 years for the first time, then
every 2 years
Rear axle: Check brake pad thicknessAt each Service A/BAt 80,000km for the first time/then
at each Service B
* depending on first occurrence
40Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 42
Maintenance
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Maintenance points in front compartment
As on the predecessor model series 451, the vehicle features
a service flap which is fixed in place with straps and extends
across almost the entire width of the vehicle at the front.
This allows convenient access to all maintenance items in the
front compartment.
The most important maintenance points in the front compartment are:
• Windshield washer fluid reservoir
• Coolant expansion reservoir
• Brake fluid reservoir
• Lamp units for bulb replacement
Maintenance points in engine compartment
As in model series 451, the maintenance points in the engine
compartment are accessible through an engine compartment
cover in the luggage compartment floor.
The most important maintenance points in the engine compartment are:
• Oil filler neck
• Oil dipstick
• Air filter housing
• Spark plugs
Maintenance
Maintenance points in front compartment
1 Coolant expansion reservoir
2 Brake fluid reservoir
3 Windshield washer fluid reservoir
4 Lamp units for bulb replacement
P00.20-2824-00
Note
B
For more information on maintenance of model series
453, see the corresponding AP documents in WIS.
The new M281 gasoline engines are all based on the same
engine platform. The different power variants are obtained
through different soware versions and turbocharging.
The different power variants of the M281 all fulfill the EU 6
emissions standard.
Charging
A turbocharger with bypass valve (wastegate) is used on the
new smart.
On the turbocharged engine, boost pressure control is
carried out through an electronically controlled boost pressure control flap, which is actuated by the engine control
unit in accordance with a characteristics map and the load
requirement.
Note
B
Further information on the engine control system can
be found in the relevant GF documents in WIS.
Powerplant
M281 (naturally aspirated engine)
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P01.10-3270-00
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Engine M281
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Powerplant
UnitM281 E10 RM281 E10
Engine data
Rated output
at engine speed
Rated torque
at engine speed
Boost pressure max.bar--
Compression ratio ε10.510.5
kW
rpm
Nm
rpm
45
6000
87
3500
52
6000
91
2850
44Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 46
Engine M281
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UnitM281 E09 LA
Engine data
Rated output
at engine speed
Rated torque
at engine speed
kW
rpm
Nm
rpm
66
5500
135
2500
Boost pressure max.bar2.3
Compression ratio ε9.5
Powerplant
70
60
50
40
P [kW]
30
20
10
0
1250
2000
2750
3500
n [1/min]
Performance graph of M281.920 (66kW)
M Torque
P Power
n Rpm
4250
5000
5750
140
130
120
110
100
90
80
70
6500
M [Nm]
P01.00-3568-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
45
Page 47
Cooling
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Powerplant
Cooling system
Depending on the equipment variant, the new smart can be
equipped with up to two independently operating coolant
circuits. A high-temperature (HT) circuit, which also cools the
turbocharger in addition to the engine and cylinder head, as
well as a low-temperature (NT) circuit used for temperature
regulation of the charge air.
Vehicles without turbocharger are only equipped with a hightemperature (HT) circuit.
The vehicle is also equipped with an additional fan at the rear
end.
Note
B
The cooling system must be filled and bled only when
the engine is cold.
32
1
9
647 8
5
Cooling components of turbocharged engine
1 NT radiator (only with turbo)
2 Engine radiator (HT radiator)
3 Expansion reservoir
4 Additional fan
5 Turbocharger
46
P20.00-2542-00
6 Engine oil cooler
7 Low-temperature circuit
8 High-temperature circuit
9 Fan housing with fan motor
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 48
Exhaust system
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M281 exhaust system
Two variants of exhaust system are used to remove the combustion gases of the rear-mounted engine:
• Exhaust system of naturally aspirated engine
• Exhaust system of turbocharged engine
• Exhaust system of naturally aspirated engine for sport
package
• Exhaust system of turbocharged engine for sport package
These exhaust systems differ with respect to their internal
and external design.
The exhaust systems consist of:
• Catalytic converter
• Decoupling element
• Rear muffler
Vehicles with sport package feature an exhaust system with
chrome-plated exhaust tip.
Powerplant
45
2
P49.10-3083-00P49.10-3084-00
Exhaust system of naturally aspirated engine
1 Catalytic converter
2 Rear muffler
3 Decoupling element
4 Oxygen sensor upstream of catalytic converter
5 Oxygen sensor downstream of catalytic converter
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
156
31
Exhaust system of turbocharged engine
1 Turbocharger
2 Rear muffler
3 Catalytic converter
4 Decoupling element
5 Oxygen sensor upstream of catalytic converter
6 Oxygen sensor downstream of catalytic converter
2
43
47
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Fuel system
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Powerplant
M281
A non-return fuel system is used for the fuel supply in model
series 453.
The fuel is delivered to the engine by a vertical delivery
module integrated in the fuel tank. On this system, the fuel
pump supplies the required quantity of fuel at the required
pressure (max. 5.2bar) to the fuel injection system (fuel distribution rail).
The fuel tank fill level is measured by a float-and-lever sensor
and evaluated and displayed on the instrument cluster.
43
View of M281 fuel system (ECE/RoW)
1 Pump
2 Delivery module with integrated filter and fuel pressure regulator
48
12
P47.00-2240-00
3 Injection nozzle
4 Fuel distribution rail
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Page 50
Fuel system
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Fuel tank
The fuel tank is located in front of the rear axle viewed in the
direction of travel.
The fuel tank is manufactured using a co-extrusion process
and features six layers of high-density polyethylene (HDPE)
with a block layer of ethylene vinyl alcohol copolymer (EVOH).
The filling capacity of the fuel tank is 28liters, including a
reserve of 5 liters. A tank with 35-liter capacity is available
optionally.
The expansion volume is inside the fuel tank itself.
For permeation-related reasons, the US version of the tank
features a stainless steel filler neck and the tank has a filling
capacity of 33 liters.
Powerplant
View of gasoline engine fuel tank
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P47.10-2765-00
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5-speed manual transmission
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Brief description
Transmission
The manual transmission of model 700.1 is a fully synchronized two-sha transmission with five forward gears and one
reverse gear.
The transmission housing of the manual transmission is made
of a light alloy and the housing parts are sealed with liquid
gasket.
The essential features of the manual transmission are:
• Gear request transmission via cables
• Hydraulically operated central clutch release bearing for
clutch operation
• Double-cone synchronization for transferring high frictional forces during acceleration or braking of the control
gears during gear changing
• Integrated pinion differential
• Contactless position determination of main shier sha
• Consumption and rpm-reducing fih gear
• Rotation direction reversal without reversing gear
The 5-speed manual transmission is available for all engine
power variants of the new smart.
5-speed manual transmission
50
P26.00-2173-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 52
5-speed manual transmission
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Lubrication supply
Lubricant supply for the manual transmission takes the form
of centrifugal and immersion lubrication. Adequate supply
of the rear gear sets and synchronizers with lubricating oil is
achieved through a transmission oil ducting system. The differential runs in the oil sump.
Shi mechanism
The manual transmission of model 700.1 is characterized
by a precise, smooth shi mechanism as well as short shi
travel distances. Synchronization of the first and second gear
is carried out by a double-cone synchronizer, while the third,
fourth and fih gear together with the reverse gear are synchronized by a single-cone synchronizer.
Advantages
The manual transmission has the following advantages:
• Compact design with low weight
• Low maintenance costs due to lifetime filling
• Precise and smooth gearshiing
• Low driving noise
• High reliability and long service life
Transmission
Note
B
For information about adjusting the cables and gearshi lever, see the Workshop Information System
(WIS).
51Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 53
twinamic 6-speed dual clutch transmission
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Brief description
Transmission
Model series 453 is available with the newly developed twinamic 6-speed dual clutch transmission.
This dual clutch transmission has a three-sha design and
consists of two sub-transmissions, each with its own clutch,
with six forward gears and one reverse gear.
The dual clutch transmission provides sporty vehicle dynamics while also offering customers the convenience of an
automatic transmission.
The most important features of the twinamic are:
• Dry, electromechanically operated dual clutch
• Integrated pinion differential
• Gear changing without power interruption
• "Shi by wire, park by cable"
• Steering wheel gearshi buttons for engaging the individual gears when "Manual" transmission mode is selected
(SA)
• Transmission control unit integrated in the transmission
housing
The twinamic is suitable for usage with the start/stop
function.
twinamic 6-speed dual clutch transmission
52
P27.00-2443-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 54
twinamic 6-speed dual clutch transmission
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Shi mechanism
On the twinamic 6-speed dual clutch transmission, the engine torque is transferred from the cranksha of the combustion engine to a two-mass flywheel. From there, the power
flows to the internal sha or external sha of the dual clutch
transmission depending on the clutch engaged. A single-cone
carbon synchronizer is used to synchronize the first, third,
fourth and reverse gear. A double-cone sintered synchronizer
is used for the second gear. Synchronization of the fih to
the sixth gear is carried out with a single-cone sintered synchronizer. The transmission operates without an additional oil
cooling system.
Process
During driving operation, a gear is always engaged in each of
the two sub-transmissions. The gear which is expected to be
engaged next is pre-engaged in the second sub-transmission
by the transmission control system. The clutch for the gear
currently in use is engaged, while that of the gear which is
expected to be used is disengaged. To change gears, clutch 1
(currently engaged) is opened, while clutch 2 is engaged.
Summary
The dual clutch transmission operates without any interruption of tractive power. If necessary, the electronic control
system skips individual gear ranges instead of downshiing
the gears one aer the other. It thus provides the convenience of an automatic transmission combined with the efficiency of a manual transmission.
Transmission
12
Shi mechanism of dual clutch transmission
1 1st gear
2 2nd gear
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Transmission
Technical data
Transmission model700.410700.411
Number of gears (forward/reverse)6/16/1
Maximum transferable torqueNm150150
Weight (without oil charge)kg65.6565.65
Oil chargel
Starting deviceDry dual clutch
UnitM281 E10M281 E09 LA
kg
1.7
1.45
1.7
1.45
54Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 56
Control options
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Selector lever module
Selector lever positions "P", "R", "N" and "D" can be selected
by pressing the selector lever module in the center console
forwards or pulling it backwards.
If the selector lever is pushed to the le in the "D" position,
the transmission switches to "Manual" transmission mode. It
is then possible to upshi and downshi in this position by
pushing the selector lever forwards or pulling it backwards.
twinamic 6-speed dual clutch transmission
S110/1S111/1
Transmission
Steering wheel gearshi
In addition to operating the system using the selector lever,
it is also possible to perform gear shiing via the steering
wheel gearshi buttons on vehicles equipped with the "Multifunction sport steering wheel with shi paddles".
Transmission modes
It is possible to select two different transmission modes
using the Economy mode switch:
• Economy "E" transmission mode: The "Economy" transmission mode is designed for optimal fuel consumption. It
is characterized by early upshiing and a low rpm level.
• Standard "S" transmission mode: The "Standard" transmission mode is designed for active driving. It is characterized by its readiness to downshi and a higher rpm level.
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
View of dual clutch
P27.60-3826-00
55
Page 57
Axles and suspension
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Chassis
Front axle
As in the predecessor model, the front axle of the new smart
is a classic MacPherson strut design.
The main advantages of this front axle design include:
• Small space requirement
• Low unsprung masses
• Large support base
• Low forces
Wheel control on each wheel is performed by a transverse
control arm below wheel center, a suspension strut and a tie
rod.
The focus during the redevelopment of the front axle of model series 453 was on achieving a high level of driving safety,
a high level of manoeuvrability and improved ride comfort
compared to the predecessor model series. A high level of
driving safety was achieved through the design of the axle
kinematics and by adjusting the tuning. To improve the ride
comfort, the spring travel both at the front axle and at the
rear axle was increased. The newly developed front axle is
now equipped with a transverse control arm with one guide
bearing and one comfort bearing respectively, which produces greater longitudinal flexibility and improved suspension
response. In order to achieve the desired reduction in the
turning circle, the front axle was designed to allow very large
outside wheel turn angles. This necessitated a suitable integral carrier design, long toothed rack travel distances and
suitable tie rod kinematics.
65
Front axle of smart model 453
1 Transverse control arm with supporting joint
2 Integral carrier
3 Stabilizer bar
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
1
4
P33.00-2144-00
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Axles and suspension
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The front axle integral carrier is larger compared to that of
the predecessor model series and, with its extended support
base, not only holds the guide and comfort bearings of the
transverse control arm, but also the steering. It also serves
as the crash element for the third (lower) plane. The component is designed on a load-dependent basis.
Rear axle
Chassis
Like model series 451, model series 453 is equipped with a
De Dion rear axle directly mounted to the bodyshell with lateral support from cross struts.
The use of this axle design made it possible to develop a rear
axle with competitive features in spite of the relative lack of
available space due to the rear-mounted engine.
The rear axle carrier taken over from the predecessor model
series was integrated into the bodyshell for weight-optimization reasons. The De Dion rear axle of the new smart is thus
mounted directly on the body.
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P35.00-2122-00
5 Coil spring
6 Center bearing
7 Bar link
57
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Axles and suspension
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Chassis
Suspension and damping
The suspension of the new smart consists of twin-tube MacPherson suspension struts on the front axle and twin-tube
shock absorbers with separate springs on the rear axle.
Front axle suspension
The front axle consists of MacPherson suspension struts for
wheel control, consisting of coil springs optimized for transverse forces, auxiliary springs, twin-tube gas-filled shock absorbers and compact support bushings. The support bushing
has a three-path design i.e. force application by the shock
absorber, spring and auxiliary spring are decoupled from
each other. The shock absorber is supported by the inner
elastomer bearing, which is optimally tuned to the response
characteristics of the shock absorber.
The comfort-enhancing polyurethane auxiliary spring features
a progressive characteristic and is supported against the
body through the bearing housing. The force from the coil
spring is transferred through the ball bearing to the body.
View of support bushing
P32.00-2076-00
Noise insulation is achieved by means of a bottom spring
mount made of elastomer. In order to reduce friction in the
seal guide unit of the shock absorber, the coil springs are
geometrically designed as "side load springs", which compensate for the effect of the vertical wheel force on the transverse force in the seal guide unit. This produces optimized
shock absorber response characteristics.
The suspension strut features a clamping bracket for assembly-related reasons, a large spring retainer with spring catching function and a weight-reduced hollow piston rod.
The torsion bar also has a tubular design for weight-related
reasons, with torsion bar mounts vulcanized onto it.
58
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 60
Axles and suspension
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Rear axle suspension
A new feature of the De Dion rear axle are the twin-tube
shock absorbers with separate, barrel-shaped coil springs. Effective noise insulation of the coil springs between the body
and rear axle is achieved by means of two elastomer shims.
The shock absorber is connected to the body by a pin bearing. This has a so cardan bearing which contributes to
a reduction of friction in the shock absorber and thus an
improvement in response characteristics. The location and
ratio of the shock absorbers provides suspension tuning with
a favorable compromise between damping of roll and pitch.
In addition, the deliberate inclination of the shock absorbers
produces longitudinal damping of the axle.
Suspension variants
A standard and a sports suspension are available for the new
smart.
On the standard suspension, longer spring travel distances, a
friction-optimized supporting length and precise lateral force
compensation create the prerequisites for comfortable suspension behavior.
Chassis
The sports suspension available as special equipment features tighter front and rear axle springs and the vehicle level
is lowered by 10mm at the front and rear axle compared to
the standard suspension.
Sectional view of rear axle damping/springing
P32.00-2077-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
59
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Steering
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Chassis
Steering
The new smart is equipped with a mechanical rack-and-pinion
steering gear as standard, which is located in front of the
wheel center position. An electric steering assist system with
variable steering assistance is available optionally. The newly
developed electric steering assist system of model series
453 is designed as a direct steering system with variable gearing. For minor steering movements, the steering has a more
indirect design which improves straight-ahead running. In
the medium steering angle range encountered during normal
urban driving, the steering ratio increases and the customer
has to move the steering wheel through a reduced angle e.g.
when turning or maneuvering.
The electric steering power assistance system consists of the
rack-and-pinion steering gear, torque sensor, actuator motor
and control unit.
Compared to a conventional hydraulic solution, electric steering force assistance offers the following advantages:
• No hydraulic fluid necessary
• Fuel saving due to greater efficiency
• Improved steering feel
• Optimized assembly process
• Active return improves steering centering
• Diagnosis capability
Repair information
B
When removing/installing the steering gear, all the
fasteners (bolts, nuts and triangular brackets) must be
renewed. A parts kit for this is available in the EPC.
345
Electric power steering of model 453
1 Rack-and-pinion steering gear
2 Tie rod
3 Electrical power steering control unit (N68)
60
122
P46.35-2121-00
4 Electric power steering actuator motor
5 Electric power steering torque sensor
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 62
Brake system
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Brake system
The brake system of model series 453 is designed as a hydraulic dual-circuit brake system with diagonal split.
The brake control system of the brake system comprises the
familiar functions of ABS, ESP, ASR, BAS, GMR and HillStart Assist. The Crosswind Assist function is a new feature
in this segment.
Parking brake with manual operation
As on the predecessor model series, the new smart uses a
lever-type handbrake which acts on the drum brakes of the
rear axle.
Cable slack adjustment can be carried out manually on model series 453 under the handbrake lever trim.
Chassis
P42.00-2194-00
View of front brake system (internally ventilated)
View of rear brake system
View of brake control system
P42.00-2195-00
P42.00-2196-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
61
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Chassis
– This printout will not be recorded by the update service. Status: 06/2014 –
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Steel wheel (codeR83)
P40.10-6733-00
P40.10-6735-00
Light alloy wheel (code R86)
63
Page 65
Chassis
– This printout will not be recorded by the update service. Status: 06/2014 –
Wheels and tires
Light alloy wheel (code R87)
Light alloy wheel (code R91)
P40.10-6736-00
P40.10-6738-00
Light alloy wheel (code R95)
P40.10-6737-00
64
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 66
Overall network
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N3/10
N15/13
A2/13
P00.19-5552-00
Networking
N49
B38/2
A15N24
A1
A40/11
A40/3
A2
N20
N22/1
N112/2
N10/11
N10/10
N30/4
N93/1
N15/5
N2/10
N93/2
X11/4
N68
Chassis CAN
Front end CAN
LIN bus
Overall network of model series C453
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
A89
Telematics CAN
Interior CAN
Drive train CAN
65
Page 67
Networking
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Overall network
warning function with radar
sensor
Front end CAN
A89 Controller unit for distance
N93/2 Distance warning function
gateway
unit
AC operation LIN
N20 Climate control operating
N22/1 Climate control control unit
Drive train CAN
Interior CAN
(M281)
N3/10 ME-SFI [ME] control unit
A1 Instrument cluster
A2 Radio (only valid without
module control unit
N15/5 Electronic selector lever
multifunction steering
wheel and without sound
control unit
N15/13 Dual clutch transmission
amplifier)
A40/11 Multifunction camera
N2/10 Supplemental restraint sys-
tem control unit
N3/10 ME-SFI [ME] control unit
(M281)
N10/10 Center SAM control unit
N10/11 Driver-side SAM control unit
N22/1 Climate control control unit
N30/4 Electronic Stability Program
control unit
N68 Electric power steering con-
Chassis CAN
trol unit
N93/1 Audio gateway control unit
control unit
N30/4 Electronic Stability Program
N49 Steering wheel angle sensor
munications module
N93/2 Distance function gateway
N112/2 Telematics services com-
X11/4 Diagnostic connector
control unit
Navigator
Telematics CAN
A2 Radio
A2/13 Sound system amplifier
A40/3 smart Radio Multimedia
A40/3s1 ON/OFF button
66Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
scroll button
A40/3s2 Home button
A40/3s3 Mute function and menu
N24 Multimedia operating unit
N93/1 Audio gateway control unit
N112/2 Telematics services com-
munications module
Rain and light sensor LIN
B38/2 Rain/light sensor
N10/11 Driver-side SAM control unit
Additional instruments LIN
A1 Instrument cluster
A15 Additional instruments
Page 68
Overall network
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A89
CAN G
LIN B16
N93/2
N10/11N2/10
N10/10
A40/11
N30/4
N112/2N93/1
CAN E
N49
A40/3N24
P00.19-5553-00
Networking
B38/2
N20
LIN B8-3
N68
N22/1
N3/10
A1
N15/13X11/4
A2/13A2
LIN B22
N15/5
CAN B
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
CAN C
CAN A
A15
67
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Networking
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Overall network
warning function with radar
sensor
Front end CAN
A89 Controller unit for distance
N93/2 Distance warning function
gateway
unit
AC operation LIN
N20 Climate control operating
N22/1 Climate control control unit
Drive train CAN
Interior CAN
(M281)
N3/10 ME-SFI [ME] control unit
A1 Instrument cluster
A2 Radio (only valid without
module control unit
N15/5 Electronic selector lever
multifunction steering
wheel and without sound
control unit
N15/13 Dual clutch transmission
amplifier)
A40/11 Multifunction camera
N2/10 Supplemental restraint sys-
tem control unit
N3/10 ME-SFI [ME] control unit
(M281)
N10/10 Center SAM control unit
N10/11 Driver-side SAM control unit
N22/1 Climate control control unit
N30/4 Electronic Stability Program
control unit
N68 Electric power steering con-
Chassis CAN
trol unit
N93/1 Audio gateway control unit
control unit
N30/4 Electronic Stability Program
N49 Steering wheel angle sensor
munications module
N93/2 Distance function gateway
N112/2 Telematics services com-
X11/4 Diagnostic connector
control unit
Navigator
Telematics CAN
A2 Radio
A2/13 Sound system amplifier
A40/3 smart Radio Multimedia
A40/3s1 ON/OFF button
68Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
scroll button
A40/3s2 Home button
A40/3s3 Mute function and menu
N24 Multimedia operating unit
N93/1 Audio gateway control unit
N112/2 Telematics services com-
munications module
Rain and light sensor LIN
B38/2 Rain/light sensor
N10/11 Driver-side SAM control unit
Additional instruments LIN
A1 Instrument cluster
A15 Additional instruments
Page 70
Overall network
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Overview
Along with increasing requirements, e.g. in the areas of
communication, diagnosis or vehicle safety, the data volume
which is exchanged between control units has also increased
proportionally.
However, finite installation space and efforts to lower vehicle weight make conventional data transmission methods
impossible.
This is why the use of bus systems is required.
In the new smart, the vehicle electronics are networked via
the following data bus systems:
• Telematics CAN
• Interior CAN
• Drive train CAN
• Chassis CAN
• Front end CAN
• AC operation LIN
• Rain and light sensor LIN
• Additional instruments LIN
Gateway
Control units with gateway function are linked with two or
more data bus systems. This means that they can send and
receive signals to and from several bus systems.
Control units with gateway function:
• ME-SFI control unit
• Audio gateway control unit
• Electronic Stability Program control unit
• Telematics services communications module
• Distance warning function gateway
Fuses
The maxi and ATO fuses that are accessible for the customer
are located in the following positions in the vehicle:
• Fuse box in front compartment under service flap
• Fuse box in glove compartment
On-board electrical system battery
The 12 V on-board electrical system battery of size H5 is located in front of the passenger compartment under the front
hood on all models.
Networking
The data transfer rate of the CAN bus systems in the new
smart is 500kBd.
Note
b
The procedures for disconnecting the battery are documented in the Workshop Information System (WIS).
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Fuse box in glove compartmentFront compartment fuse box
P54.15-3734-00P54.15-3733-00
69
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Automatic start/stop
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Networking
Automatic start/stop
In order to reduce the fuel consumption and exhaust emissions of the vehicle, the new smart is equipped with an automatic start/stop function as standard (does not apply to
45kW version).
The automatic start/stop function shuts off the engine automatically when the vehicle stops if the relevant conditions
are fulfilled. The engine then restarts automatically to drive
off again.
The driver-side SAM control unit acts as the master control
unit for the automatic start/stop function. It prompts the MESFI [ME] control unit to stop or start the engine depending on
incoming sensor data and the data which it receives from the
center SAM control unit, Electronic Stability Program control
unit, climate control control unit and Supplemental Restraint
System control unit. The output device for start/stop system
messages is the instrument cluster.
Conditions for automatic engine stop
For the automatic start/stop function to automatically shut
off the engine, the driver must brake the vehicle to a standstill, put the vehicle into neutral and release the clutch pedal
or select gear range N. If the following conditions are also
met, the engine is shut off and the ECO start/stop function
"available" indicator lamp lights up on the instrument cluster:
• Engine is at operating temperature
• Driver door is closed and driver seat belt is fastened
• Battery is sufficiently charged
• Temperature in vehicle interior corresponds to setting
• Outside temperature is within a suitable range for the
system
• Automatic start/stop indicator lamp is not on
• Ligate is closed
Conditions for automatic engine start
The engine is started automatically when
• The driver depresses the clutch pedal
• The automatic start/stop function is switched off via the
automatic start/stop button
• The temperature in the vehicle interior is no longer within
the set range
If all of the conditions for an automatic engine start are not
fulfilled, the ECO start/stop function "not available" indicator
lamp lights up.
70Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 72
S40/5
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S40/3
Automatic start/stop
Networking
M14/6s1
M14/7s1
S9/1
S29/5
N10/10
CAN B
N3/10
N15/5
Block diagram of automatic start/stop function
A1 Instrument cluster
A1e62 ECO start/stop function "not available" indicator lamp
A1e63 ECO start/stop function "available" indicator lamp
B11/4 Coolant temperature sensor
B37 Accelerator pedal sensor
B64/1 Brake vacuum sensor
B82 Vehicle interior humidity and temperature sensor
B95 Battery sensor
L6/1 Le front axle rpm sensor
L6/2 Right front axle rpm sensor
L6/3 Le rear axle rpm sensor
L6/4 Right rear axle rpm sensor
M14/6s1 Driver door central locking microswitch
M14/7s1 Ligate central locking microswitch
M21/2b1 Outside temperature sensor
CAN C
N15/13
B11/4B37
S68/1B82
N2/10
N30/4A1
N22/1
N10/11
B64/1
L6/1
L6/2
M21/2b1
L6/3
L6/4
N2/10 Supplemental restraint system control unit
N3/10 ME-SFI [ME] control unit
N10/10 Center SAM control unit
N10/11 Driver-side SAM control unit
N15/5 Electronic selector lever module control unit
N22/1 Climate control control unit
N30/4 Electronic Stability Program control unit
S2/3 Start/stop button
S9/1 Brake light switch
S29/5 Backup light activation/idle recognition switch
S40/3 Clutch pedal switch
S40/5 Start enable clutch pedal switch
S68/1 Le front seat belt buckle switch
CAN B Interior CAN
CAN C Drive train CAN
A1e62
A1e63
B95
S2/3
P15.00-2206-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
71
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Lights
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Exterior lights
Headlamps
The new smart is equipped with H4 halogen headlamps as
standard. The main headlamp is divided into two segments.
The high and low beam are positioned centrally, with the
daytime running light function underneath. The turn signal
indicators are arranged separately outside of the main headlamp, while the optional front fog lamps are housed in the
bumper.
A halogen headlamp, which differs from the basic headlamp
due to a different daytime running light design, is available
as special equipment in combination with certain equipment
packages.
This is a particularly eye-catching feature because a honeycomb structure in the headlamp is projected using white
LEDs when the vehicle is opened and closed.
The high beam and low beam functions are still positioned
centrally. The turn signal indicators and front fog lamps are
also in the same position as on the basic version.
Headlamp range adjustment
The new smart is equipped with manually-operated electric
headlamp range adjustment. The headlamps are adjusted
using a selector wheel on the le of the instrument panel
next to the steering wheel.
Front fog lamps
The optional front fog lamps are located in the bumper under
the headlamps.
Front lamp unit (standard)
P82.10-7637-00
P82.10-7638-00
Front lamp unit (SA)
72
Front lights
P00.10-5670-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 74
Rear lamps
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On the basic version, the dual color (red/white) rear lamps of
the new smart feature conventional bulb technology. The outer red circular segment performs the taillight and brake light
function (top) and the rear fog lamp function (bottom). The
inner white segment houses the turn signal indicator on the
outside and the reversing lamp on the inside. The reflectors
are positioned outside the rear lamp in the bumper.
Exterior lights
Lights
In combination with the optional headlamps, the rear lamps
are partially equipped with LED technology. Specifically, the
taillights, brake lights and rear fog lamp use LED technology.
The arrangement of the light functions in the outer circular
segment is also different, as the LEDs are distributed all the
way around. The positions of the turn signal indicators and
reversing lamps remain unchanged, while the reflectors are
also still outside the rear lamps in the bumper.
Center high-mounted stop lamp
The center high-mounted brake lamp is equipped with LEDs
and is located in the roof spoiler.
Rear lamp (standard)
P82.10-7639-00
P82.10-7640-00
Rear lamp (SA)
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Rear lights
P00.10-5671-00
73
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Lights
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Interior illumination
General
For the purpose of interior illumination, the new smart is
equipped with a front dome lamp, a rear dome lamp (W453
only), switch and controls illumination/symbol illumination
for the control buttons and instrument illumination.
Customers can choose to add a load compartment lamp
through the equipment lines.
There are several operating and function options for activating the interior lights.
Activation options:
• Press the switch on the front dome lamp or rear dome
lamp
• Open the vehicle doors
• Open the ligate
• Lock or unlock the vehicle via the central locking
Ambiance illumination
Also available as special equipment is indirect illumination of
the vehicle interior, in the form of ambiance illumination.
The ambiance illumination includes:
• Le/right cockpit ambiance illumination
• Center cockpit ambiance illumination
• Le/right front door ambiance illumination
• Le/right footwell lamp
• Glove compartment lamp
Ambiance illumination
74
P82.20-4345-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 76
Active/passive safety
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Safety
In the new smart (C/W453), improved driving and stress-reducing safety is achieved above all by the following systems:
• ABS, BAS, ESP® with Hill-Start Assist (standard)
• Crosswind Assist (standard)
• Flashing adaptive brake lights (standard)
• Cruise control with variable speed limiter (standard)
• Tire pressure monitor (standard)
• Reversing camera (SA)
• Rear parking assist (SA)
• Lane Keeping Assist (SA)
The distance warning function driver assistance system (SA)
forms part of the safety concept which acts preventively
when the system registers signs of danger.
Protective measures for pedestrians
Reducing the severity of accidents is particularly important
for collisions with weaker road users without crumple zones
e.g. pedestrians. In addition to the active measures which
help to avoid accidents or minimize the severity of accidents,
the passive pedestrian protection measures on the new
smart have also been further optimized. For example, to reduce the loads that occur during an impact on the front hood
of the vehicle, the deformation clearances between the front
hood and the components underneath have been optimized.
The deformation properties of the front hood were developed
specifically to meet these requirements. The design of the
front of the vehicle has produced a more favorable, larger
impact area. In combination with the structural design of the
front bumper, this reduces the stress applied if the vehicle
collides with the legs of a pedestrian.
75Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 77
Safety
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Active/passive safety
Restraint systems
Particularly effective protection is achieved through the interaction of the body, seat belts, airbag systems and sensors.
The forward displacement areas for the occupants are designed so that there is a suitable deceleration travel distance
for the occupants in the event of a collision in order to keep
accident stresses as low as possible.
Seat belts
The driver and front passenger seats are each equipped with
a three-point seat belt with belt force limitation and pyrotechnical emergency tensioning retractor as standard. On the
sedan, the outer rear seats are equipped with a three-point
seat belt with seat belt retractor with tensioning and belt
force limitation. The center seat has a three-point seat belt of
standard design.
In the USA and Canada, the C453 is additionally equipped
with anchor fitting tensioners and two-stage, switchable belt
force limiters for the driver and front passenger.
Child restraint systems
The ISOFIX system incl. Top Tether connection, which allows
certain child seats to be connected to the vehicle, is provided
as standard equipment on the front passenger seat and, on
the sedan, on the rear seats.
Driver/front passenger airbag, kneebag
The smart is equipped with a driver airbag, driving kneebag
and front passenger airbag as standard. The gas generators
for the driver airbag and front passenger airbag operate on a
single-stage basis. The kneebag has a positive influence on
occupant kinematics in the event of a frontal impact and thus
offers the driver additional protection potential in many frontal impact situations.
In the USA and Canada national versions of the smart fortwo
coupé, two-stage driver and front passenger airbags are
used.
The front passenger airbag is equipped with an additional
third pyrotechnical unit in order to adjust the hardness of the
airbag to the particular load case and occupant. A front passenger kneebag is also installed in these national versions.
Sidebags
The sidebags (head/thorax bags) are standard equipment
and are located in the backrest of the driver and front passenger seat. They cover the head and chest of the respective
occupants from the side. When triggered in side collisions,
they can minimize the loads applied to the chest area and reduce the risk of the occupant's head directly hitting the side
window or dangerous objects e.g. power poles, trees or parts
of a colliding vehicle.
The sidebags are triggered on the impact side if the central
electronic unit detects a side crash of a certain severity level.
Furthermore, emergency tensioning retractors are triggered
on both the impact side and the opposite side (depending
on the seat belt status on the USA national version). A reel
tensioner and anchor fitting tensioner on the impact side and
the opposite side are additionally triggered on the USA national version.
On the USA and Canada national versions of the smart
fortwo coupé, thorax/pelvis airbags and window airbags are
used instead of the head/thorax airbags (same integration,
different protection area). The window airbags cover the
whole area between the A and B-pillar at the sides.
76Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 78
Restraint system control unit
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The smart is equipped with an electronic control unit which
triggers restraint systems depending on the expected impact
severity. On the USA and Canada national versions, two upfront sensors are installed additionally on the flexural member at the front end.
In order to better detect side impacts, the central crash sensor is supported by satellite sensors in the area of the B-pillar
base and by pressure sensors in the front doors.
Active/passive safety
Safety
Depending on the seat occupancy detection status and seat
position detected via the seat position switch, the seat occupied recognition system can suppress or adjust airbag triggering on the passenger side on the USA and Canada national
versions. Seat position switches control the switchable belt
force limiters and activation of the ventilation valve by a squib
in the front passenger airbag.
A seat belt buckle switch monitors the belt status at each
position: "engaged" or "not engaged". A visual/acoustic seat
belt reminder warning function is provided for the two front
seats depending on the country. The indicator lamp is located in the instrument cluster. The front passenger seat has a
seat belt reminder mat. The indicator lamp for the rear seats
is located in the overhead control panel.
Airbag system (full equipment)
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P91.60-4767-00
77
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Systems at a glance
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Driving assistance systems
General
The new smart (C/W453) makes use of driver assistance systems which help the driver to drive safely, reduce the stress
on the driver and increase driving comfort.
Several of these systems are not available individually, but
only in combination with or as a component of various equipment packages.
Assistance systems at a glance
• Cruise control with variable speed limiter
• Distance warning function
• Lane Keeping Assist
• Rear parking assist
• Reversing camera
• Tire pressure monitor
• Crosswind Assist
78Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 80
Systems at a glance
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Cruise control with variable speed limiter
smart model series 453 is equipped with a cruise control
function which maintains a preset speed and an additional
variable speed limiter function which helps the driver to
avoid exceeding a speed. The variable speed limiter function
can be adjusted via the multifunction steering wheel. The
cruise control with variable speed limiter is standard equipment on all vehicles irrespective of the engine/transmission
combination.
Excepted from this are the USA and Canada national versions, on which the cruise control function is only available
without variable speed limiter function.
Crosswind Assist
The new smart is equipped with the Crosswind Assist function as standard. This system helps the driver by significantly
weakening any influence on the straightahead running of the
vehicle caused by strong crosswind. The vehicle's deviation
from its intended path and the steering effort required by the
driver are significantly reduced in this situation. The existing
sensors of the ESP® system are used to detect interference
from crosswind. Crosswind Assist is active as of 70 km/h
and takes effect when driving straight ahead or during light
cornering. Crosswind interference is compensated for by a
single-sided brake system intervention initiated by the ESP®
system.
The customer benefit of Crosswind Assist is that the vehicle's
deviation from its intended path and yaw response in heavy
crosswind are reduced and the driver has to countersteer
less.
Driving assistance systems
79Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 81
Driving assistance systems
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Lane Keeping Assist
Lane Keeping Assist
The Lane Keeping Assist (LDW) system uses a camera in the
area of the inside rearview mirror to detect when the vehicle
crosses lane markings and warns the driver when the vehicle
unintentionally leaves the detected lane. The warning takes
the form of an acoustic warning and visual feedback (tell-tale)
on the instrument cluster. Lane Keeping Assist (LDW) is active at vehicle speeds as of 70 km/h.
The Lane Keeping Assist system is activated using a switch in
the le switch panel next to the steering wheel.
1
View of Lane Keeping Assist camera
80
P30.00-2011-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 82
Tire pressure monitor
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The smart (C/W453) is equipped with directly measuring tire
pressure monitor (TPM) as standard (not for all countries). On
vehicles with tire pressure monitor, a sensor is attached to
the valve on the inside of each wheel. While driving, the sensors transmit radio signals containing information about the
pressure, temperature and rotation direction of the wheels as
well as an individual identification number (to distinguish between sensors). The data which is transmitted via radio signal
is received and evaluated by the SAM control unit via an integrated antenna. The tire pressure monitor issues a warning
using an indicator lamp on the instrument cluster if the air
pressure drops below a certain value. The TPM system has to
be recalibrated when new wheels are installed.
Tire pressure monitor
Driving assistance systems
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
View of wheel sensor with valve
P40.15-2591-00
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Driving assistance systems
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Rear parking assist
Rear parking assist
The new smart is equipped with a rear parking assist system
as special equipment. The rear parking assist system helps
the driver when reversing in tight conditions.
With the aid of ultrasonic signals that are reflected by
obstacles, an electronic control unit computes the distance
between the vehicle and the detected obstacle. The signal
transmitters and receivers are combined in the ultrasonic
sensors and there are three sensors distributed along the
rear bumper. There is a button to switch the function on and
off positioned on the le next to the steering wheel.
If the system detects an object within the monitoring range
behind the vehicle while reversing, this is indicated by an
acoustic warning. The time interval between tones provides
an indication of the distance remaining to the detected object. The acoustic warning varies as the vehicle approaches
from long intervals through to a continuous signal.
When reverse gear is engaged with parking assist active, an
acoustic notification tone sounds.
Location of ultrasonic sensors in bumper
1 Ultrasonic sensors
82
1
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Page 84
Reversing camera
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The smart is equipped with a reversing camera as special
equipment to assist the driver when reversing or reversing
into a parking spot. This is integrated into the licence plate
recess (in the brand logo on the smart forfour). When reverse
gear is engaged, the image from the wide-angle lens reversing camera is displayed on the large touchscreen display
of the smart media system. Dynamic guide lines allow the
particular driving path of the vehicle to be better assessed
depending on the steering angle.
Reversing camera
The camera control system features intelligent shutoff logic
so that the picture is displayed continuously during a maneuver and is not turned off because reverse gear is no longer
engaged.
Driving assistance systems
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Example of camera image with guide linesView of reversing camera on smart coupé
P54.65-5463-00P54.65-5462-00
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Distance warning function
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Driving assistance systems
Distance warning function
The distance warning function driver assistance system provides a static and dynamic distance warning in certain situations. In technical terms, the system consists of a distance
warning controller unit with radar sensor and the distance
warning function gateway.
Static distance warning
A visual warning (warning lamp on instrument cluster) is triggered as soon as a vehicle is detected in front and a certain
time gap between the vehicle in front is dropped below i.e.
the following distance is too short. The static distance warning only operates for moving objects as of a systems vehicle
speed of 30 km/h.
Dynamic distance warning
A dynamic distance warning is triggered if the systems vehicle approaches a detected vehicle in front at high speed
or high acceleration relative to the vehicle in front. In this
case, both a visual and an acoustic warning are issued. The
dynamic distance warning only operates for moving/stopping
objects at a maximum speed of 7 km/h and for stationary
objects up to 70 km/h.
Customer benefits
The aim of the distance warning function is to inform an inattentive driver that there is a risk of a rear-end collision.
Static distance warning
Dynamic distance warning
84
P30.30-2764-00
P30.30-2765-00
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Page 86
Distance warning function
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Driving assistance systems
1
View of system components of front end distance warning function
1 Distance warning function controller unit with radar sensor
P30.30-2766-00
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Climate control
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Comfort
General
Three climate control variants are available for model series
453. The basic system consists of a heater, with a manual air
conditioning system without automatic temperature control
or a fully automatic air conditioning system with controllable
air distribution available optionally. The heater and manual
air conditioning versions are equipped with a dust and pollen
filter, while the automatic air conditioning system features a
combination filter with activated charcoal.
Heater and manual air conditioning system
The standard heater and optional manually controlled air conditioning system are equipped in principle with the same operating unit with rotary actuators. The three controls are used
to adjust the air distribution (le), the fan setting (center)
and the temperature (right). The switch for the rear window
heater is also located in the control panel. In addition, the
manual air conditioning features an A/C switch for switching
the refrigeration system on and off.
The features of the manual air conditioning include:
• Manual adjustment of temperature, blower setting and air
distribution via rotary switches
• Scale indicators on the rotary switches
• Defrost Max and recirculated air selector lever
• A/C button
• Temperature sensor in interior compartment
N23
N23s2N23s12
1
N23s3
Climate control control and operating unit (N23) (manual air conditioning)
1 Air distribution selector wheel
2 Air flow selector wheel
3 Temperature selector wheel
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Page 88
Climate control
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Comfort
B10/6
N23s1
N23s2
N23s3
N23
A9
M4/4
K40
K40k1
K32
CAN B
M21/2
M21/2b1
Climate control block diagram (manual air conditioning (codeI77))
A1 Instrument cluster
A9 Refrigerant compressor
B4/22 Coolant pressure sensor
B10/6 Evaporator temperature sensor
B11/4 Coolant temperature sensor
B17/8 Charge air temperature sensor
K32 Fan solenoid switch, combustion engine cooling system (ICE)
K33 Air conditioning power supply solenoid switch
K40 Combustion engine relay module
K40k1 Refrigerant compressor relay
L6/3 Le rear axle rpm sensor
L6/4 Right rear axle rpm sensor
M2 Blower motor
M2R14
N3/10
B17/8
B4/22
B11/4
K33
N10/10
A1
N30/4
M4/4 Fan
M21/2 Right electrically adjustable and heated outside mirror
M21/2b1 Outside temperature sensor
N3/10 ME-SFI [ME] control unit
N10/10 Center SAM control unit
N23 Climate control control and operating unit
N23s1 Rear window heater button
N23s2 "A/C" button
N23s3 Fresh air/air recirculation mode switch
N30/4 Electronic Stability Program control unit
R14 Blower motor series resistor
CAN B Interior CAN
L6/3
L6/4
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Climate control
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Comfort
Automatic air conditioning
The automatic air conditioning system features an operating
unit with a display for the temperature selection. The usual
controls for the fan setting, air distribution, rear window
heater, A/C on/off etc. are arranged around this display in
the form of control buttons. Illuminated segments around the
edge of the operating unit indicate which functions and settings are active.
The A/C function is activated at the same time when the
AUTO button is pressed. A/C is considered part of the AUTO
function and switches itself on and off automatically depending on the climate conditions in the vehicle. When the A/C
button is pressed, the A/C compressor remains on or off for
the current ignition sequence. If the AUTO-LED only is still
on and A/C is pressed, the AUTO LED goes out even though
automatic control still takes place in the background.
On the automatic air conditioning, the functions of the manual air conditioning system are supplemented by additional
comfort-related features:
• Automatic regulation of manual temperature setting
• Three sensors in addition to interior temperature sensor
for climate control (sun sensor, air humidity sensors)
If AUTO and A/C are active and the customer switches off
the A/C, all of the LEDs go out because the AUTO LED is
linked to the A/C. However, the air flow and air distribution
continue to be regulated automatically as before. Only the
A/C is switched off.
• Adjustment via push buttons and slider
N20s12
N20s4N20s1N20s3
N20
N20s11
Climate control operating unit (N20) (automatic air conditioning)
N20s1 Rear window heater button
N20s2 "A/C" button
N20s3 Air recirculation mode button
N20s4 Defrost button
N20s5 Temperature control
N20s6 "OFF" button
N20s2N20s5N20s7N20s6
N20s8
N20s9
N20s10
P83.30-4975-00
N20s7 "AUTO" button
N20s8 Windshield air distribution button
N20s9 Instrument panel air distribution button
N20s10 Footwell air distribution button
N20s11 Reduce air flow button
N20s12 Increase air flow button
88
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Climate control
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Comfort
N20s1
N20
LIN B8-3
N76/1
N20s2
N20s3
N20s4
N20s5
N20s6
B10/6
N22/1
B82
N20s7
N20s8
N20s9
CAN B
A9
N20s10
N20s11
N20s12
M21/2
M21/2b1
A1N93/1
M4/4
CAN A
Climate control block diagram (Automatic air conditioning (codeI01))
A1 Instrument cluster
A9 Refrigerant compressor
A40/3 smart Radio Multimedia Navigator
B4/22 Coolant pressure sensor
B10/6 Evaporator temperature sensor
B11/4 Coolant temperature sensor
B31 Air quality sensor
B38/2 Rain/light sensor
B82 Vehicle interior humidity and temperature sensor
K32 Fan solenoid switch, combustion engine cooling system (ICE)
K33 Air conditioning power supply solenoid switch
K40 Combustion engine relay module
K40k1 Refrigerant compressor relay
L5 Cranksha position sensor
L6/3 Le rear axle rpm sensor
L6/4 Right rear axle rpm sensor
M2 Blower motor
M2/5 Fresh air/recirculated air flap actuator motor
M2/14 Blend air flap actuator motor
M2/15 Footwell flap actuator motor
M4/4 Fan
M21/2b1 Outside temperature sensor
N3/10 ME-SFI [ME] control unit
M2
M2/5
M2/14
M2/15
N10/10
K40
K40k1
N3/10K32
B4/22
L5
B11/4
A40/3
N10/10 Center SAM control unit
N10/11 Driver-side SAM control unit
N20 Climate control operating unit
N20s1 Rear window heater button
N20s2 "A/C" button
N20s3 Air recirculation mode button
N20s4 Defrost button
N20s5 Temperature control
N20s6 "OFF" button
N20s7 "AUTO" button
N20s8 Windshield air distribution button
N20s9 Instrument panel air distribution button
N20s10 Footwell air distribution button
N20s11 Reduce air flow button
N20s12 Increase air flow button
N22/1 Climate control control unit
N30/4 Electronic Stability Program control unit
N76/1 Blower regulator
N93/1 Audio gateway control unit
CAN A Telematics CAN
CAN B Interior CAN
LIN B8-3 A/C operation LIN
B38/2K33
LIN B16
N10/11
L6/3
N30/4
L6/4
P83.30-4976-00
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89
Page 91
Climate control
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Comfort
Heater and refrigerant circuit
The heat exchanger of the heater circuit has a heat output of
8.7 kW. The output of the flat-tube evaporator is 5.8 kW. The
refrigerant compressor features two-stage control (on/off)
and is integrated into the belt drive by a clutch.
Preventing ice and fogging
When the Defrost Max position is activated, the maximum
air flow is directed against the windshield depending on the
engine temperature to remove any ice and fogging. The air
conditioning is switched on to dry the air depending on the
outside conditions.
The following air vent openings are distributed through the
vehicle:
• Defroster vent along entire length at bottom of windshield
• Fixed side defrosters on side of cockpit
• Swiveling center air vents pointing into the passenger
compartment
• Swiveling round side air vents
• Cross duct with two outlets in the footwell for driver and
front passenger
Air outlets of the interior climate control system
90
P83.10-2901-00
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Page 92
Climate control
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Comfort
Climate control system components, code (I01) Automatic air conditioning
1 Air conditioner housing
2 Condenser
3 Heat exchanger
B10/6 Evaporator temperature sensor
M2 Blower motor
P83.00-2415-00
M2/5 Fresh air/recirculated air flap actuator motor
M2/14 Blend air flap actuator motor
M2/15 Footwell flap actuator motor
N76/1 Blower regulator
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Climate control
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Comfort
Overview of climate control system components
A1 Instrument cluster
A9 Refrigerant compressor
A40/3 smart Radio Multimedia Navigator (only with code(I07))
B4/22 Coolant pressure sensor
B11/4 Coolant temperature sensor
B17/8 Charge air temperature sensor (only with code(I77))
B38/2 Rain/light sensor (only with code(I07))
B82 Vehicle interior humidity and temperature sensor (only with
code(I07))
K32 Fan solenoid switch, combustion engine cooling system (ICE)
K33 Air conditioning power supply solenoid switch
K40 Combustion engine relay module
K40k1 Refrigerant compressor relay
P83.00-2416-00
L5 Cranksha position sensor (only with code(I07))
L6/3 Le rear axle rpm sensor
L6/4 Right rear axle rpm sensor
M4/4 Footwell flap actuator motor
M21/2 Right electrically adjustable and heated outside mirror
M21/2b1 Outside temperature sensor
N3/10 ME-SFI [ME] control unit
N10/10 Center SAM control unit
N10/11 Driver-side SAM control unit (only with code(I07))
N22/1 Climate control control unit (only with code(I07))
N30/4 Electronic Stability Program control unit
N93/1 Audio gateway control unit (only with code(I07))
92
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 94
Power windows
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Power windows
The new smart features power windows as standard
equipment.
Operation of the power windows is carried out using the driver-side power window switch group and the passenger-side
power window switch group. The controls are located in the
armrest of the respective door panel.
The electric power window function is split into manual and
automatic opening and closing.
Manual opening and closing
Pulling or pushing the power window switch as far as the
actuation point opens or closes the window according to the
actuation direction. When the power window switch is released, the window stops in its current position.
Automatic opening and closing
Briefly pulling the power window switch beyond the actuation
point causes the window on the driver or passenger side to
move to the fully open position automatically.
It is closed automatically in the same way by operating the
switch in the other direction.
Comfort
View of power window switch group, driver sideView of power window switch, passenger side
P72.29-2831-00P72.29-2832-00
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Page 95
1M
Power windows
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Comfort
S20/1s1
S20/1s2
S20/1
S21/2
31133
N10/10
M10/3n
M10/3
4455
M14/5s1M14/6s1
Data flow chart of power windows with convenience feature and anti-pinch protection
1 Power window enable signal
2 Power window power supply, actuation
3 Power window, request
4 Power window motor, actuation
5 Central locking microswitch, status
F2k2 Front power window relay
M10/3 Le front power window motor
M10/3n1 Le front power window motor actuation unit
M10/4 Right front power window motor
M10/4n1 Right front power window motor actuation unit
M14/5s1 Front passenger door central locking microswitch
M14/6s1 Driver door central locking microswitch
S20/1 Power window switch group, driver side
S20/1s1 Le front power window switch
S20/1s2 Right front power window switch
S21/2 Power window switch, passenger side
10/4n1
M10/4
F2k2
2
P72.29-2833-00
94
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 96
Seat heater
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Seat heater
As on the predecessor model series, seat heaters are
available for the driver and front passenger seat as special
equipment.
These consist of two heating elements connected in series
on the driver and front passenger seat respectively, which are
installed in the seat bolster and backrest padding.
The seat heaters are activated separately for each side using
the le or right front seat heater switch and are controlled by
the driver/front passenger seat heater control unit integrated
in the front seat surface heater pad.
Pressing the le or right front seat heater switch again deactivates the seat heater.
Automatic shutoff due to overtemperature
If the seat heater control unit detects overtemperature via
the integrated seat heater temperature sensor, it shuts off
the power supply to the heater pads. Once the heater pad
temperature has dropped below the specified value again,
the seat heater control unit switches the power supply back
on. During this process, the LED status indicator in the front
seat heater switch remains switched on.
Automatic time-based shutoff
If the seat heater has been active for 12 minutes, seat heater
control unit automatically switches off the seat heater and
the LED status indicator in the seat heater switch goes out.
Comfort
View of front seat heater switch
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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Page 97
Anti-the alarm system
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Vehicle protection
Anti-the alarm system (ATA)
An anti-the alarm system is available as special equipment
in the new smart.
The customer can choose between two variants of the antithe alarm system.
• Anti-the alarm system (codeV19)
• Anti-the alarm system with interior monitoring and tow-
away protection (code885)
On vehicles with code (V19), the SAM control unit is the master control unit for the anti-the alarm system.
If the vehicle is locked with the transmitter key, the anti-the
alarm system function is activated.
When armed, the SAM control unit monitors the central locking microswitches of the vehicle doors, the ligate and the
ATA switch on the battery. If it detects a status change in the
central locking microswitches or ATA switch on the battery, it
actuates the turn signal lights and the horn.
Vehicles with code (885) are equipped with ultrasonic
sensors in the interior, a sensor for tow-away protection, a
battery-buffered alarm horn and a controller unit.
Tow-away protection
If the position of the vehicle is changed, the ATA inclination
sensor detects this and sends a message to the ATA control
unit, which then triggers the alarm.
Interior protection
Interior protection is activated approx. thirty seconds aer
the vehicle is locked.
Using the ultrasonic sensors mounted centrally on the headliner of the vehicle, the ATA control unit monitors the incoming
and outgoing wave patterns. If anything enters the vehicle without authorization, these change significantly and an alarm
is triggered.
Alarm output
The alarm is output via the battery-buffered alarm horn.
Drive authorization system
The drive authorization system of the new smart represents a
system network of the following components:
• Center SAM control unit (N10/10)
• Transponder coil (L11)
• Vehicle key (A8/1)
• ME-SFI [ME] control unit (N3/10)
• Electronic Stability Program control unit (N30/4)
• Dual clutch transmission control unit (N15/13) (with automatic transmission)
If the key is turned to the position "Ignition ON" in the ignition
lock, data is exchanged between the vehicle key and the
transponder coil. The center SAM control unit receives the
data of the vehicle key from the transponder coil and evaluates it.
At the same time, the center SAM control unit initiates authentication of the Electronic Stability Program control unit
and the dual clutch transmission control unit via CAN bus.
If the authentication of both control units is successful and
the vehicle key is recognized as belonging to the vehicle, the
center SAM control unit sends an enable signal to the engine
control unit. The vehicle can now be started.
96Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
Page 98
Central locking
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Central locking
The central locking system is part of the standard equipment
on model series 453.
As on the predecessor model series, the master control unit
of the central locking is the center SAM control unit.
The central locking system comprises locking and unlocking
of the vehicle doors as well as opening of the trunk lid/
ligate.
The following operating possibilities are available to the
customer:
• Locking and unlocking with the transmitter key
• Manual unlocking with the transmitter key at the driver
door lock
• Locking or unlocking via the instrument panel switch
group
• Remote ligate/trunk opening via transmitter key
• Opening of ligate/trunk lid via handle switch
Automatic functions
If the vehicle exceeds a speed of 7 km/h, the doors are automatically locked by the center SAM control unit. This function
can be activated and deactivated with a locking switch. This
function is deactivated by default.
The vehicle is also automatically locked by the center SAM
control unit if the vehicle doors are not opened two minutes
aer the vehicle is unlocked.
If a crash signal is sent out by the Supplemental Restraint
System control unit in the event of an accident, all of the vehicle doors are unlocked by the central locking.
Vehicle protection
The vehicle doors can always be opened from the inside with
the door handle at a vehicle speed of < 7 km/h, regardless
of the status of the central locking. This unlocks all of the
vehicle doors.
Note
b
The radio signal for unlocking the door is picked up by
an antenna integrated in the SAM control unit. There
is no external antenna for the central locking.
1
P80.20-3876-00
View of ligate of C 453
1 Handle switch
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
1
P80.20-3877-00
View of ligate of W453
1 Handle switch
97
Page 99
Telematics
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General
The following equipment is available for the new smart:
• Radio preinstallation (code C08)
• smart audio system
• smart media system
• Digital radio (DAB) (code C04)
• JBL sound system including removable subwoofer in trunk
Audio and communications
Radio preinstallation (code C08)
A radio preinstallation consisting of speaker cables in the
front doors, two front speakers, 1-DIN slot and FM/AM antenna is available for retrofitting a radio. The vehicle can also
be purchased without a radio preinstallation. It is then no
longer possible to retrofit a radio.
smart audio system
A radio with the following features is installed as special
equipment:
• FM/AM single tuner with the three memory levels of
FM1, FM2 and AM (vehicles equipped with "Digital radio
(DAB)" special equipment additionally feature DR1 and
DR2 memory levels).,
• Two USB connections for USB media
• Media player connection for MP3 and AAC formats
• AUX jack
• Bluetooth® audio streaming
• Telephone connectivity via Bluetooth®
Other functions such as RDS functions and manual updating
of the radio station list with currently available stations are
also included.
The sound settings (bass, treble, fader (S4S only) and balance) can be adjusted. The sound settings are the same for
all audio sources (radio, USB). Separate volume adjustment
for audio and telephone is another feature. The volume can
also be controlled via the multifunction steering wheel.
The information is displayed on a matrix display. The display
is located on the front of the smart audio system in the instrument panel underneath the center air vents.
smart audio system
98
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Page 100
smart media system
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A radio with navigation system and touch operation is available as a further option. The system can be operated quickly
and intuitively using the 7-inch display and the control buttons (hard keys) positioned to the le of it. In combination
with a multifunction steering wheel, operation is also possible
via voice command.
Telematics
The unit has the following features:
• Multimedia Connectivity Hub in center console (1USB,
1SD, 1AUX)
• smart media system with/without DAB digital radio reception (standard or special equipment depending on
country)
• 7-inch touchscreen
• Communications module with integrated SIM card
Audio and communications
smart media system
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
P82.89-1612-00
99
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