ALPS ELECTRIC Co., LTD
CONTENTS
1. PREFACE
2. PASSSIVE ACCSESS ENTRY FUNCTIONALITY
2.1. Door Unlocking
2.2. Engine Start
2.3. Engine Stop
2.4. Door Locking (Push switch)
3. ACTIVE ACCESS ENTRY FUNCTIONALITY
3.1. Door Unlocking
3.2. Engine Start
3.3. Engine Stop
3.4. Door Locking
4. ENTRY SYSTEM OPTIONS
4.1. System Schematic
4.2. Modules
4.2.1. FOB ECU
4.2.2. Entry System ECU
5. SYSTEM CHARACTERISTICS
5.1. Antenna Areas
5.2. Exciter Locations
5.3. Switch Input Locations (Door handle, Touch sensor)
6. ELECTRICAL CHARACTERISTICS
6.1. FOB
6.2. Entry System ECU
FCC WARNING
NOTICE
ALPS ELECTRIC Co., LTD
1.Preface
This document describes the requirements and operation of the Passive Entry System. However, this
document is especially for the Entry system ECU (acronym for Electric Control Unit) and the FOB.
The FOB consists the following functionality for passive access and active access:
• Door unlocking / locking (however, only for request by means of switch operation)
• Trunk unlocking / locking (however, only for request by means of switch operation)
• LF decoding
• RF encoding
• Communication data encryption (cryptograph, anti-collision, rolling code and stuff)
And the entry system ECU consists of the following functionality:
• Door unlocking / locking
• Trunk unlocking / locking
• Engine start (/ stop)
• LF encoding
• RF encoding
• Communication data encryption (cryptograph, anti-collision, rolling code and stuff)
• LF antenna unit control
• Communication with the node ECUs connected to the body bus (e.g. CAN, J1850, customer
dependent bus)
As a further function, both the FOB and the entry system ECU provides the following function:
• Learning mode for programming the manufacturing data and stuff
• Data locking and password protection
• Diagnostic (based upon ISO9141 if required)
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2.Passsive Accsess Entry Functionality
A proximity sensor located on, for example the door handles, mirrors and trunk lid will be used for proximity
check if user is in neighborhood of the vehicle. The switch input will trigger for unlocking and open the
doors and trunk.
Proximity sensor
Figure 1
2.1.Door Unlocking
• User pull / touch the door handle (sensing of door handle switch).
• ECU sends LF-challenge via exterior antenna.
• FOB sends RF-response to the ECU.
• Door unlocking status is engaged.
• Doors are opened.
LF
Figure 2
RF
FOB
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2.2.Engine Start
• User pushes / operate the engine start button / knob.
• ECU sends LF-challenge via interior antenna.
• FOB sends RF-response to the ECU.
• Immobilizer ECU receives and authorize the response.
• Engine controller ECU receives the authorization for engine strat.
• Start the engine.
Figure 3
2.3.Engine Stop
• User pushes / operate the engine stop button / knob.
• ECU communicates with the other ECU for engine start request.
• Engine controller ECU receives the request.
• Stop the engine
RF
LF
Figure 4
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2.4.Door Locking (Push switch)
• User closes the door and pushes the switch (sensing of door locking switch).
• ECU sends LF-challenge via exterior antenna.
• FOB sends RF-response to the ECU.
• Door locking status is engaged.
• Doors are locked.
• (Indicates the door locking status by means of Flasher / Buzzer or stuff)
Figure 5
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3.Active Access Entry Functionality
3.1.Door Unlocking
Same functionality as the current one.
3.2.Engine Start
This function does not effect on the active entry system.
3.3.Engine Stop
This function does not have influencei on the active entry system.
3.4.Door Locking
Same functionality as the current one.
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4.Entry System Options
4.1.System Schematic
4.2.Modules
OTHER ECUS
Body Bus
4.2.1.FOB ECU
315MHz
125kHz
ECUECUECU
Local Bus
RF
Amp
X
LF
Y
Amp
ENTRY SYSTEM ECU
FOB
ASIC
Lock
Unlock
Trunk
Key lock
Emergency key (Transponder)
FOB
125kHz
LF (>2Kbps)
315MHz
RF (>4Kbps)
4.2.2.Entry System ECU
BT handle
FH handle
Trunk lid
Engine start
ENTRY SYSTEM ECU
MCU
RF
Amp
Interior
LF
Exciter
FT BT FH BH
LF
Exciter
LF
Exciter
LF
Exciter
LF
Exciter
315MHz
125kHz
Trunk
LF
Exciter
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5.System Characteristics
5.1.Antenna Areas
Exterior operating range: 0.8m to 1.5m
Interior operating range: Only inside the car
Number of the exterior exciters : max. 5 (min. 2), however, it is depending on the type of the
vehicle.
Number of the interior exciters: 1 (1-Dimmension) or 2 (2-Dimension required)
FT BT
Figure 6
Interior
Exterior
Exterior antenna functionality:
• Unlock / lock doors and trunk.
• Activate / deactivate alarm system.
• Activate immobilizer
Interior antenna functionality:
• Deactivate immobilizer
• Engine start
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5.2.Exciter Locations
Exterior exciters: 2 doors and 1 trunk
Interior exciters: 1 driver’s sheet
2 column / shift lever (X-Y 2-Dimension)
FT BT
Figure 7
Interior
Exterior
Antenna location can be different among of type of the vehicle (e.g. coupe, sedan, mini and stuff).
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5.3.Switch Input Locations (Door handle, Touch sensor)
There are some kind of sensors, for instance the door handle contact switch and touch sensor, will be
used as a triggering for unlocking and open the door.
Switch inputs: 2 doors and 1 trunk
FT BT
Figure 8
Switch inputs can be different among of type of the vehicle (e.g. coupe, sedan, mini and stuff).
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6.Electrical Characteristics
6.1.FOB
• ASK / FSK modulation
• Operating supply voltage 2.1V to 4.0V (3.0V Battery)
• Operating supply current < 7mA
• Stand-by current < 10.0uA
• Operating ambient temperature -20
• Antenna direction 3-Dimension (X, Y, Z), to be considered
• Battery life 2 Years (Low battery indication is considered)
6.2.Entry System ECU
• Operating supply voltage 10.5V to 16.0V
• Operating supply current < 15mA (20mA to 30mA)
• Stand-by current < 4mA
• Operating ambient temperature -40
•
o
C to +60oC
o
C to +85oC
ALPS ELECTRIC Co., LTD
FCC WARNING
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
NOTICE
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
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