BENDIX BW2920 User Manual
™
SmarT ire Trailer-Link
Tire Pressure Monitoring System
TPMS
Operator’s Manual
This booklet contains important operational and safety
information that benets you and subsequent owners.
Sources of Additional Information about
your SmarTire
®
System by Bendix™ CVS
Consult the vehicle manufacturer’s documentation.
Visit www.bendix.com for free downloads of these
publications from the Literature Center at www.bendix.com.
BW2799 SmarTire Tire Pressure Monitoring System
(TPMS) Operator’s Manual
BW2809 SmarTire TPMS Hand Tool Manual
BW2820 SmarTire Low Frequency (LF) Tool Users Manual
BS2822 SmarTire TPMS Walk Around Card
or
Contact the Bendix Tech Team at
techteam@bendix.com or
1-800-AIR-BRAKE (1-800-247-2725, option 2).
Representatives are available
Mon. - Fri. 8:00 a.m. to 6:00 p.m. ET.
The trademarks used in this document, including Bendix™, are United States
trademarks owned by or licensed to Bendix Commercial Vehicle Systems LLC.
2
About the SmarTire
®
TPMS and SmarTire Trailer-Link™ TPMS 5
Section A - System Overview 7
1 0 System Overview 7
1 1 System Components 7
1 2 Maintenance Tool 7
INDEX
1 3 How Does The SmarTire Trailer-Link
™
TPMS System Work? 8
1 4 Fundamentally, Why Is Temperature Monitoring Important? 9
2 0 Tire Maintenance 12
Section B - System Installation – Tire Sensors 14
3 0 System Installation: Tire Sensors
14
3 1 Sensor Overview 14
3 2 Tools Required 14
3 3 Tire Sensor Installation 15
3 4 Re-mounting Tires After A Sensor Has Been Installed 16
3 5 Removing A Tire That Has A SmarTire
®
Sensor Installed 20
3.6 Tire Sensor Specications 22
Section C: System Installation – Components and Programming 23
4 0 Installing The SmarTire Trailer-Link System 23
4.1 Conguring & Customizing Your SmarTire Trailer-Link System 27
4 2 SmarTire Trailer-Link Axle CIP Adjustment Instructions 28
Section D: SmarTire Trailer-Link Display Options 34
5 0 Trailer Information Display Options 34
5 1 Tractor SmarTire Dash Display
34
5 2 Tractor SmarTire Dash Display Alerts 35
5 3 Trailer-Link To SmarTire Dash Display Link-Up Procedure 35
5 4 Trailer Lamp Blink Codes 35
Section E: Additional Component Details 37
6 0 Trailer-Link System Component Details 37
6.1 Trailer-Link Module Specications 37
Section F: Troubleshooting 41
7 0 Troubleshooting Guide 41
7.1 SmarTire Gauge Display And Trailer-Link Module Q&A 41
7.2 SmarTire System Q&A
46
7 3 Diagnosing A Defective, Missing, Or Misplaced Sensor 46
7 4 SmarTire Hand Tool Troubleshooting 47
Appendix 1: Replacement Parts 48
8 0 Replacement Parts 48
Appendix 2: System Scope Of Use & Alerts 49
9 0 System Scope Of Use And Alerts 49
9 1 System Installation And Usage 49
9 2 Use Of Chemicals 49
9 3 Reacting To Alerts
49
9 4 FCC Notice 50
3
GENERAL SAFETY GUIDELINES
brakes and always block the wheels. Always wear
WARNING! PLEASE READ AND
FOLLOW THESE INSTRUCTIONS
TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
guidelines should be observed AT ALL TIMES:
▲ Park the vehicle on a level surface, apply the parking
personal protection equipment.
▲ Stop the engine and remove the ignition key when
working under or around the vehicle. When working
in the engine com par tment , the engine sho uld be shut
off and the ignition key should be removed. Where
circumstances require that the engine be in operation,
EXT R E ME CAU T I ON sh ou l d be us ed to pre ven t per son a l
injury resulting from contact with moving, rotating,
leaking, heated or electrically-charged components.
▲ Do not attempt to install, remove, disassemble or
assemble a component until you have read, and
thoroughly understand, the recommended procedures.
Use only the proper tools and observe all precautions
pertaining to use of those tools.
▲ If th e wor k is be i ng pe r f o rme d on th e veh i cle ’s ai r br a ke
sy ste m , or an y aux i lia r y pres s uri zed ai r sy ste m s , ma k e
certain to drain the air pressure from all reservoirs
before beginning ANY wor k on th e veh icl e . If th e ve hic l e
is equipped with a Bendix
®
Bendix
DRM™ dryer reservoir module, or a Bendix
®
AD-IS® air dryer system, a
AD-9si® air dryer, be sure to drain the purge reser voir.
▲
Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a manner
that safely removes all electrical power from the vehicle
▲ Never exceed manufacturer’s recommended pressures.
▲ Never connect or disconnect a hose or lin e cont aining
pressure; it may whip. Never remove a component or
plug unless you are certain all system pressure has
been depleted.
▲ Use only genuine Bendix
®
brand replacement parts,
components and kits. Replacement hardware, tubing,
hose, t tings, etc. must be of equivalent size, type
and strength as original equipment and be designed
speci cally for such applications and systems.
▲ Components with stripped threads or damaged par ts
should be replaced rather than repaired. Do not
attempt repairs requiring machining or welding unless
speci cally stated and approved by the vehicle and
component manufacturer.
▲ Pr i or to ret u r nin g the vehi c le to ser vic e, ma ke ce r t ai n all
componen ts and systems are restore d t o their proper
operating condition.
▲ For vehicles with Automatic Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to per forming any vehicle
ma int e na n ce wh ere one or mor e whe e ls on a dri ve ax l e
are lifted off the ground and moving.
▲ The power MUST be temporarily disconnected
from the radar sensor whenever any tests USING A
DYNAMOMETER are conducted on a Bendix
Advanced
™
-equipped vehicle.
▲ You should consult the vehicle manufacturer's
operating and service manuals, and any related
literature, in conjunction with the Guidelines above.
4
®
Wingman
®
.
®
About the SmarTire® Tire Pressure Monitoring
System (TPMS) and SmarTire Trailer-Link™ TPMS
Full SmarTire® TPMS System Overview
Thank you for purchasing the Smar Tire T railer-Link™ Tire Pressure Monitoring
System (TPMS) by Bendix CVS. With SmarTire Trailer -Link TPMS onboard,
your vehicle is equipped w ith a wireless commun ication networ k allowing
seamless integration of wireless tire pressure sensing technology.
The SmarTire Trailer-Link TPMS system is an advanced tire pressure
monitoring system specically designed for commercial vehicle trailers. The
system monitors the pres sure and temperature of eac h trailer tire in or der
to provide real-t ime, tire status i nformat ion and to war n the dri ver of a tire related problem before it becomes dangerous.
Bendix SmarTire System Advantages
● Extends tire life;
● Reduces maintenance costs and time;
● Helps ma xi m ize fuel economy by ensuring that tir e s ar e pr oper ly inated;
● Reduces trailer downtime; and
● Reduces accident risk caused by a tire blowout or tire re.
System Features
● Tempe rature co mpensated al er ts: Know w hen your tires a re at risk no
matter how long you’ve been driving;
● Real-time tra iler tire information displayed on the d ash whenever the
tractor is equipped with the SmarTire TPMS system by Bendix CVS;
● Tire alert s provide instant visual warning of a tire proble m using the
tractor’s dash display or a trailer lamp;
● There are three t ypes of tire aler ts: Pressure Deviati on Aler t, Critic al
Low Pressure Alert, and High Temperature Alert;
● The SmarTire Trailer-Link system data can be sent through the tractor’s
J1939 communication network via the tractor-mounted SmarTire TPMS
for seamless vehicle integration; and
● The trailer tire data can be broadcast on the J1939 communication
network and accessed by telematics devices for back-ofce reporting
of tire data.
5
IMPORTANT NOTICE: PLEASE READ
To prevent sensor dam age, when mounting and dismounting tires th at
have SmarTire
®
TPMS tire sensors, be sure that the maintenance facility
is aware that a tire pressure monitoring system is installed.
If any rims are reloc ated or replaced, be sur e to follow the SmarTire by
Bendix system guidelines to permit the system to re-learn the tire sensor
positions.
To moni to r your trailer tires with your exist in g S m a rTire by Bendix tractor
ECU, you must ensure that the SmarTire Trailer-Link
™
enable function
is set to ON in the SmarTire TPMS system tractor-mounted ECU (par t
number 200.0216).
Additionally, for tractors equipped with ECU part number 200.0184, in order
for the ECU to be able to communicate with the SmarTire T railer-Link ECU,
the ECU rmware MUST BE updated to new rmware. For instructions
on performing this update, please contact your Bendix account manager
or call 1-800 AIR-BRAKE (1-800-247-2725), option 2.
6
Section A - System Overview
1.0 System Overview
1.1 System Components
Maintenance
Hand tool
Tire Sensors
and Cradles
Harnesses
Stainless Steel
Tire Straps
Figure 1 - System Components and Hand Tool
ECU. The Electronic C ontrol Uni t (ECU) of the SmarTire Trailer-Link™ Tire
Pressure Monitoring System receives data transmissions from individual tire
sensors mounted on each trailer wheel. The information received is compared
to user-dened settings. An alert is triggered if the system detects that a tire
is under-inated and/or above expected temperatures.
Where the tractor is equipped with Bendix
and alert s are communicated to a dash displ ay along with the tractor tire
information. A lter nately, where the tractor i s not equipp ed wit h a SmarTire
TPMS system, the Trailer-Link system alerts the dr iver using an optional
trailer-mounted lamp.
Sensors. De signed for the h arsh environment of a c ommercial t ruck tire,
each tire sensor is mounted in a break-away cradle for extra protection.
The tire sensor measur es internal tire pres sure and temperature ever y 12
(twelve) seconds and transmits data every three to ve minutes. If the system
detects a pressure c hange of 3 PSI (0.20 6 bar) or greater, it does not wait
until the next transmission, but will transmit the data immediately.
Sensor Straps. Sensors are mounted to th e surface of the rim usin g a
stainless steel strap, a reliable and universal method of sensor installation.
Harness. Designed to not require a sepa rate power supply, the harness
supplies trailer ABS system power to the SmarTire T railer-Link Tire Pressure
Monitoring System ECU.
1.2 Maintenance Tool
Maintaining tires in the yard is just as important as real-time tire information
for the driver, but many TPMS systems don’t include functi onality to help
yard maintenance personnel. The SmarTire universal hand tool acts like an
“electronic billy- club” allowing maintenance personnel to wirelessly ‘ping’
each tire to measure its pressure and temperature. The SmarTire hand tool
reduces diagnost ic time and helps keep every tir e rolling safely and costeffectively. (For the Maintenance Tool manual, see BW2809.)
7
Trailer-Link ECU
™
SmarTire® TPMS, the data
1.3 How Does The SmarTire TrailerLink™ TPMS System Work?
Full SmarTire® TPMS System Overview
1. The SmarTire Trailer-Link™ ECU creates a wireless bubble around the
trailer, allowing it to sense and transfer trailer tire data to a SmarTire®equipped tractor.
2. Tire sensors mounted on each trailer wheel measure tire pressure and
temperature every twelve (12) seconds and wirelessly transmit tire data
every three to ve minutes.
3. Industrially-designed for the rugged requirements of a commercial trailer
chassis, the SmarTire T railer-Link ECU can monitor up to eight (8) wheel
positions when linked with a tractor with SmarTire TPMS, and more
when applied as a stand alone trailer TPMS. The total number of tires
monitored on both the tractor and trailer cannot exceed twenty.
4. When the tractor connects up to the trailer, the wireless transmissions of
the SmarTire Trailer-Link ECU will link up to the SmarTire tractor ECU.
Once the link up is achieved, the tractor SmarTire display will restart and
add the additional trailer axles to the tractor display . The new axles will
be indicated as trailer axles by showing a “T” in front of the axle number,
e.g. T1, T2, etc.
5. Real-time tire pressure and temperature information is available to the
driver on demand via the SmarTire TPMS tractor display, if equipped.
An easy-to-read and simple-to-use interactive gauge that provides realtime tire status information, the SmarTire display will alert the driver to a
low pressure or high temperature trailer tire condition before it becomes
dangerous.
6. Trailer tires can also be monitored using the system as a stand-alone
application connected to an optional trailer-mounted alert lamp.
7. The SmarTire maintenance hand tool is used to check trailer tire
pressures and temperatures during maintenance inspections. It can
also be connected directly to the SmarTire Trailer-Link ECU to set the
trailer axle Cold Ination Parameters (CIPs) and to congure trailer tire
sensor IDs. The SmarTire maintenance hand tool improves ination
accuracy and reduces diagnostic time in order to keep every tire rolling
cost-effectively. Please refer to Section 3.2 of this manual or BW2809
for detailed information on programming the SmarTire T railer-Link ECU
with the maintenance hand tool.
8
1.4 Fundamentally, Why Is Temperature
Monitoring Important?
The Pressure/Temperature Relationship
Tire manufacturers specify that tire pressures should be checked and adjusted
when a tire is “col d”, but most people may not know why, or even what a
“cold tire” is. The temperature of a tire actually has a signicant impact on
its ination pressure.
According to tire manufacturers, a tire is c onsidered to be “cold” when
its temperature is 65°F (18°C). The ination values provided by vehicle
manufacturers, eet maintenance personnel, or industry-published load
ination tables are called ‘Cold Ination Pressures’ (CIP) because they
represent the correct amount of pressure a tire should be inated to when
it is “cold”. The reason that tires have cold ination pressures set at
specic temperatures is because a tire’s pressure will change relative to its
temperature.
Air naturally expands when h eated and contracts when c ooled. Inside a
contained vesse l such as a tire, this expansion and c ontraction causes a
change in contained air pressure. As a tire heats up, its pressure will naturally
increase and as it cools down, its pressure will naturally decrease.
For example, a tire inated to a CIP of 105 PSI at 65°F will increase in pressure
to 125 PSI at 1 52°F and decrease in pressure to 97 PSI at 32°F. The Smar Tire
Trailer-Link
and pressure as part of normal operation and adapts accordingly to provide
more accurate information while helping to prevent false alerts.
™
tire monitoring system considers these changes in temperature
Tire manufacturers never recommend inating a tire to less than the specied
cold ination pressure. In extreme cases, the beads of a commercial tire
can unseat if its pressure gets too low resulting in a catastrophic tire failure.
Always refer to the vehicle manuf acturer’s recomme ndations for minimum
cold ination pressures.
9
The charts below illustrate the equivalent ination values for a series of Cold
Ination Pressures (CIPs) at various temperatures. The temperature values
represent the temperature of the air contained inside the tire. This temperature
can be estimated for a cold tire using the outside, ambient temperature.
Chart 1
Chart 2
The c h a r ts above are to be u s e d as a gu i d e on l y. Al ways refer to th e
tire and/or vehicle manufacturer’s recommendations for minimum CIPs.
10
Thermal Equilibrium
As a vehicle moves, its tire s naturally heat up due to f rict ion fro m the road
and the exing of its side-walls. Weight, vehicle speed and a tire’s starting
ination pressure all have an impact on how much, and how quickly, heat
is generated.
As the tire generate s heat, its pressure incre ases, causing a reducti on in
side-wall exing. Less side-wall exing and road resistance, combined with
air rushing past the t ire as the vehicle moves, effectively c ounteract the
conditions that cause the tire to heat up. As a result, the temperature increase
tapers off until the tire reaches a point of balance called “thermal equilibrium.”
Tire thermal equilibrium is the point where the heat being generated is
equal to the heat being dis sipated. Tires are design ed with the pr inciples
of temperature and pressu re in mind in order for them to ac hieve thermal
equilibrium. Once a properly inated tire reaches thermal equilibrium, it will
operate at its peak; providi ng the best per forman ce, handling, tire life and
fuel economy.
SmarTire Trailer-Link
™
TPMS Temperature Compensation
Since a tire’s contained air pressure naturally increases as a vehicle moves,
it can be difcult to tell if a hot tire is under-inated. Without some form of
temperature compensation, a hot tire that is under-inated might appear to
be ne because its contained air pressure is at, or above, its Cold Ination
Pressure (CIP).
For example, a tire correctly inated to a CIP of 105 PSI at 65°F will reach
thermal equilibrium when its temperature increases to 152°F and its pressure
increases to 125 PSI. A tire starting at 95 PSI at 65°F (10 PSI under inated)
would have to reach 202°F for it to reach thermal equilibrium (12 5 PSI). The
tire will then be running 50°F hotter than it should be, causing more tire wear
and the potential for a catastrophic failure or tire re.
When checked using a handheld gauge or a tire monitoring system that does
not measure operating temperature, this 10 PSI under-inated tire can appear
to be normal. When equi pped with tire s ensors that m ount inside the tire,
SmarTire Trailer-Link TPMS m easures both tire p ressure and temper ature
in order to provide “Temperature Compensated” pres sure deviation values
and alerts. By measuring the operating temperature of a tire and comparing
it to the CIP value programm ed into the system, the SmarTire Trailer-Link
system will know what a tire’s pressure is suppose d to be in relation to its
operating temperature.
The system is able to warn the driver of an under-inated tire even if t hat
tire’s actual contained air pressure is at — or above — its CIP.
11
The advantages of temperature compensation are even more dramatic when
a tire has a slow leak. A tire t hat is constantly l osing pressure wi ll not be
able to reach ther mal equilibr ium bec ause the c ontained ai r simply ca nnot
expand enough to generate the required pressure, regardless of how hot the
tire becomes. Since the leak is slow, the tire may appear over an extended
period of time to be properly inated when it is actually dangerously underinated and operating well above its temperature capacity.
As air leaks from the tire, increased side-wall exing and rolling resistance
cause the tire’s temperature and pressure to increase. The pressure increase
will soon plateau and beg in to slowly d ecre ase while t he tire’s temperature
continues to increase. Eventually , the tire will become so hot that its structure
will degrade, and then fail in the form of a blow-out and/or tire re.
2.0 Tire Maintenance
Proper tire maintenance is critically impor tant for keeping tires rolling
smoothly. When properly maintained and inated, tires will provide shorter
stopping distances, better vehicle handling in emergency situations, improved
fuel economy and increased tire life.
Maintenance Tips for Long Tire Life:
● Keep tires properly inated at all times.
● Visually inspect tires for injuries prior to each trip.
● Match dual tires for size and keep pressures within 5 PSI (0.344 bar).
● Re-tread tire before wear causes excessive belt damage or fatigue.
12
IMPO R TA NT
READ THESE INSTRUCTIONS PRIOR TO INSTALLATION
™
This SmartTire Trailer-Link
TPMS kit is pre-programmed and ready to use,
subject to your application:
● The sensors have been PRE-ASSIGNED TO WHEEL POSITIONS and
are identied on each unit with a position label (P1, P2, P3, etc.) – install
the sensors as shown in Figure 1.
● Default values have been assigned to each axle for the following
(depending on kit conguration):
◊ Cold Ination Pressure (CIP) – preset to 100 PSI
◊ First Alert Level (FAL) – preset to ±15% from expected (temperature
compensated)
◊ Second Alert Level (SAL) – preset to -20% from CIP
◊ High temperature alert – 185°F (85°C)
Figure 2
13
Section B - System Installation – Tire Sensors
3.0 System Installation: Tire Sensors
3.1 Sensor Overview
The SmarTire® TPMS sensor monitors tire pressure and temperature every
twelve (12) seconds and transmits tire data every three (3) to ve (5) minutes.
If a pressure change of 3 PSI is detected, the sensor will not wait for the next
regular transmission and will transmit tire data immediately. The sensor has
an estimated battery life of ve (5) years.
3.1.1 Break Away Cradle
If proper care is n ot taken when removing or inst alling a tire on a rim th at
has a tire sensor installed, damage can occur. Each SmarTire tire sensor is
conveniently mounted in a break-away cradle so that if damage accidentally
occurs, the inexpensive cradle is broken instead of the sensor.
IMPORTANT NOTICE: PLEASE READ
Please read this section carefully and follow each step precisely to
ensure that you do not damage a sensor and that the sensors are
installed in the correct, pre-programmed locations.
SmarTire tire sensors can be broken when mounting and dismounting
a tire unless specic instructions are followed. If tire work is done
by an unauthorized facility, please let them know that a tire pressure
monitoring system is installed on the vehicle before they remove a tire
from a wheel.
Exercise caution and take precautions when cutting the steel strap
(See Section 3.3 step 2.). Beware of potential sharp edges!
Figure 3
3.2 Tools Required
Installing the Sensors
1. 5/16" or 8 mm hexagon driver
2. Metal cutter
3. Torque wrench
14
4. Tire changing equipment
5. Tire balancing equipment
3.3 Tire Sensor Installation
1. Remove the wheel from the vehicle and then remove the tire.
2. Wrap the strap around the rim in the lowest point of the drop center well
and mark it 1” (2.5 cm) past the worm gear. Cut the strap at the mark.
Excess strap MUST be removed or it will break-off and damage the tire.
3. Slide on the sensor.
1"
Figure 4
4. With the strap and sensor positioned in
the lowest point of the center well, feed
the end of the strap into the worm gear
and pull it tight. Orient the sensor so that
it is positioned at the valve with the worm
gear 4" (10 cm) away from the edge of
the sensor. The sensor MUST always
be installed at the valve in order to know
its approximate location after the tire has
been mounted.
Figure 5
5. Tighten the strap using a 5/16" (8 mm) hexagon driver until the sensor
can not be moved. Reference torque: 35 in-lbs (4 Nm).
CAUTION: Do not over tighten the strap.
6. Indicate the location of the sensor by
applying the supplied rim label to a
clean and dry location on the rim.
Figure 6 - The actual
label design may vary
15
3.4 Re-mounting Tires After A Sensor Has Been Installed
Please read this section carefully and follow each step precisely to ensure you
do not damage the sensor when mounting the tire. If steps are not taken to
avoid the sensor located in the drop center well of the rim, it can be damaged
by tire beads as the tire is mounted.
3.4.1 Internal Tire Sensor Servicing
®
SmarTire
during the mounting or de-mounting process. Each sensor is mounted inside
a break-away cradle that is designed to absorb the impact of damage during
the tire mounting / de-mounting process. If damage occurs, the inexpensive
cradle will break instead of the tire sensor.
If a sensor cradle is da maged, it along with the mounting strap must be
replaced. Carefully remove the tire sensor from the damaged cradle, re-insert
it into a new cradle (Bendix par t number 26 4.00228 N), and then continue
the mounting process.
TPMS tire sensors are designed to be serviceable if damage occurs
16
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