Safe Maintenance Practices; Components; Mounting Configurations; Power Line Carrier (Plc) Communications - BENDIX TABS-6 TRAILER ABS MODULE Manual

SAFE MAINTENANCE PRACTICES

WARnInG! PLEASE REAd And FOLLOW
THESE InSTRUCTIOnS TO AVOId
PERSOnAL InJURY OR dEATH:
when working on or around a vehicle, the following
general precautions should be observed at all times:
. Park the vehicle on a level surface, apply the parking
brakes, and always block the wheels. Always wear
safety glasses.
. Stop the engine and remove ignition key when
working under or around the vehicle. when working
in the engine compartment, the engine should be
shut off and the ignition key should be removed.
where circumstances require that the engine be in
operation, EXTREME CAUTION should be used to
prevent personal injury resulting from contact with
moving, rotating, leaking, heated or electrically
charged components.
3. 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.
4. If the work is being performed on the vehicle's
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure from
all reservoirs before beginning ANY work on the
vehicle. If the vehicle is equipped with an AD-IS
dryer system or a dryer reservoir module, be sure
to drain the purge reservoir.
5. Following the vehicle manufacturer's recommended
procedures, deactivate the electrical system in a
manner that safely removes all electrical power from
the vehicle.
6. Never exceed manufacturer 's recommended
pressures.
7. Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove a
component or plug unless you are certain all system
pressure has been depleted.
8. Use only genuine Bendix
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
0. Prior to returning the vehicle to service, make certain
all components and systems are restored to their
proper operating condition.
. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.

air
®
replacement parts,
®

COMPONENTS

Installations of the TABS-6 Module typically utilize the
following components:
• Bendix WS-24 wheel speed sensors (2 or 4,
® ™
depending on configuration). Each sensor is installed
with a Bendix Sensor Clamping Sleeve. See page 5.
• Bendix BR9235 Pressure Modulator Valves (0, 1, or
® ™
2 depending on configuration). See page 5.
• Trailer-mounted ABS indicator lamp. See page 4.
• Pigtail wiring harness(es) as needed. See page 3.

MOUNTING CONFIGURATIONS

Tank (Nipple) Mount
The TABS-6 modules can be tank-mounted using a
schedule 80 (heavy gauge steel) 3/4" NPT nipple directly
between the trailer supply tank and the module's supply
port. A tank with a reinforced port must be used.
Frame (Chassis) Mount
The TABS-6 module provides through-holes for frame
mounting directly to the trailer frame rail or cross-member.
It is recommended to use two Grade 5 3/8-16 bolts, typical
length 5", torqued to 180-220 in-lbs.
POwER LINE CARRIER (PLC)
COMMUNICATIONS
Since March 1, 2001, all new towed vehicles transmit a
signal over the power line to an in-cab trailer ABS Indicator
Lamp. The signal, using a heavy vehicle industry standard
known as "PLC4Trucks," is typically broadcast by the
trailer ABS ECU over the blue wire (power line) of the J560
connector. See Figures 2 and 3.
TABS-6 modules support PLC communications in accord-
ance with SAE J2497.
Identifying and Measuring the PLC Signal
A TABS-6 module will continuously broadcast PLC
messages that indicate trailer ABS status. At power-up or
during a trailer ABS fault condition, the TABS-6 module will
signal the tractor ABS unit to illuminate the dash-mounted
trailer ABS indicator lamp.
Diagnostic tools are available that detect the presence
of a PLC signal and perform further system diagnostics
directly on the power line. For more information on these
diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
and strength of a PLC signal on the power line. The PLC
signal is an amplitude and frequency modulated signal.
Depending on the load on the power line, the amplitude of
the PLC signal can range from 5.0 mV p-p to 7.0 V p-p.