Troubleshooting guide

46
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Controllers with PLC
Since March 1, 2001, all towing vehicles must have an
in-cab trailer ABS Indicator Lamp. Trailers transmit
the status of the trailer ABS over the power line to the
tractor using a Power Line Carrier (PLC) signal (see
right panel). Typically the signal is broadcast by the
trailer ABS ECU. The application of PLC technology for
the heavy vehicle industry is known as “PLC4Trucks.”
The Bendix
®
TABS-6 Advanced MC
The Bendix
®
TABS-6 Advanced MC system provides the
same trailer roll stability (TRSP) technology as Bendix
®
TABS-6 Advanced, along with an adaptable solution for
different axle confi gurations that utilizes two separately
controlled modulators. The TABS-6 Advanced MC
platform allows for distinct control of either side of the
trailer, or it can be confi gured to control independent
axles on a given vehicle. This system is available on
confi gurations ranging from 2S/2M (2 wheel speed
sensors/2 modulators) up to 4S/2M (4 wheel speed
sensors/2 modulators.)
Advanced Trailer ABS Operation and Features
Power Line Without PLC Signal
Power Line With PLC Signal
Ignition
Power
Trailer Chassis
Harness
Bendix
®
TABS- 6
™
Advanced
Multi-
Channel
Trailer
ABS
Module
Bendix
®
SR-5
™
Trailer Spring
Brake Valve
Trailer ABS Pigtail Harness
ABS Indicator Lamp
5-Pin ABS
Connector
Supply
Line
Control Line
Right - “Curb-Side”
Semi-Trailer Tandem Axle Trailer
Left - “Road-Side”
7-Pin (SAE) J560 Connector
Brake Lamp
Power
Ground
“S-D”“S-F”
“S-E” “S-C”
Bendix
®
WS-24
™
Wheel Speed Sensors
Bendix
®
WS-24
™
Wheel Speed Sensors
Air Bellow
(where used)
Load Sensor
(where used)
Troubleshooting: System Schematics
A - Brake Light Power
B - Ignition Power
C - NC
D - Indicator Lamp
E - Ground
Example of Advanced 4S/2M ABS Trailer Schematic