Troubleshooting guide

44
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Trailer ABS Components and Operation
Trailer ABS Components
Typical Trailer ABS components are Bendix Electronic
Control Units (ECUs) such as:
• the Bendix
®
TABS-6
™
standard trailer ABS module;
• the Bendix
®
TABS-6
™
premium trailer ABS module;
• the Bendix
®
TABS-6
™
Advanced (a single channel
ABS trailer system) with roll stability control;
• the Bendix
®
TABS-6
™
Advanced MC (a multi-channel
version of the advanced trailer ABS system) with roll
stability; as well as
• the Bendix
®
MC-30
™
, BR9235
™
and A-18
™
controllers.
Other necessary components:
• Wheel Speed Sensors (see page 38)
• ABS Indicator Lamps. The ABS indicator lamp
(mandated by government regulations) is illuminated
whenever there is an active diagnostic trouble code.
This lamp will remain illuminated (whenever the power
is on) until the condition is cleared. The lamp may
also be used to display diagnostic blink codes when
troubleshooting.
• Harnesses
Plus, for Advanced trailer ABS:
• Lateral Acceleration Sensors
• Brake Delivery Sensors
• Brake Demand Sensors
• Air Suspension Pressure Sensors (or External Spring
Defl ection Sensors)
Trailer ABS Operation
Examples of our trailer ABS systems are:
Bendix
®
TABS- 6
™
controller, a small, scalable,
lightweight system. Our TABS-6 unit delivers the
patented “SelectSmart
™
” control technology as well as
Auxiliary Design Language (ADL), which enables special
functions that would normally require their own ECU.
Features include:
• Normal braking (operates as a standard relay valve);
• Dolly-axle Control Mode (2S/1M), which uses the wheel
behavior monitored by two wheel speed sensors to
modulate the braking of one (or two) axles in an ABS
event;
• Axle Control Mode, which uses a single ABS modulator
to control both sides of a given axle or axles;
• The Side Control Mode, which uses ABS modulators to
control each side of a vehicle separately. The modulator
may control one or more wheels; and
Bendix
®
MC-30
™
Controller
Assy.
Bendix
®
TABS-6
™
Trailer ABS
ABS Lamp
ABS
Harness
The Bendix
®
TABS-6
™
Advanced
Trailer ABS
The Bendix
®
BR9235
™
Advanced
Trailer ABS
Controller
The Bendix
®
TABS-6
™
Advanced MC
Trailer ABS
Bendix
®
A-18
™
Controller Assy.
(Serviced using
Bendix
®
TABS-6
™
Trailer ABS)