Electronic Brake Control Module: Description and Operation

PURPOSE
The anti-lock braking system is controlled by the anti-lock brake control module. Located behind the LH side of the instrument panel, the anti-lock brake control module receives wheel speed readings from each brake anti-lock sensor, and uses this information to compare wheel speeds.

Monitoring And Comparing
By continuously monitoring and comparing the rotational speed of each wheel, the anti-lock brake control module activates the anti-lock braking system only when it senses wheel lockup under severe braking conditions.

Wheel Control
The anti-lock brake control module decides which wheels need to be controlled, and sends the appropriate signals to the hydraulic anti-lock actuator assembly.

Self-Diagnostics
The anti-lock brake control module also has self-diagnostic capabilities and stores Diagnostic Trouble Codes (DTC) in its memory. If a DTC is present in the anti-lock brake module memory, the instrument panel anti-lock brake warning indicator will illuminate when the engine is running. Testing and Inspection

OPERATION

A Fail-Safe Function - is programmed into the anti-lock brake control module that reverts the system to normal braking if a malfunction is detected.

A Self-Diagnosis Function - checks for problems within the ABS. The anti-lock brake control module stores DTC's in its memory to aid the technician in diagnosing problems. The anti-lock brake warning indicator is illuminated while the engine is "RUNNING" to notify the driver of a present failure.