Electronic Brake Control Module: Description and Operation

The anti-lock brake control module is located on the hydraulic control unit located in the front of the engine compartment on the LH side of the vehicle.

The anti-lock brake control module operates as follows:
^ If the anti-lock brake control module senses that a wheel is about to lock, the anti-lock brake control module activates the appropriate inlet valve in the brake pressure control valve block, which closes that valve. This prevents any more fluid from entering the affected brake.
^ The anti-lock brake control module then looks at the wheel again. If it is still decelerating, the anti-lock brake control module opens the normally closed outlet valve in the brake pressure control valve block, which decreases the pressure trapped in the line.
^ Impending wheel lock conditions trigger signals from the anti-lock brake control module that open and close the appropriate solenoid valves in the brake pressure control valve block. This results in moderate pulsations in the brake pedal.
^ During normal braking, the brake pedal feel will be identical to a standard brake system.

Most malfunctions which occur to the anti-lock brake system will be stored as a Diagnostic Trouble Code (DTC) in the keep-alive random access memory of the anti-lock brake control module. The DTCs can be retrieved following the on-board diagnostic procedures.