Anti-Lock Brake Control Module

The anti-lock brake control module is mounted to the hydraulic control unit.

It is an on-board diagnostic, replaceable unit consisting of two microprocessors and the necessary circuitry for their operation. The anti-lock brake control module monitors system operation during normal driving as well as during anti- lock braking and traction control cycling, if equipped.

Anti-lock brake control module operation is as follows:

• Under normal driving conditions, the microprocessor produces short test pulses to the solenoid valves that check the electrical system without any mechanical reaction.
• Impending wheel lock conditions trigger signals from the anti-lock brake control module that open and close the appropriate solenoid valves. 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 faults which occur to the anti-lock brake and the traction control systems will be stored as a diagnostic trouble code (DTC) in the keep-alive memory of the anti-lock brake control module. The DTCs can be retrieved by following the on-board diagnostic procedures.