Anti-Lock Brake Control Module (ABCM) Operation

The Anti-lock Brake Control Module's (ABCM) primary functions are to, detect wheel locking tendencies, control the brake system while in anti-lock mode, monitor the system for proper operation, and control the display of fault codes while in diagnostic mode.

The ABCM continuously monitors each wheel speed sensor to determine if any wheel is beginning to lock. If a wheel locking tendency is detected, the ABCM will modulate brake fluid pressure in some or all of the hydraulic circuits to prevent wheel lock-up and provide optimum braking.

The ABCM constantly monitors the Anti-lock Brake System (ABS) for proper operation. If the ABCM detects an error, it can disable the anti-lock function and turn on the ANTI-LOCK warning lamp and/or the BRAKE warning lamp.

The ABCM has a self diagnostic capability. Fault Codes may be stored in the ABCM to be displayed for diagnostic purposes. The ABCM can be requested to display these codes, if any are present, by entering ABS diagnostic mode. For further information, see DIAGNOSIS AND TESTING PROCEDURES.

The ABCM is located in the trunk between the rear seat bulkhead and the rear bulkhead trim panel.

The ABCM is a serviceable component.