Controller Rear Wheel Anti-Lock Brake: Description

WARNING: This page is about a different car, the 2004 Dodge Dakota and 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

The Controller Anti-lock Brakes (CAB) is a microprocessor which handles testing, monitoring and controlling the ABS brake system operation (Fig 1 ). The CAB functions are:

Perform self-test diagnostics.
Monitor the RWAL brake system for proper operation.
Control the RWAL valve solenoids.

Fig 1: Identifying RWAL CAB
Courtesy of DAIMLERCHRYSLER CORP.

The CAB is mounted on the top of the hydraulic control unit (Fig 2 ). The CAB operates the ABS system and is separate from other vehicle electrical circuits. CAB voltage source is through the ignition switch in the RUN position.

Fig 2: Identifying CAB/HCU

Courtesy of DAIMLERCHRYSLER CORP.

NOTE: If the CAB needs to be replaced, the rear axle type and tire revolutions per mile must be programed into the new CAB. For axle type refer to appropriate AXLE article. For tire revolutions per mile, (Refer to TIRES (2003) or TIRES/WHEELS (2004)). To program the CAB refer CHASSIS DIAGNOSTIC PROCEDURES (2003) or CHASSIS DIAGNOSTIC PROCEDURES (2004).