Jeep Cherokee

 Service Manual

Brakes » Antilock brakes » Description and operation
Controller antilock brakes

DESCRIPTION

The CAB is mounted to the HCU and operates the ABS system (Fig. 1) separate from other vehicle electrical circuits.

OPERATION

The CAB voltage source is through the ignition switch in the RUN position. The CAB contains dual microprocessors. A logic block in each microprocessor receives identical sensor signals. These signals are processed and compared simultaneously. The CAB contains a self check program that illuminates the ABS warning light when a system fault is detected.

Faults are stored in a diagnostic program memory and are accessible with the DRB scan tool. ABS faults remain in memory until cleared, or until after the vehicle is started approximately 50 times. Stored faults are not erased if the battery is disconnected.

Fig. 1 Controller Antilock Brakes

1 - HCU
2 - MOTOR
3 - CAB

Antilock brake system

Controller antilock brakes

Hydraulic control unit

Wheel speed sensors and tone wheel

Combination valve

G-switch

Abs warning lamp