4-Wheel Anti-Lock Brakes (4WABS)
Inspection and VerificationNOTE: The anti-lock brake control module must be reconfigured when installed new.
1. Verify the customer concern by applying the brakes under different conditions.
2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If the fault is not visually evident, connect the scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
^ check the connections to the vehicle.
^ check the ignition switch position.
^ check that the program card is correctly installed.
4. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
^ CKT914, CKT9: 15 or CKT70 = ALL. ECUS NO RESP/NOT EQUIP, refer to Module Communications Network.
^ NO RESP/NOT EQUIP for anti-lock brake control module, GO to Pinpoint Test A.
^ SYSTEM PASS ID, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the anti-lock brake control module.
6. If the DTCs retrieved are related to the concern, go to Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart.