Initial Inspection and Diagnostic Overview

Inspection and Verification

NOTE: The anti-lock brake control module must be reconfigured when installing a new part.

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 that the program card is correctly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.
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, CKT915, 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. A
^ SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out 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. ABS Control Module Active Command Index
^ If no DTCs related to the concern are retrieved, proceed to Symptom Chart. Symptom Related Diagnostic Procedures

Warning Lamp Indicators
The anti-lock brake system uses the yellow ABS warning indicator to alert the driver of malfunctions in the ABS.

The yellow ABS warning indicator will come on for numerous reasons. It warns the driver that the ABS has been deactivated due to a symptom that exists in the ABS. Normal power assist braking remains, but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

The diagnostic procedures must be followed step-by-step in order to correct the condition.