Anti-Lock Brakes

Inspection and Verification

NOTE: The anti-lock brake control module must be reconfigured upon replacement. Refer to Information Bus.

1. Verify the customer concern by applying the brakes under different conditions.
2. Visually inspect for obvious signs of mechanical and electrical damage.





Visual Inspection Chart

3. If the fault is not visually evident, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic 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 diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool information.
5. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP or ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus.
- No response/not equipped for anti-lock brake control module, Go To Pinpoint Test A. A: No Communication With the Anti-Lock Brake Control Module
- 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 the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. [1][2]Diagnostic Trouble Code Descriptions
7. If no DTCs related to the concern are retrieved. GO to Symptom Chart. Symptom Related Diagnostic Procedures

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

The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off 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.