Anti-Lock Brakes

Inspection and Verification

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

Visual Inspection Chart:

3. If the concern remains after the inspection, 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 connection of the DLC to the vehicle.
^ check that the ignition switch is in the RUN position.

4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
5. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
^ CAN or ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus.
^ No response/not equipped for the ABS module, GO to Pinpoint Test K. K: No Communication With the Anti-Lock Brake System (ABS) Module
^ System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the ABS module.

6. If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures