Initial Inspection and Diagnostic Overview
Inspection and Verification1. Verify the customer concern.
2. Verify the stop lamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position.
3. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
4. If the cause is not visually evident, connect the diagnostic tool to the data link connector 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.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
^ CAN, SCP, UBP, 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 F. Test F: 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 selftest diagnostics for the SIB.
7. If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
8. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures