Inspection and Verification

Inspection and Verification
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Visual Inspection Chart:

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

5. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:
^ check the VCM connection to the vehicle.
^ check the scan tool connection to the VCM.
^ refer to Information Bus (Module Communications Network), No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle:
^ verify the ignition key is in the ON position.
^ verify the scan tool operation with a known good vehicle.
^ refer to Information Bus (Module Configuration) to diagnose no response from the powertrain control module (PCM).
7. Carry out the network test.
^ If the scan tool responds with no communication for one or more modules, refer to Information Bus (Multiplex Communications Network).
^ If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
8. Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module.
9. If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Diagnostic Trouble Code Tests and Associated Procedures
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures

Inspection and Verification - Anti-Lock Brake System (ABS) Components

NOTE: If DTCs C1095, C1096, C1148, C1158, C1229 and C1950 are set, simply clearing the DTCs after a repair will not turn the yellow ABS/red brake warning light off.Turn the ignition switch to the OFF position. Turn the ignition switch to the ON position, clear the DTCs and drive the vehicle at least 10 km/h (6.25 mph) for the ABS module to confirm normal operation of the system.After this has completed, the yellow ABS/red brake warning light will turn off.

1. Inspect the wheel speed sensors for looseness and corrosion, clean or install a new sensor(s) as necessary.
2. Inspect the wheel speed sensor wiring for damage, install a new sensor(s) as necessary.
3. Inspect the wheel speed sensor tone rings for damage or missing teeth, install a new tone ring(s) as necessary.
4. Disconnect all ABS connectors and inspect them for corrosion, pushed-out pins and spread terminals. Clean or repair the connectors as necessary.
5. Connect all ABS connectors and verify if the concern is still present.
^ If the concern is still present, GO to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Chart. Diagnostic Trouble Code Tests and Associated Procedures
^ If the concern is not present, clear any DTCs and repeat the ABS module self-test with the brake pedal not applied.