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:

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 Communications Network) to diagnose no response from the SJB.

7. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Information Bus (Module Communications Network).
- If the network test passes, retrieve and record continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB and dual automatic temperature control (DATC) (if equipped).
9. If the DTCs retrieved are related to the concern, GO to Smart Junction Box (SJB) DTC Chart or HVAC Module - Electronic Automatic Temperature Control (EATC) DTC Chart. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Smart Junction Box (SJB) DTC Chart HVAC Module - Electronic Automatic Temperature Control (EATC) DTC Chart
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures