Inspection and Verification

INSPECTION AND VERIFICATION

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

Visual Inspection Chart:

3. As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting, or incorrectly installed components, module and in-line electrical connectors and pins.
4. If the inspection reveals obvious concern(s) that can be readily identified, repair as required.

5. 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).

6. 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.

7. 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.

- NOTE: The smart junction box (SJB) may also be referred to as a generic electronic module (GEM).

refer to Information Bus (Module Communications Network) to diagnose no response from the smart junction box (SJB) or PCM.

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

9. NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to Computers and Control Systems.

Clear the continuous DTCs and carry out the self-test diagnostics for the SJB or PCM.

10. If the SJB DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) DTC Chart. If the PCM DTCs retrieved are related to the concern, go to Computers and Control Systems. Diagnostic Trouble Code Tests and Associated Procedures

11. If no DTCs related to the concern are retrieved, GO to Symptom Chart - Climate Control Systems or GO to Symptom Chart - Noise, Vibration and Harshness (NVH). Symptom Chart - Climate Control Systems Symptom Chart - Noise, Vibration and Harshness (NVH)