Inspection and Verification

Climate Control System

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, No Power To The Scan Tool, to diagnose no power to 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 to diagnose no response from the 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.

- 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 Information.

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, refer to the Smart Junction Box (SJB) DTC Chart Smart Junction Box (SJB) DTC Chart. If the PCM DTCs retrieved are related to the concern, refer to the PCM DTC Chart. PCM DTC Chart

11. If no DTCs related to the concern are retrieved, GO to Symptom Chart - Climate Control Systems or GO to Symptom Chart - NVH. Symptom Chart - Climate Control Systems Symptom Chart - NVH