Inspection and Verification

INSPECTION AND VERIFICATION

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

VISUAL INSPECTION CHART

Electrical
- Smart junction box (SJB) fuse 15 (10A)
- Bulb(s)
- Circuitry
- Manual temperature control
- Steering wheel controls
- PRNDL display
- Adjustable pedal switch (if equipped)
- Center stack switches (includes the hazard, traction control [if equipped], and parking aid disable switches [if equipped])
- Analog clock (if equipped)
- Decklid release switch (if equipped)
- Auxiliary climate control switches (if equipped)
- Door lock control switches
- Window control switches
- Headlamp switch
- Electronic automatic temperature control (EATC) module and switches
- Audio unit
- SJB
- Instrument cluster

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 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 (Module Communications Network).
- If the network test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
9. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Instrument Cluster and Panel Illumination
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Instrument Cluster and Panel Illumination