Inspection and Verification

INSPECTION AND VERIFICATION

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

VISUAL INSPECTION CHART

Electrical
- Battery junction box (BJB) fuse(s):
- 15 (40A) (no communication with ABS module)
- 16 (30A) (no communication with dual climate control seat module [DCSM])
- 21 (7.5A) (no communication with PCM)
- 30 (15A) (no communication with PCM)
- 49 (10A) (no communication with PCM)
- 50 (10A) (no communication with ABS module)
- 51 (5A) (no communication with headlamp control module [HCM])
- 57 (40A) (no communication with ABS module)
- 59 (30A) (no communication with liftgate/trunk module [LTM])
- 60 (30A) (no communication with driver seat module [DSM])

- Smart junction box (SJB) fuse(s):
- 3 (15A) (no communication with rear entertainment module [RETM], accessory protocol interface module [APIM])
- 5 (10A) (no communication with SJB)
- 11 (10A) (no communication with 4X4 control module)
- 12 (7.5A) (no communication with DSM)
- 13 (5A) (no communication with satellite digital audio receiver system [SDARS] module)
- 14 (10A) (no communication with LTM)
- 15 (10A) (no communication with HVAC module)
- 18 (20A) (no communication with audio digital signal processing [DSP] module)
- 20 (15A) (no power to scan tool)
- 26 (10A) (no communication with instrument cluster [IC])
- 28 (5A) (no communication with audio control module [ACM])
- 29 (5A) (no communication with IC)
- 34 (5A) (no communication with steering angle sensor module [SASM])
- 35 (10A) (no communication with parking aid module [PAM], 4X4 control module)
- 37 (10A) (no communication with HVAC module)
- 38 (20A) (no communication with DSP module)
- 39 (20A) (no communication with ACM)
- 41 (15A) (no communication with ACM)
- 46 (7.5A) (no communication with restraints control module [RCM], occupant classification system module [OCSM])

- Data link connector (DLC)
- Wiring harness
- Wiring, terminals or connectors

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 DLC.

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.
- GO to Pinpoint Test X, to diagnose No Power To The Scan Tool. Test X: No Power To The Scan Tool

5. NOTE: During the network test, the scan tool will first attempt to communicate with the PCM, after establishing communication with the PCM, the scan tool will then attempt to communicate with all other modules on the vehicle.

Carry out the network test.
- If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
- If the network test fails, GO to Symptom Chart to continue diagnosis for the module not communicating. Symptom Related Diagnostic Procedures

6. If the DTCs retrieved are related to the concern, go to DTC Charts. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Module Communications Network

NOTE: Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to the network DTC (U-codes) diagnostics.

7. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures