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Initial Inspection and Diagnostic Overview

Inspection and Verification
1. Verify the customer concern.

Visual Inspection Chart:




2. Visually inspect the following for obvious signs of electrical damage.
3. Make sure the headlamps operate correctly. Correct any concerns before proceeding to the next step. See HEADLAMPS.
4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

NOTE:
- Make sure the headlamp switch is in the OFF position.
- Make sure the multifunction switch is in the LOW BEAM position.
- Make sure to use the latest scan tool software release.

5. If the cause is not visually evident, connect the IDS or equivalent tester to the data link connector (DLC).

NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

6. If the IDS or equivalent tester does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the IDS or equivalent tester connection to the VCM.
- See PINPOINT TEST 8: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL Pinpoint Test 8: No Module/Network Communication - No Power to the Diagnostic 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.
- See SYMPTOM TROUBLESHOOTING CHART - COMMUNICATIONS NETWORK Communication Network, to diagnose no response from the powertrain control module (PCM).

8. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, See SYMPTOM TROUBLESHOOTING CHART - COMMUNICATIONS NETWORK. Communication Network
- If the network test passes, retrieve and record the continuous memory diagnostic trouble codes (DTCs).

9. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
10. If the DTCs retrieved are related to the concern, see SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX. Diagnostic Trouble Code Descriptions For all other DTCs, see DIAGNOSTIC TROUBLE CODE (DTC) INDEX - B, C AND U CODES.
11. If no DTCs related to the concern are retrieved, see SYMPTOM TROUBLESHOOTING CHART - DAYTIME RUNNING LAMPS (DRL). Symptom Related Diagnostic Procedures
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