Initial Inspection and Diagnostic Overview

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

Visual Inspection Chart:

NOTE:
- For multi-function switch concerns, see one of the following sections:
- For exterior lighting, see SYMPTOM TROUBLESHOOTING CHART - HEADLAMPS. Symptom Related Diagnostic Procedures
- For wipers and washers, see WIPERS AND WASHERS.

3. If an obvious cause for an observed of reported concern is found, correct the cause (if possible) before proceeding to the next step.

NOTE: Make sure to use the latest scan tool software release.

4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

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

5. 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.
- See PINPOINT TEST 14: NO POWER TO THE SCAN TOOL, Pinpoint Test 14: 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.
- See PINPOINT TEST 1: THE PCM DOES NOT RESPOND TO THE SCAN TOOL OR NO HIGH SPEED CONTROLLER AREA NETWORK (HS-CAN) COMMUNICATION, Pinpoint Test 1: The PCM Does Not Respond to the Scan Tool or No High Speed Controller Area Network (Hs-CAN) Communication to diagnose no response from the. PCM.

7. Carry out the network test.
- If the scan tool responds with no communication from one or more modules, see COMMUNICATIONS NETWORK - TROUBLESHOOTING.
- If the network test passes, retrieve and record the continuous memory diagnostic trouble codes (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) DTC Chart. See DIAGNOSTIC TROUBLE CODE (DTC) CHART - B, C AND U CODES. Engine Control System
10. If no DTCs related to the concern are retrieved, see SYMPTOM TROUBLESHOOTING CHART - POWER WINDOWS. Symptom Related Diagnostic Procedures

Ignition Switch Mechanical Check
Test the mechanical operation of the ignition switch by rotating the lock cylinder through all switch positions. The movement should not stick or bind and should return from the START position back to the RUN position without assistance (spring return). If sticking or binding is encountered, check for the following:
- Burrs on the lock cylinder key
- Insufficient lube on the lock cylinder
- Bent or damaged ignition rod
- Object rubbing against the ignition rod
- Excessive rubbing of the actuator against the transmission shift socket
- Binding lock cylinder
- Shroud rubbing against the lock cylinder
- Burrs or foreign material around the rack and pinion actuator in the lock cylinder housing
- Insufficient lube on the actuator (Do not apply lubricant to the inside of the ignition switch.)
- Binding ignition switch

If the steering wheel lock is engaged with the wheels loaded against a curb, high effort will be necessary to turn the key from lock. Turn the steering wheel to either side of the lock to unload the system.