Inspection and Verification

Inspection and Verification

1. Verify the customer concern by operating the multi-function switch or ignition switch.
2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart:

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 continuous memory diagnostic trouble codes (DTCs).
8. Clear the continuous DTCs and carry out the self-test diagnostics for the smart junction box (SJB).
9. If the DTCs retrieved are related to the concern, go to Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Chart. Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Chart For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module).
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. 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 the ignition rod
^ Object rubbing against the ignition rod
^ Excessive rubbing of the actuator against the transmission shift socket
^ Binding lock cylinder
^ Shroud rubbing the against 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.