Diagnostic Test

CHECK ILLUMINATION CIRCUIT
Is there an overall illumination problem with the vehicle?

Yes
- Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure and perform the appropriate diagnostic procedure.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
No
- Go to step 2
CHECK THE TERM 58D ILLUMINATION CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off to the lock position.
2. Disconnect the Shift Lever Assembly harness connector.
  NOTE: Check connectors - Clean/repair as necessary.
3. Measure the resistance between ground and the Illumination circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the Illumination circuit for a short to ground.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Go to step 3
CHECK THE TERM 58D ILLUMINATION CIRCUIT FOR AN OPEN
1. Disconnect the Instrument Cluster harness connector.
2. Check the resistance of the Illumination circuit between the Shift Lever Assembly harness connector and the Instrument Cluster harness connector.
  Is resistance above 100k ohms?
  
  Yes
  - Repair the Illumination circuit for an open.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Replace the Shift Lever Assembly (Illumination Module) in accordance with the Service Information.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure