Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 GMC Savana, 2013 GMC RV Cutaway, 2013 GMC Cutaway, 2013 Chevrolet RV Cutaway, and 2013 Chevrolet Express. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes.
It is necessary to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

Ignition ON.
Verify that the horn, lights, and the door locks on the vehicle operate properly.
- If an applicable vehicle system does not operate properly
  Refer to Diagnostic System Check - Vehicle .
- If all applicable vehicle systems operate properly
Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button.
- If unable to contact the OnStar® call center
  Refer to Unable to Contact OnStar Call Center
- If able to contact the OnStar Call Center
Verify with the OnStar advisor that all remote functions (door locks, lights, and horn) work.
- If the remote functions do not operate when requested
  Replace the K73 Telematics Communication Interface Control Module
- If the remote functions operate when requested
All OK.