Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. 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/vehicle in Service Mode.
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 .
- Go to next step: 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
- Go to next step: 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
- Go to next step: If the remote functions operate when requested
All OK.