Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
- 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.
- The vehicle should be located in a quiet area.
- Ignition ON/vehicle in Service Mode, press the blue OnStar Call button.
- Verify that your voice is heard clearly by the OnStar Call center.
- If your voice can not be heard clearly
Refer to OnStar Microphone Malfunction (without IOR) OnStar Microphone Malfunction (IOR)
- Go to next step: If your voice can be heard clearly
- If your voice can not be heard clearly
- Verify that the system responds appropriately to all voice commands by pressing the voice command button and attempting to operate the system using multiple voice commands.
- If the OnStar system does not respond to any voice commands
Replace the K73 Telematics Communication Interface Control Module
- If the OnStar system responds to some, but not all voice commands
Refer to OnStar Description and Operation (UE1 without IOR)OnStar Description and Operation (UE1 with IOR) for tips on proper pronunciation
- Go to next step: If the OnStar system responds to all voice commands
- If the OnStar system does not respond to any voice commands
- All OK.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.