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, 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
- 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 blue OnStar Call 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 for tips on proper pronunciation
- If the OnStar system responds to all voice commands
- If the OnStar system does not respond to any voice commands
- All OK.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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