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.
OnStar Description and Operation: Notes
The OnStar® system on this vehicle will be one of 2 systems, Generation 4 (Gen. 4) or Generation 5 (Gen. 5). Both systems are diagnosed identically, differing only in the audio prompt responses and output voltage to the microphone. To determine which system this vehicle is equipped with, install a scan tool and access the Module I.D. Information screen. The Gen. 4 and Gen. 5 versions of OnStar® both consist of the following components:
- Vehicle communication interface module (VCIM)
- OnStar® button assembly
- Microphone
- Cellular antenna
- Navigation antenna
This system also interfaces with the factory installed vehicle audio system.
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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.