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.
2002 Pontiac Aztek FWDFACTORY OEM SERVICE PROCEDURE
OnStar® Module Reprogramming
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Follow the instruction set for the part that you are replacing. Both the Vehicle Interface Unit (VIU) and Vehicle Communication Unit (VCU) have a specific set of unique numbers that tie the module to the vehicle it resides in. These numbers, the 10 digit Station Identification and 11 digit Electronic Serial Number, are used by the National Cellular Network and OnStar to identify the specific vehicle. Because these numbers are tied to the Vehicle Identification Number of the vehicle, these parts should NOT be exchanged with those of another vehicle. Failure to perform these steps will prevent the OnStar® features from functioning and will result in a customer return for repair.
Factory Service Tools
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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