Vehicle Interface Unit (VIU)

WARNING: This page is about a different car, the 2002 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Record the STID number from the label on the new module (10 Digits).
After replacement, press the blue OnStar® button twice to connect to OnStar®. Tell the advisor that this vehicle has a new VIU and a new STID number to put in the customers account.
The OnStar® Advisor will reconfigure the vehicle with you. Once the advisor completes configuration, you can end the call. Follow any additional instructions given by the Advisor.
The old VIU must be returned for core credit with the address label included in the original box. Failure to return core will result in a debit.