OnStar - VCU or VIU Reprogramming

ONSTAR MODULE REPROGRAMMING

IMPORTANT: Follow the instruction set for the part that you are replacing. Failure to perform these steps will prevent the OnStar features from functioning and will result in a customer return for repair.

VEHICLE INTERFACE UNIT (VIU)
1. Record the STID number from the label on the new module (10 Digits).
2. 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.
3. 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.
4. 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.

VEHICLE COMMUNICATION UNIT (VCU)
1. Record the ESN number from the label on the new part, (11 digits, no letters).
2. Install the new VCU.
3. After replacement, press and hold the OnStar "End Gall" button (black with white dot); watch for the OnStar status light change from Green to Red to Green.
4. Press the blue OnStar button to connect to OnStar. Tell the advisor that this vehicle has a new VCU and a new ESN to put in the customers account. Follow any additional instructions given by the Advisor.
5. The old VCU must be returned for core credit. Use the address label included in the original box. Failure to return core will result in a debit.