Vehicle Interface Unit: Notes

WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: DO NOT exchange OnStar® Vehicle Interface Unit (VIU), or Vehicle Communication Units (VCU) from other vehicles. Transfer of OnStar® components from other vehicles should not be done. Each OnStar® component has a unique identification number. VIU has a 10-digit specific Station Identification (STID) and VCU has a 11-digit specific Electronic Serial Number (ESN). These identification numbers are used by National Cellular Telephone Network and OnStar® systems, and are stored in General Motors vehicle history files by VIN.