Vehicle Interface Unit: Notes

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NOTE: Never swap OnStar® Vehicle Integration Units (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.