Vehicle Communication Unit/Vehicle Interface Unit (ONSTAR®)
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
After replacement of Vehicle Communication Unit (VCU), Vehicle Interface Unit (VIU) or Vehicle Communication Interface Module (VCIM), OnStar® system must be reprogrammed. Call OnStar® call center and follow operator instructions. Be prepared to give operator Electronic Serial Number (ESN) of VCU (2.6)/VCIM (F1) and/or Station ID (STID) number of VIU (2.6)/VCIM (F1).