GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Vehicle Communication Unit Replacement

Removal Procedure

    Object Number: 650513 Size: SH

    Important: The vehicle communication unit (VCU) has a specific set of unique numbers that tie the module to each vehicle. These numbers, the 10-digit station identification and the 11-digit electronic serial number, are used by the National Cellular Network and OnStar® to identify the specific vehicle. Because these numbers are tied to the vehicle identification number of the vehicle, you must never exchange these parts with those of another vehicle.

  1. Remove the left side trim from the rear compartment.
  2. Remove the spare tire.
  3. Remove the VCU (1) and the bolts, including the electrical connection, from the side trim assembly of the rear compartment.

    4. Object Number: 650516 Size: SH
  4. Slide the long end cap (1) P/N 093666841, over the end of the VCU with the connectors. Slide the short end cap P/N 093666831, over the opposite end.
  5. The old VCU must be returned for core credit.

Installation Procedure

    Object Number: 650513 Size: SH
  1. Record the 11-digit ESN number from the label of the new part.
  2. Install the VCU (1) and the bolts including the electrical connection.
  3. Install the spare tire.
  4. Install the left side trim to the rear compartment.

    5. Important: After replacing the VCU, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair.

  5. Reconfigure the OnStar® system. Refer to OnStar Reconfiguration .