Installation Procedure

2002 Chevrolet Avalanche 2500, RWDSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. If replacing the VCIM, record the 10-digit STID number, and the 11-digit ESN number from the labels on the new module.
  2. Fig 1: OnStar® J-Nuts & Mounting Bracket Bolts
    GM930264Courtesy of GENERAL MOTORS CORP.
  3. Install the OnStar® CIM bracket.
  4. Fig 2: Electrical Connectors, GPS Antenna & Cellular Coax Cable
    GM930271Courtesy of GENERAL MOTORS CORP.
  5. Connect the electrical connectors, the GPS antenna, and the cellular coax cable.
  6. Tilt the CIM inboard and install the CIM.
  7. Fig 3: Mounting Bolts & Repositioning OnStar® Module
    GM931404Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.