Installation Procedure

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2007 Isuzu Ascender, 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. 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: Identifying VCIM Electrical Connectors
    GM741627Courtesy of GENERAL MOTORS CORP.
  3. Install the module to the upper bracket ensuring the retaining tab is fully seated.
  4. NOTE: In order to avoid damage to the circuit board, do NOT over-tighten the thumb screws. Using your fingers, apply only a light pressure.
  5. Connect the 2 electrical connectors.

    Tighten:  Tighten the module thumb screw to a maximum of 0.2 N.m (2 lb in).

  6. Fig 2: View Of Communication Interface Module (VCIM) Protective Cover
    GM742196Courtesy of GENERAL MOTORS CORP.
  7. Install the protective cover to the module.
  8. Position the right rear seat bottom to a passenger position.
  9. IMPORTANT: After replacing the vehicle communication interface module, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar® system. This action will cause a DTC to set.
  10. Install the scan tool. Use the special functions menu in order to perform the OnStar® setup procedure for this vehicle.
  11. Move the vehicle to an open area that is away from tall buildings and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes.
  12. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic serial number (ESN) from the new VCIM.
  13. Press the blue OnStar® button to connect to the OnStar® Call Center and perform the following procedure:
    1. Tell the advisor that this vehicle has received a new VCIM.
    2. Ask the advisor to add the new STID and the ESN to update the customer's account.
    3. Follow any additional instructions from the OnStar® advisor.
    4. Ask the advisor to activate the OnStar® Personal Calling feature, if available.
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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.