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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular Communication System >> Repair Instructions >> OnStar Vehicle Communication Unit (VCU) Replacement >> Installation Procedure

Installation Procedure

  1. Record the 11-digit ESN from the label on the new VCU module.
    2. Fig 1: Installing Screw
    GM661523Courtesy of GENERAL MOTORS CORP.
    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.
  2. Install the VCU to the bracket.
  3. Connect the electrical connectors to the VCU.
    4. NOTE: Refer to FASTENER NOTICE .
  4. Install the screw.

    Tighten:  Tighten the screw to 9 N.m (80 lb in).

  5. Install the IP cluster harness.
  6. Install the IP trim panel. Refer to TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER .
    7. 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.
  7. Press and hold the white dot button until the OnStar® status LED turns from green to red, and back again to green.
  8. Install a scan tool. Use the ID information menu to access the new ESN.
  9. 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.
  10. Press the blue OnStar® button to connect to the OnStar® call center
    1. Tell the advisor that this vehicle has received a new VCU.
    2. Ask the advisor to add the new 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.
  11. Return the old VCU for core credit.
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