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Home >> Buick >> 2000 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Cellular Communication System) >> Repair Instructions >> ONSTAR Vehicle Communication Unit (VCU) Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2002 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Record the 11-digit ESN from the label on the new VCU module.
  2. Install the OnStar® VCU (6) into the module bracket assembly.
  3. Connect the electrical connector.
  4. Connect the cellular coaxial cable (2) to the VCU (6) until fully seated.
  5. Ensure the locking tab (1) is secure to the VCU.
  6. Install the forward rear compartment trim panel. Refer to COMPARTMENT TRIM PANEL REPLACEMENT - REAR in Body Rear End.
  7. Press and hold the "end call" button, which is a black button with a white dot. The OnStar® status light will change from green to red to green.
  8. Contact the OnStar® Dealer support line by pressing the blue OnStar® button twice. The 11-digit ESN number will be needed by the OnStar® advisor.
  9. Close the rear compartment lid.
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