Installation Procedure

WARNING: This page is about a different car, the 2002 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Record the 11-digit ESN from the label on the new VCU module.
Install the OnStar® VCU to the module bracket assembly.
Ensure the locking tab is secure to the VCU.
Connect the electrical connector.
Connect the cellular coaxial cable to the VCU until fully seated.
Install the module bracket assembly (2) to the seat back panel (3).
NOTE: Refer to FASTENER NOTICE .
Install the nuts (1).
Tighten

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

Fig 1: Identifying Nuts
Courtesy of GENERAL MOTORS CORP.
Install the seat back trim. Refer to COMPARTMENT FRONT TRIM PANEL REPLACEMENT - REAR .
Close the rear compartment lid.
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.
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.