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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 693 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSONSTAR VEHICLE INTERFACE UNIT (VIU) REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Record the 10-digit STID number from the label on the VIU module.
  2. Position the VIU to the VIU/VCU bracket.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Install the OnStar® mounting bracket screws to the VIU.

    Tighten 

    Tighten the screws to 2 N.m (18 lb in).

    Fig 1: Installing Mounting Screws To Vehicle Interface Unit
    G01503472Courtesy of GENERAL MOTORS CORP.
  4. Connect the GPS antenna cable to the VIU.
    Fig 2: Connecting Global Positioning System Antenna Cable To Vehicle Interface Unit
    G01503473Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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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.