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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 693 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSCOUPLING REPLACEMENT - ANTENNA OUTERINSTALLATION 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. Clean back glass with an alcohol wipe.
  2. Dry the glass thoroughly using a lint free cloth.
  3. Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the back glass in the area where you will install the antenna coupling.

    Follow the Glass Adhesion Promoter instructions on the product label.

    Fig 1: Cleaning Back Glass With Alcohol Wipe
    G01503451Courtesy of GENERAL MOTORS CORP.

    Important: 

    • Align the inner and outer antenna couplings.
    • Do not touch the adhesive backing on the antenna coupling.
  4. Remove the protective film from the adhesive backing on the outer antenna coupling.
  5. Align the outer antenna coupling to the inner antenna coupling.
    Fig 2: Installing Cellular Antenna Outer Coupling
    G01503452Courtesy of GENERAL MOTORS CORP.
  6. Press firmly on all 4 corners and on the center of the antenna outer coupling (5) in order to ensure proper adhesion to the back glass (4).

    Hold pressure on the outer coupling (5) for 10-30 seconds.

  7. Ensure that no gaps occur between the couplings (5, 2) and the back glass (4).
  8. Keep the vehicle dry. Allow 6-8 hours, at 15°C (60°F), for the adhesive to cure after installation.
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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.