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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 693 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSCOUPLING REPLACEMENT - ANTENNA INNERINSTALLATION 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 the inside of the 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 or (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.

    Important: 

    • The RF connections for the inner antenna coupling should run parallel to the defogger gridline.
    • Align the inner and outer antenna couplings.
    • Do not touch the adhesive backing on the antenna coupling.
    Fig 1: Cleaning Inside Of Back Glass With Alcohol Wipe
    G01503446Courtesy of GENERAL MOTORS CORP.
  4. If the exterior coupling is not installed, mark the inner antenna coupling location (A) 92 mm (3.75 in) and (B) 80 mm (3.25 in) with a grease pencil on the exterior surface of the rear window.
  5. Remove the protective film from the adhesive backing on the inner antenna coupling.
  6. Align the inner antenna coupling to the locating marks on the back glass or the exterior coupling.
    Fig 2: Marking Inner Antenna Coupling Location
    G01503447Courtesy of GENERAL MOTORS CORP.
  7. Press firmly on all 4 corners and on the center of the antenna inner coupling (2) in order to ensure proper adhesion to the back glass (4).

    Hold pressure on the inner coupling (2) for 10-30 seconds.

  8. Ensure there are not any gaps between the couplings (5, 2) and the back glass (4).
    Fig 3: Identifying Couplings & Back Glass
    G01503448Courtesy of GENERAL MOTORS CORP.
  9. Connect the coaxial cable to the inner coupling.
  10. Keep the vehicle dry. Allow 6 to 8 hours, at 15°C (60°F), for the adhesive to cure after installation.
    Fig 4: Connecting Coaxial Cable To Inner Coupling
    G01503449Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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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.