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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 620 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSCOUPLING REPLACEMENT - ANTENNA INNERINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. 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. Fig 1: Cleaning Inside Of Back Glass
    G01755145Courtesy of GENERAL MOTORS CORP.
  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.
  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. Fig 2: Identifying Inner Antenna Coupling Location
    G01755146Courtesy of GENERAL MOTORS CORP.
  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.
  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).
    Fig 3: Identifying Inner Antenna Coupling
    G01755147Courtesy of GENERAL MOTORS CORP.

    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).
  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 Inner Coupling Coaxial Cable
    G01755148Courtesy of GENERAL MOTORS CORP.
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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.