Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1545 (CELLULAR COMMUNICATION SYSTEM)REPAIR INSTRUCTIONSCOUPLING REPLACEMENT - ANTENNA OUTERINSTALLATION 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 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Clean the outside of the back glass with alcohol wipe.

Fig 1: Cleaning and Drying Glass
Courtesy of GENERAL MOTORS CORP.
Dry the glass thoroughly using a lint free cloth.
IMPORTANT:
- The adhesion promoter must be used to assure adequate bonding of the coupling.
- Mask or protect the surrounding area before applying the adhesion promoter.
Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the back glass in the area the antenna coupling is to be installed.
Follow the Glass Adhesion Promoter instructions on the product label.
IMPORTANT:
- Ensure the inner and outer antenna couplings are aligned.
- Do not touch the adhesive backing on the antenna coupling.
Remove the protective film from the adhesive backing on the outer antenna coupling.
Align the outer antenna coupling to the inner antenna coupling.
Press firmly on all 4 corners and on the center of the antenna outer coupling (2) in order to ensure proper adhesion to the back glass (4). Hold pressure on the outer coupling (5) for 10-30 seconds.

Fig 2: View Of Antenna & Inner Coupling
Courtesy of GENERAL MOTORS CORP.
Ensure that no gaps are present between the couplings (5, 2) and the back glass (4).

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.