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.
Installation Procedure
- Clean the inside of the back glass with an alcohol wipe.
- Dry the glass thoroughly using a lint free cloth.
- 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.
- 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.
- Remove the protective film from the adhesive backing on the inner antenna coupling.
- Align the inner antenna coupling to the locating marks on the back glass or the exterior coupling.
- 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.
- Ensure there are not any gaps between the couplings (5, 2) and the back glass (4).
- Connect the coaxial cable to the inner coupling.
- Keep the vehicle dry. Allow 6 to 8 hours, at 15°C (60°F), for the adhesive to cure after installation.
Use the Manual With the Right Hardware
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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.
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