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 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:
- Align the inner and outer antenna couplings.
- 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 (5) in order to ensure proper adhesion to the back glass (4). Hold pressure on the outer coupling (5) for 10-30 seconds.
- Ensure that no gaps occur between the couplings (5, 2) and the back glass (4).
- 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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