Onstar (R) Cellular Antenna Replacement

REMOVAL PROCEDURE




1. Disconnect the cellular coaxial cable (1) from the coupling box (2).
2. Mark the cellular antenna location with a grease pencil on the exterior surface of the rear window.
3. Remove the coupling box from the interior of the rear window using a small wide-bladed plastic tool in order to release the adhesive.




4. Remove the cellular antenna (1) from the exterior of the rear window using a small wide-bladed plastic tool in order to release the adhesive.

NOTE: If you use a razor blade or other sharp tool in order to remove the adhesives or foreign objects from the inside of the rear window, use the blade carefully. Damage to the grid lines may result.




5. Clean the adhesive residue from the rear window using a razor blade, isopropyl alcohol pad and a clean lint-free cloth.

INSTALLATION PROCEDURE




1. Clean the interior and the exterior surface of the rear window in the cellular antenna mounting location, using an isopropyl alcohol pad, a clean lint-free cloth and allow to air dry.

IMPORTANT:
^ Do not attempt to reinstall the original cellular antenna exterior base or interior coupling using any type of glue, adhesive tapes, etc. Doing so may eliminate the cellular signal through the glass and reduce the maximum performance of the system that includes air bag deployment notification.
^ To obtain maximum adhesion between the new cellular exterior base or interior coupling and the glass surface, the base, coupling and glass must be kept dry and above 15°C (60°F) during the installation and for the 24 hours immediately following the installation. Not keeping the vehicle dry and above the temperature listed for 24 hours may result in the new cellular antenna exterior base or interior coupling coming off.




2. Connect the cellular coaxial cable (1) to the coupling box (2).

IMPORTANT: Do not touch the adhesive backing.

3. Remove the protective backing from the adhesive backing of the coupling box.
4. Install the new coupling box (2) to the marked location on the interior surface of the rear window with the cellular coaxial cable toward the outboard side of the vehicle.
Press the coupling box into place until fully seated for approximately 30 seconds.




5. Clean the exterior surface of the rear window in the cellular antenna mounting location, using an isopropyl alcohol pad and a clean lint-free cloth to remove the grease pencil marks and allow to air dry.

IMPORTANT: Do not touch the adhesive backing.




6. Remove the protective backing from the adhesive backing of the cellular antenna.

IMPORTANT: Failure to exactly follow the location foot print will result in severe phone and vehicle audio performance degradation.

7. Install the cellular antenna base (1) to the foot print location of the coupling box on the exterior surface of the rear window with the cellular antenna mast in a straight up position.

IMPORTANT: Press firmly around the entire periphery of the coupling base in order to ensure the wetting out of the adhesive and to eliminate any air bubbles.

8. Press the cellular antenna coupling base into place until fully seated for approximately 30 seconds.
9. Clean the rear window with glass cleaner GM P/N 1050427 or the equivalent in order to remove any finger prints.