For 1990-2009 cars

### Removal Procedure

1. Remove the left front sunshade. Refer to Sunshade Replacement in Interior Trim.
2. Remove the garnish molding from the left front windshield. Refer to Windshield Pillar Garnish Molding Replacement in Interior Trim.
3. Remove the instrument panel (IP) trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.
4. Untape the global positioning sensor (GPS) antenna coaxial cable from the Onstar® harness and unroute the harness from the IP.
5. Disconnect the GPS antenna coaxial cable from the vehicle interface unit (VIU).
6. Remove the antenna from the windshield and the roof panel.
7. Clean the old residue from the windshield using a razor blade and isopropyl alcohol.

### Installation Procedure

1. Using a grease pencil, mark the antenna location on the front windshield 2 mm (0.079 in) down from the black-out area and 30 mm (1.18 in) from the side black-out area.
2. Prepare the interior glass using an isopropyl alcohol pad and a clean lint-free cloth.
3. Remove the backing paper from the antenna housing and begin removing the backing on the metallic strip.
4. Install the GPS antenna onto the windshield at the marked location.
5. Pull down gently on the headliner for best adhesion of the GPS antenna and grounding tab.
6. Remove the backing from the metallic strip and adhere the GPS antenna to the roof.
7. Connect the GPS antenna coaxial cable to the VIU.
8. Route the GPS antenna coaxial cable through the IP and up the left front A-pillar.
9. Tape the GPS antenna coaxial cable to the OnStar® harness.
10. Install the IP trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.
11. Install the garnish molding to the left front windshield. Refer to Windshield Pillar Garnish Molding Replacement in Interior Trim.
12. Install the left front sunshade. Refer to Sunshade Replacement in Interior Trim.