For 1990-2009 cars

### Removal Procedure

Caution: Refer to Approved Equipment for Collision Repair Caution in the Preface section.

1. Disable the SIR system. Refer to SIR Disabling and Enabling .
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to Dimensions - Body .
5. Note the location and remove the sealers and anti-corrosion materials from the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .
6. Locate and drill out all factory welds. Note the number and location of welds for installation of the service part.
7. Remove the damaged rear end panel.

### Installation Procedure

1. Prepare the mating surfaces as necessary. Inspect for proper fit of the service panel.
2. On the new panel, drill 8 mm (5/16 in) plug weld holes as necessary in the locations noted from the original panel.
3. Apply GM-approved Weld-Thru coating or equivalent to all mating surfaces. Refer to Anti-Corrosion Treatment and Repair .
4. Position the service panel. Inspect with 3-dimensional measuring equipment.
5. Plug weld accordingly.
6. Clean and prepare all welded surfaces.
7. Apply the sealers and the anti-corrosion materials to the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .
8. Paint the repair area. Refer to Basecoat/Clearcoat Paint Systems .
9. Install all related panels and components.
10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
11. Enable the SIR system. Refer to SIR Disabling and Enabling .