For 1990-2009 cars

### Removal Procedure

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

1. Disable the supplemental inflatable restraint (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 .

Important: Do not damage any inner panels or reinforcements.

6. Locate and drill out all factory welds. Note the number and location of the welds for installation of the rear rail lower - half.
7. Remove the No. 5 crossbar.
8. Remove the damaged rear rail lower - section

### Installation Procedure

Important: If the location of the original plug weld holes can not be determined, space the plug weld holes every 40 mm (1 1/2 in) apart.

Some panels may have structural weld-thru adhesive. It is necessary to replace the weld-thru adhesive with an additional spot weld between each factory spot weld.
1. Drill out welds between the front and rear panels of the service rail.
2. Drill 8-mm (5/16) plug weld holes in the service part as necessary in the locations noted from the original panel.
3. Prepare all mating surfaces as necessary.
4. Apply GM--approved Weld-Thru Coating or equivalent to all mating surfaces. Refer to Anti-Corrosion Treatment and Repair .
5. Position the rear rail lower - rear section, rear rail upper, and No. 5 crossbar to the vehicle using 3-dimensional measuring equipment. Clamp the parts into place.
6. Plug weld accordingly.
7. Clean and prepare all welded surfaces.
8. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to Anti-Corrosion Treatment and Repair .
9. Paint the repair area. Refer to Basecoat/Clearcoat Paint Systems .
10. Install all related panels and components.
11. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
12. Enable the SIR system. Refer to SIR Disabling and Enabling