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

Important: Section in the specified areas only. Sectioning outside of these areas may compromise the structural integrity of the vehicle.

The door frame opening is a unique laser-weld design incorporating multiple metal thicknesses to ensure the structural integrity of the vehicle. The door frame can be replaced at factory seams, but requires the removal of the upper fender rail, the windshield, the roof panel and the quarter panel. Sectioning procedures have been developed as a more cost-effective alternative to complete the replacement. The specific area to be sectioned is determined by the extent of the damage to the vehicle. Refer to Center Pillar Sectioning , Body Lock Pillar Outer Panel Sectioning , Rear Pillar Sectioning , Outer Windshield Frame Pillar Sectioning .

1. Remove all of the related panels and components.
2. Restore as much of the damage as possible to the factory specifications.



3. Note the location and remove the following components as necessary:

•	The sealers

•	The sound deadeners

•	The anti-corrosion materials





Important: Do not damage any of the inner panels or the reinforcements.

4. Cut the panel where sectioning is to be performed.



5. Perform additional sectioning procedures. Refer to the following procedures:

•	Body Lock Pillar Outer Panel Sectioning

•	Rear Pillar Sectioning

•	Center Pillar Sectioning

•	Outer Windshield Frame Pillar Sectioning




6. Locate, and drill out all of the factory welds. Note the number and location of the welds for the installation of the service part.



7. Remove the damaged rocker section.

1. Cut the replacement service part in corresponding locations to fit the remaining original panel. The sectioning joint should be trimmed to allow 1½ times the metal thickness at the sectioning joint.



2. Create a 100 mm (4 in) (a) backing plate from the unused portion of the service part. Trim the backing plate as necessary to fit behind the sectioning joint.



3. Perform additional sectioning procedures. Refer to the following procedures:

•	Center Pillar Sectioning

•	Body Lock Pillar Outer Panel Sectioning

•	Rear Pillar Sectioning

•	Outer Windshield Frame Pillar Sectioning




4. Drill 8 mm (5/16 in) plug weld holes along the sectioning cut on the remaining original part. Locate these holes 25 mm (1 in) from the edge and spaced 40 mm (1.5 in) apart.




Important: In any area with excessive damage, space the plug weld holes every 40 mm (1½ in) apart.

5. Drill 8 mm (5/16 in) plug weld holes in the service part as necessary in the locations noted from the original panel and along the sectioning cut.



6. Prepare all of the mating surfaces as necessary.
7. Apply GM-approved Weld-Thru Coating or equivalent to all mating surfaces. Refer to Anti-Corrosion Treatment and Repair .
8. Fit the backing plate halfway into the sectioning joint, clamp and plug weld to the vehicle.



9. Position and align the rocker section to the adjacent panels using the 3-dimensional measuring equipment.
10. Plug weld accordingly.
11. To create a solid weld with minimum heat distortion, make 25 mm (1 in) stitch welds along the seam with 25 mm (1 in) gaps between them. Then go back and complete the stitch weld.



12. Clean and prepare all of the welded surfaces.
13. Apply the following products as necessary:

•	The sound deadening materials

•	An approved anti-corrosion primer

•	The sealers and refinish as necessary

14. Install all of the related panels and components.