Collision Repair Buick LaCrosse I

Scheme 24

Scheme 25

Dimensions - Body (1)

Scheme 26

Dimensions - Body (1)

Scheme 27

Dimensions - Body (1)

Scheme 28

Dimensions - Body (1)

Scheme 29

Dimensions - Body (1)

Scheme 30

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible.
5. Remove the sealers and the anti-corrosion materials from the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the radiator support assembly. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the upper fender rail. Refer to «Rail Replacement - Upper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Using an 8-mm (5/16-in) spot weld remover, locate and drill out the factory welds on the weld flange connecting the wheelhouse to the dash panel.
9. Remove the wheelhouse.

Installation Procedure

1. Position the service wheelhouse to the vehicle using 3-dimensional measuring equipment.
2. Clamp the wheelhouse in place.
3. Using a 7-mm (17/64-in) bit, drill the rivet attachment holes through the service wheelhouse and the dash panel, in the exact locations as noted from the factory wheelhouse.
4. Remove the service wheelhouse.
5. Drill 8-mm (5/16-in) plug weld holes in the service wheelhouse, as necessary, in the remaining locations noted from the original wheelhouse.
6. Prepare the plug weld mating surfaces, as necessary.
7. Apply 3M® Weld-Thru Coating P/N 05913 or equivalent to the plug weld mating surfaces.
8. Prepare the bond mating areas by grinding the body mating and the service part flanges to bare steel. Do NOT damage the corners or thin the metal during the grinding process.
9. Clean the mating surfaces.
10. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to both of the mating surfaces.
11. Using a small acid brush, spread a coat of adhesive to both of the mating surfaces. Cover all of the bare metal to ensure corrosion protection.
12. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to the mating surface of the service wheelhouse.
13. Position the service wheelhouse to the vehicle using 3-dimensional measuring equipment.
14. Clamp the wheelhouse in place.
15. Install the 9 mm (11/32 in) long rivets so that the rivet head contacts the passenger compartment side of the dash.
16. Remove the excess adhesive from the wheelhouse area.
17. Plug weld the remaining holes accordingly.
18. Clean and prepare all of the welded surfaces.
19. Install the radiator support assembly. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
20. Install the upper fender rail. Refer to «Rail Replacement - Upper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
21. Apply the sealers and anti-corrosion materials to the repaired area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
22. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
23. Install all of the related panels and components.
24. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
25. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

Removal Procedure

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Remove the radiator support. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Locate and drill out all factory welds. Note the number and location of welds for installation of the service part.
8. Remove the damaged apron extension.

1. 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.
2. Prepare all mating surfaces as necessary.
3. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces
4. Position the apron extension.
5. Plug weld accordingly.
6. Replace the radiator support. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
9. Paint and repair the area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
10. Install all related panels and components.
11. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
12. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible.
5. Remove the sealers and the anti-corrosion materials from the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Using an 8-mm (5/16-in) spot weld remover, locate and drill out the factory welds on the weld flange connecting the lower rail side extension to the vehicle structure.
7. Remove the rail side extension.

1. Position the service rail side extension to the vehicle.
2. Clamp the rail in place.
3. Using a 7-mm (17/64-in) bit, drill the rivet attachment holes through the service rail side extension and the dash panel, in the exact locations, as noted from the factory rail side extension.
4. Remove the service rail side extension.
5. Drill 8-mm (5/16-in) plug weld holes in the service rail side extension as necessary, in the remaining locations noted from the original rail side extension.
6. Prepare the plug weld mating surfaces, as necessary.
7. Apply 3M® Weld-Thru Coating P/N 05913 or equivalent to the plug weld mating surfaces.
8. Prepare the bond mating areas by grinding the body mating and the service part flanges to bare steel. Do NOT damage the corners or thin the metal during the grinding process.
9. Clean the mating surfaces.
10. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to both of the mating surfaces.
11. Using a small acid brush, spread a coat of adhesive to both of the mating surfaces. Cover all of the bare metal to ensure corrosion protection.
12. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to the mating surface of the service rail side extension.
13. Position the service rail side extension to the vehicle using 3-dimensional measuring equipment.
14. Clamp the service rail side extension in place.
15. Install the 9-mm (11/32-in) long rivets so that the rivet head contacts the passenger compartment side of the dash.
16. Install the 14-mm (17/32-in) long rivets so that the rivet head contacts the passenger compartment side of the dash.
17. Remove the excess adhesive from the service rail side extension area.
18. Plug weld the remaining holes accordingly.
19. Clean and prepare all of the welded surfaces.
20. Apply the sealers and anti-corrosion materials to the repaired area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
21. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
22. Install all of the related panels and components.
23. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
24. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Restore as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Perform the necessary procedures to gain access to repair. Refer to «Quarter Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. After removing the quarter panel, locate, mark and drill out the welds attaching the reinforcement panel (1) to the outer wheelhouse and the inner quarter.
8. Apply a strip of 25 mm (1 in) masking tape (2) along the horizontal surface of the bend in the wheelhouse (3).
9. Cut along the outboard side of the masking tape to create a flange of length 25 mm (1 in).
10. Remove the damaged section of the wheelhouse (3).

1. Cut the wheelhouse service part (1) along the corner of the bend (2).
2. Remove and discard the unused section of the wheelhouse.
3. On the service part, drill 8 mm (5/16 in) plug weld holes every 40 mm (1/2 in) along the cut.
4. Prepare the mating surfaces.
5. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all of the mating surfaces.
6. Position the service part.
7. Inspect for proper fit and plug weld accordingly (2). Take care not to warp or distort the metal.
8. Repair or replace the outer wheelhouse reinforcement as necessary.
9. Position the reinforcement panel as noted from the original panel location.
10. Plug weld accordingly.
11. Complete the necessary procedures. Refer to «Quarter Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
12. Apply the sealers and the anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
13. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
14. Install all related panels and components.
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
16. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) .

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Restore as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Locate and drill out all factory welds. Note the number and location of welds for installation of the radiator support.
7. Remove the damaged radiator support.

1. Drill 8 mm (5/16 in) plug weld holes as necessary in locations noted from the original panel.
2. Prepare all mating surfaces as necessary.
3. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces
4. Position the lower radiator support.
5. Plug weld accordingly.
6. Clean and prepare all welded surfaces.
7. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
8. Paint and repair the area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
9. Install all related panels and components.
10. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
11. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Locate and drill out all factory welds. Note the number and location of welds for installation of the front upper rail.
7. Remove the damaged front upper rail.

1. Drill 8 mm (5/16 in) plug weld holes as necessary in locations noted from the original front upper rail.
2. Prepare all mating surfaces as necessary.
3. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces
4. Position the upper rail.
5. Plug weld accordingly.
6. Clean and prepare all welded surfaces.
7. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
8. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
9. Install all related panels and components.
10. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
11. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Remove the radiator support. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the front wheelhouse. Refer to «Wheelhouse Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Support the powertrain assembly.
9. Position the cradle away from the rail.
10. Locate the die mark on the inboard and the outboard sides of the front rail.
11. Align a straight edge to the forward edge of the die marks and scribe a line around the rail.
12. Cut and remove the damaged section of the rail.

1. Locate the die mark on the inboard and the outboard sides of the front service rail.
2. Align a straight edge to the rearward edge of the die marks and scribe a line around the rail.
3. Cut the service part along the marked lines. Leave 20 mm (3/4 in) added lengths to the service part for sectioning overlap.
4. Cut and remove approximately 20 mm (3/4 in) of the outboard and downward turned flanges of the service part.
5. Cut 5 mm (3/16 in) along the corners of the service part to create tabs on the 4 sides of the rail.
6. Step the top, bottom and side tabs inward to allow the service part to fit inside the original rail.
7. Welds the tabs together along the corners of the service part (1).
8. Drill 8 mm (5/16 in) plug weld holes in the top, bottom and sides of the original approximately 10 mm (3/8 in) from the sectioning cut.
9. Clean and prepare the mating surfaces as necessary.
10. Position the stepped tabs of the modified service part inside the original rail.
11. Plug weld accordingly.
12. Inspect the measurements frequently to ensure proper fit and alignment.
13. Make 25-mm (1-in) welds along the seam with 25-mm (1-in) gaps between them.
14. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
15. Install the radiator support. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
16. Install the front wheelhouse. Refer to «Wheelhouse Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
17. Clean and prepare all welded surfaces.
18. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
19. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
20. Install all related panels and components.
21. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
22. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible.
5. Remove the sealers and the anti-corrosion materials from the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the front wheelhouse assembly. Refer to «Wheelhouse Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the radiator support assembly. Refer to «Rail Replacement - Upper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Remove the front rail side extension. Refer to «Extension Replacement Front Compartment Side Rail - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
9. Using an 8-mm (5/16-in) spot weld remover, locate and drill out the factory welds on the weld flange connecting the lower rail to the dash panel.
10. From the passenger compartment, locate and drill out the remaining factory weld.
11. Remove the full rail.

1. Drill 8-mm (5/16-in) plug weld holes in the service front lower rail reinforcement in the location noted from the original rail.
2. Prepare the plug weld mating surfaces, as necessary.
3. Apply 3M® Weld-Thru Coating P/N 05913 or equivalent to the plug weld mating surfaces.
4. Position the front lower rail reinforcement.
5. Plug weld the holes accordingly.
6. Position the service rail to the vehicle using 3-dimensional measuring equipment.
7. Clamp the rail in place.
8. Using a 7-mm (17/64-in) bit, drill the rivet attachment holes through the service rail and the dash panel in the exact locations, as noted from the factory rail.
9. Remove the service rail.
10. Prepare the plug weld mating surfaces, as necessary.
11. Apply 3M® Weld-Thru Coating P/N 05913 or equivalent to the plug weld mating surfaces.
12. Prepare the bond mating areas by grinding the body mating and the service part flanges to bare steel. Do NOT damage the corners or thin the metal during the grinding process.
13. Clean the mating surfaces.
14. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to both of the mating surfaces.
15. Using a small acid brush, spread a coat of adhesive to both of the mating surfaces. Cover all of the bare metal to ensure corrosion protection.
16. Apply a 3-6 mm (1/8 to 1/4 in) bead of metal panel bonding adhesive GM P/N 12378567 (Canadian P/N 88901675) or equivalent to the mating surface of the service rail.
17. Position the service rail to the vehicle using 3-dimensional measuring equipment.
18. Clamp the rail in place.
19. Install the 9-mm (11/32-in) long rivets, so that the rivet head contacts the passenger compartment side of the dash.
20. Install the 14-mm (17/32-in) long rivet, so that the rivet head contacts the passenger compartment side of the dash, extending through the front rail and through the rail side extension.
21. Remove the excess adhesive from the rail area.
22. Plug weld the remaining holes, accordingly.
23. Clean and prepare all of the welded surfaces.
24. Install the front wheelhouse assembly. Refer to «Wheelhouse Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
25. Install the front rail side extension. Refer to «Extension Replacement Front Compartment Side Rail - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
26. Install the radiator support assembly. Refer to «Rail Replacement - Upper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
27. Apply the sealers and anti-corrosion materials to the repaired area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
28. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
29. Install all of the related panels and components.
30. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
31. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Sectioning of the inner reinforcement panel can only take place with the outer door frame replacement or sectioning procedures. Section of the outer door frame at the front hinge pillar requires a 40 mm (1 9/16 in) offset from the inner reinforcement sectioning joint. The inner reinforcement can serve as a backing plate for the outer panel sectioning. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the door assembly. Refer to «Door Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) .
7. On the original outer door frame (1) measure down from the large wiring harness hole in the pillar 40 mm (1 9/16 in) and mark a horizontal line.
8. Cut the outer door frame along this line for sectioning.
9. Perform additional sectioning procedures as necessary to remove damaged areas of the door frame opening.
10. Locate, mark and drill out all necessary factory welds. Note the number of the welds for installation of the service panel (2).
11. Remove the damaged section of the door frame opening.

1. On the service part (2), mark a horizontal line to leave a gap of one and one-half times the thickness of the metal at the section joint.
2. Cut the service panel along this line.
3. Drill 8 mm (5/16 in) holes for plug welding in the service part in the locations noted from the original panel.
4. Drill holes for plug welding along the sectioning cut on the service part (2).
5. Locate these holes approximately 13 mm (1/2 in) from the edge of the sectioning cut.
6. Use the inner reinforcement (3) as a backing plate.
7. Apply 3M® Weld-Thru Coating P/N 05916 or equivalent to all mating surfaces.
8. Stitch weld along the entire joint (3).
9. Make 25 mm (1 in) gaps between.
10. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
11. Complete all other welds and sectioning procedures as necessary.
12. Clean and prepare all welded surfaces.
13. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
14. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
15. Install the door assembly. Refer to «Door Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) .
16. Install all related panels and components.
17. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
18. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) .

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair)
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Remove the front outer hinge pillar. Refer to «Hinge Pillar Sectioning - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. On the original reinforcement panel (1) measure 120 mm (4 in) down from the large wiring harness hole in the hinge pillar and mark a horizontal line.
8. Cut the inner reinforcement along this line.
9. Locate, mark and drill out all factory welds, as necessary. Note the number and location of welds for installation of the service part.
10. Remove the damaged section of the inner reinforcement (2).

1. Cut and remove 30 mm (1 3/16 in) From the flanges on either side of the remaining section of the original hinge pillar to create a 30-mm (1 3/16-in) flange.
2. Cut 5-mm (3/16-in) wide gaps in the bottom corners.
3. Step the tabs inward to allow the door frame inner reinforcement service section to fit over the original inner reinforcement.
4. Weld the tabs together along the edges (1).
5. On the service part (1) measure 90 mm (3 in) down from the large wiring harness hole in the hinge pillar and mark a horizontal line.
6. Cut the hinge pillar reinforcement along this line.
7. Drill 8 mm (5/16 in) plug weld holes as necessary in the locations noted from the original panel.
8. Drill plug weld holes along the sectioning cut of the service part (2). These holes should be located approximately 15 mm (9/16 in) from the edge of the cut.
9. Prepare mating surfaces.
10. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces.
11. Position the service section (2) over the stepped tab on the original inner reinforcement (1) allowing 30 mm (1 3/16 in) of overlap.
12. Inspect and verify that the door hinge bolt holes are properly located.
13. Plug weld accordingly.
14. Stitch weld along the entire joint with 25-mm (1-in) gaps between the welds.
15. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
16. Install the front outer hinge panel. Refer to «Hinge Pillar Sectioning - Front»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
17. Clean and prepare all welded surfaces.
18. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
19. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
20. Install all related panels and components.
21. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
22. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. On the original outer door frame (2), measure down from the lower edge (1) of the door opening 200 mm (8 in) and mark a horizontal line.
7. Cut the panel where sectioning is to be performed.
8. Perform additional sectioning procedures. Refer to «Door Frame Sectioning - Outer»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
9. Locate and drill out all factory welds. Note the number and location of the welds for installations of the service part.
10. Remove the damaged hinge pillar section.

1. Cut the replacement hinge pillar section in corresponding locations to fit the original panel. The sectioning joint should be trimmed to allow 11/2 times the metal thickness at the sectioning joint.
2. Create a 50-mm (2-in) backing plate (A) from the unused portion of the service part. Trim the backing plate as necessary to fit behind the sectioning joint where there is no reinforcement.
3. Drill 8 mm (5/16 in) plug weld holes along the sectioning cut on the remaining original part. Locate these holes 13 mm (1/2 in) from the edge (A) and spaced 40 mm (11/2 in) apart.
4. 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.
5. Prepare all mating surfaces as necessary.
6. Apply 3M® Weld-Thru Coating P/N 05916 or equivalent to all mating surfaces.
7. Fit the backing plate halfway into the sectioning joint, clamp and plug weld to the vehicle.
8. Position the center pillar.
9. Plug weld accordingly.
10. Stitch the weld sectioning joint.
11. Clean and prepare all welded surfaces.
12. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
13. Paint and repair the area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
14. Install all related panels and components.
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
16. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the radiator support. Refer to «Radiator Support Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Cut the panel in the areas where the sectioning is to take place. Sectioning should be performed in recommended areas only. IMPORTANT: Use care not to cut the inner reinforcement when cutting the outer door frame.
8. Locate, mark and drill out all factory welds. Note the number and location of welds for installation of the service assembly.
9. Remove the damaged outer door frame opening.

1. On service part, mark a horizontal line to leave a gap of one and one-half times the thickness of the metal at the sectioning joint (2).
2. Cut the outer door frame opening service part along this line.
3. Cut a 100 mm (94 in) piece from the unused portion of the service part for a backing plate (1).
4. Remove the flange on each side of the backing plate so that it will fit behind the sectioning joint.
5. Drill 8 mm (5/16 in) holes for plug welding in the service part in the locations noted from the original panel.
6. Drill holes for plug welding along the sectioning cuts on both the service part and the original panel.
7. Locate 3 holes approximately 25 mm (1 in) from the edge of the sectioning cuts.
8. Prepare all mating surfaces as necessary.
9. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces.
10. Position the service part to overlap the exposed 50 mm (2 in) of the backing plate.
11. Inspect for proper fit. Use 3-dimensional measuring equipment.
12. Plug weld accordingly.
13. Stitch weld along the sectioning joint.
14. Make 25-mm (1-in) welds along the seam with 25 mm (1 in) gaps between.
15. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
16. Complete all other welds and sectioning procedures as necessary.
17. Clean and prepare welded surfaces.
18. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
19. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
20. Install all related panels and components.
21. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
22. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
3. Remove the door from the vehicle. Refer to «Door Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
4. Remove the outer door handle. Refer to «Door Handle Replacement - Front Outside»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
5. Remove the outside rear view mirror. Refer to «Mirror Replacement - Power»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
6. Locate and drill out all factory welds. Note the number and location of welds at the upper window frame and mirror locations.
7. Grind the edges of the door outer panel to separate the outer door panel from the door shell.
8. Remove the outer door panel.
9. Remove the sealers and anti-corrosion materials from the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
10. Straighten the edges of the door shell.

1. Using a grinding disk grind the surface of the door shell mating flanges to bare steel.
2. Scuff the opposing mating surfaces of the door outer panel to remove the gloss of the E-Coat.
3. Drill 8 mm (5/16 in) plug weld holes as necessary in the locations noted from the original panel.
4. Clean the mating surfaces.
5. Apply a 3-6 mm (1/8-1/4 in) bead of metal panel bonding adhesive GM P/N 12378566/7 (Canadian P/N 88901674/5) or equivalent, to both of the mating surfaces.
6. Using a small acid brush, spread a coat of adhesive to cover all the bare metal surfaces to ensure corrosion protection.
7. Install the door outer panel to the door shell.
8. Clamp the door outer panel into position as required.
9. Using a hammer re-hem the hem flanges around the door shell. Continue to hammer in stages along the hem flanges.
10. Using lacquer thinner remove the excess adhesive from the door panel area.
11. Install the door to the vehicle. Inspect the door outer panel for proper alignment. Adjust the alignment as required. Refer «Door Replacement - Front»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
12. Metal-inert gas (MIG) weld the door outer panel to the door frame in the locations noted at the upper door frame.
13. Clean and prepare all welded surfaces.
14. Apply Fusor super flexible anti-flutter foam - fast set, Fusor P/N 121/124 or equivalent in 4-5 evenly spaced locations between the door outer panel and the inner safety beam.
15. Apply sealers and anti-corrosion materials to the repair area as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
16. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
17. Install the outer door handle. Refer to «Door Handle Replacement - Front Outside»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
18. Install the outside rear view mirror. Refer to «Mirror Replacement - Power»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
19. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
20. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
3. Remove the door from the vehicle. Refer to «Door Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
4. Remove the outer door handle. Refer to «Door Handle Replacement - Rear Outside»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
5. Locate and drill out all factory welds. Note the number and location of welds.
6. Grind the edges of the door outer panel to separate the outer door panel from the door shell.
7. Remove the outer door panel.
8. Remove the sealers and anti-corrosion materials from the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
9. Straighten the edges of the door shell.

1. Using a grinding disk grind the surface of the door shell mating flanges to bare steel.
2. Scuff the opposing mating surfaces of the door outer panel to remove the gloss of the E-Coat.
3. Drill 8 mm (5/16 in) plug weld holes as necessary in the locations noted from the original panel.
4. Clean the mating surfaces.
5. Apply a 3-6 mm (1/8-1/4 in) bead of metal panel bonding adhesive GM P/N 12378566/7 (Canadian P/N 88901674/5) or equivalent, to both of the mating surfaces.
6. Using a small acid brush, spread a coat of adhesive to cover all the bare metal surfaces to ensure corrosion protection.
7. Install the door outer panel to the door shell.
8. Clamp the door outer panel into position as required.
9. Using a hammer re-hem the hem flanges around the door shell. Continue to hammer in stages along the hem flanges.
10. Using lacquer thinner remove the excess adhesive from the door panel area.
11. Install the door to the vehicle check the door outer panel for proper alignment, adjust the alignment as required.
12. Metal-inert gas (MIG) weld the door outer panel to the door frame in the locations noted at the upper door frame.
13. Clean and prepare all welded surfaces.
14. Apply Fusor super flexible anti-flutter foam-fast set, Fusor P/N 121/124 or equivalent in 4-5 evenly spaced locations between the door outer panel and the inner safety beam.
15. Apply sealers and anti-corrosion materials to the repair area as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
16. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
17. Install the outer door handle. Refer to «Door Handle Replacement - Rear Outside»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
18. Remove the door from the vehicle. Refer to «Door Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/door-locks-anti-theft-systems/#door-system-mirror-system-window-system) in Doors.
19. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
20. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Remove the windshield. Refer to «Windshield Replacement»(/buick/lacrosse/i-2004-2009/remont/heated-glassdefoggers/#stationary-windows) in Stationary Windows.
7. Locate and drill out all factory welds. Note the number and location of welds for installation of the roof panel.
8. With an assistant remove the roof panel.

1. Drill 8-mm (5/16-in) plug weld holes as necessary in locations noted from the original panel.
2. Prepare all mating surfaces as necessary.
3. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces
4. With the aid of an assistant, position the roof panel to the body.
5. Plug weld accordingly.
6. Clean and prepare all welded surfaces.
7. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
8. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
9. Install the windshield. Refer to «Windshield Replacement»(/buick/lacrosse/i-2004-2009/remont/heated-glassdefoggers/#stationary-windows) in Stationary Windows.
10. Install all related panels and components.
11. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
12. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Cut the panel where sectioning is to be performed.
7. Locate and drill out all factory welds. Note the number and location of the welds for installations of the service part.
8. Remove the damaged quarter panel.

1. Cut the replacement quarter panel section in corresponding locations to fit the original panel. The sectioning joint should be trimmed to allow 11/2 times the metal thickness at the sectioning joint.
2. Create a 50-mm (2-in) backing plate from the unused portion of the service part. Trim the backing plate as necessary to fit behind the sectioning joint where no reinforcement exists.
3. Drill 8 mm (5/16 in) plug weld holes along the sectioning cut on the remaining original part. Locate these holes 13 mm (1/2 in) from the edge and spaced 40 mm (11/2 in) apart.
4. 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.
5. Prepare all attachment surfaces as necessary.
6. Apply 3M® weld-thru coating P/N 05916 or equivalent to all mating surfaces.
7. Fit the backing plate halfway into the sectioning joint. Clamp and plug weld to the vehicle.
8. Position the quarter panel.
9. Plug weld accordingly.
10. Stitch the weld sectioning joint.
11. Clean and prepare all welded surfaces.
12. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
13. Paint and repair the area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
14. Install all related panels and components.
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
16. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications.
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
6. Remove the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the rear floor panel. Refer to «Floor Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Locate, mark and drill out all factory welds attaching the control arm mounting bracket (1) and the rear rail (4) to the vehicle.
9. The factory welds attaching the control arm mounting bracket weld flange (6) to the inner rocker panel must be drilled out from inside the vehicle. IMPORTANT: The corner of the floor panel above this area will need to be positioned out of the way (6).
10. Locate, mark and drill out all factory welds. Note the number and location of welds for installation of the service assembly.
11. Remove the damaged rear rail assembly.

1. Clean and prepare the mating surfaces.
2. Verify for proper fit of the rear rail service assembly.
3. Drill 8 mm (5/16 in) plug weld holes on the service assembly as necessary in the locations noted from the original assembly.
4. Apply 3M® Weld-Thru coating P/N 05916 or equivalent to all mating surfaces.
5. Position the service assembly.
6. Verify the fit with three-dimensional measuring equipment. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Plug weld accordingly with frequent measurements to ensure proper fit.
8. Plug weld the control arm mounting bracket weld flange (6) to the inner rocker.
9. Install the rear floor panel. Refer to «Floor Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
10. Install the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
11. Clean and prepare all welded surfaces.
12. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint and Coatings.
13. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint and Coatings.
14. Install all related panels and components.
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
16. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

Sectioning procedures can be used to repair the rear rail if just the portion rearward of the crossbar is damaged. The rails are manufactured with diemarks for sectioning location. Unique service parts are available for sectioning. The sub-assembly consists of the outer rail panel with the bumper mounting brackets attached.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications.
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the rear floor panel. Refer to «Floor Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Locate the diemark in the rail.
9. Use a straight edge to scribe a line around the rail.
10. Cut the damaged rail (1) accordingly.
11. Remove the damaged section of the rail.

1. Locate the diemarks on the service part.
2. Measure forward to add 30 mm (1 3/16 in) to the service part length and mark cut lines.
3. Cut the service part and discard the unused portion.
4. Cut and remove 30 mm (1 3/16 in) from the flanges on either side (1) of the service rail (3) to create 30 mm (1 3/16 in) tabs.
5. Cut 5-mm (3/16-in) wide gaps in the bottom corners (2).
6. Step the tabs inward to allow the service section (2) to fit inside of the original rail.
7. Weld the tabs together along the edges (1).
8. Clean and prepare the mating surfaces.
9. Apply 3M® Weld-Thru Coating P/N 05916 or equivalent to all mating surfaces.
10. Position the service part.
11. Verify the fit with 3-dimensional measuring equipment. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
12. Plug weld accordingly.
13. Stitch weld along the entire joint (2).
14. Make 25 mm (1 in) welds along the seam with 25 mm (1 in) gaps between.
15. Go back and complete the stitch weld. This will create a solid joint with minimal heat distortion.
16. Install the rear floor panel. Refer to «Floor Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
17. Install the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
18. Clean and prepare all welded surfaces.
19. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
20. Paint the repaired area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
21. Install all related panels and components.
22. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
23. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
6. Remove the quarter panel. Refer to «Quarter Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
7. Remove the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
8. Locate and mark all factory welds rearward of the rear crossbar including those along the lower edge of the wheelhouse.
9. Note the number and location of welds for installation of the floor service assembly.
10. Drill out all factory welds.
11. Cut the damaged floor along the rear edge of the crossbar.
12. Do not damage the following components: The rear rails The crossbar The wheelhouse
13. Remove the damaged floor section.

1. Measure 845 mm (331/4 in) from the rear edge of the rear floor service assembly forward and mark the location (1).
2. Prepare the mating surfaces as necessary.
3. Check for proper fit.
4. Allow the floor service assembly (3) to overlap the original floor on top of the rear crossbar (2).
5. Mark the location of the rear rail and crossbar flanges on the bottom of the floor service assembly.
6. Drill 8 mm (5/16 in) plug weld holes as necessary in the locations noted from the original floor assembly.
7. Drill holes approximately 40 mm (1 in) apart where the new floor section attaches to the rear rail and crossbar flanges.
8. Position the service assembly and check for proper fit.
9. Apply 3M Weld-Thru Coating P/N 05916 or equivalent to all mating surfaces.
10. Plug weld accordingly.
11. Install the quarter panel. Refer to «Quarter Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
12. Install the rear end panel. Refer to «Panel Replacement - Rear End»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
13. Clean and prepare all welded surfaces.
14. Apply the sealers and anti-corrosion materials to the repair area, as necessary. Refer to «Anti-Corrosion Treatment and Repair»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
15. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
16. Install all related panels and components.
17. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
18. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) in SIR.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Remove all related panels and components.
4. Repair as much of the damage as possible to factory specifications. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.

1. Prepare the mating surfaces as necessary. Inspect or 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 3M® Weld-Thru Coating P/N 05916 or equivalent to all mating surfaces.
4. Position the service panel, check with 3-dimensional measuring equipment. Refer to «Dimensions - Body»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#collision-repair) .
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»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__anti-corrosion-treatment-and-repair) in Paint/Coatings.
8. Paint the repair area. Refer to «Basecoat/Clearcoat Paint Systems»(/buick/lacrosse/i-2004-2009/remont/paintcoatings/#paintcoatings__basecoatclearcoat-paint-systems) in Paint/Coatings.
9. Install all related panels and components.
10. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (L26)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) or «Battery Negative Cable Disconnect/Connect Procedure (LY7)»(/buick/lacrosse/i-2004-2009/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
11. Enable the SIR system. Refer to «SIR Disabling and Enabling Zones»(/buick/lacrosse/i-2004-2009/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling-zones) .

Metal Panel Bonding

This is intended to provide general guidelines for adhesive bonding of exterior panels as an alternative to Metal-Inert Gas (MIG) welding. Panel bonding may be seen as an alternative to MIG welding to provide full panel replacement in regards to collision repair procedures. The benefits of panel bonding is

1. No heat or burn damage when additional welding is not required
2. Corrosion protection
3. Can act as a sealant
4. Improved process for complicated shapes (wheelhouse area)

The General Motors specification for metal bonding adhesives is GM 6449G. The scope of this specification is intended to provide the performance guidelines of structural adhesive systems used to repair (metallic) automotive bodies in the aftermarket. These types of adhesives are intended for use when bonding replacement body panels as an option to welding as the attachment means. GM information outlines the use of room temperature cure acrylic adhesives that contain glass bead technology.

Bonding procedures in general are applicable only to a factory seams type approach.

Sectioning or partial paneling of full panels is not supported by General Motors unless specifically documented in a Service Bulletin or Manual.

Applicable components for this technology are EXTERIOR PANELS ONLY, including door skins, tail panels, roof outer panels and quarter panels.

Adhesives currently meeting the performance requirements include General Motors materials and products manufactured by Lord Adhesives. At this time, ONLY the adhesive products listed below meet this guideline

Metal Panel Bonding

See also:
• Approved Equipment for Collision Repair Caution
• Foam Sound Deadeners Caution
• SIR Disabling and Enabling Zones
• Battery Negative Cable Disconnect/Connect Procedure (L26)
• Collision Sectioning Caution
• Anti-Corrosion Treatment and Repair
• Basecoat/Clearcoat Paint Systems
• Windshield Replacement
• Door Replacement - Front
• Battery Disconnect Caution
• SIR Caution
• Radiator Support Replacement
• Metal Panel Bonding