Headlining Trim Panel Replacement Trailblazer EXT, Envoy XL

1. Ensure the ignition switch is in the LOCK position.
2. Remove the cargo net, if equipped.
3. Remove the luggage/cargo shelf assembly, if equipped.
4. Remove the right sound insulator panel. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages, and Console.
5. Remove the front door sill plates. Refer to Front Side Door Sill Plate Replacement .
6. Remove the rear door sill plates. Refer to Rear Side Door Sill Plate Replacement .

Notice: Remove the headliner and the headliner harness as an assembly. Do NOT cut or splice the headliner harness. Cutting or splicing the harness may damage the coax cable, resulting in poor radio performance.

7. Remove the center pillar trim panels. Refer to Center Pillar Garnish Molding Replacement .
8. Remove the windshield garnish moldings. Refer to Windshield Pillar Garnish Molding Replacement .
9. Remove the instrument panel (IP) trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.



10. Open the IP compartment door and lower the door to the full down position.
11. Disconnect the coax cable (2) and the headliner harness electrical connector (1), located near the bottom of the HVAC blower motor.



12. Remove the lower rosebud (2) that fastens the headliner harness to the cowl.
13. Remove the 3 clips (1) retaining the headliner harness to the right windshield pillar.
14. Attach a mechanic's wire to the end of the headliner harness.
15. The wire harness is routed through the cowl insulation access hole, behind the IP. In order to remove the wire harness, grasp the headliner harness near the bottom of the windshield and carefully pull upward.
16. Leaving the mechanic's wire positioned behind the IP, remove the headliner harness from the mechanics wire.
17. Remove the front and rear overhead console, If equipped . Refer to Roof Console Replacement , or to Roof Rear Console Replacement .
18. Remove the video display, if equipped. Refer to Video Display Replacement .
19. Remove the sunshades from the headliner. Refer to Sunshade Replacement .
20. Remove the sunshade retainer clips.
21. Remove the third row seats.
22. Remove the second row seats. Refer to Rear Seat Replacement in Seats.
23. Remove the left/right front body side window garnish molding. Refer to Body Side Rear Window Garnish Molding Replacement .
24. Remove the left/right rear body side window garnish molding. Refer to Body Side Window Rear Garnish Molding Replacement .
25. Remove the lift gate door sill plate. Refer to Liftgate Door Sill Plate Replacement .
26. Remove the left rear quarter lower trim panel. Refer to Rear Quarter Trim Panel Replacement - Left Side .
27. Remove the right rear quarter lower trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .
28. Remove the bolts from the cargo tie-down loops.



29. Remove the nut (1), securing the stowage jack carrier to the wheelhouse panel.
30. Loosen the three bolts that secure the jack carrier to the vehicle.
31. Remove the carpet from around the wheel stud.
32. Remove the body electrical block. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.




Peel the carpet forward and up over the front seats. Note that the carpet hooks around the wheel house panel stud.




34. Remove the headliner harness from the left-hand third pillar.
35. Remove the headliner harness from the floor studs.
36. Remove the third pillar headliner harness electrical connector from the body electrical block, and the block base from the floor panel. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.



37. Reach underneath the carpet and disconnect the 6 - way headliner harness electrical connector (1) from the cross-body wire harness.



38. Remove the navigational antenna cable from the right-hand third pillar.
39. Remove the navigational antenna cable from the floor studs.
40. Pull the communication interface module electrical connectors back through the hole in the carpet.
41. Remove the cellular antenna coax cable from the inner coupling on the left body side window. Refer to Mobile Telephone Antenna Inner Coupling Replacement .
42. Remove the coat hooks from the roof panel. Refer to Coat Hook Replacement .
43. Disconnect the antenna module electrical connector from the right and left body side windows. Refer to Radio Control Module Replacement in Entertainment.



44. Disconnect the electrical connector from the right-hand body side window actuator.
45. Disconnect the electrical connector from the left-hand body side window actuator.



46. Remove the windshield rearview mirror wire harness cover.
47. Disconnect the inside rear view mirror electrical connector (3).
48. Disconnect the rain sensor electrical connector (2), if equipped.
49. Disconnect the coax cable (1) from the navigational antenna, if equipped.



50. Remove the bolt securing the auxiliary air conditioning duct to the vehicle.



51. Remove the 2 push pins (2,3) from the rear of the headliner.
52. Release the assist handles from the roof panel. Refer to Assist Handle Replacement .
53. With the aid of an assistant, lower the headliner to release the interlocking strips (1) that retain the headliner to the roof panel.



54. If the vehicle is equipped with a sunroof, partially lower the headliner and disconnect the sunroof assembly electrical connector.
55. With the aid of an assistant, remove the headliner from the vehicle.

1. With the aid of an assistant, install the headliner into the vehicle.



2. If the vehicle is equipped with a sunroof, partially raise the headliner and connect the sunroof assembly electrical connector.



3. With the aid of an assistant, fully raise the headliner and ensure that the retaining strips (1) are engaged, and the headliner harnesses (4) hang free of the headliner.
4. Install the assist handles to the roof panel. Refer to Assist Handle Replacement .
5. Install the right rear push pin (2)
6. Install the left rear push pin (3).
7. Install the sunshades to the headliner. Refer to Sunshade Replacement .
8. Install the left and right sunshade retaining clips (5).

Tighten
Tighten the sunshade retaining clip screws to 10 N·m (88 lb in).




9. Install the auxiliary air conditioning duct to the vehicle with the bolt.

Tighten
Tighten the auxiliary air conditioning duct bolt to 10 N·m (88 lb in).




10. Connect the coax cable (1) to the navigation antenna, if equipped.
11. Connect the rain sensor electrical connector (2), if equipped.
12. Connect the inside rear view mirror electrical connector (3).
13. Install the windshield rearview mirror wire harness cover.
14. Install the video display. Refer to Video Display Replacement .
15. If equipped, install the front and rear overhead console. Refer to Roof Console Replacement , or to Roof Rear Console Replacement .



16. Attach the mechanic's wire to the end of the headliner harness.
17. Pull the bottom of the mechanic's wire away from the cowl insulation access hole in order to position the headliner harness behind the IP.
18. Attach the 3 clips (1) securing the wire harness to the windshield pillar.
19. Attach the lower rosebud (2) retaining the headliner harness to the cowl.



20. Connect the coax cable (2) and headliner harness connector (1).
21. Close the IP compartment door.
22. Install the IP trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.
23. Install the windshield garnish moldings. Refer to Windshield Pillar Garnish Molding Replacement .
24. Install the center pillar trim panels. Refer to Center Pillar Garnish Molding Replacement .
25. Install the front side door sill plates. Refer to Front Side Door Sill Plate Replacement .
26. Install the right sound insulator. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages, and Console.
27. Install the coat hooks to the roof panel. Refer to Coat Hook Replacement .
28. Connect the cellular antenna coax cable to the inner coupling on the left body side window. Refer to Mobile Telephone Antenna Inner Coupling Replacement in Cellular Communication.
29. Connect the antenna module electrical connector to the right and left body side window. Refer to Radio Control Module Replacement in Entertainment.



30. Install the headliner harness to the left third pillar.
31. Install the headliner harness to the floor studs.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

32. Install the ground terminals and the ground bolt to the left center pillar.

Tighten
Tighten the ground bolt to 10 N·m (88 lb in).




33. Reach underneath the carpet and install the 6 - way headliner harness electrical connector (1) to the cross-body wire harness.
34. Pass the communication interface module electrical connectors through the small hole in the carpet.
35. Install the headliner harness retaining clips to the rocker panel and the floor panel.



36. If equipped with OnStar® perform the following procedure:

36.1.

Install the navigation antenna cable to the right 'C' pillar.

36.2.

Install the navigation antenna cable to the floor studs.

37. Install the body electrical block. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.



38. Install the rear carpet. Ensure that the carpet hooks over the left wheelhouse panel stud.



39. Connect the electrical connector to the left-hand body side window actuator.
40. Connect the electrical connector to the right-hand body side window actuator.



41. Install the nut (1) securing the stowage jack carrier to the wheelhouse panel.
42. Install the right rear quarter lower trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .
43. Install the left rear quarter lower trim panel. Refer to Rear Quarter Trim Panel Replacement - Left Side .
44. Install the left/right rear body side trim rear window garnish molding. Refer to Body Side Window Rear Garnish Molding Replacement .
45. Install the left/right front body side window garnish molding. Refer to Body Side Rear Window Garnish Molding Replacement .
46. Install the lift gate door sill plate. Refer to Liftgate Door Sill Plate Replacement .
47. Install the cargo tie-down loops.

Tighten
Tighten the cargo tie-down loop bolts to 35 N·m (26 lb ft).

48. Install the rear side door sill plates. Refer to Rear Side Door Sill Plate Replacement .
49. Install the second row seats. Refer to Rear Seat Replacement in Seats.
50. Install the third row seats.
51. Install the luggage/cargo shade assembly, if equipped.
52. Install the cargo net, if equipped.

Headlining Trim Panel Replacement Trailblazer, Envoy, Bravada

1. Ensure the ignition switch is in the LOCK position.
2. Remove the cargo net, if equipped.
3. Remove the luggage/cargo shelf assembly, if equipped.
4. Remove the right sound insulator panel. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages, and Console.
5. Remove the front door sill plates. Refer to Front Side Door Sill Plate Replacement .
6. Remove the rear door sill plates. Refer to Rear Side Door Sill Plate Replacement .

Notice: Remove the headliner and the headliner harness as an assembly. Do NOT cut or splice the headliner harness. Cutting or splicing the harness may damage the coax cable, resulting in poor radio performance.

7. Remove the center pillar trim panels. Refer to Center Pillar Garnish Molding Replacement .
8. Remove the windshield garnish moldings. Refer to Windshield Pillar Garnish Molding Replacement .
9. Remove the instrument panel (IP) trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.



10. Open the IP compartment door and lower the door to the full down position.
11. Disconnect the coax cable (2) and the headliner harness electrical connector (1), located near the bottom of the HVAC blower motor.



12. Remove the lower rosebud (2) that fastens the headliner harness to the cowl.
13. Remove the 3 clips (1) retaining the headliner harness to the right windshield pillar.
14. Attach a mechanic's wire to the end of the headliner harness.
15. The wire harness is located in the cowl insulation access hole, behind the IP. In order to remove the wire harness, grasp the headliner harness near the bottom of the windshield and carefully pull upward.
16. Leaving the mechanic's wire positioned behind the IP, remove the headliner harness from the mechanics wire.
17. Remove the video display. Refer to Video Display Replacement .
18. If equipped, remove the front and rear overhead console. Refer to Roof Console Replacement , or to Roof Rear Console Replacement .
19. Remove the sunshades from the headliner. Refer to Sunshade Replacement .
20. If equipped with OnStar®, perform the following procedure:

20.1.

Disconnect the navigation antenna cable from the communication interface module. Refer to Navigation Control Processor Bracket Replacement in Cellular Communication.

20.2.

Remove the navigation antenna cable from the right side door rocker panel attachments.

20.3.

Remove the navigation antenna cable from the right center pillar.




21. Remove the following headliner harness clips from the left center pillar:

•	The center pillar harness clips (4)

•	The center pillar harness clips (3)

•	The center pillar harness clips (1)

22. Remove the center pillar harness ground bolt (2).
23. Remove the harness from the left center pillar.



24. Remove the rear seats. Refer to Rear Seat Number 1 Back Replacement , and to Rear Seat Cushion Replacement in Seats.
25. Remove the headliner harness retaining clips (2) from the rocker panel and floor panel.
26. Remove the center pillar headliner harness electrical connector from the bussed electrical center, and the block base from the floor panel. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.
27. Reach underneath the carpet and remove the headliner harness electrical connector (1) from the IP wire harness.



28. Disconnect the inside rear view mirror electrical connector (6).
29. Disconnect the rain sensor electrical connector, if equipped.
30. Disconnect the navigation antenna electrical connector, if equipped.
31. Remove the upper rear quarter trim panels. Refer to Rear Quarter Upper Trim Panel Replacement .
32. Remove the coat hooks from the roof panel. Refer to Coat Hook Replacement .
33. Disconnect the radio control module electrical connector from the right body side window. Refer to Radio Control Module Replacement in Entertainment.
34. Disconnect the radio antenna module electrical connector from the left body side window. Refer to Radio Antenna Module Replacement in Entertainment.
35. Disconnect the electrical connector from the cellular phone antenna. Refer to Mobile Telephone Antenna Coaxial Cable Replacement in Cellular Communication.
36. Remove the 2 push pins from the rear of the headliner.
37. Release the assist handles from the roof panel. Refer to Assist Handle Replacement .
38. Fully recline the bucket seats.
39. With the aid of an assistant, release the interlocking strips (1) that retain the headliner to the roof panel.



40. If the vehicle is equipped with a sunroof, partially lower the headliner and disconnect the sunroof assembly electrical connector.
41. With the aid of an assistant, remove the headliner from the vehicle.

1. With the aid of an assistant, install the headliner into the vehicle.



2. If the vehicle is equipped with a sunroof, partially raise the headliner and connect the sunroof assembly electrical connector.



3. With the aid of an assistant, fully raise the headliner and install the left inboard sunshade retaining clip (5). Refer to Mobile Telephone Antenna Inner Coupling Replacement and Mobile Telephone Antenna Outer Coupling Replacement .
4. Install the right rear push pin (2)
5. Install the left rear push pin (3).
6. Install the assist handles to the roof panel. Refer to Assist Handle Replacement .
7. Connect the electrical connector to the cellular phone antenna. Refer to Mobile Telephone Antenna Coaxial Cable Replacement in Cellular Communication.
8. Connect the radio control module electrical connector to the right body side window. Refer to Radio Control Module Replacement in Entertainment.
9. Install the coat hooks to the roof panel. Refer to Coat Hook Replacement .
10. Connect the radio antenna module electrical connector to the left body side window. Refer to Radio Antenna Module Replacement in Entertainment.
11. Install the upper rear quarter trim panels. Refer to Rear Quarter Upper Trim Panel Replacement .
12. Connect the navigation antenna electrical connector, if equipped.
13. Connect the rain sensor electrical connector, if equipped.
14. Connect the inside rear view mirror electrical connector (6).
15. If the vehicle is NOT equipped with a sunroof, seat the 2 interlocking strips (1).



16. If the vehicle is equipped with a sunroof, seat the 6 interlocking strips.



17. Reach underneath the carpet and remove the headliner harness electrical connector (1) from the IP wire harness.
18. Install the center pillar headliner harness electrical connector to the bussed electrical center, and the block base to the floor panel. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.
19. Install the headliner harness retaining clips (2) to the rocker panel and the floor panel.



20. Install the headliner harness to the left center pillar.
21. Install the following headliner harness clips to the center pillar:

•	The center pillar harness clips (1)

•	The center pillar harness clips (3)

•	The center pillar harness clips (4)

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

22. Install the ground terminals and the ground bolt (2) to the center pillar.

Tighten
Tighten the bolt to 10 N·m (88 lb in).

23. If equipped with OnStar® perform the following procedure:

23.1.

Install the navigation antenna cable to the right center pillar.

23.2.

Install the navigation antenna cable to the right side door sill attachments.

23.3.

Install the navigation antenna cable to the communication interface module. Refer to Navigation Control Processor Bracket Replacement in Cellular Communication.

24. Install the sunshades to the headliner. Refer to Sunshade Replacement .
25. If equipped, install the front and rear overhead console. Refer to Roof Console Replacement , or to Roof Rear Console Replacement .
26. Install the video display. Refer to Video Display Replacement .



27. Attach the mechanic's wire to the end of the headliner harness positioned behind the IP.
28. Pull the bottom of the mechanic's wire away from the cowl insulation access hole in order to position the headliner harness behind the IP.
29. Attach the 3 clips (1) securing the wire harness to the windshield pillar.
30. Attach the lower rosebud (2) retaining the headliner harness to the cowl.



31. Connect the coax cable (2) and headliner harness connector (1).
32. Close the IP compartment door.
33. Install the right sound insulator. Refer to Instrument Panel Insulator Panel Replacement in Instrument Panel, Gages, and Console.
34. Install the IP trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gages, and Console.
35. Install the windshield garnish moldings. Refer to Windshield Pillar Garnish Molding Replacement .
36. Install the center pillar trim panels. Refer to Center Pillar Garnish Molding Replacement .
37. Install the rear side door sill plates. Refer to Rear Side Door Sill Plate Replacement .
38. Install the front side door sill plates. Refer to Front Side Door Sill Plate Replacement .
39. Install the rear seats. Refer to Rear Seat Number 1 Back Replacement and Rear Seat Cushion Replacement in Seats.
40. Install the luggage/cargo shelf assembly, if equipped.
41. Install the cargo net, if equipped.