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Body Rear End Buick LaCrosse I

Exterior Body Panels 7 illustrations ~2304 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Fuel Filler Actuator Bolt6 N.m53 lb in
Fuel Filler Door Actuator Cable Nut2 N.m18 lb in
Fuel Filler Door Retaining Nuts10 N.m89 lb in
Fuel Filler Neck Bolts5 N.m44 lb in
Rear Compartment Hinge Nuts25 N.m18 lb ft
Rear Compartment Hinge to Rear Quarter Bolts25 N.m18 lb ft
Rear Compartment Latch Nuts10 N.m89 lb in
Rear Compartment Lid Ajar Switch Screw5 N.m44 lb in
Rear Compartment Lid Lock Striker Bolts16 N.m12 lb ft
Rear Wheelhouse Panel Bolts10 N.m89 lb in
Rear Compartment Lock Actuator Bolts6 N.m53 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Body Rear End Schematics
Scheme 1: Body Rear End Schematics

Scheme 2

Scheme 2: Body Rear End Component Views
Scheme 2: Body Rear End Component Views
CalloutComponent Name
1Rear Compartment Lid Latch
2Rear Compartment Courtesy Lamp

Scheme 3

Scheme 3
Scheme 3
CalloutComponent Name
1Rear Compartment Lid
2Rear Compartment Lid Ajar Switch

Rear Compartment Lid Latch Connector Part Information OEM: 15398831 (Delphi) 6-1355678-1 (AMP) Service: See Catalog 4-Way F Micro Timer 3 REC Housing Series Sealed (BK) Pin Wire Color Circuit No. Function 1 OG/BK 737 Rear Compartment Courtesy Lamp Switch 2 RD/BK 744 Rear Compartment Lid Ajar Switch 3 BK 750 Ground 4 L-BU 1344 Trunk Release Control

Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check will provide the following information

  1. The identification of the control modules which command the system
  2. The ability of the control modules to communicate through the serial data circuit
  3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

IMPORTANTReview the system description and operation in order to familiarize yourself with the system functions.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the body rear end system. Refer to «Checking Aftermarket Accessories»(/buick/lacrosse/i-2004-2009/remont/body-electrical/#how-to-diagnosis-repair-the-wiring-systems-testing__checking-aftermarket-accessories) in Wiring Systems.
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Trunk Release Inoperative»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end__trunk-release-inoperative)
  2. «Trunk Ajar Indicator Always On»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end__trunk-ajar-indicator-always-on)
  3. «Trunk Ajar Indicator Inoperative»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end__trunk-ajar-indicator-inoperative)

Trunk Release Inoperative

StepActionYesNo
Schematic Reference: Body Rear End Schematics
1Did you perform the Diagnostic System Check - Vehicle?Go to Step 2Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2Install a scan tool. Turn ON the ignition, with the engine OFF, car in PARK. With a scan tool, view the trunk release output parameter in the remote function actuator (RFA). With a scan tool, command the trunk release ON and OFF. Does the parameter change state?Go to Step 3Go to Step 22
3Does the rear compartment lid release operate?Go to Step 4Go to Step 9
4With a scan tool, view the trunk release switch parameter in the body control module (BCM). Press the trunk release switch. Does the parameter change state?Go to Step 7Go to Step 5
5Disconnect the rear compartment lid release switch. Connect a fused jumper between the battery positive voltage supply circuit of the trunk release switch and the ground circuit of the trunk release switch. View the trunk release switch parameter. Does the parameter change state?Go to Step 21Go to Step 6
6Connect a fused jumper between the battery positive voltage supply circuit of the trunk release switch and a good ground. View the trunk release switch parameter. Does the parameter change state?Go to Step 17Go to Step 18
7Remove the trunk release relay. Disconnect the trunk release actuator. Install a fused jumper wire between the battery positive voltage circuit of the trunk release relay and the trunk release actuator supply circuit of the trunk release relay. Connect a test lamp between supply circuit of the trunk release actuator and the ground circuit of the trunk release actuator. Does the test lamp illuminate?Go to Step 20Go to Step 8
8Connect a test lamp between the supply circuit of the trunk release actuator and a good ground. Does the test lamp illuminate?Go to Step 16Go to Step 15
9Remove the trunk release relay. Connect a test lamp between the battery positive voltage circuit of the trunk release relay and a good ground. Does the test lamp illuminate?Go to Step 10Go to Step 14
10Connect a test lamp between the battery positive voltage circuit of the trunk release relay and the control circuit of the rear compartment lid release relay. Press the trunk release button. Does the test lamp turn ON and OFF with each command?Go to Step 19Go to Step 11
11Did the test lamp remain illuminated with each command?Go to Step 13Go to Step 12
12Test the control circuit of the trunk release relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 22
13Test the control circuit of the trunk release relay for a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 22
14Repair the high resistance or open in the control circuit of the trunk release relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?Go to Step 29
15Repair the high resistance or open in the control circuit of the trunk release actuator. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29
16Repair the high resistance or open in the ground circuit of the trunk release actuator. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?Go to Step 29
17Repair the high resistance or open in the ground circuit of the trunk release switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?Go to Step 29
18Test the control circuit of the trunk release switch for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find or correct the condition?Go to Step 29Go to Step 23
19Inspect for poor connections at the trunk release relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 24
20Inspect for poor connections at the trunk release actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 25
21Inspect for poor connections at the harness connector of the trunk release switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 26
22Inspect for poor connections at the harness connector of the RFA. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 27
23Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 29Go to Step 28
24Replace the trunk release relay. Did you complete the replacement?Go to Step 29
25Replace the trunk release actuator. Did you complete the replacement?Go to Step 29
26Replace the trunk release switch. Did you complete the replacement?Go to Step 29
27Replace the RFA. Did you complete the replacement?Go to Step 29
28IMPORTANT: When replacing the BCM refer to Control Module References in Computer/Integrating Systems. Replace the BCM. Refer to Control Module References in Computer/Integrating Systems.Did you complete the replacement?Go to Step 29
29Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 2
IMPORTANT
When replacing the BCM refer to Control Module References in Computer/Integrating Systems.

Trunk Release Inoperative

Trunk Ajar Indicator Always On

StepActionYesNo
Schematic Reference: Body Rear End Schematics
1Did you review the Luggage Compartment Description and Operation, and perform the necessary inspections?Go to Step 2Go to Luggage Compartment Description and Operation
2Close the rear compartment. Is the trunk ajar indicator illuminated?Go to Step 3Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3Disconnect the rear compartment lid latch. Is the trunk ajar indicator illuminated?Go to Step 4Go to Step 5
4Test the rear compartment lid ajar switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 8Go to Step 7
5Inspect for poor connections at the harness connector of the rear compartment lid latch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 8Go to Step 6
6Replace the rear compartment lid latch. Refer to Latch Replacement - Rear Compartment Lid . Did you complete the repair?Go to Step 8
7Replace the driver information center (DIC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair?Go to Step 8
8Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Trunk Ajar Indicator Always On

Trunk Ajar Indicator Inoperative

StepActionYesNo
Schematic Reference: Body Rear End Schematics
1Did you review the Luggage Compartment Description and Operation, and perform the necessary inspections?Go to Step 2Go to Luggage Compartment Description and Operation
2Open the rear compartment. Does the trunk ajar indicator illuminate?Go to Testing for Intermittent Conditions and Poor Connections in Wiring SystemsGo to Step 3
3Disconnect the rear compartment lid latch. Connect a fused jumper wire between the rear compartment lid ajar switch signal circuit and a good ground. Does the trunk ajar indicator illuminate?Go to Step 4Go to Step 5
4Connect a fused jumper between the rear compartment lid ajar switch signal circuit and the rear compartment lid ajar switch ground circuit. Does the trunk ajar indicator illuminate?Go to Step 7Go to Step 6
5Test for an open or high resistance in the signal circuit of the rear compartment lid latch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 10Go to Step 9
6Test for an open or high resistance in the ground circuit of the rear compartment lid latch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 10
7Inspect for poor connections at the harness connector of the rear compartment lid latch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 10Go to Step 8
8Replace the rear compartment lid latch. Refer to Latch Replacement - Rear Compartment Lid . Did you find and correct the condition?Go to Step 10
9Replace the driver information center (DIC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you find and correct the condition?Go to Step 10
10Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Trunk Ajar Indicator Inoperative

Removal Procedure

  1. Open the rear compartment.
  2. Remove the rear compartment lid latch. Refer to «Latch Replacement - Rear Compartment Lid»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  3. Remove the screw (5) from the rear compartment lid ajar/lid lamp switch.
  4. Remove the electric connector.
  5. Remove the rear compartment lid ajar/lid lamp switch.

Installation Procedure

  1. Position the rear compartment lid ajar switch to the rear compartment lid latch.
  2. Install the electric connector.
  3. Install the screw (5) to the rear compartment lid ajar/lid lamp switch. Tighten: Tighten the rear compartment lid ajar switch screw to 5 N.m (44 lb in).
  4. Install the rear compartment lid latch. Refer to «Latch Replacement - Rear Compartment Lid»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  5. Close the rear compartment.
  1. Open the rear compartment.
  2. Remove the rear compartment stowage net and net retainers.
  3. Pull up on the rear compartment sill plate to release the retainers.
  4. Remove the rear compartment sill plate from rear compartment.
  1. Align the sill plate retainers to the slots in the rear compartment.
  2. Press down on the sill plate to ensure the retainers are fully seated.
  3. Install the rear compartment stowage net.
  4. Close the rear compartment.

Tools Required

J 38778 Door Trim Pad Clip Remover

  1. Open the rear compartment.
  2. If equipped, remove the rear compartment convenience net and net retainers.
  3. Remove the sill plate. Refer to «Compartment Sill Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Remove the floor trim panel. Refer to «Floor Trim Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  5. Remove the seat back. Refer to «Seat Back Replacement - Rear (Non-folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) or «Seat Back Replacement - Rear (Folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) in Seats.
  6. Use J 38778 to remove the push-in retainers from the trim panels.
  7. Slide the panels off the metal supports.
  8. Remove the trim panels from the rear compartment.
  1. Position the trim panels in the rear compartment.
  2. Position the trim panels on the metal supports by the rear seat back.
  3. Install the push-in retainers.
  4. Install the floor trim panel. Refer to «Floor Trim Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  5. Install the seat back. Refer to «Seat Back Replacement - Rear (Non-folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) or «Seat Back Replacement - Rear (Folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) in Seats.
  6. Install the sill plate. Refer to «Compartment Sill Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  7. Install the rear compartment convenience net, if equipped.
  8. Close the rear compartment.
  1. Remove the rear seat back. Refer to «Seat Back Replacement - Rear (Non-folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) or «Seat Back Replacement - Rear (Folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) in Seats.
  2. Remove the push-in retainers from the rear compartment side trim panels.
  3. Slide out the front panel from the 2 side panels.
  4. Remove the front trim panel from the vehicle.
  1. Position the front trim panel in the vehicle.
  2. Slide the panel under the 2 side panels.
  3. Install the push-in retainers in the rear compartment side trim panels.
  4. Install the rear seat back. Refer to «Seat Back Replacement - Rear (Non-folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) or «Seat Back Replacement - Rear (Folding)»(/buick/lacrosse/i-2004-2009/remont/seats/#seat-system) in Seats.
  1. Open the rear compartment.
  2. Remove the rear compartment sill plate. Refer to «Compartment Sill Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  3. Lift up on the center of the floor trim plate and remove either edge from the side panel.
  4. Remove the floor trim plate from the rear compartment.
  1. Position the floor trim plate into the rear compartment.
  2. Engage the sides of the floor trim plate, pressing the sides into place.
  3. Install the rear compartment sill plate. Refer to «Compartment Sill Plate Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Close the rear compartment.

J 38778 Door Trim Pad Clip Remover

  1. Open the rear compartment lid.
  2. Use J 38778 to remove the push-in retainers from the trim panel on the rear compartment lid.
  3. Remove the trim panel from the rear compartment lid.
  1. Position the trim panel to the rear compartment lid.
  2. Install the push-in retainers to the trim panel.
  3. Close the rear compartment lid.

Scheme 4

Scheme 4: Wheelhouse Liner Panel Replacement - Rear
Scheme 4: Wheelhouse Liner Panel Replacement - Rear
CalloutComponent Name
NOTE: Refer to Fastener Notice in Cautions and Notices. Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Bolt, Rear Wheelhouse Liner (Qty: 4) Tighten: 10 N.m (89 lb in)
2Nut, Rear Wheelhouse Liner (Qty: 2) Tighten: 10 N.m (89 lb in)
3Liner, Rear Wheelhouse
NOTE
Refer to Fastener Notice in Cautions and Notices.

Wheelhouse Liner Panel Replacement - Rear

  1. Open the fuel filler door.
  2. Remove the fuel filler pocket. Refer to «Fuel Filler Pocket Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  3. Drill out the fuel filler door rivets from the inside of the quarter panel.
  4. Remove the fuel filler door.
  1. Align the fuel filter door to the holes in the quarter panel.
  2. Install the rivets inside on the fuel filler door.
  3. Install the fuel filler pocket. Refer to «Fuel Filler Pocket Replacement»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Close the fuel filler door.
  1. Open the fuel filler door.
  2. Remove the fuel filler cap.
  3. Remove the bolts from the fuel filler pocket at the fuel filler neck.
  4. Apply tape to the opening around the fuel filler pocket
  5. Remove the fuel filler pocket using a small flat-bladed tool, pressing down and out from the top edge of the fuel filler pocket.
  1. Install the fuel filler pocket to the fuel filer neck.
  2. Press in until the fuel filler pocket is fully seated to the quarter panel.
  3. Install the bolts. Tighten: Tighten the fuel filler neck bolts to 5 N.m (44 lb in).
  4. Remove all tape from fuel filler pocket opening.
  5. Replace the fuel filler cap.
  6. Close the fuel filler door.

Scheme 5

Scheme 5: Compartment Lid Replacement - Rear
Scheme 5: Compartment Lid Replacement - Rear
CalloutComponent Name
NOTE: Refer to Fastener Notice . Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Rear Compartment Lid Nuts (Qty: 4) Tighten: 25 N.m (19 lb ft)
2Rear Compartment Lid Tip: Disconnect electrical connector.
NOTE
Refer to Fastener Notice .

Compartment Lid Replacement - Rear

  1. Open the rear compartment.
  2. Use a grease pencil to mark the hinge to the rear compartment lid for the location at installation.
  3. Disconnect the lid harness in the rear compartment.
  4. Remove the rear compartment hinge to lid nuts. Refer to «Compartment Lid Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  5. Remove the rear compartment struts. Refer to «Strut Replacement - Rear Compartment Lid»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  6. Use a grease pencil to mark the quarter panel hinge to the quarter panel. The mark will help you align the hinge at installation.
  7. Remove the bolts that attach the hinge to the rear quarter.
  8. Remove the hinge from the quarter panel.
  1. Align the hinge to the alignment marks that was made on the quarter panel.
  2. Install the bolts that attach the hinge to the rear quarter. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  3. Install the rear compartment struts. Refer to «Strut Replacement - Rear Compartment Lid»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Install the rear compartment lid nuts. Refer to «Compartment Lid Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  5. Adjust the rear compartment lid height: Use an Allen wrench to turn the rear compartment hinge height adjustment bumper. Turn the rear compartment lid bumper by hand.
  6. Close the rear compartment.
  1. Open and support the rear compartment lid.
  2. Use a small flat-bladed tool in order to lift up the locking clip on the strut upper ball stud.
  3. Press out the upper ball stud.
  4. Use a small flat-bladed tool in order to lift up the locking clip on the strut lower ball stud.
  5. Press out the lower ball stud.
  6. Remove the rear compartment lid strut from the hinge.
  1. Position the rear compartment lid strut to the hinge.
  2. Press in the lower ball stud.
  3. Press in the upper ball stud.
  4. Close both locking clips.
  5. Remove the rear compartment lid support.
  6. Close the rear compartment.
  1. Open the rear compartment.
  2. Remove the rear compartment lid carpet. Refer to «Compartment Lid Trim Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end)
  3. Use a grease pencil to mark the location of the rear compartment lid latch to the rear compartment lid.
  4. Disconnect the electrical connectors from the rear compartment lid latch.
  5. Disconnect the lock cylinder actuator cable from the lock cylinder.
  6. Remove the rear compartment lid latch to rear compartment lid nuts.
  7. Remove the rear compartment lid latch from the rear compartment lid.
  1. Position the rear compartment lid latch to the alignment marks on the rear compartment lid.
  2. Install the rear compartment lid latch to rear compartment lid nuts. Tighten: Tighten the nuts to 10 N.m (89 lb in).
  3. Connect the electrical connectors to the rear compartment lid latch.
  4. Connect the lock cylinder actuator cable to the lock cylinder.
  5. Install rear compartment lid carpet. Refer to «Compartment Lid Trim Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end)
  6. Close the rear compartment.
  1. Pull back the rear compartment trim as required to access the lock striker. Refer to «Compartment Trim Panel Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  2. Use a grease pencil to mark the location of the lock striker to the rear compartment for its location at installation.
  3. Remove the bolt from the rear compartment lid lock striker in the rear compartment.
  4. Remove the rear bumper fascia. Refer to «Fascia, Bracket, Bar, Absorber Replacement - Rear Bumper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#bumper-system) .
  5. Remove the rear compartment lid lock striker bolts from under the rear bumper fascia above the impact bar to the body panel.
  6. Remove the rear compartment lid lock striker from the rear compartment body panel.
  1. Position the rear compartment lid lock striker to the rear compartment body panel.
  2. Install the bolts in the center hole in the rear compartment lid lock striker under the rear bumper fascia above the impact bar to the rear body panel.
  3. Partially tighten the bolt to allow for adjustment of the rear compartment lid lock striker.
  4. Close the rear compartment lid and adjust the rear compartment lid striker as required.
  5. Install the other rear compartment lid lock striker bolts to under the rear bumper fascia above the impact bar to the rear body panel. Tighten: Tighten the bolts to 16 N.m (12 lb ft).
  6. Install the bolts to the lock striker in the rear compartment. Tighten: Tighten the bolts to 16 N.m (12 lb ft).
  7. Install the rear bumper fascia. Refer to «Fascia, Bracket, Bar, Absorber Replacement - Rear Bumper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#bumper-system) .
  8. Install the rear compartment trim. Refer to «Compartment Trim Panel Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  9. Close the rear compartment.
  1. Open the rear compartment.
  2. Remove rear compartment lid carpet. Refer to «Compartment Lid Trim Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end)
  3. Disconnect all of the electrical connectors to the electrical components that are attached to the lid.
  4. Tie a string to the rear compartment lid wire harness. Ensure that the string is long enough to allow you to feed the harness back through the rear compartment lid.
  5. Pull the harness wire out of the rear compartment lid and remove the string.
  6. Remove the push-in retainer from the hinge.
  7. Loosen the rear compartment trim as required to access the rear compartment lid harness.
  8. Disconnect the harness in the rear compartment.
  9. Remove the harness.
  1. Connect the harness in the rear compartment.
  2. Connect the new harness to the string.
  3. Pull the string back through the rear compartment lid until the harness is inside of the rear compartment lid.
  4. Remove the string from the wire harness.
  5. Connect the electrical connectors to the electrical components that are attached to the rear compartment lid.
  6. Install the push-in retainer on the hinge.
  7. Install rear compartment carpet. Refer to «Compartment Lid Trim Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end)
  8. Close the rear compartment.
  1. Open the rear compartment.
  2. Remove the rear bumper fascia. Refer to «Fascia, Bracket, Bar, Absorber Replacement - Rear Bumper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#bumper-system) in Bumpers.
  3. Pull back the right rear compartment trim panel as needed. Refer to «Compartment Trim Panel Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Use a small, flat-bladed tool to release the snaps on the pressure relief valve. Apply pressure at two upper locations and two lower locations.
  5. Remove the pressure relief valve from the lower quarter panel.
  1. Install the pressure relief valve in the lower quarter panel.
  2. Press the pressure relief valve into the quarter lower panel until the snaps lock into place at the upper and lower locations.
  3. Install the rear compartment trim panel. Refer to «Compartment Trim Panel Replacement - Rear»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#body-rear-end) .
  4. Install the rear bumper fascia. Refer to «Fascia, Bracket, Bar, Absorber Replacement - Rear Bumper»(/buick/lacrosse/i-2004-2009/remont/exterior-body-panels/#bumper-system) in Bumpers.
  5. Close the rear compartment.

Scheme 6

Scheme 6: Weatherstrip Replacement - Rear Compartment Opening
Scheme 6: Weatherstrip Replacement - Rear Compartment Opening
CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Weatherstrip, Rear Compartment

Weatherstrip Replacement - Rear Compartment Opening

Rear Compartment Lid Release

The rear compartment lid can be released by depressing and holding either front power door lock switch to the unlock position for a minimum of 2 seconds or by pressing the rear compartment release button on the key fob. The transmission must be in the PARK position for the rear compartment to release.

Special Tools

Special Tools Illustration Tool Number/Description J 38778 Door Trim Pad Clip Remover

Scheme 7

Scheme 7: Special Tools
Scheme 7: Special Tools

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