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Power Roof System Buick LaCrosse I

Sun Roof/t-Top/convertible Top 4 illustrations ~3042 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Sunroof Actuator Screws3 N.m27 lb in
Sunroof Module to Roof Bolts10 N.m89 lb in
Sunroof Opening Position Switch Screw2 N.m18 lb in
Sunshade Stop Screws2 N.m18 lb in
Sunroof Window Panel Screws4 N.m35 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Power Sunroof Schematics
Scheme 1: Power Sunroof Schematics

Scheme 2

Scheme 2: Power Roof Systems Component Views
Scheme 2: Power Roof Systems Component Views
CalloutComponent Name
1C398
2Sunroof Motor/Actuator

Sunroof Switch Connector Part Information OEM: 12124997 Service: See Catalog 5-Way F Metri-Pack 150 Series Right Angle (BK) Pin Wire Color Circuit No. Function A - - Not Used B D-BU 128 Sunroof Switch Low Reference C - - Not Used D OG 110 Sunroof Switch Close Signal E BN 100 Sunroof Switch Open Signal

Sunroof Motor Connector Part Information OEM: 15383398 (Yazaki) Service: See Catalog 10-Way F 1.5 280 Series, Unsealed (GY) Pin Wire Color Circuit No. Function 1 BK 750 Ground 2 D-BU 128 Sunroof Switch Low Reference 3 YE 643 Accessory Voltage 4 - - Not Used 5 BN 100 Sunroof Switch Open Signal 6 YE 643 Accessory Voltage 7-9 - - Not Used 10 OG 110 Sunroof Switch Close Signal

Scheme 3

Scheme 3: Power Sunroof Disassembled View
Scheme 3: Power Sunroof Disassembled View
CalloutComponent Name
1Sunroof Window Bolt/Screw
2Sunroof Window Panel
3Sunroof Module Assembly Bracket Bolt
4Sunroof Window Guide Bumper
5Sunroof Sunshade Stop
6Sunroof Sunshade Stop Screw
7Sunroof Module Assembly Bracket
8Sunroof Module Assembly Bracket Nut
9Sunroof Module Assembly
10Sunroof Module Assembly Bolt
11Sunroof Sunshade
12Sunroof Opening Bezel/Lace
13Sunroof Switch Bezel
14Sunroof Switch
15Sunroof Wiring Harness
16Sunroof Actuator/Motor Bolt/Screw
17Sunroof Control Module
18Sunroof Actuator/Motor
19Sunroof Opening Position Switch
20Sunroof Opening Position Switch Screw

Diagnostic Starting Point - Roof

Begin the system diagnosis by reviewing the Diagnostic System Check - Vehicle in Vehicle DTC Information. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Roof in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Symptoms - Roof

IMPORTANTReview the system operation in order to familiarize yourself with the system functions. Refer to Sunroof Description and Operation (1 Connector System) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Power Sunroof 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.
  3. Inspect for mechanical binding.

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 the symptom diagnostic procedure Power Sunroof Inoperative (1 Connector System) in order to diagnose the symptom.

Diagnostic Aids

The sunroof motor and sunroof module are integral parts of an assembly and are not serviced separately.

If voltage is not measured on the sunroof switch open signal or sunroof switch close signal circuits, the fault could be in the accessory voltage circuit, battery positive voltage circuit, or sunroof motor/module ground circuit. If the sunroof motor/module is not being powered, neither will the sunroof switch signal circuits.

StepActionValuesYesNo
Schematic Reference: Power Sunroof Schematics Connector End View Reference: Power Roof Systems Connector End Views DEFINITION: This diagnostic procedure is to be used for the one connector sunroof system that combines the sunroof control module with the sunroof motor/actuator.
1Did you perform the Diagnostic System Check - Vehicle?Go to Step 2Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2Attempt to operate the sunroof through its full range of functions in order to verify that the power sunroof inoperative fault is present. Does the power sunroof system operate normally?Go to Testing for Intermittent Conditions and Poor Connections in Wiring SystemsGo to Step 3
3Perform the sunroof re-initialization. Refer to Sunroof Control Module Programming and Setup (One Connector System) in Programming and Setup. Does the sunroof operate normally?Go to Step 17Go to Step 4
4Disconnect the sunroof motor/actuator connector. Measure the voltage at both of the accessory voltage circuit to ground. Does the voltage measure between the specified value at both locations?9-16 VGo to Step 5Go to Step 13
5Turn OFF the ignition. Measure the resistance of the ground circuit of the sunroof motor/actuator. Does the resistance measure less than or equal to the specified value?5 ohmsGo to Step 6Go to Step 14
6Reconnect the sunroof motor/actuator connector. Disconnect the sunroof switch. Measure the resistance of the sunroof switch low reference circuit. Does the resistance measure less than or equal to the specified value?5 ohmsGo to Step 7Go to Step 10
7Is the sunroof in the fully closed position?Go to Step 8Go to Step 9
8Connect a 3-amp fused jumper wire to the low reference circuit of the sunroof switch harness connector. Turn ON the ignition, with the engine OFF. Connect the other end of the 3-amp fused jumper wire to the sunroof switch open signal circuit of the sunroof switch harness connector for 3 seconds. Did the sunroof open?Go to Step 15Go to Step 11
9Disconnect the sunroof switch. Turn ON the ignition, with the engine OFF. Connect a 3-amp fused jumper wire to the low reference circuit of the sunroof switch harness connector. Connect the other end of the 3-amp fused jumper wire to the sunroof switch close signal circuit of the sunroof switch harness connector for 3 seconds. Did the sunroof close?Go to Step 15Go to Step 12
10Test for an open or a poor connection in the sunroof switch low reference circuit. 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 17Go to Step 16
11Test the sunroof switch close signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 17Go to Step 16
12Test the sunroof switch open signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?Go to Step 17Go to Step 16
13Repair a poor connection or an open in the accessory voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?Go to Step 17
14Repair a poor connection or an open in the ground circuit of the sunroof motor/actuator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?Go to Step 17
15Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement?Go to Step 17
16Replace the sunroof motor/actuator. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair?Go to Step 17
17Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Power Sunroof Inoperative (1 Connector System)

Power Sunroof Does Not Close

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle or any time an existing sunroof motor actuator is removed from the vehicle. Refer to Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor) or Sunroof Motor/Actuator Initialization/Teach Process (New Motor) .

Power Sunroof Window is Skewed

Parallel positioning of the window track guides or lift mechanism and cable is crucial to the proper function of the system. If the guides are misaligned, refer to Sunroof Track Timing/Synchronization (PES) .

Power Sunroof When Operated from Vent to Close One Side Will Drop Before the Other

Parallel positioning of the window track guides or lift mechanism and cable is crucial to the proper function of the system. If the guides are misaligned, refer to Sunroof Track Timing/Synchronization (PES) .

Power Sunroof When Closing from the Vent Position the Window Will Reverse Direction

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle or any time an existing sunroof motor actuator is removed from the vehicle. Refer to Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor) or Sunroof Motor/Actuator Initialization/Teach Process (New Motor) .

Power Sunroof Will Stop at the Wrong Location

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle or any time an existing sunroof motor actuator is removed from the vehicle. Refer to Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor) or Sunroof Motor/Actuator Initialization/Teach Process (New Motor) .

Power Sunroof Will Over Travel the Open Position and Stall the Motor

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle or any time an existing sunroof motor actuator is removed from the vehicle. Refer to Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor) or Sunroof Motor/Actuator Initialization/Teach Process (New Motor) .

Power Sunroof Will Over Travel the Close Position and Stall the Motor

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle or any time an existing sunroof motor actuator is removed from the vehicle. Refer to Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor) or Sunroof Motor/Actuator Initialization/Teach Process (New Motor) .

Sunroof Window Height and Opening Fit Adjustment

  1. Slide the sunroof sunshade to the open position.
  2. Adjust the sunroof to the fully closed position.
  3. Loosen the sunroof window panel screws.
  4. Individually adjust the 4 corners of the sunroof window panel.
  5. Adjust the front of the sunroof window panel to 0.5 mm (0.020 in) below the top surface (3) of the roof panel.
  6. Adjust the rear of the sunroof window panel to 0.5 mm (0.020 in) above the top surface (2) of the roof panel.
  7. Tighten the sunroof window panel screws. Tighten: Tighten the sunroof window panel screws to 4 N.m (35 lb in).
  8. Close the sunshade.

Removal Procedure

  1. Remove the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) .
  2. Disconnect the electrical connector from the motor/actuator.
  3. Remove the motor/actuator. Refer to «Sunroof Motor/Actuator Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  4. Remove the screw that attaches the control module.
  5. Install a pin temporarily in the holes to hold the position while installing the drive motor.
  6. Remove the sunroof window. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  7. Manually slide the mechanism forward in the track until the mechanism reaches the hard stop.
  8. Push the cam assembly (2) forward until the timing hole (3) in the cam is aligned with the timing hole (4) in the lifter arm (1).
  9. Repeat this procedure for the opposite side.

Installation Procedure

  1. Install the sunroof window. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) . Tighten: Tighten the screws to 4 N.m (35 lb in).
  2. Install the control module.
  3. Install the motor/actuator. Refer to «Sunroof Motor/Actuator Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  4. Remove the pin that was installed to temporarily hold the position of the sunroof opening position switch. Tighten: Tighten the motor attachment screws to 3.5 N.m (31 lb in).
  5. Connect the electrical connector to the motor/actuator.
  6. Install the headliner. IMPORTANT: If the sunroof does not function properly, and the guides are parallel, then replace the sunroof opening switch.
  7. Verify the operation of the sunroof.

Drain Hose Routing

A drain trough encircles the sunroof window panel and water is drained off by the drain hoses located at each corner of the housing. A drain channel spans across the sunroof module at the rear of the window panel and directs water into the trough.

  1. Check to ensure the front drain hoses are routed down the windshield pillars and out the center of the pillar between the door hinges. Make sure the hoses are not kinked.
  2. Check to ensure the rear drain hoses are routed through the rear pillars and out of the rocker panel. Make sure the rear hoses are properly routed in the metal roof slot and taped in place.

Plugged Drain Hose

If a waterleak has occurred check for a plugged drain hose at each corner of drainage system.

  1. Open the sunroof window.
  2. To test for blockage, pour a small container of water into the module housing drain trough. Check each corner to confirm the drain hose is draining water.
  3. Use compressed air, 241 kpi (35 psi) or less to blow out any drain hose that is plugged.
  4. Test the system again.
  5. If the hose remains plugged, check to see it is properly routed and does not have a kink. Refer to «Drain Hose Routing»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__drain-hose-routing) .
  6. Remove the blockage using the following steps. Push mechanics wire through the hose to remove the obstruction. Use compressed air in order to blow out any remaining material.

Disconnected Drain Hose

Inspect the drainage system for disconnected drain hoses. Complete the following steps in order to obtain partial access to drain hoses and check for a disconnected hose.

  1. Open the sunroof window panel.
  2. Lower the headliner as needed. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  3. Connect any disconnected hoses.
  4. Ensure that the rear drain hoses are properly routed in the metal roof slot and taped in place.
  1. Remove the sunroof window panel from the sunroof module. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  2. Fully close the sunshade.
  3. From the top of the vehicle, use your thumbs to push the sunshade retainers towards the center of the vehicle.
  4. Lift upward and slightly forward on the sunshade to clear the rear brace.
  5. Remove the sunshade from the sunroof module.
  1. From the outside of the vehicle, install the front of one side of the sunshade retainers into the sunshade track.
  2. Lower the sunshade to clear the rear brace then install the rear retainer into the track.
  3. While pushing in the sunshade retainers push down and position the opposite side retainers into sunshade track.
  4. Inspect the sunshade for proper operation.
  5. Install the sunroof window panel. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  1. Position the sunshade panel fully rearward.
  2. Position the sunroof window panel to the vent position.
  3. Remove the sunroof window panel screws from the sunroof window panel.
  4. Remove the sunroof window panel from the sunroof module.
  1. Position the sunroof window panel to the sunroof module. Ensure that the information logo stencil is towards the rear of the sunroof opening.
  2. Install the sunroof window panel screws to the sunroof window panel. Tighten: Tighten the sunroof window panel screws to 4 N.m (35 lb in).
  3. Adjust the sunroof window panel as necessary. Refer to «Sunroof Window Height and Opening Fit Adjustment»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__sunroof-window-height-and-opening-fit) .
  4. Inspect the sunroof window panel for proper operation.

Scheme 4

Scheme 4: Sunroof Switch Replacement
Scheme 4: Sunroof Switch Replacement
CalloutComponent Name
NOTE: Refer to Fastener Notice in Cautions and Notices. Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Lens, Overhead Console Lamp Lens
2Screws, Overhead Console Bezel (Qty: 2) Tighten: 3 N.m (40 lb in)
3Bezel, Overhead Console
4Switch, Sunroof Position Tip: Disconnect the electrical connector.
NOTE
Refer to Fastener Notice in Cautions and Notices.

Sunroof Switch Replacement

Tools Required

J 41718 Sunroof Timing Pins. See Special Tools .

  1. Position the sunroof window panel to the fully closed position.
  2. Remove the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  3. Remove the right and left front screw from the sunroof window panel. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  4. Install into the front sunroof window panel screw hole to retain the cable adjustment.
  5. Disconnect the electrical connector from the sunroof module actuator.
  6. Remove the bolts (1) from the .
  7. Remove the sunroof actuator from the sunroof module.
  1. Install the sunroof actuator screw (1) to the sunroof module.
  2. Install the sunroof actuator bolts. Tighten: Tighten the sunroof actuator bolts to 4 N.m (35 lb in).
  3. Connect the electrical connector to the sunroof actuator.
  4. Remove the J 41718 . See «Special Tools»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__special-tools) .
  5. Install the front screws to the sunroof glass panel. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  6. Perform the Initialization/Teach Procedure. Refer to «Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor)»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__sunroof-motoractuator-initializationteach-process-existing-m) or «Sunroof Motor/Actuator Initialization/Teach Process (New Motor)»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__sunroof-motoractuator-initializationteach-process-new-motor) .
  7. Inspect for proper operation of the sunroof.
  8. Install the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.

Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor)

Perform the Initialization/Teach Process any time the sunroof motor/actuator is removed from the sunroof.

  1. Ensure that the electrical harness on the headliner is connected to the sunroof.
  2. Press the sunroof switch to the close position until the window stops at the front soft stop in the fully closed position. Release the switch.
  3. Press the close position again. Hold the switch for at least 13 Seconds. The sunroof will stall at the hard stop, then move slightly back to the soft stop position. Release the switch.
  4. Verify the operation of the sunroof.
IMPORTANTThe Initialization/Teach Process is not complete if any of the following actions take place before the initialization cycle is done: The sunroof switch is not held in the close position. The ignition and/or battery power has been removed. The glass panel has not reached the closed position. The Initialization/Teach Process must be restarted if the procedure is not carried out completely.

Sunroof Motor/Actuator Initialization/Teach Process (New Motor)

Perform the Initialization/Teach Process any time a new sunroof motor actuator is installed in the vehicle.

  1. Ensure that the electrical harness on the headliner is connected to the sunroof.
  2. Press the sunroof switch to the close position until the window stops at the front hard stop in the fully closed position, then moves slightly back to the soft stop position. Release the switch.
  3. Verify the operation of the sunroof.
IMPORTANTThe Initialization/Teach Process is not complete if any of the following actions take place before the initialization cycle is done: The sunroof switch is not held in the close position. The ignition and/or battery power has been removed. The glass panel has not reached the closed position. The Initialization/Teach Process must be restarted if the procedure is not carried out completely.
  1. Position the sunshade in the full forward position.
  2. Remove the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  3. Remove the rear shelf. Refer to «Trim Panel Replacement - Rear Window Shelf»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  4. Cut the nylon tie straps on the express module and the drive cable tube.
  5. Disconnect the electrical connectors from the following components: The sunroof control switch The sunroof control module The sunroof actuator The sunroof opening position switch
  6. Remove the tape holding the wire harness to the sunroof module.
  7. Remove the wire harness from the sunroof.
  1. Align the wire harness to the sunroof module.
  2. Connect the electrical connectors to the following components: The sunroof control switch The sunroof control module The sunroof actuator The sunroof opening position switch
  3. Install new nylon tie straps to the sunroof control module and the drive cable tube.
  4. Install new tape to hold the wire harness to the module.
  5. Inspect for proper operation of the sunroof.
  6. Install the rear shelf. Refer to «Trim Panel Replacement - Rear Window Shelf»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  7. Install the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  1. The old sunroof window and sunshade will need to be installed to the new sunroof module assembly.
  2. Remove the sunroof window. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  3. Remove the sunshade panel. Refer to «Sunroof Sunshade Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  4. Remove the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  5. Disconnect the electrical connector from the sunroof module.
  6. Disconnect the front and rear drain hoses from the sunroof module.
  7. Have an assistant support the sunroof module.
  8. Remove the bolts from the sunroof module.
  9. Remove the sunroof module from the vehicle with an assistant.
  1. Position the sunroof module to the vehicle roof with an assistant.
  2. Install the sunroof module bolts. Tighten: Tighten the sunroof module bolts to 10 N.m (89 lb in).
  3. Connect the front and rear drain hoses to the sunroof module.
  4. Connect the electrical connector to the sunroof module.
  5. Install the sunshade panel. Refer to «Sunroof Sunshade Panel Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  6. Install the sunroof window. Refer to «Sunroof Window Replacement»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  7. Perform the Initialization/Teach Procedure. Refer to «Sunroof Motor/Actuator Initialization/Teach Process (Existing Motor)»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__sunroof-motoractuator-initializationteach-process-existing-m) or «Sunroof Motor/Actuator Initialization/Teach Process (New Motor)»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system__sunroof-motoractuator-initializationteach-process-new-motor) .
  8. Inspect for proper operation of the sunroof. Refer to «Sunroof Description and Operation (1 Connector System)»(/buick/lacrosse/i-2004-2009/remont/sun-rooft-topconvertible-top/#power-roof-system) .
  9. Install the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  1. Pull inward on the sunroof opening trim bezel to release the tabs from the sunroof opening.
  2. Remove the sunroof opening trim bezel from the headliner.
  1. Position the back of the sunroof opening trim bezel to the headliner.
  2. Press the sunroof opening trim bezel to the headliner until the tabs are fully seated.
  1. Remove the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
  2. Remove the sunshade stop screw from the sunshade track.
  3. To remove the sunshade stop, press the sunshade stop locking tab in and slide sunshade stop out of the sunshade track.
  1. Position the sunshade stop to the sunshade track.
  2. Press the sunshade stop into the sunshade track until fully seated.
  3. Install the sunshade stop screw to the sunshade track. Tighten: Tighten the sunshade stop screw to 2 N.m (18 lb in).
  4. Install the headliner. Refer to «Headliner Replacement»(/buick/lacrosse/i-2004-2009/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.

Sunroof

This diagnostic procedure is to be used for the 1 connector Sunroof System that combines the sunroof control module with the sunroof motor/actuator.

The Sunroof System consists of the following components

  1. BATT MAIN 2 Fuse 50 A
  2. Body control module (BCM)
  3. RAP relay
  4. S/Roof Fuse 20 A
  5. Sunroof module (includes sunroof motor/actuator)
  6. Sunroof switch

The Sunroof System is controlled by the sunroof switch and the sunroof motor/actuator assembly.

When the ignition is turned to RUN or ACCESSORY, or when the retained accessory power (RAP) system is active, the body control module (BCM) applies a ground to the RAP relay in the instrument panel (I/P) fuse block. This activates the RAP relay and allows battery positive voltage to be applied through the SUNROOF Fuse to the sunroof module. Ground for the sunroof module is supplied from G302.

The sunroof can be placed in 3 preset positions

  1. Open
  2. Vent
  3. Closed

When the sunroof switch is placed in the OPEN position, a ground is applied from the sunroof switch low reference circuit, through the sunroof switch and to the sunroof switch open signal circuit. The sunroof motor/actuator then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the full open position.

When the sunroof switch is placed in the VENT position, a ground is applied from the sunroof switch low reference circuit, through the sunroof switch and to the sunroof switch open signal circuit. The sunroof module then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the VENT position.

When the sunroof switch is placed and held in the CLOSED position, a ground is applied from the sunroof switch low reference circuit, through the sunroof switch and to the sunroof switch close signal circuit. The sunroof module then applies voltage to the sunroof motor close control circuit and applies a ground to the sunroof motor open circuit. The sunroof motor then closes the sunroof.

The sunroof can be placed in any preferred open position when

  1. The sunroof is in the fully opened position by pressing and holding the sunroof switch in the CLOSE position until the panel has reached the desired position then release the CLOSE switch in order to stop the sunroof
  2. The sunroof is opening, it can be stopped by momentarily pressing either side of the switch.

The sunroof control module, sun roof actuator, and the sunroof motor are integral parts of the sunroof module assembly and are not service separately.

Special Tools

Special Tools Illustration Tool Number/Description J 41718 Sunroof Timing Pins