Sunroof System Buick Century VI

Specifications

Fastener Tightening Specifications

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Scheme 7

Diagnostic Starting Point - Roof

Begin the system diagnosis with the DIAGNOSTIC SYSTEM CHECK - POWER SUNROOF . 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.

Symptoms

When no DTCs are present, begin symptom diagnosis by reviewing the SUNROOF DESCRIPTION AND OPERATION . 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 the SYMPTOMS - ROOF in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
3. 6. The presence of either of these codes would indicate an internal module malfunction with the Body Control Module (BCM), inhibiting the operation of the sunroof.
4. 7. The presence of either of these DTCs will inhibit the battery supply voltage to operate the sunroof system.

Scheme 8

Symptoms - Roof

1. Perform «DIAGNOSTIC SYSTEM CHECK - POWER SUNROOF»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) before using the Symptom Tables in order to verify that all of the following conditions are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to learn the system functions. Refer to «SUNROOF DESCRIPTION AND OPERATION»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system__sunroof-description-and-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which can affect the operation of the Power Sunroof system. Refer to CHECKING AFTERMARKET ACCESSORIES in Wiring Systems.
2. Inspect the accessible system components for obvious damage or for conditions which can cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.

Symptom List

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

1. «POWER SUNROOF INOPERATIVE»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system)
2. «POWER SUNROOF DOES NOT OPEN»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system)
3. «POWER SUNROOF EXPRESS OPEN FEATURE INOPERATIVE»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system)
4. «POWER SUNROOF DOES NOT OPEN TO VENT POSITION»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system)
5. «RETAINED ACCESSORY POWER (RAP) ON AFTER TIMEOUT»(/buick/century/vi-1997-2005/remont/accessories-control-systems/#retained-accessory-power) , if the sunroof should continue to operate for more than 10 minutes after the ignition has been turned OFF.

The numbers below refer to the step numbers on the diagnostic table.

1. 5. Using a jumper wire to simulate operation of the sunroof to determine if the switch is at fault.
2. 13. Disconnecting the sunroof limit switch/sunroof opening position switch harness connector and shorting the sunroof limit switch position 1-LS1 circuit, the sunroof module thinks the glass is in the closed position, allowing any request from the sunroof switch to enable an output to the sunroof motor/actuator for testing.
3. 14. When the sunroof control module is at rest the sunroof motor/actuator open and close circuits are at ground potential. This step is testing for an output to drive the motor, when the sunroof control module should be idle.

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Scheme 13

The numbers below refer to the step numbers on the diagnostic table.

1. 2. This step will test the if the sunroof will slide to the open position. If it opens, then inspect the sunroof limit switch position-LS2 for a stuck switch causing an intermittent short to ground.
2. 4. Testing for a short to ground in the sunroof limit switch position 2-LS2 circuit or a stuck/closed limit switch.

Scheme 14

The number below refers to the step number on the diagnostic table.

1. 2. This step will test the express open feature and if the feature is operating properly, then inspect the limit switch low reference circuit for a poor condition or intermittent.

Scheme 15

The numbers below refer to the step numbers on the diagnostic table.

1. 2. This step will test for an intermittent condition when testing whether the sunroof will slide and soft stop in vent position. If the sunroof operates properly to the full vent position, then inspect the sunroof limit switch position 1-LS1 for a stuck switch causing an intermittent short to ground.
2. 4. Testing for a short to ground in the sunroof limit switch position 1-LS1 circuit or a stuck/closed limit switch.

Scheme 16

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. NOTE: 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.
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 parking brake pedal assembly, if replacing the left front sunroof drain hose. Refer to Park Brake Pedal Assembly Replacement in Park Brake.
2. Remove the front carpet retainers. Refer to CARPET RETAINER REPLACEMENT - FRONT in Interior Trim.
3. Pull the front carpet back to gain access to the hole in the front door hinge pillar.
4. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim. IMPORTANT: Note the routing of the sunroof drain hose before removing.
5. Disconnect the front drain hose from the sunroof module spigot.
6. Tie a string to the module end of the sunroof drain hose to aid in the installation process.
7. Remove the front sunroof drain hose grommet from the hole in the front door hinge pillar.
8. Remove the front sunroof drain hose from the front door hinge pillar. Pull the sunroof drain hose from the front door hinge pillar, allowing the string to remain in the pillar.
9. Remove the string from the drain hose.

Installation Procedure

1. Tie the string to the new sunroof drain hose at the sunroof module.
2. Install the front sunroof drain hose, by pulling the string from the front door hinge pillar access hole and routing it through the front door hinge pillar.
3. Remove the string from the front sunroof drain hose.
4. Install the end of the front sunroof drain hose to the grommet in the front door hinge pillar.
5. Connect the front sunroof drain hose to the spigot on the sunroof module.
6. Inspect the front sunroof drain hose for proper routing.
7. Push the front carpet back to its original position.
8. Install the front carpet retainers. Refer to CARPET RETAINER REPLACEMENT - FRONT in Interior Trim.
9. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
10. Install the parking brake pedal assembly, if removed. Refer to Park Brake Pedal Assembly Replacement in Park Brake.

1. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
2. Remove the rear sunroof drain hose from the sunroof module spigot.
3. Remove the rear sunroof drain hose from the rear pillar.
4. Remove the rear sunroof drain hose from the drain tube at the base of the rear pillar.
5. Remove the rear sunroof drain hose from the vehicle.

1. Install the rear sunroof drain hose to the vehicle.
2. Install the rear sunroof drain hose to the drain tube at the base of the rear pillar.
3. Install the sunroof drain hose to the rear pillar.
4. Press the rear sunroof drain hose onto the sunroof rear drain spigot
5. Ensure that the rear drain hoses are properly routed in the metal roof slot and are taped in place.
6. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.

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. Replace any torn or cracked hose. Refer to «SUNROOF DRAIN HOSE REPLACEMENT - FRONT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
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. Replace any torn or cracked hose. Refer to «SUNROOF DRAIN HOSE REPLACEMENT - REAR»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .

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. CAUTION: Wear safety glasses in order to avoid eye damage.
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/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system__drain-hose-routing) .
6. Remove any hoses that remain plugged. For front hoses, refer to «SUNROOF DRAIN HOSE REPLACEMENT - FRONT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) For rear hoses, refer to «SUNROOF DRAIN HOSE REPLACEMENT - REAR»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system)
7. Remove the blockage using the following steps. 7.1. Push mechanics wire through the hose to remove the obstruction. 7.2. Use compressed air in order to blow out any remaining material. 7.3. Reinstall the hose. Refer to «DRAIN HOSE ROUTING»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system__drain-hose-routing) .

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 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. Refer to «SUNROOF WINDOW REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
2. Remove the screws (1) from the rear water trough.
3. Rotate the trough toward the rear to remove it from the hold down.
4. Remove the water trough.
5. Remove the sunshade by bowing the sunshade in the center and pushing the sunshade to one side to allow the opposite side to be lifted out of the sunshade channel.
6. Remove the sunshade from the sunroof module.

1. Position the sunshade to the sunroof module
2. Insert one side into the guide channel on the sunroof module.
3. Push the sunshade up so that it bows and the other side can be positioned into the opposite guide channel.
4. Slide the sunshade forward and backward to check for smooth operation.
5. Position the water trough in the hold downs and rotate it toward the front. NOTE: 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.
6. Install the screws (1) on the rear water trough. Tighten Tighten the screws to 2 N.m (18 lb in).
7. Install the sunroof window. Refer to «SUNROOF WINDOW REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-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. NOTE: 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.
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/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system__sunroof-window-height-and-opening-fit) .
4. Inspect the sunroof window panel for proper operation.

1. Remove the sunroof window panel. Refer to «SUNROOF WINDOW REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
2. Remove the sunroof window seal from the sunroof window panel frame by pulling the sunroof window seal away at one point and continuing around the perimeter of the sunroof window panel frame.
3. Wipe the perimeter of the sunroof window panel frame area with a clean, dampened cloth using window cleaner GM P/N 1050427 (Canadian P/N 992727), or isopropyl alcohol in order to clean the surface of the perimeter of the sunroof window panel frame. Allow to air dry.

1. Position the sunroof window panel seal onto the sunroof window panel frame. IMPORTANT: Ensure that the sunroof window seal is properly seated around the entire perimeter of the sunroof window panel frame.
2. Firmly press the sunroof window seal into place. A small rubber hammer will help in the installation.
3. Install the sunroof window panel. Refer to «SUNROOF WINDOW REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .

1. Grasp the switch on the left and right sides. IMPORTANT: The switch must be rotated, pulled down on the left side, to be removed.
2. Use 2 small, flat-bladed tools to disengage the clips which are located at the front and rear of the switch. Hold the flat-bladed tools parallel to the roof and push straight in.
3. Rotate the switch toward the left side to disengage it from the mounting bracket and pull down.
4. Disconnect the electrical connector from the switch.
5. Remove the switch from the vehicle.

1. Connect the electrical connector to the switch.
2. Push the switch into the bracket until fully seated.

1. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
2. Remove the tie strap from the wiring harness.
3. Remove the sunroof actuator screws (1).
4. Disconnect the sunroof actuator harness from the control module harness.
5. Pull the actuator straight down to disengage the drive gear.
6. Remove the actuator from the sunroof.

1. Position the actuator (1) to the sunroof.
2. Push the actuator straight in. This will engage the drive gear into the Sunroof Opening Position Switch. NOTE: 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.
3. Install the sunroof actuator screws. Tighten Tighten the sunroof actuator screws to 3 N.m (27 lb in).
4. Connect the sunroof actuator harness to the control module harness.
5. Install the tie strap to the wiring harness.
6. Check the operation of the sunroof to all positions.
7. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.

1. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
2. Remove the nylon tie straps located at both ends of the sunroof control module (2)
3. Disconnect the electric connectors at both ends of the control module.
4. Release the module retainers from the metal bracket by sliding the control module toward the left side of the vehicle.
5. Remove the control module from the sunroof.

1. Position the control module to the sunroof.
2. Connect both electrical connectors to the ends of the control module.
3. Install the control module to the sunroof module by sliding it to the right to engage the retainers.
4. Install the nylon tie straps at both ends of the control module (2)
5. Check the operation of the sunroof to all positions.
6. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.

1. Position the sunshade in the full forward position.
2. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
3. Remove the rear shelf. Refer to TRIM PANEL REPLACEMENT - REAR WINDOW SHELF in Interior Trim.
4. Cut the nylon tie straps on the sunroof control module and the drive cable tube.
5. Disconnect the electrical connectors from the sunroof control module.
6. Disconnect the electrical connector to the body harness located under the rear shelf.
7. Disconnect the electrical connector from the Sunroof Opening Position Switch.
8. Disconnect the electrical connector from the sunroof actuator.
9. Remove the tape holding the wire harness to the module.
10. Remove the wire harness from the sunroof.

1. Align the wire harness to the sunroof module.
2. Connect the electrical connectors to the Sunroof Opening Position Switch.
3. Connect the electrical connector to the body harness.
4. Connect the electrical connector to the sunroof control module.
5. Install new nylon tie straps to the control module and the drive cable tube.
6. Install new tape to hold the wire harness to the module.
7. Connect the electrical connector to the control switch.
8. Check for proper operation of the sunroof.
9. Install the rear shelf. Refer to TRIM PANEL REPLACEMENT - REAR WINDOW SHELF in Interior Trim.
10. Install the headliner. Refer to HEADLINER REPLACEMENT 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 sunshade panel. Refer to «SUNROOF SUNSHADE PANEL REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
3. Remove the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.
4. Disconnect the sunroof harness from the body harness at the right rear pillar.
5. Disconnect the front drain hose connections from the sunroof housing.
6. Disconnect the rear drain hose connections from the sunroof housing.
7. Remove the 4 sunroof module bracket to side rail bolts.
8. Remove the 6 sunroof module to roof bolts.
9. Remove the sunroof module at the actuator bracket bolt (center rear). IMPORTANT: Use two white nylon locator pins in order to correctly position the sunroof module and temporarily hold the module in place.
10. Squeeze the locator pins and pull down on the sunroof module to disengage the two locator/retainers.
11. Remove the sunroof module from the vehicle through the door opening.

1. Position the sunroof module in the vehicle. Press up to install the two white nylon locator/retainers. NOTE: 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.
2. Install the sunroof module actuator bracket bolt. Tighten Tighten the bolt to 10 N.m (89 lb in).
3. Install the 6 sunroof module to roof bolts. Tighten Tighten the bolts to 10 N.m (89 lb in).
4. Install the 4 sunroof module bracket to side rail bolts. Tighten Tighten the bolts to 10 N.m (89 lb in).
5. Connect the front and rear drain hoses to the sunroof housing.
6. Properly route the rear hoses in the metal roof slot and tape the hoses in place.
7. Connect the sunroof harness to the body harness at the right rear pillar.
8. Install the sunroof sunshade panel. Refer to «SUNROOF SUNSHADE PANEL REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
9. Temporarily install the power sunroof switch and check the operation of the sunroof.
10. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.

1. Remove the headliner. Refer to HEADLINER REPLACEMENT 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. NOTE: 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.
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 in Interior Trim.

Tools Required

J 41718 Sunroof Timing Pins

Scheme 17

1. Position the sunroof window panel to the closed position.
2. Remove the sunroof module from the vehicle. Refer to «SUNROOF MODULE ASSEMBLY REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) . IMPORTANT: Before removing the SOPS from the sunroof module, the J 41718 sunroof timing pins must be installed to lock the cable/cam mechanism into position.
3. The cable/cam mechanisms, on both sides of the sunroof window, contain a set of timing holes. These holes are aligned to the sunroof window panel in the CLOSED position. Remove the left and right side front sunroof window panel screws. Align the timing holes. Use a flat-bladed tool to push the cable/cam mechanism forward or rearward. Install the J 41718 sunroof timing pins into the left and right sunroof window panel screw holes.
4. Remove the sunroof actuator. Refer to «SUNROOF MOTOR/ACTUATOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
5. Disconnect the electrical connector from the SOPS (3).
6. Remove the SOPS screw (2) from the switch.
7. Hold down on both drive cables, and lift straight up to remove the SOPS from the sunroof module.

Scheme 18

1. Keeping the position lock pin in the new SOPS, position the SOPS switch over the drive cables and press down. If the SOPS does not slide into position, the ridges on the drive cable housings will not go into the grooves on the back of the SOPS. Lift each cable into the SOPS, and press down on the SOPS assembly. NOTE: 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.
2. Install the Sunroof opening Position Switch screw (2) to the switch. Tighten Tighten the SOPS screw to 2 N.m (18 lb in).
3. Connect the electrical connector to the SOPS.
4. Install the sunroof actuator. Refer to «SUNROOF MOTOR/ACTUATOR REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
5. Remove the position lock pin (1) or the 2 wires from the switch.
6. Remove the 2 pins from the cable/cam mechanisms.
7. Install the left and right front sunroof window panel screws. Tighten Tighten the front sunroof window panel screws to 4 N.m (35 lb in).
8. Install the sunroof module, but do not install the headliner until after you have tested the sunroof operation. Refer to «SUNROOF MODULE ASSEMBLY REPLACEMENT»(/buick/century/vi-1997-2005/remont/sun-rooft-topconvertible-top/#sunroof-system) .
9. Inspect the operation of the sunroof.
10. Install the headliner. Refer to HEADLINER REPLACEMENT in Interior Trim.

Sunroof Description and Operation

The power sunroof (CF5 option) has the following features

1. A manually operated sunshade. A recess is provided in the sunshade to be used to push the shade open or pull it shut.
2. An express module at the front of the sunroof control module, allows the window panel to stop in the closed, vent and fully open positions.
3. The Sunroof Opening Position Switch (SOPS) contains the limit switches for the window panel operation. Its gearing drives the window into the desired position. The window panel must be in the closed position when this unit is replaced.
4. The sunroof motor actuator attaches to the SOPS and contains the driveshaft that drives the gearing in the SOPS. This driveshaft will turn infinitely in both directions.
5. The power sunroof switch is a two position rocker type switch which electrically operates the power sunroof. The switch is located in the headliner in front of the sunroof. Press and hold the front indent position to move the sunroof glass to the vent position. Press and hold rear indent and the sunroof will return to the full closed position. Press rear indent once and the sunroof glass will slide to the full open position automatically (express open). Press and hold the front indent position on the control switch in order to close the sunroof window from the open position. The switch must be held until the window reaches a desired position or until it closes completely.
6. A drain trough is positioned under the sunroof glass panel. Water is collected by this trough and is drained off by drain hoses connected at each corner.
7. The glass panel seal fits around the glass panel and is used to seal the opening between the glass panel and the roof panel.
8. The sunroof electrical harness is routed to join the body harness at the right rear pillar.

The power sunroof system consists of the following components

1. Motor/actuator
2. Sunroof control module
3. Sunroof Opening Position Switch (SOPS)
4. Sunroof switch
5. Sunroof glass (tilt/slide type, with glass sliding between roof and headliner)
6. Sunshade
7. Rail and track assembly upon which the sunroof glass rides
8. Power supply for the sunroof control module: PWR WINDOWS PWR SUN ROOF 30 A circuit breaker
9. Ground from G402

Power Sunroof Operation

The power sunroof will operate with the ignition switch turned to Accessory or RUN. Once the ignition switch is turned to OFF the sunroof will continue to operate until any door is open or when the Retained Accessory Power (RAP) has timed out. For a description and operation of the RAP operation, refer to RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION in Retained Accessory Power.

Use the rocker type sunroof switch, located in the front center of the headliner, to command the sunroof to

1. Vent
2. Express open
3. Close

Pressing the sunroof switch (rearward portion), the sunroof glass will slide from

1. Vent position to the closed position.
2. Closed position to the open position.

Pressing the sunroof switch (forward portion), the sunroof glass will slide from

1. Open position to the closed position.
2. Closed position to the vent position.

To Vent Open

To open the power sunroof to the vent position from the closed position, turn the ignition to ON, with engine OFF. Press and hold the sunroof switch (forward portion). This will apply the sunroof switch low reference to the sunroof switch close signal circuit (5 volt reference) input to drop to 0 volts. As long as the sunroof control module sees a constant input request from the sunroof switch close signal circuit (0 volts), the control module will continue to raise the rear of the glass upward to the full vent position. The sunroof glass will stop (soft stop) at the full vent position based on the inputs from the limit switches. To stop the sunroof glass in a position other than the full vent position, release the sunroof switch when the sunroof glass reaches the desired vent position. The sunshade will have to manually slide open.

To Close from Vent Position

To close the power sunroof from the vent position, turn the ignition ON, with the engine OFF. Press and hold the sunroof switch (rearward portion). This will apply the sunroof switch low reference to the sunroof switch open signal circuit (5 volt reference) input to drop to 0 volts. As long as the sunroof control module sees a constant input request from the sunroof switch open signal circuit (0 volts), the module will continue to lower the rear of the glass (downward) to the closed position. The sunroof glass will stop (soft stop) at the closed position based on the inputs from the limit switches. The sunshade will have to be manually slid closed.

Express Open

The express open will work only with the glass in between the closed and partially open positions. To express open the power sunroof, turn the ignition ON, with engine OFF. Press the sunroof switch (rearward portion) once (less than 1.5 seconds). This will apply the sunroof switch low reference to the sunroof switch signal open signal circuit (5 volt reference) input to drop to 0 volts momentarily. The momentary 0 volts input to the sunroof control module indicates an express open request. The sunroof glass will lower slightly, then begin to automatically slide (express open) between the roof and headliner, allowing the wind deflector to raise upward. The sunroof glass will stop (soft stop) at the full open position based on the inputs from the limit switches. As the sunroof glass expresses open so will the sunshade. To stop the sunroof glass in a desired position other than to the express open position

1. As the sunroof is expressing open, press the sunroof switch again (in either direction) to stop the movement.
2. Instead of momentarily pressing the sunroof switch to express open, maintain pressing (more than 1.5 seconds) the sunroof switch (rearward portion). When the sunroof glass reaches the desired position, then release the switch.

To Close from Open Position

To close the power sunroof from the open position is the same as to opening the sunroof glass to the vent position. Turn the ignition ON, with the engine OFF. Press and hold the sunroof switch (forward portion). This will apply the sunroof switch low reference to the sunroof switch close signal circuit (5 volt reference) input to drop to 0 volts. As long as the sunroof control module sees a constant input request from the sunroof switch close signal circuit (0 volts), the module will continue to slide the sunroof glass to the closed position. The sunroof glass will stop (soft stop) at the closed position based on the inputs from the limit switches. The sunshade will have to be manually slide closed.

Sunroof Motor

The sunroof has a bi-directional motor. When the motor is not operating both circuits are grounded. When the motor drives the sunroof glass in the direction from the vent to closed or closed to open position, the following occurs

1. Voltage is supplied to the sunroof motor/actuator feed open circuit.
2. Ground is maintained to the sunroof motor/actuator feed close circuit.

When the motor drives the sunroof in the direction from the open to closed or closed to vent position, the following occurs

1. Voltage is supplied to the sunroof motor/actuator feed close circuit.
2. Ground is maintained to the sunroof motor/actuator feed open circuit.

The sunroof module is equipped with a timer circuit which stops the operation of the sunroof motor after 8 seconds.

Limit Switches

The limit switches are part of the Sunroof Opening Position Switch (SOPS) that tracks the position of the glass through the limit switches and understands the limits (soft stops) of travel to the

1. Full vent position
2. Full open position

The sunroof control module monitors the limit switches SOPS. As a limit switch closes, the sunroof limit switch circuit 5 volt reference will be shorted to the sunroof limit switch low reference circuit, pulling the reference voltage to 0 volts. The sunroof control module understands the position of the sunroof glass based on the multiple input combinations through the limit switch inputs, which brings the sunroof glass to a soft stop when it reaches the full vent or full open positions and when it has reached the closed position.

See also:
• RETAINED ACCESSORY POWER (RAP) ON AFTER TIMEOUT
• DIAGNOSTIC SYSTEM CHECK - POWER SUNROOF
• SUNROOF DESCRIPTION AND OPERATION
• SYMPTOMS - ROOF
• DRAIN HOSE ROUTING
• SUNROOF WINDOW HEIGHT AND OPENING FIT ADJUSTMENT