how to fix a stuck sunroof on my BMW 3 Series E90/E91?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.

Tools Required:

• Screwdriver set
• Torx bit set
• Multimeter
• Pliers
• Flashlight

2. Remove Sunroof Liner

• Using the screwdriver, carefully remove the screws securing the sunroof liner.
• Gently pull down the liner to access the sunroof mechanism without damaging it.
• Disconnect any electrical connectors if applicable.

3. Inspect and Clean Mechanism

• Examine the sunroof tracks for dirt, debris, or any obstructions.
• Clean the tracks using a soft cloth and a suitable cleaner.
• Apply a small amount of silicone lubricant to the tracks to ensure smooth operation.

4. Test Sunroof Motor

• Locate the sunroof motor and disconnect its electrical connector.
• Using a multimeter, check for voltage at the connector when the switch is activated.
• If there is voltage, replace the motor; if not, trace the wiring for shorts or breaks.

5. Replace Sunroof Motor (if necessary)

• Remove the mounting bolts securing the sunroof motor using the Torx bit.
• Replace with a new motor, ensuring proper alignment.
• Reconnect the electrical connector and secure the motor in place.

6. Reassemble Sunroof Liner

• Reconnect any electrical connectors for the sunroof liner.
• Align the liner back in place and secure with screws.
• Reconnect the vehicle battery.