my BMW 3 Series E90/E91 (2005-2012) window won't go up what could be wrong

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shock.
• Safety warning: Allow the vehicle to cool and ensure the ignition is off.

2. Remove Door Panel

• Sub-steps:
  • Use a trim removal tool to carefully pry off any clips holding the door panel.
  • Remove screws securing the door panel (typically located near the door handle and bottom edge).
  • Carefully disconnect any electrical connectors (e.g., power window switch, speakers).
  • Lift the door panel upwards to detach it from the door frame.

3. Inspect and Replace Window Motor/Regulator

• Sub-steps:
  • Once the door panel is removed, locate the window motor and regulator assembly.
  • Check for any physical damage or obstructions in the regulator mechanism.
  • If the motor is faulty, disconnect the wiring harness and remove the motor (usually secured by a couple of bolts).
  • Install the new window motor by reversing the removal process. Ensure it is securely attached and connected.
  • If the regulator is damaged, replace it with a new unit by removing the necessary bolts and installing the new one.

4. Reassemble Door Panel

• Sub-steps:
  • Reconnect any electrical connectors to the door panel.
  • Align the door panel with the door frame and push it into place.
  • Reinstall screws and ensure all clips are secured.
  • Reconnect the battery and test the window operation before finalizing the assembly.