how to fix the trunk not opening in BMW 3 Series E90/E91 (2005-2012)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock or short-circuiting.

Tools Required:

• Screwdriver set
• Socket set
• Trim removal tool
• Multimeter
• OBD-II scanner (if needed)

2. Inspect and Replace the Key Fob Battery

• Open the key fob using a small screwdriver.
• Replace the battery with a new one (commonly CR2032).
• Reassemble the key fob and test the trunk release button.

3. Check and Replace Fuses

• Locate the fuse box (usually under the dashboard on the driver's side).
• Identify the fuse for the trunk release (refer to the fuse diagram).
• Remove the fuse and inspect it; replace if blown.
• Reconnect the battery and test the trunk release.

4. Inspect the Trunk Release Button

• Remove the panel surrounding the trunk release button.
• Disconnect the wiring harness from the button.
• Use a multimeter to test for continuity when the button is pressed.
• Replace the button if there is no continuity.

5. Inspect the Trunk Latch Mechanism

• Open the trunk manually if necessary.
• Remove the trim panel covering the trunk latch.
• Inspect the latch for obstructions, rust, or damage.
• Lubricate the latch with appropriate lubricant (e.g., WD-40 or silicone spray).
• If damaged, replace the trunk latch assembly.

6. Reassemble and Test

• Reinstall all components and trim panels.
• Reconnect the battery.
• Test the trunk release button and key fob to ensure functionality.