how to fix my BMW 5 Series F10/F11 (2010-2017) if the rear lights are not working

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Bulbs

• Tools Required: Flathead screwdriver, replacement bulbs.
• Remove the rear light assembly by unscrewing the retaining screws.
• Gently pull the assembly away from the vehicle and disconnect the wiring harness.
• Inspect each bulb; replace any that are burnt out with new ones, ensuring they are the correct type.
• Reconnect the wiring harness and secure the rear light assembly back in place.

3. Check and Replace Fuses

• Tools Required: Fuse puller or needle-nose pliers.
• Locate the fuse box (typically under the dashboard or in the engine compartment).
• Refer to the fuse diagram to identify the fuse for the rear lights.
• Pull the fuse and inspect it; replace it if it appears blown (the wire inside the fuse will be broken).
• Reinstall the fuse and ensure it is seated properly.

4. Inspect Wiring and Connectors

• Tools Required: Multimeter, electrical cleaner.
• Examine the wiring harness that connects to the rear lights for any signs of wear or damage.
• Use a multimeter to check for continuity in the wires leading to the rear light assembly.
• Clean any corroded connectors with electrical cleaner and ensure they are securely attached.

5. Test Light Switch and Wiring

• Tools Required: Multimeter.
• Remove the light switch from the dashboard.
• Use a multimeter to test for power output when the switch is activated.
• If the switch is faulty, replace it with a new unit.