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

BMW 5 Series F10/F11 (2010-2017)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

577 words

Problem Statement

The rear lights on a BMW 5 Series F10/F11 (2010-2017) are not functioning, which may indicate an electrical fault or a component failure.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts or shocks.

Symptoms

•All rear lights (brake lights, tail lights) are not illuminating
•Possible warning light on the dashboard indicating a bulb failure
•No response when activating the brake pedal or turning on the headlights
•Inoperative rear turn signals
•Flickering or intermittent operation of rear lights (if applicable)

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burn out or damage.
2
Check the fuse related to the rear lights using the fuse box diagram.
3
Test the electrical connectors at the rear light assembly for corrosion or loose connections.
4
Use an OBD-II scanner to check for any fault codes related to the lighting system.
5
Verify the functionality of the light switch and wiring harness leading to the rear lights.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Remove the rear light assembly by unscrewing the retaining screws.
•Gently pull the assembly away from the vehicle and disconnect the wiring harness.
•Reconnect the wiring harness and secure the rear light assembly back in place.

Parts Required

•Replacement bulbs
•Fuses (if blown)
•Light switch (if faulty)

Related Faults

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Symptoms

•All rear lights (brake lights, tail lights) are not illuminating

•Possible warning light on the dashboard indicating a bulb failure

•No response when activating the brake pedal or turning on the headlights

•Inoperative rear turn signals

•Flickering or intermittent operation of rear lights (if applicable)

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burn out or damage.
2
Check the fuse related to the rear lights using the fuse box diagram.
3
Test the electrical connectors at the rear light assembly for corrosion or loose connections.
4
Use an OBD-II scanner to check for any fault codes related to the lighting system.
5
Verify the functionality of the light switch and wiring harness leading to the rear lights.

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.