why do my BMW 5 Series F10/F11 (2010-2017) tail lights not work?

BMW 5 Series F10/F11 (2010-2017)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

551 words

Problem Statement

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

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before starting any electrical work to avoid shocks or short circuits.

Symptoms

•Tail lights do not illuminate when headlights are turned on
•Check control warning message on the dashboard
•Brake lights may or may not function
•Turn signal lights may work inconsistently
•Possible blown fuses related to tail light circuits
•Dim or flickering lights when activated

Diagnostic Steps

1
Inspect the tail light bulbs for any signs of burning out or damage.
2
Check the fuse box for blown fuses related to tail lights; refer to the owner's manual for the correct fuse location.
3
Use an OBD-II scanner to check for any stored error codes that may indicate electrical issues.
4
Visually inspect the tail light assemblies for corrosion or damaged wiring connectors.
5
Test the voltage at the tail light socket using a multimeter to ensure power is reaching the assembly.
6
Verify the operation of the light switch and ensure it is functioning properly.

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

•Screwdriver set
•Multimeter
•Fuse puller
•Electrical cleaner

Parts Required

•Tail light bulbs (if found defective)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the tail light bulbs for any signs of burning out or damage.
2
Check the fuse box for blown fuses related to tail lights; refer to the owner's manual for the correct fuse location.
3
Use an OBD-II scanner to check for any stored error codes that may indicate electrical issues.
4
Visually inspect the tail light assemblies for corrosion or damaged wiring connectors.
5
Test the voltage at the tail light socket using a multimeter to ensure power is reaching the assembly.
6
Verify the operation of the light switch and ensure it is functioning properly.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Bulbs

Remove the tail light assembly by unscrewing the retaining screws.
Pull the assembly out carefully and disconnect the wiring harness.
Remove the old bulbs by twisting them counterclockwise and replace them with new bulbs.
Reconnect the wiring harness and reinsert the tail light assembly, securing it with screws.

3. Check and Replace Fuses

Locate the fuse box; remove the cover.
Identify the fuse for the tail lights as per the owner's manual.
Pull the fuse using a fuse puller; check if the metal strip is intact.
If blown, replace it with a new fuse of the same amperage rating.
Reassemble the fuse box cover.

4. Repair Wiring Issues

If no issues were found with bulbs or fuses, inspect the wiring harness for any signs of fraying or corrosion.
Use electrical cleaner to clean any corroded connectors.
Repair any damaged wires with appropriate automotive wire and solder or butt connectors.
Ensure all connections are secure and insulated.

5. Reassemble and Test

Reconnect the battery terminal.
Test the tail lights by turning on the headlights to ensure they work properly.
Check the operation of the brake and turn signal lights as well.