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

BMW 5 Series F10/F11 (2010-2017)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

546 words

Problem Statement

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

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock.

Symptoms

•No illumination of rear tail lights
•Check control message indicating rear light failure
•Functioning brake lights but non-functioning tail lights
•Flickering or dimming of tail lights when headlights are turned on
•Inoperative turn signals on the rear

Diagnostic Steps

1
Inspect the tail light bulbs for any signs of burn-out or damage.
2
Use an OBD-II scanner to check for any fault codes related to the lighting system.
3
Check the fuse for the tail lights located in the fuse box.
4
Inspect the wiring harness and connectors for any signs of corrosion or damage.
5
Test the voltage at the tail light socket to ensure power is being supplied.
6
Verify the operation of the light switch and its connections.

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
•OBD-II scanner
•Socket set

Parts Required

•Tail light bulbs (if needed)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the tail light bulbs for any signs of burn-out or damage.
2
Use an OBD-II scanner to check for any fault codes related to the lighting system.
3
Check the fuse for the tail lights located in the fuse box.
4
Inspect the wiring harness and connectors for any signs of corrosion or damage.
5
Test the voltage at the tail light socket to ensure power is being supplied.
6
Verify the operation of the light switch and its connections.

Solution

1. Preparation

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

Tools Required:

Screwdriver set
Multimeter
OBD-II scanner
Socket set

2. Inspect and Replace Bulbs

Remove the tail light assembly by unscrewing the retaining screws.
Carefully pull the tail light assembly out of the housing.
Remove the bulbs from their sockets and inspect for burn-out.
Replace any faulty bulbs with new ones (ensure proper wattage and type).
Reinstall the tail light assembly and secure it with screws.

3. Check and Replace Fuses

Locate the fuse box, usually found under the dashboard or in the engine compartment.
Identify the fuse for the tail lights using the fuse diagram.
Remove the fuse and inspect it; if broken, replace it with a new one of the same amperage.
Reinstall the fuse.

4. Inspect Wiring and Connectors

Visually inspect the wiring harness leading to the tail lights for any damage.
Disconnect the connectors and check for corrosion or loose connections.
Clean any corrosion with electrical contact cleaner and reconnect.

5. Test Voltage at Tail Light Socket

Reconnect the battery.
Set the multimeter to measure DC voltage.
Test the voltage at the tail light socket; it should read approximately 12 volts with the headlights turned on.
If no voltage is present, further investigation into the wiring harness or switch may be necessary.