how to fix BMW 3 Series E90/E91 (2005-2012) tail lights not working

BMW 3 Series E90/E91 (2005-2012)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

617 words

Problem Statement

The tail lights on a BMW 3 Series E90/E91 (2005-2012) are not functioning, potentially due to electrical faults, blown bulbs, or issues with the tail light assembly.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock or short circuits.

Symptoms

•Tail lights do not illuminate when headlights are turned on
•Dashboard warning light for tail light malfunction may be illuminated
•Brake lights may still function while tail lights do not
•Possible flickering or dimming of other electrical components
•Water intrusion or moisture in the tail light assembly

Diagnostic Steps

1
Inspect the tail light bulbs to check for any signs of burning out or damage.
2
Use an OBD-II scanner to check for any related fault codes.
3
Verify the integrity of the tail light fuse by checking the fuse box for any blown fuses.
4
Examine the wiring and connectors leading to the tail light assembly for any signs of corrosion or damage.
5
Test the voltage at the tail light socket using a multimeter to ensure it is receiving power when the headlights are on.

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
•Electrical contact cleaner
•Pliers
•Socket set

Parts Required

•Replacement tail light bulbs
•Electrical tape (if wiring repair is needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Tail lights do not illuminate when headlights are turned on

•Dashboard warning light for tail light malfunction may be illuminated

•Brake lights may still function while tail lights do not

•Possible flickering or dimming of other electrical components

•Water intrusion or moisture in the tail light assembly

Diagnostic Steps

1
Inspect the tail light bulbs to check for any signs of burning out or damage.
2
Use an OBD-II scanner to check for any related fault codes.
3
Verify the integrity of the tail light fuse by checking the fuse box for any blown fuses.
4
Examine the wiring and connectors leading to the tail light assembly for any signs of corrosion or damage.
5
Test the voltage at the tail light socket using a multimeter to ensure it is receiving power when the headlights are on.

Solution

1. Preparation

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

2. Remove Tail Light Assembly

Open the trunk and locate the access panel for the tail light assembly.
Remove the screws or clips securing the access panel.
Disconnect the electrical connector from the tail light assembly.
Remove the retaining screws securing the tail light assembly to the vehicle body.
Carefully pull the tail light assembly out from the rear of the vehicle.

3. Inspect and Replace Bulbs

Remove the bulb socket from the tail light assembly.
Check the bulbs for any signs of burning out; replace any faulty bulbs with new ones.
Ensure that the replacement bulbs are of the correct type (usually 21W for tail lights).

4. Check and Repair Wiring

Inspect the wiring harness for any frayed or damaged wires.
If damage is found, repair the wiring using electrical tape or replace the damaged section with a new wire of the same gauge.
Clean any corroded connectors with electrical contact cleaner and ensure a secure connection.

5. Reassemble Tail Light Assembly

Reconnect the electrical connector to the tail light assembly.
Position the tail light assembly back into the housing and secure it with retaining screws.
Replace the access panel and secure it with screws or clips.

6. Reconnect Battery and Test

Reconnect the negative battery terminal.
Turn on the vehicle and check if the tail lights are functioning correctly.