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

BMW 3 Series E90/E91 (2005-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

572 words

Problem Statement

The rear lights on a BMW 3 Series E90/E91 (2005-2012) are not functioning, which could be due to various electrical or component failures.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock.
•Allow the vehicle to cool if any components were heated during operation.

Symptoms

•Rear lights do not illuminate when headlights are turned on
•Brake lights are non-functional
•Turn signal indicators at the rear are not working
•Check control warning message on the dashboard
•Fuses related to the rear lights are blown
•Possible intermittent operation of rear lights

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burn-out or damage.
2
Check the relevant fuses for the rear lights in the fuse box.
3
Use an OBD-II scanner to check for any related error codes.
4
Test the wiring harness for continuity and signs of wear or damage.
5
Inspect the rear light assembly for corrosion or poor connections.
6
Verify the operation of the light switch and dimmer control.

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

•Multimeter
•Fuse puller tool
•Socket set
•Screwdrivers (flathead and Phillips)

Parts Required

•Replacement light bulbs (if needed)
•Replacement fuses (if needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burn-out or damage.
2
Check the relevant fuses for the rear lights in the fuse box.
3
Use an OBD-II scanner to check for any related error codes.
4
Test the wiring harness for continuity and signs of wear or damage.
5
Inspect the rear light assembly for corrosion or poor connections.
6
Verify the operation of the light switch and dimmer control.

Solution

1. Preparation

Gather tools and materials required.
Disconnect the vehicle battery to prevent electrical shock.
Ensure the vehicle is parked on a level surface with the ignition off.

2. Inspect and Replace Bulbs

Sub-steps:
1. Open the trunk and remove the access panel to the rear light assembly.
2. Remove the light bulb socket from the assembly by twisting it counterclockwise.
3. Inspect the bulb; if the filament is broken, replace it with a new bulb of the same type.
4. Reinsert the bulb socket into the assembly and secure it by twisting clockwise.

3. Check and Replace Fuses

Sub-steps:
1. Locate the fuse box (usually found under the dashboard or in the engine compartment).
2. Use the fuse puller tool to remove the fuse related to the rear lights.
3. Inspect the fuse for continuity; if blown, replace it with a fuse of the same rating (typically 15A).
4. Reinstall the fuse into the fuse box and ensure it is seated properly.

4. Test Wiring and Connections

Sub-steps:
1. Use a multimeter to check for power at the rear light connector.
2. If no power is present, trace the wiring back to the fuse box and inspect for breaks or corrosion.
3. Repair or replace any damaged wiring.
4. Ensure all connectors are clean and tightly secured.

5. Reassemble and Finalize

Sub-steps:
1. Reattach any access panels removed during the process.
2. Reconnect the vehicle battery.
3. Turn on the ignition and check the operation of the rear lights.