what causes my BMW 3 Series F30/F31 (2012-2019) rear lights to stop working

BMW 3 Series F30/F31 (2012-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

550 words

Problem Statement

The rear lights on a BMW 3 Series F30/F31 (2012-2019) have stopped functioning, indicating a possible electrical or component failure.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shock or short circuits.

Symptoms

•Rear lights do not illuminate when headlights are turned on
•Brake lights fail to activate when the brake pedal is pressed
•No turn signal indication from rear lights
•Warning light on dashboard for rear light failure
•Possible blown fuses related to rear lighting circuit

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for any blown fuses associated with the rear lights.
3
Use an OBD-II scanner to check for any error codes related to lighting systems.
4
Examine the wiring and connectors for corrosion or damage leading to the rear lights.
5
Test the light switch and relay function for proper operation.
6
Measure voltage at the rear light connectors to confirm power supply.

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

•Screwdrivers
•Multimeter
•Fuse puller

Parts Required

•Replacement bulbs
•Fuses (if needed)

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Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for any blown fuses associated with the rear lights.
3
Use an OBD-II scanner to check for any error codes related to lighting systems.
4
Examine the wiring and connectors for corrosion or damage leading to the rear lights.
5
Test the light switch and relay function for proper operation.
6
Measure voltage at the rear light connectors to confirm power supply.

Solution

1. Preparation

Gather tools and materials:
- Screwdrivers
- Multimeter
- Replacement bulbs (if needed)
- Fuses (if needed)
Ensure the vehicle is parked on a flat surface and the ignition is off.

2. Inspect and Replace Bulbs

Sub-steps:
1. Open the trunk and remove the rear light assembly cover.
2. Remove the light assembly by unscrewing any fasteners.
3. Pull out the bulb socket and check the bulb; replace if it is burnt out.
4. Reassemble the light assembly and test functionality.

3. Check and Replace Fuses

Sub-steps:
1. Locate the fuse box (typically under the dashboard or in the engine compartment).
2. Identify the fuse related to the rear lights (refer to the owner's manual for specifics).
3. Pull the fuse using a fuse puller and inspect it; if blown, replace with a fuse of the same amperage.
4. Close the fuse box and test the rear lights again.

4. Inspect Wiring and Connectors

Sub-steps:
1. Visually examine the wiring harness leading to the rear lights for any visible damage.
2. Disconnect connectors and inspect for corrosion or loose connections.
3. Repair or replace any damaged wiring or connectors as necessary.
4. Reconnect and secure all components.

5. Test Light Switch and Relay

Sub-steps:
1. Access the light switch to ensure it functions correctly.
2. Use a multimeter to check continuity in the switch.
3. If faulty, replace the light switch.
4. Test the relay associated with the rear lights; replace if malfunctioning.