how to fix brake light issues in 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

508 words

Problem Statement

The brake lights on a BMW 5 Series F10/F11 (2010-2017) are not functioning properly, which can lead to safety issues and potential legal violations.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits.
•Ensure all components are cool to the touch before handling.

Symptoms

•Brake lights do not illuminate when the brake pedal is pressed
•Warning message on the dashboard indicating a brake light issue
•One or more brake lights are dim or flickering
•Inoperable third brake light (if applicable)
•Check control message for bulb failure

Diagnostic Steps

1
Inspect the brake light bulbs for any visible signs of damage or burnout.
2
Use an OBD-II scanner to check for any fault codes related to the brake light system.
3
Check the brake light switch located near the brake pedal for proper operation.
4
Inspect the fuse related to the brake lights for any signs of damage or failure.
5
Verify the wiring connections and harness for any signs of corrosion or disconnection.
6
Test the voltage at the brake light circuit to ensure proper electrical flow.

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

•OBD-II scanner
•Screwdriver set
•Socket set
•Electrical contact cleaner
•Multimeter
•Replacement brake light bulbs
•Replacement brake light switch (if needed)
•Replacement fuse (if needed)

Parts Required

•Brake light bulbs
•Brake light switch (if faulty)
•Fuse (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the brake light bulbs for any visible signs of damage or burnout.
2
Use an OBD-II scanner to check for any fault codes related to the brake light system.
3
Check the brake light switch located near the brake pedal for proper operation.
4
Inspect the fuse related to the brake lights for any signs of damage or failure.
5
Verify the wiring connections and harness for any signs of corrosion or disconnection.
6
Test the voltage at the brake light circuit to ensure proper electrical flow.

Solution

1. Preparation

Gather required tools and parts.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Brake Light Bulbs

Sub-steps:
1. Open the trunk and locate the brake light assembly.
2. Remove the screws or clips securing the brake light assembly.
3. Carefully pull the assembly out and disconnect the wiring harness.
4. Remove the old bulb by twisting it counterclockwise and replace it with a new bulb.
5. Reconnect the wiring harness and reassemble the brake light assembly.

3. Inspect and Replace Brake Light Switch

Sub-steps:
1. Locate the brake light switch near the brake pedal.
2. Disconnect the electrical connector from the switch.
3. Remove the switch from its mounting bracket (may require a socket set).
4. Install the new brake light switch and reconnect the electrical connector.
5. Test the switch by pressing the brake pedal to ensure it activates properly.

4. Check and Replace Fuse

Sub-steps:
1. Open the fuse box located in the glove compartment or engine bay.
2. Identify the fuse for the brake lights (refer to the fuse diagram).
3. Remove the fuse and inspect it for continuity; replace if blown.
4. Reinsert the new fuse and ensure it is seated properly.

5. Verify Wiring and Connections

Sub-steps:
1. Inspect wiring harnesses and connections leading to the brake lights for corrosion.
2. Clean any corroded connections using electrical contact cleaner.
3. Repair any damaged wires by splicing in new wire or using heat-shrink connectors.

Tools Required:

OBD-II scanner
Screwdriver set
Socket set
Electrical contact cleaner
Multimeter
Replacement brake light bulbs
Replacement brake light switch (if needed)
Replacement fuse (if needed)

Parts Required:

Brake light bulbs
Brake light switch (if faulty)
Fuse (if blown)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect the battery before working on electrical systems to prevent short circuits.
Ensure all components are cool to the touch before handling.