how to fix the rear brake lights not working on my Volkswagen Golf MK7.5 (2020-Present)?

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

4 min read

642 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix rear brake lights not working on Volkswagen Golf MK7.5. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.

Symptoms

•Rear brake lights do not illuminate when the brake pedal is pressed
•Check engine light may illuminate (if linked to rear lighting issues)
•Dashboard warning message related to rear lights
•Other tail lights may be functioning normally
•Possible flickering or inconsistent operation of brake lights

Diagnostic Steps

1
Inspect the brake light bulbs for any signs of burnout or damage.
2
Check the brake light fuse in the fuse box to see if it is blown.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Test the brake light switch for proper operation by checking its electrical continuity.
5
Inspect the wiring harness for any signs of damage or corrosion, particularly near the tail light assembly.
6
Verify the grounding of the brake light circuit to ensure a proper connection.

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

•Flathead screwdriver
•Fuse puller or needle-nose pliers
•Multimeter
•Wire stripper/crimper

Parts Required

•Brake light bulbs (specific type for MK7.5)
•Brake light fuse (if blown)
•Brake light switch (if faulty)

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Symptoms

•Rear brake lights do not illuminate when the brake pedal is pressed

•Check engine light may illuminate (if linked to rear lighting issues)

•Dashboard warning message related to rear lights

•Other tail lights may be functioning normally

•Possible flickering or inconsistent operation of brake lights

Diagnostic Steps

1
Inspect the brake light bulbs for any signs of burnout or damage.
2
Check the brake light fuse in the fuse box to see if it is blown.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Test the brake light switch for proper operation by checking its electrical continuity.
5
Inspect the wiring harness for any signs of damage or corrosion, particularly near the tail light assembly.
6
Verify the grounding of the brake light circuit to ensure a proper connection.

Solution

1. Preparation

Gather tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is turned off.
Disconnect the negative battery terminal for safety.

2. Inspect and Replace Brake Light Bulbs

Tools Required: Flathead screwdriver or bulb puller
Remove the tail light assembly by unscrewing the retaining screws and gently pulling the assembly away from the vehicle.
Remove the faulty brake light bulb by twisting it counterclockwise and pulling it straight out.
Replace with a new bulb (ensure it is the correct type: typically 21W for brake lights).
Reinstall the tail light assembly and secure it with the screws.

3. Check and Replace the Brake Light Fuse

Tools Required: Fuse puller or needle-nose pliers
Locate the fuse box (usually under the dashboard or in the engine compartment) and refer to the diagram to identify the brake light fuse.
Pull the fuse out and inspect it for continuity. If the metal strip inside is broken, replace it with a new fuse of the same amperage.
Reinsert the fuse and ensure it is seated properly.

4. Test the Brake Light Switch

Tools Required: Multimeter
Locate the brake light switch, usually mounted near the brake pedal.
Disconnect the switch connector and use a multimeter to check for continuity when the brake pedal is pressed.
If the switch does not show continuity, it should be replaced. Remove the switch by unscrewing it from its mount and install a new switch.

5. Inspect Wiring and Ground Connection

Tools Required: Wire stripper/crimper, multimeter
Visually inspect the wiring harness connected to the tail light assembly for frays or corrosion.
Check the ground connection for the brake lights; clean and tighten any loose connections.
If damaged wiring is found, repair or replace the affected sections using appropriate wiring techniques.