Volkswagen Golf MK7.5 (2020-Present) rear lights not working what could be the issue

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

542 words

Problem Statement

Learn how to diagnose and fix rear lights not working on Volkswagen Golf MK7.5. Step-by-step guide with symptoms, diagnostic steps, 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 the electrical system to prevent shocks or shorts.

Symptoms

•No illumination of rear lights when headlights are activated
•No response from brake lights when pedal is pressed
•No turn signal activation from rear lights
•Possible illumination of dashboard warning lights (e.g., bulb failure indicator)
•Potential intermittent operation of rear lights

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse for the rear lights in the fuse box; replace if blown.
3
Use an OBD-II scanner to check for any error codes related to lighting systems.
4
Test the wiring harness and connectors for corrosion or loose connections.
5
Verify the function of the light switch and its connection to the rear lights.
6
Measure voltage at the rear light assembly with a multimeter when the lights are activated.

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

•Socket set
•Multimeter
•OBD-II scanner
•Fuse puller

Parts Required

•Replacement bulbs (if necessary)
•Fuse (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse for the rear lights in the fuse box; replace if blown.
3
Use an OBD-II scanner to check for any error codes related to lighting systems.
4
Test the wiring harness and connectors for corrosion or loose connections.
5
Verify the function of the light switch and its connection to the rear lights.
6
Measure voltage at the rear light assembly with a multimeter when the lights are activated.

Solution

1. Preparation

Gather tools: socket set, multimeter, OBD-II scanner, and replacement bulbs if necessary.
Ensure the vehicle is parked on a flat surface, and the ignition is off.

2. Inspect and Replace Bulbs

Remove the rear light assembly by unscrewing the retaining screws.
Disconnect the wiring harness from the rear light assembly.
Inspect each bulb for filament damage; replace any burnt-out bulbs with OEM or compatible replacements.
Reconnect the wiring harness and reassemble the rear light assembly.

3. Check and Replace Fuses

Locate the vehicle's fuse box, typically found under the dashboard or in the engine compartment.
Identify the fuse designated for the rear lights using the diagram on the fuse box cover.
Remove the fuse using a fuse puller or pliers; inspect for continuity or damage.
Replace the fuse with one of the same amperage rating if blown.

4. Repair Wiring Connections

Inspect the wiring harness for any signs of fraying, corrosion, or disconnection.
Use a multimeter to check for continuity between the light switch and the rear light assembly.
Repair any damaged wires with appropriate connectors or electrical tape.

5. Test Light Switch Functionality

Remove the light switch panel from the dashboard.
Test the switch for proper operation using a multimeter to ensure it sends power to the rear light circuit.
Replace the light switch if it fails the test.