how to fix fog lights not working on Volkswagen Golf MK7 (2015-2019)

Volkswagen Golf MK8.5 (2024-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

564 words

Problem Statement

Learn how to diagnose and fix fog lights not working on Volkswagen Golf MK7 (2015-2019). Step-by-step guide with symptoms, tools, 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 shock or short circuits.

Symptoms

•Fog lights do not illuminate when switched on
•Dashboard warning light for fog lights may be illuminated
•No audible click from the fog light relay when activated
•Fog light bulbs appear dark or discolored (if visually inspected)
•Other exterior lights (headlights, turn signals) functioning normally

Diagnostic Steps

1
Inspect the fog light bulbs for any signs of damage or burnout.
2
Check the fog light fuse in the fuse box for continuity.
3
Use an OBD-II scanner to check for any related error codes.
4
Inspect the fog light switch for proper operation and continuity.
5
Test the fog light relay for functionality using a multimeter.
6
Examine the wiring and connectors for any signs of corrosion or damage.

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
•Flathead screwdriver
•Fuse puller or needle-nose pliers
•Multimeter

Parts Required

•Fog light bulbs (H11)
•Fog light fuse (15A)
•Fog light relay (if necessary)

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Symptoms

•Fog lights do not illuminate when switched on

•Dashboard warning light for fog lights may be illuminated

•No audible click from the fog light relay when activated

•Fog light bulbs appear dark or discolored (if visually inspected)

•Other exterior lights (headlights, turn signals) functioning normally

Diagnostic Steps

1
Inspect the fog light bulbs for any signs of damage or burnout.
2
Check the fog light fuse in the fuse box for continuity.
3
Use an OBD-II scanner to check for any related error codes.
4
Inspect the fog light switch for proper operation and continuity.
5
Test the fog light relay for functionality using a multimeter.
6
Examine the wiring and connectors for any signs of corrosion or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to prevent electrical shock.

2. Inspect and Replace Fog Light Bulbs

Tools Required: Socket set, flathead screwdriver
Remove the fog light assembly by accessing the mounting screws.
- Use a socket set to remove screws securing the fog light assembly.
- Gently pull the assembly out and disconnect the wiring harness.
Inspect the bulbs:
- If bulbs are burnt out, replace with new bulbs of the same type (usually H11 for MK7).
Reassemble by reversing the removal steps.

3. Check and Replace Fog Light Fuse

Tools Required: Fuse puller or needle-nose pliers
Locate the fuse box (usually under the dashboard or in the engine bay).
Identify the fog light fuse (refer to the fuse diagram on the cover).
Remove the fuse and check for continuity:
- If blown, replace with a new fuse of the same amperage (typically 15A).
Reinstall the fuse and close the fuse box.

4. Test Fog Light Relay

Tools Required: Multimeter
Locate the fog light relay in the fuse box.
Remove the relay and test it:
- Use a multimeter to check for continuity across the relay terminals when activated.
If the relay is faulty, replace it with a new one.

5. Inspect Wiring and Connections

Visually inspect the wiring and connectors leading to the fog lights.
Look for signs of wear, corrosion, or disconnection.
Repair or replace any damaged wires or connectors as necessary.