how to fix Tesla Model 3 Original (2017-2023) fog lights not turning on

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

676 words

Problem Statement

Learn how to diagnose and fix fog lights not turning on in Tesla Model 3 (2017-2023). 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

•Fog lights do not turn on when selected
•Dashboard indicator for fog lights is off
•No unusual noises or flickering from the fog light area
•Other exterior lights (headlights, turn signals) are functioning properly
•Possible associated error messages on the dashboard display

Diagnostic Steps

1
Check the fog light switch in the vehicle to ensure it is set to the 'on' position.
2
Inspect the fog light bulbs for any signs of damage or burnt filaments.
3
Use the Tesla infotainment system to check for any software updates that may affect lighting functions.
4
Verify the fog light fuse using the fuse box diagram and check for continuity with a multimeter.
5
Perform a visual inspection of the wiring harness connected to the fog lights for any signs of damage or corrosion.
6
Run a diagnostic scan using the Tesla service tool to check for any error codes related to the lighting system.

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

•Multimeter
•Socket set
•Small flathead screwdriver
•Fuse puller or needle-nose pliers

Parts Required

•Replacement fog light bulb (if applicable)
•Replacement fuse (if applicable)

Related Faults

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Diagnostic Steps

1
Check the fog light switch in the vehicle to ensure it is set to the 'on' position.
2
Inspect the fog light bulbs for any signs of damage or burnt filaments.
3
Use the Tesla infotainment system to check for any software updates that may affect lighting functions.
4
Verify the fog light fuse using the fuse box diagram and check for continuity with a multimeter.
5
Perform a visual inspection of the wiring harness connected to the fog lights for any signs of damage or corrosion.
6
Run a diagnostic scan using the Tesla service tool to check for any error codes related to the lighting system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the 12V battery for safety before working on electrical components.

2. Inspect and Replace Bulbs

Tools Required: Socket set, small flathead screwdriver
Remove the fog light assembly:
- Access the fog light from underneath the front bumper.
- Use the screwdriver to remove the clips or screws securing the fog light assembly.
Inspect the fog light bulb:
- Remove the bulb from the socket and check for broken filaments or discoloration.
Replace the bulb if necessary:
- Insert a new bulb into the socket, ensuring it is securely fitted.
Reinstall the fog light assembly back into the bumper.

3. Check and Replace Fuse

Tools Required: Fuse puller or needle-nose pliers
Locate the fuse box:
- Refer to the owner’s manual for the exact location of the fog light fuse in the fuse box.
Remove the fog light fuse:
- Use the fuse puller to carefully take out the fog light fuse.
Inspect the fuse:
- Check if the metal strip inside the fuse is intact. If broken, replace with a new fuse of the same rating (typically 15A).
Reinstall the fuse back into the fuse box.

4. Inspect Wiring and Connectors

Tools Required: Multimeter
Examine the wiring harness:
- Check for any damaged, exposed, or corroded wires leading to the fog lights.
Test connectors for continuity:
- Use a multimeter to check for voltage at the fog light connectors when the fog lights are switched on.
- If there is no voltage, trace the wiring back to the switch and inspect for faults.

5. Reconnect Battery and Perform System Check

Reconnect the 12V battery.
Turn on the vehicle and activate the fog lights to verify functionality.
Check for any error messages on the dashboard relating to the lighting system.