how to fix Tesla Model S Original (2012-2020) fog lights that won't turn on

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

481 words

Problem Statement

Learn how to diagnose and fix fog lights that won't turn on in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the vehicle to cool down before handling any components that may be hot.

Symptoms

•Fog lights do not illuminate when activated
•Related warning messages on the dashboard
•Possible flickering of other exterior lights
•No sound of relay activation when the fog light switch is engaged
•Increased visibility issues in foggy conditions

Diagnostic Steps

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

•OBD-II scanner
•Multimeter
•Screwdriver set
•Electrical contact cleaner

Parts Required

•Fog light bulbs (if burnt out)
•Fog light relay (if defective)

Related Faults

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Diagnostic Steps

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

Solution

1. Preparation

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

2. Inspect and Replace Fog Light Bulbs

Sub-steps:
1. Remove the fog light housing from the front bumper by unscrewing the mounting screws.
2. Disconnect the electrical connector from the fog light bulb.
3. Remove the old bulb by twisting it counterclockwise and replace it with a new one.
4. Reconnect the electrical connector and re-install the fog light housing.

3. Test the Fog Light Relay

Sub-steps:
1. Locate the fuse box (typically found under the dashboard or in the engine compartment).
2. Identify the fog light relay using the fuse box diagram.
3. Remove the relay and test it with a multimeter for continuity.
4. If defective, replace the relay with a new one.

4. Check Wiring and Connectors

Sub-steps:
1. Visually inspect the wiring leading to the fog lights for any signs of wear or damage.
2. Clean any corroded connectors with electrical contact cleaner.
3. Secure any loose connections and ensure they are free from moisture.