how to fix Tesla Model 3 Original (2017-2023) headlights that won't turn on

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

517 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 headlights 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 shock.

Symptoms

•Headlight switch is on, but headlights remain off
•Dashboard warning for headlight malfunction illuminated
•Fog lights and turn signals operate normally
•No response when toggling the headlight switch
•Headlight bulbs do not show signs of damage or burn-out

Diagnostic Steps

1
Check the headlight switch position to ensure it is set to 'On.'
2
Inspect the exterior headlight bulbs for physical damage or burns.
3
Use an OBD-II scanner to check for any relevant error codes related to the lighting system.
4
Verify the operation of the headlight relay in the fuse box.
5
Inspect the wiring harness for any visible signs of damage or disconnection.
6
Test the voltage at the headlight connector with a multimeter to ensure proper power supply.

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
•Socket set
•Screwdriver set
•Electrical tape

Parts Required

•Replacement headlight bulbs (e.g., H11)
•Headlight relay (if faulty)

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Diagnostic Steps

1
Check the headlight switch position to ensure it is set to 'On.'
2
Inspect the exterior headlight bulbs for physical damage or burns.
3
Use an OBD-II scanner to check for any relevant error codes related to the lighting system.
4
Verify the operation of the headlight relay in the fuse box.
5
Inspect the wiring harness for any visible signs of damage or disconnection.
6
Test the voltage at the headlight connector with a multimeter to ensure proper power supply.

Solution

1. Preparation

Gather tools and parts required. Ensure the vehicle is parked on a level surface and turned off.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Headlight Bulbs

Sub-steps:
1. Access the headlight assembly by removing any necessary covers or panels.
2. Remove the headlight bulb by twisting it counterclockwise and pulling it out from the socket.
3. Inspect the bulb for any signs of damage. If damaged, replace with a new bulb of the same type (e.g., H11).
4. Insert the new bulb into the socket and twist it clockwise to secure.
5. Reassemble any covers or panels removed during access.

3. Check and Replace Headlight Relay

Sub-steps:
1. Locate the fuse box under the dashboard or in the front trunk (frunk).
2. Identify the headlight relay using the fuse box diagram.
3. Remove the relay by pulling it straight out.
4. Replace with a new relay that matches the specifications.
5. Reinstall the relay and ensure it is seated properly.

4. Repair Wiring Issues

Sub-steps:
1. Inspect the wiring harness connected to the headlight assembly for any frayed or disconnected wires.
2. Use electrical tape or heat-shrink tubing to repair any damaged wiring.
3. Ensure all connectors are securely fastened.

5. Reconnect Battery and Test

Sub-steps:
1. Reconnect the negative battery terminal.
2. Turn on the vehicle and test the headlights to ensure they are functioning correctly.