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

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

576 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 12V battery before working on electrical systems to prevent electrical shock.
•Allow the vehicle components to cool before touching to avoid burns.

Symptoms

•Headlight switch does not activate lights
•Dashboard indicator for headlights remains off
•No response from high beams when activated
•Ambient light sensor may not function (if equipped)
•Exterior lights may flash intermittently or not at all

Diagnostic Steps

1
Check the headlight switch position to ensure it is set to the 'On' or 'Auto' position.
2
Inspect the vehicle's settings through the touchscreen to confirm headlight settings.
3
Scan for error codes using a Tesla diagnostic tool to identify any faults related to the lighting system.
4
Verify the battery voltage to ensure that the vehicle's electrical system is functioning properly.
5
Inspect the headlight bulbs for any signs of damage or burn-out.
6
Check the headlight fuses for continuity and proper function.

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
•Fuse puller or needle nose pliers
•Multimeter
•Gloves
•Safety glasses

Parts Required

•Replacement headlight bulbs
•Replacement fuses (if necessary)

Related Faults

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Diagnostic Steps

1
Check the headlight switch position to ensure it is set to the 'On' or 'Auto' position.
2
Inspect the vehicle's settings through the touchscreen to confirm headlight settings.
3
Scan for error codes using a Tesla diagnostic tool to identify any faults related to the lighting system.
4
Verify the battery voltage to ensure that the vehicle's electrical system is functioning properly.
5
Inspect the headlight bulbs for any signs of damage or burn-out.
6
Check the headlight fuses for continuity and proper function.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and is turned off.
Disconnect the 12V battery to prevent electrical shock.

2. Inspect and Replace Headlight Bulbs

Tools Required: Socket set, gloves, safety glasses.
Steps:
1. Open the front trunk (frunk) and locate the headlight assembly.
2. Remove the headlight assembly cover by unscrewing the retaining screws.
3. Gently disconnect the wiring harness from the headlight bulb.
4. Remove the old bulb by turning it counterclockwise and pulling it out.
5. Install the new bulb by aligning it properly and turning it clockwise until secure.
6. Reconnect the wiring harness and replace the headlight assembly cover.

3. Inspect and Replace Fuses

Tools Required: Fuse puller or needle nose pliers.
Steps:
1. Locate the fuse box, typically found under the dashboard or in the frunk.
2. Identify the fuse related to the headlights (refer to the owner’s manual for the specific fuse location).
3. Remove the fuse and inspect it for continuity using a multimeter.
4. If the fuse is blown, replace it with a new fuse of the same amperage rating.
5. Reinstall the fuse and test the headlights.

4. Verify Headlight Settings

Steps:
1. Reconnect the 12V battery.
2. Turn on the vehicle and access the vehicle settings through the touchscreen.
3. Navigate to the "Lights" section and ensure that the headlight settings are correctly configured.
4. Test the headlights again to confirm operation.