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

519 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 symptoms, diagnostic steps, 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 avoid shock or short circuits.
•Allow the vehicle to cool before handling any components to prevent burns.

Symptoms

•Headlight switch does not activate headlights
•Dashboard warning light indicating headlight failure
•High beams not functioning
•Low beams not illuminating
•No audible click when switching headlights on/off

Diagnostic Steps

1
Inspect headlight switch functionality for proper operation.
2
Use an OBD-II scanner to check for any fault codes related to the lighting system.
3
Visually inspect the headlight bulbs for any signs of damage or burn out.
4
Check the fuse related to the headlight circuit for continuity.
5
Test headlight wiring harness for any signs of damage or corrosion.
6
Verify the battery voltage and connections 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

•Socket set
•Multimeter
•OBD-II scanner
•Fuse puller

Parts Required

•Replacement headlight bulbs
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Inspect headlight switch functionality for proper operation.
2
Use an OBD-II scanner to check for any fault codes related to the lighting system.
3
Visually inspect the headlight bulbs for any signs of damage or burn out.
4
Check the fuse related to the headlight circuit for continuity.
5
Test headlight wiring harness for any signs of damage or corrosion.
6
Verify the battery voltage and connections to ensure proper power supply.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to prevent electrical shock.
Tools Required: Socket set, multimeter, OBD-II scanner, fuse puller.

2. Inspect and Replace Headlight Bulbs

Remove the headlight assembly to access the bulbs:
1. Unscrew the bolts securing the headlight assembly.
2. Gently pull the assembly forward to disconnect the wiring harness.
Remove the old bulbs:
1. Twist and pull the bulb socket to disconnect from the assembly.
2. Replace with new bulbs, ensuring they are the correct type (check owner's manual).
Reinstall the headlight assembly:
1. Connect the wiring harness.
2. Secure the assembly with screws.

3. Check and Replace Fuses

Locate the fuse box (typically under the dashboard or in the trunk).
Identify the fuse for the headlights using the diagram on the fuse box cover.
Use a fuse puller to remove the headlight fuse:
1. Inspect the fuse for continuity. If it is blown, replace it with a fuse of the same amperage.
Reinstall the fuse and ensure it is seated correctly.

4. Test Wiring and Connections

Inspect the wiring harness for any signs of wear or damage:
1. Check for frayed wires or corrosion on connectors.
2. Use a multimeter to test for continuity in the wiring.
Repair or replace any damaged wiring as necessary.