how to fix the 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

4 min read

604 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 components to prevent shock.
•Allow the vehicle's components to cool down before inspection to avoid burns.

Symptoms

•Headlights do not illuminate when switched on
•Dashboard warning light for headlights may be illuminated
•High beam function may also be non-operational
•Automatic headlight feature not engaging
•No sound or click from the headlight relay when activated

Diagnostic Steps

1
Check the headlight switch setting to ensure it is in the 'on' position.
2
Scan the vehicle’s diagnostic system using an OBD-II scanner for any error codes related to the headlights.
3
Inspect the headlight bulbs visually for any signs of damage or burnout.
4
Verify the vehicle's battery voltage and ensure it is within the normal range (12.4 to 12.6 volts).
5
Examine the headlight fuses in the fuse box for any blown fuses.
6
Test the headlight relay using a multimeter to ensure it is functioning correctly.

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
•Pliers

Parts Required

•Headlight bulbs (if burnt out)
•Fuses (if blown)
•Headlight relay (if defective)

Related Faults

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Diagnostic Steps

1
Check the headlight switch setting to ensure it is in the 'on' position.
2
Scan the vehicle’s diagnostic system using an OBD-II scanner for any error codes related to the headlights.
3
Inspect the headlight bulbs visually for any signs of damage or burnout.
4
Verify the vehicle's battery voltage and ensure it is within the normal range (12.4 to 12.6 volts).
5
Examine the headlight fuses in the fuse box for any blown fuses.
6
Test the headlight relay using a multimeter to ensure it is functioning correctly.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, pliers, replacement bulbs, and fuses if necessary.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the negative terminal of the battery to prevent electrical shock.

2. Replace Headlight Bulbs (if necessary)

Open the front trunk (frunk) to access the headlights.
Remove the headlight assembly cover by unscrewing any retaining screws or clips.
Disconnect the electrical connector from the back of the headlight bulb.
Remove the old bulb by turning it counterclockwise and pulling it straight out.
Insert the new bulb by aligning it properly and turning it clockwise until secure.
Reconnect the electrical connector and replace the headlight assembly cover.

3. Check and Replace Fuses (if necessary)

Locate the fuse box, typically found under the dashboard on the driver’s side or in the frunk.
Identify the headlight fuse using the diagram on the fuse box cover.
Remove the fuse using pliers and inspect it for continuity.
If blown, replace it with a fuse of the same amperage rating (usually 15A or 20A).
Reassemble the fuse box cover.

4. Test Headlight Relay (if necessary)

Locate the headlight relay in the fuse box; refer to the owner's manual for its position.
Remove the relay and inspect it for any visible damage.
Using a multimeter, test the relay for continuity according to the manufacturer's specifications.
Replace the relay with a new one if it fails the continuity test.

5. Reconnect Battery

Reconnect the negative battery terminal and ensure it is tight.
Start the vehicle and test the headlights to confirm functionality.