my Tesla Model S Original (2012-2020) headlights not turning on

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

509 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 S (2012-2020). 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 avoid shock or short circuits.

Symptoms

•Headlights completely off, no illumination
•Dashboard warning light for headlights illuminated
•Fog lights functioning, but low/high beams not operational
•No response when switching headlight settings
•Possible malfunction of other electrical components (e.g., turn signals)

Diagnostic Steps

1
Check the headlight switch position to ensure it's set correctly.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Inspect the headlight fuses in the fuse box for any blown fuses.
4
Examine the wiring harness and connectors for damage or corrosion.
5
Test the headlight bulbs to ensure they are functioning properly.
6
Check the battery voltage and connections to ensure adequate 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
•Screwdriver set
•Fuse puller
•Electrical connector cleaner

Parts Required

•Headlight bulbs (if faulty)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Check the headlight switch position to ensure it's set correctly.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Inspect the headlight fuses in the fuse box for any blown fuses.
4
Examine the wiring harness and connectors for damage or corrosion.
5
Test the headlight bulbs to ensure they are functioning properly.
6
Check the battery voltage and connections to ensure adequate power supply.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the vehicle's battery to prevent electrical shock.
Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Replace Fuses

Locate the Fuse Box: Open the trunk and remove the cover to the fuse box.
Check Fuses: Identify the headlight fuses (refer to the vehicle manual for the exact location).
Replace Blown Fuses: If any fuses are blown, use a fuse puller to remove them and replace with fuses of the same amperage.

3. Inspect Wiring and Connectors

Visual Inspection: Look for any visible damage to the wiring harness connected to the headlights.
Clean Connections: If corrosion is present on connectors, clean them with an electrical connector cleaner. Ensure all connections are tight.

4. Test and Replace Headlight Bulbs

Access Headlight Assembly: Remove the headlight assembly by unscrewing the retaining screws.
Remove Bulb: Twist the bulb socket counterclockwise and pull it out.
Test Bulbs: Use a multimeter to test the bulbs for continuity. Replace any non-functional bulbs with new ones, ensuring they match OEM specifications.

5. Reconnect Battery and Test

Reconnect Battery: Once all checks and replacements are complete, reconnect the battery terminals securely.
Test Headlights: Turn on the headlights to verify if they are operational.