how to troubleshoot 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

568 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 troubleshoot and fix headlights not turning on in Tesla Model S (2012-2020). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle from the charging station before performing any electrical work.
•Allow the vehicle’s electrical system to discharge before working on components to prevent electric shock.

Symptoms

•Headlights do not illuminate when activated
•Dashboard light indicating headlight status may be illuminated
•High beams may not engage
•Ambient light sensor may not adjust cabin lighting
•No audible click sound when headlight switch is activated

Diagnostic Steps

1
Inspect the headlight switch for proper operation and ensure it is in the correct position.
2
Check the vehicle's battery voltage to ensure it is within the operational range.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Verify headlight bulbs are not burned out by inspecting visually or testing with a multimeter.
5
Inspect wiring and connectors for any signs of corrosion or damage.
6
Check the vehicle’s software version to ensure it is updated to the latest version.

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
•Electrical contact cleaner

Parts Required

•Headlight bulbs (H11 or as specified for Model S)
•Replacement headlight switch (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the headlight switch for proper operation and ensure it is in the correct position.
2
Check the vehicle's battery voltage to ensure it is within the operational range.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Verify headlight bulbs are not burned out by inspecting visually or testing with a multimeter.
5
Inspect wiring and connectors for any signs of corrosion or damage.
6
Check the vehicle’s software version to ensure it is updated to the latest version.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the vehicle from the charging station.

2. Check Headlight Switch

Step 1: Turn the vehicle on and set the headlight switch to the "On" position.
Step 2: Listen for an audible click; if no click is heard, the switch may be faulty and require replacement.

3. Inspect Headlight Bulbs

Step 1: Open the front trunk (frunk) and locate the headlight assembly.
Step 2: Remove the headlight cover by unscrewing any retaining screws or clips.
Step 3: Carefully pull out the bulb socket from the headlight assembly.
Step 4: Inspect the filament of the bulb; if burnt out, replace it with a compatible bulb (e.g., H11 for low beam).
Step 5: Reassemble the headlight assembly and cover.

4. Check Wiring and Connectors

Step 1: Visually inspect the wiring harness leading to the headlights for any frays or breaks.
Step 2: Disconnect the wiring connector from the headlight and inspect for corrosion or damage.
Step 3: Clean the connector terminals with electrical contact cleaner.
Step 4: Reconnect the wiring and ensure it is secure.

5. Software Update

Step 1: Connect the vehicle to Wi-Fi and navigate to the software update section on the touchscreen.
Step 2: Check for any available updates and install them if necessary.
Step 3: Restart the vehicle after the update is complete.