my Tesla Model S Plaid/Refresh (2021-present) headlights won't turn on, what might be the issue?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

532 words

Problem Statement

Learn how to diagnose and fix non-functioning headlights on Tesla Model S Plaid. 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 vehicle's battery before working on electrical components to avoid shock or short circuits.

Symptoms

•Headlight switch does not illuminate
•No response when switching headlights on
•Dashboard warning light for exterior lights is illuminated
•Automatic headlight feature is not engaging
•Possible flickering of lights before failure

Diagnostic Steps

1
Check the headlight switch settings in the vehicle's touchscreen interface.
2
Inspect the vehicle's fuses related to the headlight circuit using the owner's manual for fuse location.
3
Use the Tesla app or onboard diagnostics to check for any error codes related to lighting.
4
Visually inspect the headlight assemblies for any signs of damage or corrosion.
5
Test the voltage at the headlight connectors with a multimeter to ensure proper power is reaching the headlights.
6
Verify the function of any related control modules, such as the Body Control Module (BCM).

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
•Flat-head screwdriver

Parts Required

•Headlight bulbs (if needed)
•Replacement fuses (if blown)

Related Faults

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Diagnostic Steps

1
Check the headlight switch settings in the vehicle's touchscreen interface.
2
Inspect the vehicle's fuses related to the headlight circuit using the owner's manual for fuse location.
3
Use the Tesla app or onboard diagnostics to check for any error codes related to lighting.
4
Visually inspect the headlight assemblies for any signs of damage or corrosion.
5
Test the voltage at the headlight connectors with a multimeter to ensure proper power is reaching the headlights.
6
Verify the function of any related control modules, such as the Body Control Module (BCM).

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, and a flat-head screwdriver.
Ensure vehicle is in a safe location and powered off.

2. Inspect and Replace Fuses

Locate the fuse box as per the owner's manual.
Remove the cover and identify the headlight fuses.
Use a fuse puller to remove the fuses and inspect for continuity.
Replace any blown fuses with new ones of the same amperage (typically 15A for headlights).

3. Check Headlight Assemblies

Remove the screws holding the headlight assembly in place.
Gently pull the assembly out and disconnect the wiring harness.
Inspect the connectors for any damage or corrosion; clean or replace as necessary.
Replace the headlight bulb if it appears burnt out or damaged.

4. Test Voltage at Connectors

Reconnect the wiring harness to the headlight assembly.
Use a multimeter to test voltage at the headlight connectors while the headlight switch is engaged.
If there is no voltage, further diagnose the wiring or control module.

5. Reprogram or Replace Control Module (if necessary)

If all previous steps check out, connect the OBD-II scanner to check for BCM error codes.
If codes indicate a BCM issue, reprogram the module using Tesla's service tools or replace the module as needed.