why does my Tesla Model S Original (2012-2020) headlights flicker when driving

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 words

Problem Statement

Learn how to diagnose and fix flickering headlights on your 2012-2020 Tesla Model S. 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.
•Allow headlight bulbs to cool before handling.

Symptoms

•Headlights flickering intermittently
•Dashboard warning lights illuminated
•Dimming of interior lights when headlights flicker
•Possible noticeable changes in headlight brightness

Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner for any error codes related to the lighting system.
2
Inspect the headlight assembly for moisture or physical damage.
3
Check the headlight bulbs for signs of wear or failure.
4
Test the headlight relay for proper operation using a multimeter.
5
Inspect the wiring harness and connections for corrosion or loose connections.
6
Measure the battery voltage while the headlights are on to ensure proper voltage is being supplied.

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
•Screwdrivers
•Wire brush
•Electrical cleaner

Parts Required

•Replacement headlight bulbs
•Headlight relay

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Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner for any error codes related to the lighting system.
2
Inspect the headlight assembly for moisture or physical damage.
3
Check the headlight bulbs for signs of wear or failure.
4
Test the headlight relay for proper operation using a multimeter.
5
Inspect the wiring harness and connections for corrosion or loose connections.
6
Measure the battery voltage while the headlights are on to ensure proper voltage is being supplied.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Replace Headlight Bulbs

Inspect Bulbs: Remove the headlight assembly by locating the retaining screws or clips that hold it in place.
Replace Bulbs: If a bulb shows signs of failure or flickering, replace it with a new bulb of the same type (e.g., LED or halogen, depending on the model).
- Tools Required: Socket set, screwdrivers
- Safety Warnings: Handle bulbs carefully to avoid oil from fingers on the glass; allow bulbs to cool before handling.

3. Check and Replace Headlight Relay

Locate Relay: Identify the headlight relay in the fuse box according to the owner’s manual.
Test Relay: Using a multimeter, check for continuity. Replace the relay if it is faulty.
- Tools Required: Multimeter, pliers
- Safety Warnings: Ensure the ignition is off before working on electrical components.

4. Repair Wiring Connections

Inspect Connections: Check the wiring harness for corrosion or loose connections. Clean any corrosion with electrical cleaner.
Secure Connections: Reconnect any loose wires and ensure a tight connection.
- Tools Required: Wire brush, electrical cleaner, dielectric grease
- Safety Warnings: Ensure the vehicle is powered off while inspecting wiring.

5. Reassemble and Test

Reinstall the headlight assembly and ensure all screws and clips are secured.
Reconnect the negative battery terminal.
Turn on the vehicle and test the headlights for proper operation.