my Tesla Model S Original (2012-2020) headlights flicker when driving at night what's wrong

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

566 words

Problem Statement

Learn how to diagnose and fix flickering headlights in Tesla Model S (2012-2020). 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 the vehicle to cool down before inspecting headlight components.

Symptoms

•Headlights flicker intermittently
•Possible dimming of dashboard lights
•Increased frequency of flickering at higher speeds
•No error messages or warning lights on the dashboard
•Possible unusual sounds from the headlight assembly

Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or damage.
2
Check the headlight wiring harness for loose connections or fraying.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Test the vehicle’s battery voltage and charging system.
5
Examine the headlight relay for proper operation.
6
Measure the voltage at the headlight terminals under load with a multimeter.

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
•Electrical cleaner

Parts Required

•Headlight bulbs (if damaged)
•Headlight relay (if faulty)
•Wiring harness (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or damage.
2
Check the headlight wiring harness for loose connections or fraying.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Test the vehicle’s battery voltage and charging system.
5
Examine the headlight relay for proper operation.
6
Measure the voltage at the headlight terminals under load with a multimeter.

Solution

1. Preparation

Gather tools and materials: OBD-II scanner, multimeter, socket set, replacement bulbs (if needed), and electrical cleaner.
Ensure the vehicle is parked on a flat surface and the ignition is off.

2. Inspect and Replace Bulbs

Sub-steps:
1. Open the front hood and locate the headlight assembly.
2. Remove the headlight cover by unscrewing the retaining screws.
3. Pull the bulb socket out of the headlight assembly.
4. Inspect the bulb for filament breakage or discoloration.
5. If damaged, replace with a new bulb (ensure it matches OEM specifications).
6. Reinsert the bulb socket and secure the headlight cover.

3. Check Wiring and Connections

Sub-steps:
1. Visually inspect the wiring harness connected to the headlights.
2. Look for any signs of fraying, corrosion, or loose connectors.
3. If any damage is found, repair or replace the wiring harness as necessary.
4. Use electrical cleaner to clean any corroded connections.

4. Test and Replace Relay (if necessary)

Sub-steps:
1. Locate the headlight relay in the fuse box (refer to the owner's manual for exact location).
2. Remove the relay and inspect for damage or corrosion.
3. Test the relay using a multimeter for continuity.
4. If faulty, replace with a new relay, ensuring it matches the specifications.

5. Battery and Charging System Check

Sub-steps:
1. Use a multimeter to check the battery voltage; it should be around 12.6 volts when the vehicle is off.
2. Start the vehicle and check the voltage again; it should be between 13.7 to 14.7 volts.
3. If the voltage is outside the specified range, test the alternator and battery for faults.