why are my Tesla Model S Original (2012-2020) headlights dimming while driving

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

503 words

Problem Statement

Learn how to diagnose and fix dimming headlights 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 the electrical system.
•Allow the vehicle to cool down before inspecting any components.

Symptoms

•Headlights appear noticeably dimmer than usual
•Dimming occurs intermittently or consistently
•Dashboard lights may also flicker or dim
•Increased frequency of 'Low Beam' warning messages
•Possible decrease in battery range or performance

Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or failure.
2
Check the battery voltage and health using a multimeter.
3
Scan the vehicle's computer for any error codes related to the lighting system.
4
Examine the headlight wiring harness for corrosion or loose connections.
5
Verify the settings in the vehicle’s software for headlight brightness adjustment.
6
Test the headlight relay for proper operation.

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

•Screwdriver set
•Multimeter
•Wire brush
•Relay puller (if necessary)
•Gloves

Parts Required

•Headlight bulbs (specific to Tesla Model S)
•Replacement relay (if faulty)

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Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or failure.
2
Check the battery voltage and health using a multimeter.
3
Scan the vehicle's computer for any error codes related to the lighting system.
4
Examine the headlight wiring harness for corrosion or loose connections.
5
Verify the settings in the vehicle’s software for headlight brightness adjustment.
6
Test the headlight relay for proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface, turn off the ignition, and engage the parking brake.

2. Inspect and Replace Headlight Bulbs

Sub-steps:
1. Open the front trunk and remove the access cover to the headlights.
2. Disconnect the electrical connectors from the headlight bulbs.
3. Remove the old bulbs by turning them counter-clockwise.
4. Install new bulbs (ensure they are of the correct type for the Tesla Model S).
5. Reconnect the electrical connectors and replace the access cover.
Tools Required: Screwdriver set, gloves (to avoid touching the bulb glass).

3. Check Battery Voltage and Health

Sub-steps:
1. Use a multimeter to measure the battery voltage. It should be above 12.4 volts when the vehicle is off and above 13.5 volts when running.
2. If the battery voltage is low, consider replacing or recharging the battery.
Tools Required: Multimeter.

4. Inspect Wiring and Connectors

Sub-steps:
1. Visually inspect the wiring harness leading to the headlights for damage or corrosion.
2. Tighten any loose connections and clean corroded terminals with a wire brush.
Tools Required: Wire brush, dielectric grease.

5. Test Headlight Relay

Sub-steps:
1. Locate the headlight relay in the fuse box.
2. Remove the relay and test it with a multimeter to ensure it operates correctly (check for continuity).
3. Replace the relay if it is faulty.
Tools Required: Multimeter, relay puller (if necessary).