how to fix Tesla Model 3 Original (2017-2023) rear lights not working

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

529 words

Problem Statement

Learn how to diagnose and fix rear lights not working on Tesla Model 3 (2017-2023). 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 to prevent shorts and electrical shocks.

Symptoms

•Rear tail lights not illuminating
•Brake lights not activating
•Turn signal lights not working
•Dashboard warning light for lighting system illuminated
•No response when activating lights through the vehicle's controls

Diagnostic Steps

1
Check the vehicle settings via the touchscreen to ensure rear lights are set to 'on' and not in a custom mode.
2
Inspect the rear light assemblies for any visible damage or corrosion.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Test the voltage at the rear light connectors with a multimeter to ensure power is reaching the lights.
5
Verify the condition of the fuses related to the rear lighting circuit, checking for any blown fuses.
6
Perform a visual inspection of the wiring harness leading to the rear lights for fraying or disconnections.

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

•Socket set
•Multimeter
•OBD-II scanner
•Fuse puller
•Screwdrivers

Parts Required

•Replacement bulbs (as needed)
•Fuses (as needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the vehicle settings via the touchscreen to ensure rear lights are set to 'on' and not in a custom mode.
2
Inspect the rear light assemblies for any visible damage or corrosion.
3
Use an OBD-II scanner to check for any fault codes related to the lighting system.
4
Test the voltage at the rear light connectors with a multimeter to ensure power is reaching the lights.
5
Verify the condition of the fuses related to the rear lighting circuit, checking for any blown fuses.
6
Perform a visual inspection of the wiring harness leading to the rear lights for fraying or disconnections.

Solution

1. Preparation

Tools Required: Socket set, multimeter, OBD-II scanner, fuse puller, screwdrivers.
Disconnect the vehicle's 12V battery to ensure safety while working on the electrical components.

2. Inspect and Replace Fuses

Locate the fuse box, typically found under the dashboard or in the trunk area.
Using a fuse puller, check the fuses related to the rear lights (consult the owner's manual for specific fuse locations).
If any fuses are blown, replace them with the appropriate amperage fuses (usually 10A or 15A as specified in the manual).

3. Test and Replace Bulbs

Remove the rear light assembly by unscrewing the retaining screws and gently pulling it away from the vehicle.
Inspect the bulbs for any signs of damage or burnt filaments.
If necessary, replace the bulbs with new ones, ensuring they are rated for the Model 3.

4. Repair Wiring and Connectors

If the wiring harness is found frayed or damaged, carefully splice the wiring using appropriate electrical connectors.
Ensure that all connections are secure and insulated to prevent short circuits.

5. Reassemble and Reconnect

Reinstall the rear light assembly, ensuring it is securely fastened with screws.
Reconnect the 12V battery and check for any loose connections in the lighting system.