how to fix the rear lights on my Tesla Model 3 Original (2017-2023) that won’t turn on

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

critical

Severity

3 min read

528 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix rear lights not turning on in Tesla Model 3 (2017-2023). 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

•Always disconnect the vehicle battery before working on electrical components to prevent short circuits.

Symptoms

•Rear lights do not illuminate when headlights are turned on
•Turn signal indicators may not function properly
•Brake lights are unresponsive when the brake pedal is pressed
•Warning messages related to lighting may appear on the dashboard
•Possible flickering of lights when attempting to activate

Diagnostic Steps

1
Inspect the rear light assembly for visible damage or corrosion.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Verify the operation of the light switch and ensure it is in the correct position.
4
Check the fuses related to the rear lights in the fuse box.
5
Test the voltage at the light connectors using a multimeter to ensure power is reaching the lights.
6
Ensure the vehicle's software is up to date, as lighting issues can sometimes be software-related.

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
•Flathead screwdriver

Parts Required

•Replacement bulbs (if necessary)
•Replacement fuse (if necessary)

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Symptoms

•Rear lights do not illuminate when headlights are turned on

•Turn signal indicators may not function properly

•Brake lights are unresponsive when the brake pedal is pressed

•Warning messages related to lighting may appear on the dashboard

•Possible flickering of lights when attempting to activate

Diagnostic Steps

1
Inspect the rear light assembly for visible damage or corrosion.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Verify the operation of the light switch and ensure it is in the correct position.
4
Check the fuses related to the rear lights in the fuse box.
5
Test the voltage at the light connectors using a multimeter to ensure power is reaching the lights.
6
Ensure the vehicle's software is up to date, as lighting issues can sometimes be software-related.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, multimeter, socket set, and a flathead screwdriver.
Ensure the vehicle is parked on a flat surface with the ignition turned off.

2. Inspect and Clean Connections

Remove the rear light assembly by unscrewing the retaining screws.
Disconnect the light connector from the assembly.
Inspect the connector for corrosion or damage. Clean any corrosion using electrical contact cleaner.
Reconnect the connector and ensure it is secure before reinstalling the assembly.

3. Replace Faulty Components

If the multimeter testing indicates no voltage, locate the corresponding fuse in the fuse box.
- Remove the fuse using a fuse puller or pliers.
- Inspect the fuse for continuity; if the filament is broken, replace it with a new fuse of the same amperage.
If the light bulbs are burnt out, replace them with identical bulbs.
- To replace, twist and pull out the bulb socket from the assembly, then replace the bulb and reinsert the socket.

4. Software Update (if applicable)

Connect the vehicle to Wi-Fi and check for any available software updates through the Tesla app or vehicle interface.
Follow the prompts to install any updates that may address the lighting issue.