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

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

582 words

Problem Statement

Learn how to diagnose and fix rear lights not working 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

•Disconnect the battery before working on electrical components to prevent shock.
•Allow the vehicle to cool before working on any components near the rear lights.

Symptoms

•Rear lights not illuminating when headlights are on
•No response when brake pedal is pressed
•Warning message on the dashboard indicating a lighting issue
•Turn signal lights not functioning
•Potential flickering or intermittent operation of rear lights

Diagnostic Steps

1
Inspect the rear light bulbs for any visible signs of damage or burnout.
2
Check the fuse related to the rear lights using the vehicle's fuse box diagram.
3
Use a multimeter to test for power at the rear light connectors.
4
Verify the functionality of the brake light switch.
5
Scan for any error codes using the Tesla service menu or an OBD-II scanner to identify potential electrical faults.

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

•Multimeter
•Socket set
•Fuse puller
•Screwdriver set

Parts Required

•Replacement light bulbs (if needed)
•Replacement fuse (if blown)
•Replacement brake light switch (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the rear light bulbs for any visible signs of damage or burnout.
2
Check the fuse related to the rear lights using the vehicle's fuse box diagram.
3
Use a multimeter to test for power at the rear light connectors.
4
Verify the functionality of the brake light switch.
5
Scan for any error codes using the Tesla service menu or an OBD-II scanner to identify potential electrical faults.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface, and the ignition is off.
Disconnect the 12V battery to prevent electrical shock.

2. Inspect and Replace Bulbs

Sub-steps:
1. Open the trunk and locate the rear light assembly.
2. Remove the rear light cover by unscrewing or unclipping it.
3. Carefully pull the light bulb socket out and inspect the bulb.
4. If the bulb is burnt out, replace it with a new one (ensure it matches the specifications).
5. Reinsert the bulb socket and replace the rear light cover.

3. Check and Replace Fuse

Sub-steps:
1. Locate the fuse box based on the owner's manual (usually found under the dashboard or in the trunk).
2. Identify the fuse connected to the rear lights.
3. Pull the fuse out using fuse pullers and inspect it for continuity.
4. If the fuse is blown, replace it with a new fuse of the same amperage.
5. Reassemble the fuse box cover.

4. Test Power at Connectors

Sub-steps:
1. Reconnect the battery and turn on the ignition.
2. Use a multimeter to check for voltage at the rear light connector while the headlights are on.
3. If there is no voltage, trace the wiring back to the source for any breaks or shorts.

5. Replace Brake Light Switch (if necessary)

Sub-steps:
1. Locate the brake light switch under the dashboard near the brake pedal.
2. Disconnect the wiring harness from the switch.
3. Remove the switch using a socket set.
4. Install the new switch and reconnect the wiring harness.
5. Test the brake lights again after reassembly.