my Tesla Model S Plaid/Refresh (2021-present) rear lights not working why is that happening

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

527 words

Problem Statement

Learn how to diagnose and fix rear lights not working on Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shorts or shocks.
•Allow the vehicle to cool down if it has been in operation before performing any inspections.

Symptoms

•Rear lights do not illuminate when the vehicle is in operation
•Brake lights are unresponsive
•No turn signal indication from the rear
•Warning message on the dashboard related to lighting
•Possible flickering of other lights when activated

Diagnostic Steps

1
Inspect the vehicle's settings to ensure rear lights are not disabled via the touchscreen.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Visually inspect the rear light assemblies for any obvious damage or disconnection.
4
Check the fuses related to the rear lighting circuit in the fuse box.
5
Test the wiring harness leading to the rear lights for continuity and signs of damage.
6
Inspect the LED modules in the rear lights for failure or malfunction.

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
•Socket set
•Multimeter
•Fuse puller

Parts Required

•Replacement fuses
•Replacement LED modules

Related Faults

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Diagnostic Steps

1
Inspect the vehicle's settings to ensure rear lights are not disabled via the touchscreen.
2
Use an OBD-II scanner to check for any error codes related to the lighting system.
3
Visually inspect the rear light assemblies for any obvious damage or disconnection.
4
Check the fuses related to the rear lighting circuit in the fuse box.
5
Test the wiring harness leading to the rear lights for continuity and signs of damage.
6
Inspect the LED modules in the rear lights for failure or malfunction.

Solution

1. Preparation

Ensure the vehicle is parked safely and the ignition is off.
Disconnect the 12V battery to prevent electrical shorts.
Gather tools: socket set, multimeter, and OBD-II scanner.

2. Check Settings

Reconnect the 12V battery.
Access the vehicle’s touchscreen menu.
Navigate to the "Lights" settings and ensure that the rear lights are enabled.

3. Inspect and Replace Fuses

Locate the fuse box (usually found under the dashboard or in the trunk).
Identify the fuse(s) related to the rear lighting (refer to the owner's manual).
Remove the fuse using a fuse puller and inspect for continuity using a multimeter.
Replace any blown fuses with the same amperage.

4. Repair Wiring or Components

If wiring is damaged, carefully remove the rear light assembly.
Inspect the wiring harness for frays or breaks.
If damaged, splice in new wiring or replace the harness.
Reattach the rear light assembly and ensure all connections are secure.

5. Replace LED Modules (if necessary)

If the LED modules are found to be faulty, remove the affected light assembly.
Unscrew and detach the LED module from the assembly.
Replace with a new LED module compatible with the Tesla Model S Plaid.