my Tesla Model S Original (2012-2020) rear lights are out, what could be wrong?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

560 words

Problem Statement

Learn how to diagnose and fix rear lights not working on 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 electrical systems to prevent shocks.
•Allow the vehicle to cool if working near heated components.

Symptoms

•Rear lights are completely off
•Brake lights not illuminating when brakes are applied
•No turn signal indication from rear lights
•Dashboard warning light for exterior lights may be illuminated
•Possible blown fuses related to rear lighting

Diagnostic Steps

1
Inspect the rear light assembly for physical damage or loose connections.
2
Check the fuses related to the rear lights using the vehicle’s fuse box diagram.
3
Use an OBD-II scanner to check for any error codes related to electrical systems.
4
Test the voltage at the rear light connectors with a multimeter.
5
Examine the light bulbs for signs of burnout or failure.
6
Review the vehicle's software for any updates or resets related to the lighting system.

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
•Fuse puller or needle nose pliers
•Screwdriver set

Parts Required

•Replacement bulbs (if needed)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the rear light assembly for physical damage or loose connections.
2
Check the fuses related to the rear lights using the vehicle’s fuse box diagram.
3
Use an OBD-II scanner to check for any error codes related to electrical systems.
4
Test the voltage at the rear light connectors with a multimeter.
5
Examine the light bulbs for signs of burnout or failure.
6
Review the vehicle's software for any updates or resets related to the lighting system.

Solution

1. Preparation

Gather all tools and parts before beginning.
Disconnect the negative battery terminal to prevent electrical shock.
Ensure the vehicle is parked on a level surface with the parking brake engaged.

2. Check and Replace Fuses

Tools required: Fuse puller or needle nose pliers.
Locate the fuse box (usually found in the front trunk area or under the dashboard).
Identify the specific fuse for the rear lights according to the fuse diagram.
Remove the fuse and inspect it for continuity; replace if blown.
- Note: Use a fuse of the same amperage rating.

3. Inspect and Replace Bulbs

Tools required: Screwdriver set (if applicable).
Open the rear light assembly by unscrewing or unclipping.
Remove the bulb holders and check each bulb for damage.
Replace any blown bulbs with new ones of the correct type.
- Note: Ensure bulbs are seated properly in their sockets to avoid poor connections.

4. Test Wiring and Connectors

Tools required: Multimeter.
Reconnect the battery terminal.
With the multimeter, check for voltage at the rear light connectors while the lights are activated.
If no voltage is present, trace the wiring back to the source for breaks or shorts.

5. Software Check

Tools required: OBD-II scanner.
Connect the OBD-II scanner to the vehicle’s port.
Check for any relevant error codes and follow the scanner’s recommended actions.
If necessary, perform a software reset through the scanning tool or the Tesla app.