my Tesla Model S Plaid/Refresh (2021-present) interior lights won't turn off

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

522 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights not turning off in Tesla Model S Plaid. 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.

Symptoms

•Interior lights remain illuminated continuously
•Dome light stays on even with doors closed
•Possible battery drain due to lights being on
•No response from light control settings in the infotainment system
•Alerts or notifications related to lighting system on the dashboard

Diagnostic Steps

1
Check the vehicle's settings in the infotainment system to ensure interior lights are set to the desired state.
2
Inspect door switches for proper operation; ensure they are not stuck or malfunctioning.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Verify if the interior lights turn off when the vehicle is locked or in sleep mode.
5
Test the vehicle’s battery voltage to check for anomalies indicating a potential electrical issue.

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
•Screwdriver set
•Flashlight

Parts Required

•Door switch (if found faulty)
•Light control module (if needed)

Related Faults

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Diagnostic Steps

1
Check the vehicle's settings in the infotainment system to ensure interior lights are set to the desired state.
2
Inspect door switches for proper operation; ensure they are not stuck or malfunctioning.
3
Use an OBD-II scanner to check for any error codes related to the lighting system.
4
Verify if the interior lights turn off when the vehicle is locked or in sleep mode.
5
Test the vehicle’s battery voltage to check for anomalies indicating a potential electrical issue.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, screwdriver set, and flashlight.
Ensure the vehicle is parked securely and the ignition is off to avoid electrical shock.

2. Inspect Door Switches

Sub-steps:
1. Open each door and locate the door switch (usually near the door hinge).
2. Manually press the switch to ensure it clicks and returns properly.
3. If a switch is found to be faulty, replace it with a new one.
Tools Required: Screwdriver set for removing door panels if needed.

3. Reset Interior Light Settings

Sub-steps:
1. Access the vehicle's infotainment system.
2. Navigate to the 'Lights' settings.
3. Toggle the interior lights setting off and then back on.
4. Ensure the ‘Auto’ setting is enabled for lights where applicable.
Tools Required: None

4. Check and Replace Faulty Components

Sub-steps:
1. Use the OBD-II scanner to clear any error codes related to the lighting system.
2. If codes persist, identify the specific component causing the issue (e.g., light control module).
3. Replace the faulty component as per manufacturer specifications.
Tools Required: OBD-II scanner, replacement component.

5. Test Battery Voltage

Sub-steps:
1. Use a multimeter to check the vehicle battery voltage (should be around 12.6 volts when not in use).
2. If voltage is low, consider recharging or replacing the battery.
Tools Required: Multimeter