why is my Tesla Model 3 Original (2017-2023) interior lights staying on all the time

Tesla Model 3 Highland (2024-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

559 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in Tesla Model 3 (2017-2023). Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before performing any electrical work to avoid shocks or shorts.

Symptoms

•Interior lights stay on even when doors are closed
•Battery drain warning displayed on the dashboard
•Dome lights flicker intermittently
•Malfunction indicator light may be illuminated
•Inability to dim or turn off interior lights via settings

Diagnostic Steps

1
Inspect the door switches to ensure they are not stuck or malfunctioning.
2
Check the interior lighting settings on the vehicle's touchscreen for any incorrect configurations.
3
Use the Tesla app to check for any software updates that might address lighting issues.
4
Scan the vehicle for error codes using a Tesla diagnostic tool to identify any faults related to the lighting system.
5
Verify the battery health and state of charge to rule out battery-related issues.

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

•Flathead screwdriver
•Multimeter
•Tesla diagnostic tool

Parts Required

•Replacement door switch
•Wiring connectors

Related Faults

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Diagnostic Steps

1
Inspect the door switches to ensure they are not stuck or malfunctioning.
2
Check the interior lighting settings on the vehicle's touchscreen for any incorrect configurations.
3
Use the Tesla app to check for any software updates that might address lighting issues.
4
Scan the vehicle for error codes using a Tesla diagnostic tool to identify any faults related to the lighting system.
5
Verify the battery health and state of charge to rule out battery-related issues.

Solution

1. Preparation

Gather necessary tools, including a flathead screwdriver and a multimeter.
Ensure the vehicle is parked and safely powered down.
Disconnect the 12V battery to prevent electrical shorts.

2. Inspect Door Switches

Sub-steps:
1. Open each door and locate the door switch (often found near the door latch).
2. Manually press the door switch to see if the interior lights respond; if they remain on, the switch may be faulty.
3. Clean any debris or obstructions around the door switches that could prevent them from closing properly.
4. If necessary, remove the door panel using a flathead screwdriver to access the wiring and inspect for loose connections.

3. Check Interior Lighting Settings

Sub-steps:
1. Power on the vehicle and navigate to the 'Controls' menu on the touchscreen.
2. Select 'Lights' and verify the interior light settings.
3. Make sure the 'Interior Lights' setting is not set to 'Always On'.
4. Reset the settings to default if any anomalies are present.

4. Software Update

Sub-steps:
1. Connect to Wi-Fi and check for software updates via the 'Software' menu on the touchscreen.
2. Install any available updates to ensure the vehicle’s software is up to date.

5. Test and Repair Wiring (if needed)

Sub-steps:
1. Use a multimeter to test the continuity of the door switch wiring.
2. Repair or replace any damaged wiring or connectors found during testing.
3. Reassemble any panels or components removed during inspection.