how to diagnose why my Tesla Model S Original (2012-2020) interior lights stay on

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

534 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock or short circuits.

Symptoms

•Interior lights stay on continuously
•Door open warning light illuminated on the dashboard
•Lights flicker when the vehicle is in motion
•Battery drain observed over time
•Difficulty in getting the lights to turn off manually

Diagnostic Steps

1
Inspect all doors and trunk for proper closure and alignment.
2
Use the Tesla app or onboard controls to check for any active alerts or notifications related to the interior lighting.
3
Verify if the interior light settings in the touchscreen are set to 'Auto' or 'On.'
4
Scan the vehicle’s system for error codes using Tesla's diagnostic tools.
5
Check the door sensor switches for continuity using a multimeter.
6
Inspect the wiring harnesses related to the interior lighting and door sensors for damage or corrosion.

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 compatible with Tesla
•Multimeter
•Basic hand tools

Parts Required

•Replacement door sensor switches (if faulty)
•Wiring harness connectors (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect all doors and trunk for proper closure and alignment.
2
Use the Tesla app or onboard controls to check for any active alerts or notifications related to the interior lighting.
3
Verify if the interior light settings in the touchscreen are set to 'Auto' or 'On.'
4
Scan the vehicle’s system for error codes using Tesla's diagnostic tools.
5
Check the door sensor switches for continuity using a multimeter.
6
Inspect the wiring harnesses related to the interior lighting and door sensors for damage or corrosion.

Solution

1. Preparation

Tools Required: OBD-II scanner compatible with Tesla, multimeter, basic hand tools.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the 12V battery to avoid any electrical hazards.

2. Inspect Door Sensor Switches

Locate the door sensors (typically found near the door latch).
Sub-steps:
1. Remove the door panel if necessary to access the sensor.
2. Disconnect the electrical connector from the sensor.
3. Use a multimeter to test the sensor for continuity when the door is closed.
4. Replace the sensor if it does not show continuity when in the closed position.

3. Check Wiring and Connectors

Inspect the wiring harness for any signs of wear, cuts, or corrosion.
Sub-steps:
1. Follow the wiring from each door sensor to the central control unit.
2. Repair any damaged wiring or connectors as needed.
3. Ensure all connections are secure and free of corrosion.

4. Reset the Lighting Control System

After repairs, reconnect the battery.
Sub-steps:
1. Power on the vehicle.
2. Navigate to the vehicle settings on the touchscreen.
3. Perform a factory reset of the lighting system if available.
4. Test the interior lights to ensure they turn off as expected.