how to resolve door ajar warning in my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools: multimeter, screwdriver set, and cleaning supplies.
• Ensure the vehicle is parked on a level surface and turned off.
• Disconnect the 12V battery for safety before working on electrical components.

2. Inspect and Clean Door Latches

• Open each door and inspect the latch mechanism for dirt or debris.
• Use a cloth and a suitable cleaner to remove any buildup.
• Verify that the latch operates smoothly when engaged and disengaged.

3. Check Door Sensors

• Locate the door sensor in the door frame.
• Use a multimeter to test the continuity of the sensor wire.
  • If continuity is not present, trace the wiring for damage.
• If the sensor is faulty, proceed to replace it.

4. Replace Faulty Door Sensor

• Remove the door panel if necessary:
  • Remove screws and clips securing the panel.
  • Carefully pull the panel away from the door frame.
• Disconnect the old door sensor wiring harness.
• Install the new door sensor, ensuring it is seated correctly.
• Reconnect the door panel and secure with screws and clips.

5. Reconnect Battery and Test

• Reconnect the 12V battery.
• Start the vehicle and check if the "door ajar" warning is cleared.
• Manually open and close each door to ensure the sensors are functioning.