how to fix the interior lights staying on in my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface with the ignition off.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect Door Switches

• Tools Required: Torx screwdriver, multimeter
• Remove the door panel using a Torx screwdriver to access the door switch.
• Disconnect the door switch connector and use a multimeter to check for continuity when the switch is pressed.
• If defective, replace the door switch with a new one. Reassemble the panel after replacement.

3. Check Interior Light Switch Settings

• Tools Required: None
• Confirm that the interior light switch is set to the 'Auto' position.
• If the switch is set to 'On', change it to 'Auto' and verify that the lights turn off when doors are closed.

4. Inspect Wiring and Connections

• Tools Required: Wire strippers, electrical tape
• Inspect the wiring harness leading to the door switches for frayed wires or corrosion.
• Repair or replace any damaged wiring and ensure all connections are secure.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal after all repairs are completed.
• Test the interior lights by opening and closing the doors to ensure they operate correctly.