It monitors ignition and if ignition turned on the light fades as soon as the door is closed.
Car interior light delay unit.
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Car interior fading light demo duration.
This circuit may be used to automatically switch off an interior car light with a time delay of 15 seconds or 3 minutes.
The red wire of the light delay connects to the red wire of the car light.
The interior lamp control module is located under the center of the instrument panel on the dash of your vehicle.
By activating the manual switch or opening the door q2 turns on for an instant in order to lead the output to the high level.
Check the next pictures.
The black wire of the light unit connects to the white black wire of the car light.
When the door closes and the dome light would normally turn off the dome light dimmer module takes control and holds the dome light on for a few seconds the delay feature.
The light goes on.
This delay gives you the time to gather the seat belts find the ignition slot with the key etc.
Look for any ground wires to the interior light circuits to see if they are loose.
If all the wiring looks in good condition i recommend replacing the interior lamp control module.
The light is controlled by a manual and a door switch.