The sensor typically uses a switch with a spring loaded plunger that is compressed when the door is closed and is released when the door is open.
Door open sensor car.
We have you covered with everything from ignition passlock sensors to door open warning sensors for your specific car.
Do this for all doors.
Last night after cleaning out my car i closed all the doors then tried to lock it and the extra long beep went off which usually only happens if my keys are in the car or if the doors are opened.
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Each door in your car is equipped with a sensor that can tell whether that door is open or securely closed.
Trunk locks usually have a spring loaded switch that opens or closes the electrical signal depending on the status of the door.
Other car door sensors operate on the same principle except the sensor system may be different.
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If your car had an alarm system it may employ a shock sensor that can shake based on whether your car was touched.