If your car had an alarm system it may employ a shock sensor that can shake based on whether your car was touched.
Door open sensor car.
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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.
The open door light on my dashboard was blinking so i rechecked every door and closed them all again and it still said they were open.
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We have you covered with everything from ignition passlock sensors to door open warning sensors for your specific car.
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.
Open 1 door at a time and find the door light switch in the door frame it may be under a rubber boot which you can leave on.
It is spring loaded so you can push it in and it will come out by itself when you release it and manually operate and release it a few times to see if you can make the light go on and off.
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.
Trunk locks usually have a spring loaded switch that opens or closes the electrical signal depending on the status of the door.
Do this for all doors.
Other car door sensors operate on the same principle except the sensor system may be different.