Electronic Alarm Auto Schema simple NE555 based CI: S0 open activates the alarm, the door contacts S1 to S4 are normally closed, out of the car you have a few seconds determined by R1, C1, and then if the we opens a door has 3 seconds R2, C2 S0 to operate before the relay triggers an alarm when tripped over the fact that closed the doors n 'not stop the alarm, only S0 closed position cuts the alarm. (S0 contact may be a shunt on DIN socket)
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