9000 Aero L4-2290cc 2.3L DOHC Turbo EFI HO (1997)
Door Sensor/Switch (For Alarm): Description and Operation
The switches (for interior lighting) are included in the anti-theft alarm as sensors for doors and tailgate. The switches are mounted in the body, in the
middle of each door and the tailgate. All door switches are connected to the alarm control module (pin 4) and the luggage compartment switch (pin 3) via
the car's wiring harness. The control module then senses if a door is opened when the alarm is armed by monitoring the voltage across the switch as
follows:
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When the door/tailgate is closed, the voltage between the switch and ground should be +12 V.
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The switch is grounded when the door/tailgate is opened. The voltage between the switch and ground is then 0 V. The alarm is set off.
The electronic control module senses via pin 18 whether the door is open or not and if it is prevents the alarm from being armed.
