900 S Coupe L4-2290cc 2.3L DOHC (1995)
Door Sensor/Switch (For Alarm): Description and Operation
Door Switches
The switches (for interior lighting) are included in the 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) via the car's Integrated Central Electronics (ICE)
control module. The luggage compartment switch is connected directly via the car cable assembly to pin 3 on the alarm control module. The control
module then senses if a door is opened when the alarm is armed by monitoring the voltage over 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.
