Door Sensor/Switch (For Alarm): Description and Operation

The Vehicle Theft Security System (VTSS) uses the door ajar switches to provide an input to the Body Control Module (BCM). These switches are normally OPEN with the doors closed. When a door is opened, the switch CLOSES and completes a path to ground. Circuit G74 is used to monitor the right front door. The G75 circuit is used for the left front door.