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Door Switch: Description and Operation

CIRCUIT 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 completing a path to ground. Circuit G74 is used to monitor the right front, right rear, and the left rear door. The G75 circuit is used for the left front door.