OPERATION
DOOR
The door ajar switches are actuated by the mechanisms internal to the door latch. When a door is closed and properly latched, its door ajar switch is an open circuit. When a door is open or only partially latched, the door ajar switch is a closed circuit.
The door ajar switches are hard wired between a body ground and the Body Control Module (BCM). The front door ajar switches are connected to the BCM through a driver or passenger door ajar switch sense circuit, while the rear door ajar switches are connected to the BCM through a left or right rear door ajar switch sense circuit. The BCM reads the door ajar switch status through an internal pull-up, then sends electronic door ajar switch status messages to the ElectroMechanical Instrument Cluster (EMIC) over the Programmable Communications Interface (PCI) data bus and uses these inputs to control many electronic functions and features of the vehicle.
The door ajar switches as well as the hard wired inputs and outputs of the switches may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
FLIP-UP GLASS
The flip-up glass ajar switch is actuated by the flip-up glass latch mechanism. When the flip-up glass is closed and properly latched, the flip-up glass ajar switch is an open circuit. When the flip-up glass is open or only partially latched, the flip-up glass ajar switch is a closed circuit.
The flip-up glass ajar switch is hard wired between a body ground and both the Body Control Module (BCM) and the rear wiper motor. The output of the switch is connected to the BCM and rear wiper motor through a flip-up glass ajar switch sense circuit. The BCM reads the flip-up glass ajar switch status through an internal pull-up, then sends electronic flip-up glass ajar switch status messages to the ElectroMechanical Instrument Cluster (EMIC) over the Programmable Communications Interface (PCI) data bus and uses this input to control many electronic functions and features of the vehicle. The rear wiper motor uses this input to restrict rear wiper operation when the flip-up glass is ajar.
The flip-up glass ajar switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
TAILGATE
The tailgate switch is actuated by the mechanism internal to the tailgate latch. When the tailgate is closed and properly latched, the tailgate ajar switch is an open circuit. When the tailgate is open or only partially latched, the tailgate ajar switch is a closed circuit.
The tailgate ajar switch is hard wired between a body ground and the Body Control Module (BCM). The output of the switch is connected to the BCM through a tailgate ajar switch sense circuit. The BCM reads the tailgate ajar switch status through an internal pull-up, then sends electronic tailgate ajar switch status messages to the ElectroMechanical Instrument Cluster (EMIC) over the Programmable Communications Interface (PCI) data bus and uses this input to control many electronic functions and features of the vehicle.
The tailgate ajar switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.