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 can be diagnosed and tested using conventional diagnostic tools and procedures. Refer
to the appropriate wiring information. However, conventional diagnostic methods may not prove conclusive in the
diagnosis of the BCM, the EMIC, the PCI data bus, or the electronic messaging used to convey flip-up glass ajar
switch status to other modules in the vehicle. The most reliable, efficient, and accurate means to diagnose the BCM,
the EMIC, the PCI data bus, and both the hard wired and electronic message inputs and outputs affected by the
flip-up glass ajar switch inputs requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic infor-
mation.
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 Electro-
Mechanical 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 can be diagnosed and tested using conventional diagnostic tools and procedures. Refer to
the appropriate wiring information. However, conventional diagnostic methods may not prove conclusive in the diag-
nosis of the BCM, the EMIC, the PCI data bus, or the electronic messaging used to convey tailgate ajar switch
status to other modules in the vehicle. The most reliable, efficient, and accurate means to diagnose the BCM, the
EMIC, the PCI data bus, and both the hard wired and electronic message inputs and outputs affected by the tailgate
ajar switch input requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
8L - 178
LAMPS/LIGHTING - INTERIOR
KJ