RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Door Switch: Description and Operation
DOOR AJAR SWITCH
The door ajar switches are integral to the door latches on each door The switches close a path to ground for the Instrument Cluster when a door is
opened.
The door ajar switches cannot be repaired and, if faulty or damaged, the door latch unit must be replaced. Refer to the Body section under Doors
for the removal and installation procedure.
The door ajar switches close a path to ground for the Instrument Cluster when a door is opened. The passenger front door is connected in a
parallel-series circuit between ground and the Instrument Cluster, while the driver side front door ajar switch is connected in series between
ground and the Instrument Cluster to provide a unique input. The Instrument Cluster reads the switch status, then sends the proper switch status
messages to other electronic modules over the Programmable Communications Interface (PCI) data bus network. The door ajar switches can be
diagnosed using conventional diagnostic tools and methods. Refer to the Body section under Doors for the Removal and Installation procedures.
