Pacifica V6-3.8L VIN L (2005)
Door Module: Description and Operation
A door module is located behind the trim panel of each front door. The module on the driver side is referred to as the Driver Door Module (DDM), while
the module on the passenger side is the Passenger Door Module (PDM). Each door module houses both the front power lock and power window
switches. In addition to the power window and power lock switches for its own door, the DDM also houses individual switches for each passenger door
power window, a power window lockout switch and the power mirror switch.
The DDM and PDM each utilize integrated circuitry and information carried on the Programmable Communications Interface (PCI) data bus network
along with many hard wired inputs to monitor many sensor and switch inputs throughout the vehicle. The DDM and PDM control and integrate many
functions and features of the vehicle through both hard wired outputs and messages over the PCI data bus. The functions and features of the DDM
include the following:
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Auto unlock
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Automatic (Rolling Door Locks)
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Central lock from the key cylinder (driver door only)
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Central unlock from key cylinder and auto unlock on exit (driver door only)
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Driver front window and driver rear window, including express down for both
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Driver memory mirror
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Driver power mirror
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Driver heated mirror
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Door key cylinder disarm on central unlock (driver door only)
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Door lock inhibit
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Memory system master - Sends a PCI bus message to the radio, MHSAPM, and PDM to tell them to set (store) a memory location or to
recall a memory location.
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Power door lock
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Switch learning features
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Window lockout feature for all passenger power windows
The functions and features of the PDM include the following:
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Power door locks
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Passenger front and rear window including express down for both
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Passenger memory mirror
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Passenger power mirror
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Passenger heated mirror
The door modules are serviced only as complete units. If a door module is damaged or faulty, the entire door module unit must be replaced.
The microprocessor-based DDM and PDM hardware and software monitors integral and hard wired external switch inputs as well as those resources it
shares with other electronic modules in the vehicle through its communication over the PCI data bus network. The internal programming and all of these
inputs allow the DDM or PDM microprocessor to determine the tasks it needs to perform and their priorities, as well as both the standard and optional
features that it should provide.