Grand Cherokee 4WD V8-4.7L VIN N (2000)
Power Door Lock Control Module: Description and Operation
A Driver Door Module (DDM) and a Passenger Door Module (PDM) are used on this model to control and integrate many of the electronic features and
functions of the vehicle. The door modules are mounted to the inside surface of the trim panel on each front door. The only visible parts of the door
modules are the switches and the bezel that are located on the outside of each front door trim panel. Each door module houses both the front power lock
and power window switches. The DDM also houses individual switches for each passenger door power window, a power window lockout switch and the
power mirror switch. The remainder of both door modules is concealed behind the front door trim panels.
The DDM and PDM each contain a central processing unit and interface with each other; as well as with other electronic modules in the vehicle over the
Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This helps to
reduce wire harness complexity, reduce internal controller hardware, and reduce component sensor current loads. At the same time, this system provides
increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities.
The circuitry of the door modules controls the following hard wired outputs:
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Door and liftgate power lock motors
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Front and rear door power window motors
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Front door courtesy lamps
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Power mirror control and heating
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Rear door power window switch control and illumination.
The door modules also receive the following hard wired inputs:
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Front door ajar switch
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Front door power window switches
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Memory switch (with the Memory System option only)
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Power lock switches
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Power mirror position potentiometers (with the Memory System option only)
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Power mirror switches
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Power window lockout switch.
In addition, the DDM contains the program logic for the optional Memory System, while the PDM contains the program logic and the receiver for the
standard Remote Keyless Entry (RKE) System.
For diagnosis of the DDM, PDM, or the PCI data bus network, a DRB scan tool and the proper Diagnostic Procedures are recommended. The DDM and
the PDM cannot be adjusted or repaired and, if damaged or faulty, they must be replaced.
The functions and features provided by the door modules are possible because of their hard wired inputs and outputs, as well as the resources they share
with each other and with the other electronic modules in the vehicle through their communication over the PCI data bus network. The door modules use
their internal programming and all of these inputs to decide which functions they should perform and both the standard and optional features they should
provide.
