Grand Cherokee 2WD V8-4.7L VIN J (2004)
Power Door Lock Control Module: Description and Operation
DESCRIPTION
A door module is concealed behind the trim panel of each front door (Door Module).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, the power mirror switch, and the power foldaway mirror switch for export vehicles.
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 PDM also receives inputs through an integral
Radio Frequency (RF) Remote Keyless Entry (RKE) receiver. 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 that the door modules support or control include the
following:
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Automatic Door Lock - The two door modules provide an automatic door lock feature which locks the doors when the vehicle is moving. This is a
programmable feature.
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Automatic Door Unlock On Exit - The two door modules provide an automatic door unlock on exit feature. This feature will unlock all the doors if
they were locked via the automatic door lock feature afier the vehicle has stopped moving and the driver door is opened. This is a programmable
feature via the EVIC.
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Customer Programmable Features - Each door module provides support for certain customer programmable features that are monitored on the PCI
bus.
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Cylinder Lock Switch Status - The DDM monitors and transmits the status of the cylinder lock switch on the driver side front door lock cylinder.
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Door Courtesy Lamp Control - Each door module provides control of its own optional front door-mounted courtesy lamp.
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Door Lock Inhibit - Each door module provides a door lock inhibit feature which prevents the doors from being locked with a power lock switch if
the key was left in the ignition and a front door is open.
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Express-Down Window - The DDM provides an express-down feature for the driver side front door window only.
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Extended Window Operation - Both door modules provide an extended power window operation feature that allows operation of the power
windows for 45 seconds following ignition Off or until a front door is opened.
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Front Door Ajar Switch Status - Each door module monitors and transmits the status of its own front door ajar switch.
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Heated Mirrors - Each door module provides control for its own optional heated outside rear view mirror.
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Illuminated Entry - Each door module supports an illuminated entry feature through its own optional front door-mounted courtesy lamp.
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Memory Mirrors - Each door module provides control for its own optional memory outside rear view mirror.
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Memory Switch - The DDM monitors the status of the optional memory switch and controls the illumination of the memory switch set" Light
Emitting Diode (LED) indicator and illumination lamps.
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Memory System - The DDM transmits memory set and recall messages based upon inputs from the memory switch. If the optional RKE linked to
memory feature is enabled, the DDM will also transmit memory recall messages based upon memory requests received from the Remote Keyless
Entry (RKE) system in the PDM. Certain memory system features are programmable.
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Power foldaway Mirrors - Export Only - Each door module provides support for the optional power foldaway outside mirrors. The DDM also
houses the control switch for this system.
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Power Lock Control - The DDM provides control for the driver side front door power lock motor, while the PDM provides control for the power
lock motors of the three remaining doors and the liftgate.
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Power Lock Switch Status - Each door module monitors and transmits the status of its own integral power lock switch.
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Power Window Control - Each door module provides control for both the front and rear door power window motors and the rear door power
window switches on the same side of the vehicle.
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Power Window Switch Status - The DDM monitors and transmits the status of its integral passenger side front and rear power window switches.
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Remote Keyless Entry - The PDM monitors and transmits the status of the Remote Keyless Entry (RKE) system and provides support for the RKE
Lock (with the optional horn chirp and park lamp flash features), Unlock with the optional RKE unlock, and Panic Mode functions. The optional
RKE features are programmable.
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Switch Illumination - Each door module provides control of the power window and power lock switch illumination for the front and rear doors on
the same side of the vehicle. The DDM provides control of the power mirror switch illumination.
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Window Lockout - The DDM monitors and transmits the status of its integral window lockout switch to provide the power window lockout feature
and coordinate power window switch knob illumination.
The door modules are serviced only as complete units. Many of the features in the vehicle controlled or supported by the door modules are
programmable using either the Electronic Vehicle Information Center (EVIC) user interface, or the DRBIII scan tool. If a door module is damaged or
faulty, the entire door module unit must be replaced.
OPERATION
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.
