Grand Cherokee 2WD Limited V8-4.7L (2002)
Door Module: Description and Operation
Fig.7 Door Module
DOOR MODULE
A multiplexed door module is concealed 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, the power mirror switch, and the power foldaway mirror switch
for export vehicles.
The door modules control the following features: power door locks, automatic (rolling) door locks, driver window express down, memory recall
functions (adjustable pedals, memory seats and mirrors), remote keyless entry, power mirrors, heated mirrors, door key cylinder disarm (driver
door only), door lock inhibit and auto unlock on exit. Reduced wiring complexity is a key advantage of using multiplexed door modules. These
modules are addressable with the DRB III from the "Body" menu to facilitate faster and easier diagnosis.
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 after 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.
