Power Window Control Module: Description and Operation

DESCRIPTION

A door module is concealed behind the trim panel of each front door (Door Module). The only visible components of the door modules are the integral power window and power lock switches. The switches and their respective switch bezels are located forward of the door pull cup found in the arm rest of each front door trim panel. 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 optional power foldaway mirror switch used in vehicles sold in some markets. Each door module is secured to the back of the trim panel with five screws. The circuitry of each door module is enclosed within a molded plastic housing with two integral external connector receptacles that connect the modules to the vehicle electrical system through two take outs with connectors from the door wire harnesses. The DDM has a third connector receptacle that accepts the pigtail wire connector of the memory switch on models equipped with the optional memory system.

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. In response to all of those inputs, the internal circuitry and programming of the DDM and PDM allow them to control and integrate many electronic functions and features of the vehicle through both hard wired outputs and the transmission of electronic message outputs to other electronic modules in the vehicle over the PCI data bus. The electronic functions and features that the door modules support or control include the following:

^ Automatic Door Lock - The two door modules work in concert to provide an automatic door lock feature (also known as rolling door locks) which locks the doors when the vehicle is moving. This is a programmable feature.
^ Automatic Door Unlock On Exit - The two door modules work in concert to provide an automatic door unlock on exit feature which 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.
^ Customer Programmable Features - Each door module provides support for certain customer programmable features.
^ Cylinder Lock Switch Status - The DDM monitors and transmits the status of the cylinder lock switch on the driver side front door lock cylinder.
^ Door Courtesy Lamp Control - Each door module provides control of its own optional front door-mounted courtesy lamp.
^ 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.
^ Express-Down Window - The DDM provides an express-down feature (also known as auto-down or one-touch down) for the driver side front door window only.
^ Extended Window Operation - Both door modules provide an extended power window operation feature that allows operation of the power windows for a timed interval following ignition Off.
^ Front Door Ajar Switch Status - Each door module monitors and transmits the status of its own front door ajar switch.
^ Heated Mirrors - Each door module provides support and control for its own optional heated outside rear view mirror.
^ Illuminated Entry - Each door module supports an illuminated entry feature through its own optional front door-mounted courtesy lamp.
^ Memory Mirrors - Each door module provides support and control for its own optional memory outside rear view mirror.
^ Memory Switch - The DDM monitors the status of the optional memory switch and controls the illumination of the memory switch Light Emitting Diode (LED) indicator and illumination lamps.
^ 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.
^ Power Foldaway Mirrors - Each door module provides support for the optional power foldaway outside mirrors used for vehicles sold in some markets. The DDM also houses the control switch for this system.
^ 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.
^ Power Lock Switch Status - Each door module monitors and transmits the status of its own integral power lock switch.
^ 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.
^ Power Window Switch Status - The DDM monitors and transmits the status of its integral passenger side front and rear power window switches.
^ 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 sequence feature of one press driver door/two press all doors, or one press all doors, and the optional RKE unlock link to memory recall request feature), and Panic Mode functions. The optional RKE features are programmable.
^ 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 and window lockout switch illumination.
^ 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.

Hard wired circuitry connects the door modules to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the BCM through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The door modules are serviced only as complete units. Many of the electronic 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 Driver Door Module (DDM) and Passenger Door Module (PDM) are designed to control and integrate many of the electronic features and functions of the vehicle. 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. The DDM or PDM programming then performs those tasks and provides those features through both PCI data bus communication with other electronic modules and through hard wired outputs.

The DDM and PDM circuitry operates on battery current received through a fuse in the Power Distribution Center (PDC) on a non-switched fused B(+) circuit so that these modules can operate regardless of the ignition switch position. The DDM and PDM circuitry is grounded through a single wire take out with an eyelet terminal connector of the body wire harness that is secured under a ground screw located on the back of the front seat crossmember beneath the right front seat.

The DDM and PDM can be diagnosed using a DRBIII scan tool. Refer to the appropriate diagnostic information.

HARD WIRED INPUTS

The hard wired inputs to the door modules include the following:

^ Door ajar switch sense
^ Driver door key cylinder switch sense (DDM)
^ FusedB(+)
^ Ground
^ Memory switch mux (DDM)
^ Mirror horizontal position signal
^ Mirror vertical position signal
^ PCIbus

HARD WIRED OUTPUTS

The hard wired outputs of the door modules include the following:

^ Courtesy lamp driver
^ Courtesy lamp ground
^ Diagnostic out (DDM)
^ Door/liftgate lock driver Door/liftgate unlock driver
^ Door switch illumination (rear power window)
^ Front window driver (down)
^ Front window driver (up)
^ Memory set indicator driver (DDM)
^ Memory switch return (DDM)
^ Mirror common driver
^ Mirror heater ground
^ Mirror heater 12V supply
^ Rear window driver (down)
^ Rear window driver (up)
^ Mirror horizontal driver
^ Mirror sensor ground
^ Mirror vertical driver
^ PCIbus
^ Switch illumination driver (memory - DDM)

MESSAGING

The door modules use the following messages received from other electronic modules over the PCI data bus:

^ Accessory Delay Control (BCM)
^ Courtesy Lamp Status (BCM)
^ Door Ajar Status/Rear Doors (BCM)
^ Door Lock Status (DDM/PDM)
^ Ignition Switch Position (BCM)
^ Key-In Ignition Status (BCM)
^ Programmable Features Preferences/Auto Lock/Auto Unlock/RKE Unlock Sequence/RKE Link to Memory (EVIC)
^ Memory Recall (DDM)
^ Rear Window Defogger Relay Status (BCM)
^ Vehicle Speed (PCM)

The door modules provide the following messages to other electronic modules over the PCI data bus:

^ Cylinder Lock Switch Status (BCM)
^ Door Ajar Status/Front Doors (BCM/DDM/PDM)
^ Door Lock Status (DDM/PDM)
^ Memory Recall (PDM/MHSM/MSM/Radio)
^ Memory Set Switch Status (PDM/MHSM/MSM/Radio)
^ Panic Control (BCM)
^ Power Window Switch Status (PDM)
^ RKE Status (BCM/DDM) Window Lockout Switch Status (PDM)