Door Module - Operation

OPERATION

The microprocessor-based electronic door control modules (also known as a Driver Door Module/DDM, a Passenger Door Module/PDM, Door Multiplex/MUX Modules or Window Control Modules) contain logic circuits that monitor various hard wired low current, multiplexed inputs from the express up or down (also known as one-touch or auto-up and down) power window switches and motors on their respective door. They also receive Controller Area Network (CAN) data bus electronic message-based external inputs from the opposing front door control module as well as from other electronic modules in the vehicle. The door control modules also monitor hard wired power window motor Hall effect sensor inputs.

The door control modules are powered by a fused B(+) circuit and are grounded at all times so that they can operate regardless of the ignition switch position. The modules are wired to an accessory delay relay, which allows the operation of the windows and for a timed interval after the ignition is turned OFF, provided that the doors are not opened. Both driver and passenger door control modules provide active and stored Diagnostic Trouble Codes (DTC) through On-Board Diagnostics (OBD) and communicate with a diagnostic scan tool using the CAN data bus.

An Anti-Pinch function is a safety feature that senses obstacles at the top of the glass and anywhere on the weather seal where it meets the glass during the window closing operation. When a window switch is pressed to the AUTO position and the closing window traps an object a sense current will surpass its limit, then the module will reverse the power window motor and drive the window down approximately 200 millimeters. The pinch force limit is speed dependent, which means that if the vehicle is going over 2 kilometers per hour the pinch force will be higher than if the vehicle is stationary.

If a power window switch is held in the AUTO position and the closing window traps an object, the module will stop the power window motor and, after the switch is released, will drive the window in the opposite direction approximately 10 millimeters. If the switch is again held in the AUTO position within 8 seconds after the switch was released, the module will enter a Panic mode. During the Panic mode, the module will drive the motor with full (stall) force, then stop.

The hard wired inputs and outputs of the door control module may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls and communication between modules and other devices that provide some features of the power window system features the door control modules provide. The most reliable, efficient and accurate means to diagnose the door control modules or the electronic controls and communication related to operation of these systems requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.