Door Module - Operation

OPERATION

The microprocessor-based electronic front door control modules contain logic circuits that monitor various hard wired low current, multiplexed and Local Interface Network (LIN) data bus electronic message-based external inputs from the power window, power lock, power mirror and memory switches on their respective doors as well as from the opposing front door control module. The front door control modules also monitor hard wired power window motor Hall effect sensors and memory mirror position sensor inputs.

In addition, the front door control module on the driver front door receives electronic message inputs from and shares its resources through electronic message outputs to other electronic control modules in the vehicle over the Controller Area Network (CAN) Interior High Speed (IHS) data bus network. The program logic within the front door control module allows the microprocessor to prioritize all of these inputs and determine the tasks it needs to perform. These tasks are then completed either by controlling hard wired outputs to the various motor, actuators, lamps or displays contained on its own door or by sending electronic message requests over the LIN or CAN-IHS bus to the appropriate electronic module in the vehicle.

The front 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. 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.

The hard wired inputs and outputs of the front 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, power lock, memory, interior lighting or exterior lighting system features the front door control modules provide. The most reliable, efficient and accurate means to diagnose the front 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.