Module, Door (DDM/PDM): Operation

The front Door Control Modules (DCM) contain logic circuits that monitor various hardwired low current, multiplexed inputs from the power window, power lock, power mirror and memory switches on their respective door. They also receive Controller Area Network - Interior High Speed (CAN-IHS) data bus electronic message-based external inputs from the opposing DCM as well as from other electronic modules in the vehicle. The front DCMs also monitor hardwired power window motor Hall effect sensors and memory mirror position sensor inputs.

In addition, the Driver Door Module (DDM) receives electronic message inputs from the driver side front door switch module over the Local Interface Network (LIN) data bus network. The program logic within the front DDM allows the microcontroller to prioritize all of these inputs and determine the tasks it needs to perform. These tasks are then completed either by controlling hardwired outputs to the various motors, actuators or lamps on its own or the rear doors, or by sending electronic message requests over the CAN-IHS bus to the appropriate electronic module in the vehicle.

The DCMs 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 DDM and Passenger Door Module (PDM) 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 hardwired circuits between components related to the electronic front DCMs may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair Refer to STANDARD PROCEDURE , For connector repair procedures, refer to REMOVAL , and Refer to INSTALLATION .

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the front door control modules or the electronic controls and communication between modules and other devices that provide some features of the door modules. The most reliable, efficient, and accurate means to diagnose the front door control modules or the electronic controls and communication related to module operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.