Principles of Operation

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The driver door module (DDM) is on the controller area network (CAN) communication network. In order to support several vehicle subsystems, the module supports communications between various modules and also supports scan tool communications.

The DDM controls the driver memory power exterior mirror. This feature allows the driver to program personalized mirror positions. Once the driver stores a mirror position, the driver can recall the setting by pressing the corresponding memory switch or by using a programmed remote keyless entry (RKE) transmitter. Refer to REAR VIEW MIRRORS article. The DDM also controls the lock/unlock functions of the driver door lock actuator and receives lock/unlock input information from the door lock key cylinder switch and reset information from the driver door lock actuator on vehicles with memory.