Component Description: DDM

For the power mirror function, the DDM receives mirror movement requests through the LIN circuit from the master window control switch. When the LH exterior mirror is selected, the DDM provides voltage and ground to the appropriate LH exterior mirror motor to drive the mirror glass in the desired direction.

If the vehicle is equipped with heated exterior mirrors, the DDM supplies voltage to the LH exterior mirror glass heating element based on messages received the BCM.

If the vehicle is equipped with memory mirrors the DDM monitors the potentiometers in the LH exterior mirror to determine the position of the exterior mirror glass. Preset memory positions for the LH exterior mirror glass are stored in the DDM

When a concern exists, the DDM is capable of setting and storing Diagnostic Trouble Codes (DTCs) for the LH exterior mirror motor drive circuits, position sensor circuits (if equipped) and mirror heater circuit (if equipped).