The driver mirror motor left/down control circuit provides an input to the driver door module (DDM) when the LH mirror select switch is activated. This input allows the DDM to detect a mirror up switch, mirror down switch, mirror left switch or mirror right switch request from the driver door switch. The DDM provides both power and ground to the mirror switches. When the mirror up or down switch is activated, a ground is supplied through the mirror up or down switch to the DDM mirror up or down input which is pulled low. When the DDM detects low voltage on the left mirror switch up or down signal input, the DDM will command the mirror verticality. If the DDM detects low voltage on the left mirror switch left or right input, the DDM will command the mirror horizontally. If the RH mirror is selected, the DDM will send a message on the serial data line to the passenger door module (PDM) to operate the RH mirror in the direction selected by the RH mirror switch. The DCMs provide both power and ground for mirror output control through the vertical and horizontal mirror motor control circuits. The direction of the mirror motor is determined by the polarity of the voltage applied to the mirror motor.

The driver door module (DDM) and passenger door module (PDM) control the heated mirror functions. The DDM supplies power and ground to the driver heated mirror and the PDM supplies it to the passenger heated mirror. When the door modules receive a message on the serial data line indicating the rear defogger was turned ON, both door modules will activate the heated mirror by applying voltage to the heated mirror element feed circuit.

The driver door module (DDM) and passenger door module (PDM) can recall mirror positions. The door modules receive mirror position signals from the mirror horizontal and vertical position sensors. These signals are used by the door modules during memory recall to determine the horizontal and vertical positions of the driver and passenger mirrors. The door modules command the memory mirror settings based on the voltage level received from the horizontal and vertical position sensors. The door modules provides a 5 volt supply and ground to the sensors. The vertical and horizontal position sensors are variable resistors which monitor the voltage level across a signal circuit. When either of the memory switches is pressed, a ground is supplied through the DDM, pulling the memory switch low. When the DDM detects low voltage on a memory input, it will activate the appropriate memory function, which also sends messages on the serial data line to other systems responsible for memory recall functions. When the DDM sends a memory recall message on the serial data line, the PDM will command the passenger mirror to the appropriate position.

For information on programming the memory mirrors refer to Driver Personalization in Personalization.

The automatic day/night feature of the driver outside rearview mirror is controlled by the inside rearview mirror. The inside rearview mirror supplies a signal and a low reference to the driver outside rearview mirror. The voltage on the signal circuit of the driver outside rearview mirror varies between 0.5 to 1.5 volts depending on light conditions present at the inside rearview mirror. At night, with the automatic day-night feature enabled, the driver outside rearview mirror will automatically darken with the inside rearview mirror to reduce the glare from the headlamps from behind. The voltage on the signal circuit of the driver outside rearview mirror will be near 1.5 volts. In the daytime, the mirrors are in a normal state. The voltage on the signal circuit of the driver outside rearview mirror may be less than or near 0.5 volts. Refer to Automatic Day-Night Mirror Description and Operation in Stationary Windows for further description and operation of the inside rearview mirror.