The LH mirror switch circuit provides input to the LH Door Control Module (LDCM) when the LH mirror switch is pressed. This input allows the LDCM to detect a mirror UP, DOWN, LEFT or RIGHT request from the LH mirror switch. The LDCM provides both power and ground to the mirror switches. When the LH mirror UP or DOWN switch is pressed, a ground is supplied through the LH mirror up or down switch to the LDCM mirror up or down input which is pulled low. When the LDCM detects low voltage on the LH mirror up or down input, the LDCM will command the mirror verticality. If the LDCM detects low voltage on the LH mirror left or right input, the LDCM will command the LH mirror horizontally. If the RH mirror is selected, the LDCM will send a message on the serial data line to the RH Door Control Module (RDCM) to operate the RH mirror in the direction selected by the LH 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 DCMs control the heated mirror functions. The LDCM supplies power and ground to the LH heated mirror and the RDCM supplies it to the RH heated mirror. When the DCMs receive a message on the serial data line indicating the rear defogger was turned ON, both DCMs will activate the heated mirror by applying voltage to CKT 267.

The DCMs can recall mirror positions. The Door Control Modules (DCMs) receive a mirror horizontal and vertical position signal from the mirror horizontal and vertical position sensors. This signal is used by the DCMs for memory recall functions to determine the horizontal and vertical position of the LH and RH mirror. The DCMs command the mirror memory settings based upon the voltage level the DCMs receives back from the horizontal and vertical position sensors. The DCMs provides a 5 volt supply, a ground to the horizontal and vertical position sensors. The horizontal and horizontal position sensors is a variable resistor which the DCMs monitor the voltage level across through a signal circuit. When the memory 1 or memory 2 switch is pressed, a ground is supplied through the memory 1 or memory 2 switch circuit to the LDCM memory 1 or memory 2 input which is pulled low. When the LDCM detects low voltage on a memory input, the LDCM will activate the appropriate memory functions and also send a message on the serial data line to other systems responsible for memory recall functions (RDCM, radio, seats, etc.). When the LH Door Control Module (LDCM) sends a memory recall message on the serial data line, the RDCM will command the RH mirror motor in the appropriate direction until the position sensor voltage level is achieved.