The mirror select switch on the LH front power window switch is placed in L or R to indicate the mirror to be moved. The LH front power window switch receives the active high input from the mirror select switch and also receives an active high input from the mirror switch when the switch is actuated. The four mirror switch contacts are in the corners of the switch. The contacts are left-up, left-down, right-up, and right-down. When the mirror switch is actuated in a direct up, down, left, or right direction, the switch hit two of the contacts. The LH front power window switch recognizes the two contact input as a one direction input in the direction common to the two inputs. The LH front power window switch then sends a message on the Simple Bus Interface (SBI) to the driver door module or the passenger door module depending on the position of the mirror select switch indicating that the mirror switch need to be moved. Each mirror has two reversible motors that the door modules control by supplying Battery Positive Voltage (B+) and ground to these motors.

The vehicle may be equipped with the "personalization package" containing memory seats and memory mirrors. The memory mirrors are also controlled by the LH front power window switch, driver door module, and the passenger door module. The mirrors are equipped with potentiometer circuits that provide constant information to the passenger door module and the driver door module on the location of the mirrors on their horizontal and vertical axis. This information is in the form of feedback voltage received from their potentiometers.

When a mirror location is programmed into the personalization package, the driver door module and passenger door module store the location information and assign it to the personalization code. When that personalization code is received the modules check the current position of the mirrors and move them to the correct position. The modules move the mirrors until the feedback voltage from the mirrors match the voltage levels stored as correct for that personalization code.

The automatic day-night mirrors are equipped with an electrochromic (EC) film that darkens when a low voltage is applied. The EC function is controlled by the interior rear view mirror.

The interior rear view mirror contains the photo cells that detect the ambient light level and compares it to the light entering the vehicle from the rear. When the level from the rear exceeds the ambient level, the EC system darkens the interior mirror and sends a low voltage to the driver side outside rear view mirror.

The EC circuit passes through the driver door module, but the driver door module does not affect this circuit.

The driver door module communicates with the powertrain control module (PCM) over the class 2 data link. When the gear selector is shifted to reverse. The PCM will transmit a class 2 message to the driver door module. The driver door module will send this message on to the passenger door module over the simple bus interface (SBI). the passenger door module will tilt the RH outside rear view mirror down 7 degrees. This allows the driver to see the curb while parallel parking.

The mirrors heat during the defrost/defog cycles for the rear window. The heated mirrors are connected to the driver door module and the passenger door module. The driver door module receives a class 2 message from the DIM commanding the heated mirrors ON. The driver door module sends a SBI message to the passenger door module to command the passenger side mirror heater ON. The driver door module supplies the voltage and current to the heater element in the driver outside mirror. The passenger door module supplies the voltage and current to the heater element in the passenger outside mirror.