The power mirrors are controlled by the DDS, the DDM and the PDM. The DDS decodes mirror control switch activations and the door modules apply voltage and ground to the respective mirror motors to move the mirrors to the desired positions.

The DDS contains 2 built-in switches, the mirror select switch and the mirror position switch. The mirror select switch is used to select the mirror to be adjusted. The mirror position switch is used to move the mirror to the desired position. The mirror select switch and mirror position switch receive voltage and ground from the DDS. The DDS reports the activity of these 2 switches to the DDM and the PDM via the class 2 serial data circuit.

Each mirror has 2 reversible mirror motors for position adjustment. These are the vertical motor and the horizontal motor. Each mirror motor is wired to the associated door module through 2 motor control circuits. The door modules control the reversible motors by applying battery voltage and ground to the appropriate motor control circuits. The door module reverses the polarity of the voltage and ground it applies to the motor control circuits in order to move the motor in an opposite direction.

The memory mirrors are controlled by the mirror position sensors, the DDS, the DDM and the PDM. The DDS is used in decoding memory switch activations and the mirror position sensors provide the door modules with mirror position information. The door modules store the mirror position information and supply the voltage and ground necessary to run the mirror motors.

For memory mirror operations, each outside rearview mirror has 4 additional circuits and contains a vertical position sensor and a horizontal position sensor. The position sensors are attached to the corresponding position motor and are an integral part of each mirror motor. The position sensors, which are potentiometer type sensors, provide constant information, in the form of feedback voltage, to the associated door module, indicating the vertical and horizontal position of the mirror. Each door module supplies 5-volt reference voltage, through a 5-volt reference circuit, and ground through a mirror sensor low reference circuit, to the position sensors.

This feature allows the operator to simultaneously retract both mirrors to a fully folded position. The DDS has an additional power folding mirrors switch built in and, each mirror contains an additional power folding mirror motor. When the switch is activated to fold the mirrors, the DDS interprets the signal input and sends the command to the DDM and the PDM. The DDM and the PDM then each apply battery voltage and ground to the appropriate circuits of their respective power folding motors in order to retract both mirrors. When the switch is activated to unfold the mirrors, the door modules reverse the polarity of the voltage and ground applied to the motors in order to move both mirrors to the fully extended position.

The mirrors heat during the defrost/defog cycles for the rear window. The heated mirrors are wired to the DDM and the PDM. The DDM and the PDM receive a class 2 message from the instrument panel cluster (IPC) via the rear integration module (RIM) commanding the heated mirrors ON. The DDM and PDM first examine information from the dash integration module (DIM) to determine if vehicle conditions are correct for the heated mirrors function to be permitted. If conditions are correct, the DDM then applies battery voltage and ground to the driver side mirror heater element, and the PDM applies battery voltage and ground to the passenger side mirror heater element.

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.