The power outside mirror system consists of the following components:

In order to control outside rear view mirror adjustments, two switches are contained within the driver door switch assembly (DDSA). The DDSA contains a built in mirror select switch and a built in mirror position switch. For export vehicles, the DDSA also contains a built in express folding mirror switch. The DDSA reports the activity of these switches to the driver door module (DDM).

The mirror select switch is used to select which mirror, left or right, is to be moved.

The mirror position switch is used to move the mirror that has been selected for adjustment to the desired position. Four mirror switch contacts are located in the corners of the mirror position switch. The contacts are left-up, left-down, right-up, and right-down. When the mirror position switch is activated in a direct up, down, left, or right direction, the switch hits two of the contacts. The DDSA recognizes the two contact input as a one direction input in the direction common to the two inputs and sends this data on to the DDM. Depending on which mirror has been selected for adjustment, the DDM either moves the driver door mirror to the requested position, or sends a power door serial data message to the passenger door module (PDM) indicating that the passenger door mirror needs to be moved. The PDM then moves the passenger door mirror to the requested position.

The express folding mirror switch is used to move the mirrors to the fully folded position, or the fully extended position.

Each mirror has two reversible motors for position adjustment, and, for export vehicles, a third reversible motor for power folding functions. The door modules control the reversible motors by supplying Battery Positive Voltage (B+) and ground to these motors.

For a LH mirror left movement, the driver door module supplies battery positive voltage (B+) via the left mirror motor left circuit, and ground via the left mirror motor right circuit to the LH mirror horizontal motor. For a LH mirror right movement, the driver door module reverses the polarity and supplies battery positive voltage (B+) via the left mirror motor right circuit, and ground via the left mirror motor left circuit to the LH mirror horizontal motor. For a LH mirror up movement, the driver door module supplies battery positive voltage (B+) via the left mirror motor up circuit, and ground via the left mirror motor down circuit to the LH mirror vertical motor. For a LH mirror down movement, the driver door module reverses the polarity and supplies battery positive voltage (B+) via the left mirror motor down circuit, and ground via the left mirror motor up circuit to the LH mirror vertical motor.

For a RH mirror left movement, the passenger door module supplies battery positive voltage (B+) via the right mirror motor left circuit, and ground via the right mirror motor right circuit to the RH mirror horizontal motor. For a RH mirror right movement, the passenger door module reverses the polarity and supplies battery positive voltage (B+) via the right mirror motor right circuit, and ground via the right mirror motor left circuit. For a RH mirror up movement, the passenger door module supplies battery positive voltage (B+) via the right mirror motor up circuit, and ground via the right mirror motor down circuit to the RH mirror vertical motor. For a RH mirror down movement, the passenger door module reverses the polarity and supplies battery positive voltage (B+) via the right mirror motor down circuit and ground via the right mirror motor up circuit.

The vehicle may be equipped with the "personalization package" containing memory seats and memory mirrors. However, the front door modules cannot perform memory mirror functions unless the Personalization Option is activated. The Dash Integration Module (DIM) stores the vehicles Personalization Option setting provided at the assembly plant. The DIM reports this Personalization Option setting to both front door modules, as well as other receiving modules, each time the ignition switch is cycled to RUN. The front door modules then store the Personalization Option setting and examine it before making a memory mirrors adjustment.

The Personalization Option setting stored within the front door modules will not change until the Personalization Option setting within the DIM is changed and the ignition switch then cycled to RUN.

If the Personalization Option is activated on a vehicle that is not equipped with A45, the door modules will erroneously set DTCs B1581, B1591, B1611, and B1621.

The memory mirrors are controlled by the driver door switch assembly (DDSA), the driver door module (DDM), and the front passenger door module (PDM). The DDSA is used to decode memory switch activations and the door modules are used to store mirror position information and move the mirrors.

When a mirror position is programmed into the personalization package, the door modules store the position information and assign it to the personalization code. During a memory recall, that personalization code is retrieved by the modules. The modules then check the current position of the mirrors and move them to the correct position.

Each mirror is equipped with two potentiometer type position sensors and circuits that provide constant information, in the form of feedback voltage, to each door module indicating the position of the mirrors on their horizontal and vertical axis. The mirror position sensors are attached to each mirror motor's transmission cable. When the cable rotates, the resistance of the sensors vary and the feedback voltage is monitored by the appropriate door module to determine the motor's position. The sensor feedback voltage varies from 0.25 volts to 4.75 volts. Each door module also supplies reference voltage through a 5 volt reference circuit, and ground through a memory seat/mirror sensor low reference circuit to their respective mirror position sensors.The driver door module receives feedback voltage from the LH mirror horizontal position sensor through the left mirror horizontal position sensor signal circuit and feedback voltage from the LH mirror vertical position sensor through the left mirror vertical position sensor signal circuit. The passenger door module receives feedback voltage from the RH mirror horizontal position sensor through the right mirror horizontal position sensor signal circuit and feedback voltage from the RH mirror vertical position sensor through the right mirror vertical position sensor signal circuit. When a memory set command is received, each door module records the mirror motor positions by storing the feedback voltage of the respective position sensors. When a memory recall command is recieved, each door module moves the appropriate mirror motors until the position sensor feedback voltages equal the feedback voltages stored in memory.

If the vehicle is equipped with memory mirrors, it is equipped with the parallel parking mode feature. For this feature, 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 transmits this status via a class 2 message to the driver door module. The driver door module sends this message on to the passenger door module over the power door serial data circuit. The passenger door module (PDM) then tilts 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. When the defrost/defog is turned on, the driver door module receives a class 2 message from the dash integration module (DIM) commanding the heated mirrors ON. The driver door module then commands the driver side mirror heater ON, and sends a power door serial data message to the passenger door module to command the passenger side mirror heater ON.

The driver door module supplies battery positive voltage to the LH outside rearview mirror heating element via the feed circuit, and ground via the return circuit.

The passenger door module supplies battery positive voltage to the RH outside rearview mirror heating element via the feed circuit, and ground via the return circuit.

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 Inside Rearview Mirror Description and Operation in Stationary Windows for further description and operation of the inside rearview mirror.

The express folding mirrors feature is controlled by the express folding mirror switch that is built into the driver door switch assembly (DDSA), and the door modules. When the express folding mirror switch is activated, its signal is received as an active high input by the DDSA. The DDSA then sends a message on the power door serial data line to the driver door module (DDM) indicating that the switch has been activated. The DDM sends the message on to the passenger door module (PDM). If the express folding mirror switch is activated when the mirrors are currently folded, the modules will move the mirrors to the full extended position. If the express folding mirror switch is activated when the mirrors are currently extended, the modules will move the mirrors to the full fold position.

Each mirror has a reversible motor that the door modules control by supplying battery positive voltage (B+) and ground to the motor. For a mirror extend, the door module supplies battery positive voltage (B+) via the folding mirror motor extend circuit, and ground via the folding mirror motor retract circuit to the mirror power fold motor until the mirror fully extends. For a mirror retract, the door module reverses the polarity and supplies battery positive voltage (B+) via the folding mirror motor retract circuit and ground via the folding mirror motor extend circuit to the fold motor until the mirror fully retracts.