Outside Mirror Description and Operation Power Mirrors

Power Mirror System Components

The power mirror system consists of the following components:

Each of the outside power mirrors contains 2 reversible motors to provide horizontal and vertical movement of the mirror glass. The vertical motor operates the up and down directions and the horizontal motor operates the left and right directions. If equipped with power folding mirrors, each outside power mirror will contain a reversible fold motor to operate the extend and retract functions. Each of the mirror motors are circuit breaker protected.

Power Mirror System Controls

The power mirror switch incorporates a 3 position mirror select switch and a 4 position mirror direction switch. The mirror select switch allows the operator to select the mirror to be moved by rotating counterclockwise to the L position for the left power mirror, rotating clockwise to the R position for the right power mirror or the center which is the neutral/fold position. The mirror direction switch is a 4 position switch that allows the operator to move the selected mirror up, down, left or right. The mirror direction switch also functions as the folding mirror switch. When the selector switch is in the neutral/fold position, activate the mirror direction switch to the left to extend the mirrors and right to retract the mirrors.

Power Mirror System Operation

The power mirror switch receives power from the DDM through the battery supply voltage circuit and the DDM fuse. The left and right mirror positions of the select switch and four positions of the direction switch, when active, will provide a battery voltage signal to the DDM through their respective signal circuits. If the selector switch is placed in the L position and the up switch is depressed, a battery voltage signal will be supplied to the DDM through the driver mirror select switch signal and the mirror motor up switch signal circuits. The DDM upon receipt of these signals will provide battery voltage to the mirror motor left/up control circuit and ground to the mirror motor down control circuit and the mirror will move up. The remainder of the driver mirror functions operate in the same manner as described above except the DDM will supply battery voltage and ground to the appropriate control circuits for the direction selected. If the passenger mirror is selected and a direction switch is activated, the DDM sends a class 2 message to the PDM indicating that the passenger mirror was selected and the direction to be commanded. The PDM will then supply battery voltage and ground to the appropriate control circuits for the direction selected.

Memory Mirror System Controls

The DDM and PDM are capable of storing mirror positions and controlling the mirrors to these positions to the preferred settings of 2 different drivers. Each driver will be able to personalize the memory system by positioning the mirrors and seats to their preferred settings. Then press and hold the memory 1 or memory 2 button until an audible chime is heard and the current mirror positions will be stored into memory of the DDM and PDM. Seat position will be stored in the Memory Seat Module (MSM). Once the mirror and seat positions have been stored into memory, a momentary memory 1 or memory 2 switch activation will supply the DDM a battery voltage signal. The DDM, upon receipt of the memory switch signal, with the transmission in park or neutral, will then drive the driver mirror to the corresponding stored memory position. The DDM will also send a class 2 message to the PDM and MSM indicating that a memory switch activation occurred. The PDM will then drive the passenger mirror and the MSM will drive the driver seat to the corresponding stored memory position. The memory system can also be controlled by any of the following, if programmed, using the Driver Information Center (DIC) to enable/disable the features:

For further information on programming and configuration, refer to Driver Personalization in Personalization.

Memory Mirror System Operation

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The DDM and PDM supplies a reference voltage and a low reference to these sensors and determines mirror position through the horizontal and vertical position signal circuits.

The memory switch receives power from the DDM through the battery supply voltage circuit and the DDM fuse. The DDM upon receipt of a memory switch signal input or an appropriate class 2 message from the BCM, the DDM and PDM will then supply battery voltage and ground to the appropriate power mirror motors through the mirror motor control circuits to move the mirrors to the predetermined positions.

Mirror Tilt in Reverse Controls

This feature is capable of tilting the left, right or both power mirrors when the transmission is placed in reverse to provide enhanced visibility during parking or backing maneuvers and is programmable through the Driver Information Center. This feature can be personalized to the needs of 2 different drivers. For further information, refer to Driver Personalization in Personalization.

Mirror Tilt in Reverse Operation

When the vehicle is placed in reverse and the appropriate class 2 message from the BCM and PCM is received by the DDM and PDM, the DDM and PDM will then supply battery voltage to the appropriate power mirror motors through the mirror motor control circuits to move the mirrors to the predetermined positions. The positions that are stored can be altered by starting the engine, applying the brake, placing the vehicle in reverse and controlling both the left and right mirrors to the desired positions and shifting the vehicle out of reverse. These new positions will be stored for the last memory recall that happened.

Folding Mirror System Controls

When the mirror select switch is in the neutral/fold position allows the operator to retract or extend the outside rearview mirrors from a single switch. The mirror fold switch incorporates solid state circuitry to allow this single switch input to alternately perform both extend and retract functions.

Folding Mirror System Operation

The mirror fold switch receives power through the battery supply voltage circuit and the EXT LPS fuse and a constant ground. The mirror extend and retract control circuits are connected to ground through the normally closed contacts of the mirror fold switch. When the mirror fold switch is activated, the solid state circuitry will energize either the extend or retract relay (depending on the last function) which supplies battery voltage to the fold motor through one of the control circuits. The other control circuit is connected to ground through the normally closed contacts in the mirror fold switch and the mirror extends or retracts.

Outside Mirror Description and Operation Heated Mirrors

On vehicles equipped with heated outside rearview mirrors (OSRV), the driver door module (DDM) and passenger door module (PDM) controls the activation of the mirror heaters. Upon receiving a Class 2 message indicating a request for heated mirrors, the DDM (and PDM for the passenger side) will activate the mirror heater output. The mirror heaters will remain active until a new message is received indicating rear defogger is to be deactivated (either by driver input or by expiration of a calibrated timer).

Outside Mirror Description and Operation Automatic Day - Night Mirrors

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.