Principles of Operation

PRINCIPLES OF OPERATION

Exterior Mirrors
The power exterior mirror function allows either the driver or passenger exterior mirror to be positioned through the use of the exterior mirror control switch. Moving the switch to the driver side selects the driver mirror, while moving the switch to the passenger side selects the passenger mirror. Positioning of the exterior mirror glass is accomplished by actuating either the UP, DOWN, LEFT or RIGHT mirror switches. Each mirror is equipped with a motor to control motion in the vertical axis (UP/DOWN motion) and a motor to control motion in the horizontal axis (LEFT/RIGHT motion). Motion continues until a motor stall is detected (due to end of travel), a physical stop is reached, or the switch is released. Voltage is supplied to the exterior mirror control switch on circuit 543 (DG), and ground on circuit 57 (BK). The exterior mirror control switch routes current to the exterior mirror motors on circuits correlated with the desired direction of movement. Current flow to the exterior mirror motors is reversed when the opposite direction is selected on the exterior mirror control switch.

The heated exterior mirror system (if equipped) removes frost, snow, ice or condensation from the exterior mirrors. The heated exterior mirror system heats the exterior mirror glass for up to 10 minutes through the rear defrost switch upon request when the ignition is in the RUN position. Voltage is supplied to the heated exterior mirrors on circuit 59 (DG/VT) from the smart junction box (SJB) heated rear window relay. A ground is provided on circuit 57 (BK). The system stops heating the mirror glass upon request through the heated rear window switch or after 10 minutes has elapsed since heating the mirror glass was initiated or when the ignition switch is turned to OFF or ACC position. When the heated exterior mirror system is active and the ignition switch is turned to START, the mirrors are momentarily deactivated as long as the ignition is in START and is reactivated when the ignition switch returns to RUN. The 10 minute time continues while the ignition switch is in START. The heated rear window indicator is illuminated whenever the heated rear window and exterior mirrors are being heated.

Interior Mirror
The automatic dimming feature darkens the interior rear view mirror whenever the front ambient light sensor detects low outside light and glare reaches the light sensor (photo cell) located inside the mirror. The interior rear view mirror starts to return to the normal view once the glare goes away. Voltage is supplied to the automatic dimming mirror from the SJB fuse 22 (15A) on circuit 297 (BK/LG) and grounded on circuit 57 (BK). A reverse input is supplied to the automatic dimming mirror on circuit 140 (BK/PK). When REVERSE is selected, the interior rear view mirror will receive input voltage from the digital transmission range (TR) sensor indicating that REVERSE has been selected. The power input supplied to the interior rear view mirror causes the mirror to cancel any dimming function currently operating and return to a full bright status. When the transmission range selector lever is moved out of REVERSE the mirror returns to normal operation and resumes any dimming functions that were interrupted.