Power Mirror System Operation w/A43

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The outside rear view mirror switch supplies power and ground inputs to the memory seat module (MSM) for use in driving the driver and passenger outside rearview mirror horizontal and vertical motors. When the MSM recognizes the input combination, it moves the appropriate mirror motor in the requested direction.

The MSM receives inputs from the mirror position sensors during Memory 1 and Memory 2 recall. The potentiometers in the position sensors vary in resistance as the motors move the mirror. The MSM receives a variable voltage input depending on the resistance of the potentiometer. During memory set, the MSM records the voltages across the mirrors. During memory recall, the MSM moves the mirror motors until the voltage across each potentiometer matches the recorded voltage.