C 280 (202.029) V6-2.8L (112.920) (1999)
Power Mirror Position Switch/Sensor: Description and Operation
Model
210 (except 210.081/281) as of March 1, 1997 with code(275a) Memory package(driver's seat, steering column, rearview mirrors.)
Model
208 with Code(275b) Memory package (driver's seat, rearview mirrors.)
A potentiometer is located in each of the outside rearview mirror adjustment motors (M21/6m1 and M21/6m2) or (M21/7m1 and M21/7m2). These
potentiometers are connected to the associated door control module. The beginning and end of the two potentiometers are connected in parallel between
ground and a positive voltage. The voltage at the potentiometer tap is dependent on the mirror position. This voltage is read in by the door control
module.