I'm not sure what is going on because the system is straight forward. Fuse/switch/motors. Here is a wiring diagrams for the mirror so you can see how that work. Must be the switch is bad. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Tuesday, October 1st, 2019 AT 1:26 PM