Trying to confirm as well
Thanks mankind......I currently have both door panels off waiting for my door-lock motors to arrive for replacement.
I looked inside and out side the door and there is no mirrior ecm. Cruiser parts say that its in the same place as well. So, This is not on the door, I have been looking below the dash for this m-ecm (on cruiser site they show an orange color box for m-ecm) but the only orange box is the door-lock ecm.
I am starting to think that the body control ecm also controls the mirror function as well as the rear wiper, there is an issue with the rear wiper.... that will not shut off.
I had found that one of (pan down and up feature not working and acting funky) the contacts in the mirror swicth was burnt up. I found this when I took it apart to inspect.
When I had put the switch back together, I purposely put together backwards to see if the pan down feature would work.
Doing this I had blown a fuse for the mirror, around the same time is when the rear wiper began to stay on all the time.