Originally Posted by X5M-ISH

I have one of two mirrors that fold, but I suspect that the problem is in the switch in the driver side door than the actual mirror motor. What I found today:

Passenger side mirror:
*cover has been removed before.
*the entire motor assembly was clocked 90 degrees counter-clock on the mirror assembly (that attaches to the A-pillar).
*inside the motor assembly all gears moved freely (this is good)
*the actual gear on the motor shaft works
*the entire assembly was absolutely misaligned by whoever installed it
-the base of the motor was off 90 degrees
-the inner ring gear was out of its four respective grooves
-the entire inner assembly with the inner ring gear was out of phase 90 degrees to the outer motor assembly casing
-the actual folding part of the mirror was then out of phase by 33 degrees to the motor housing

The entire assembly is finally aligned. However...

*both the driver side and passenger side mirrors needed to be repaired at that tiny little sensor with the metal tongue that senses when the mirrors are open/closed
*passenger side metal tongue was just rattling about off the sensor

Those metal tongues are fixed, but here is why I suspect a faulty switch and unfortunately I don’t have access to my multi-meter:

At the drivers switch:
*driver side mirror is fully functional as in I can adjust glass angles vertically and horizontally
*passenger side mirror only adjusts vertically. Horizontal adjustment happens only one tiny bit at a time irrespective of holding down the adjustment button
*the glass by hand can be normally moved around by hand
*reverse tilt works and returns

Memory recall function:
*recall function causes the passenger mirror to fold in and not fold out
*recall function does nothing to the driver side mirror

Folding mirror button:
*driver side does nothing
*passenger side folds in but not out

If there is a mirror reset procedure, let me know else I am open to suggestions!