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If you move the mirror to the extreme inside you can get two fingers behind the glass and pop it off the "X" trunion. Then you can see what's up and decide how to proceed.
I have my mirrors apart and tested them. The up and down works on both but the left to right does not. No sure If I broke em or what. Right now they are not hooked in the X, but I should be able to see some kinda movement. It makes a noise as if it wants to move.\
Its not the switch as I can feel it being loose with no tension.
Here is a pics The problem is in the rubber boot which moves the glass.
Dan I am not trying to beat a dead horse but I had the exact same issue - BUT I swapped mirrors to test the motors. I found the up and down issue stayed on the drivers side.... The passenger mirror did not work plugged into the drivers side yet the drivers worked on the passenger side. Make sure before you proceed.
As you can see there are two rubber boots. One of them is secure feeling, it feels attached. The left to right does not work and does not feel attached (which is why its not working).
I have bench tested this also ITS NOT THE SWITCH.
I have the mirror all together and it flops from right to left. Not because of the X, but becuase the arm in this rubber boot is broken or not connected. There for it can not conrtol in and out. It aslo will not keep the mirror in place becase its not connected.
Getting ready to cut the boot open.
I thought there was a fix some where its only that one arm in the rubber boot.
I found my fix. I guess in all cases you are best separating the glass from the mirror, the mirror from the motor, the motor from the bracket, and the bracket from the metal mirror its self.
I ended up sliding the boot off. Have to break the glue. The arm works by a rod that screws in and out. On the end it connects to the mirror. That was where my problem was. It popped of. And with out moving the boot off I would not have known where to put it in (lined up).
My remedy was to completely take the glass off, so i had to remove the two arm from connecting to the glass. and Disconnect the X union.
Then pun the screw sticking out fully. After all mirror pieces are screwed together, then I poped my arms in the glass. Then the glass into all connections (arms and X union).