Before I go further I'm just going to show the stop points for the mirror folded up and then down.
This is for the folded up position stop points:
The red arrow points to raised area (poor angle but it's all I have)
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That raised area butt's up against this part
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This shows the unfolded down position stop points:
There are 3 arrows and these point to 3 locking points that are all the same
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One of those points catches this pin
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If the mirror unfolded down and went too far the only reason it eventually stops is because the power is shut off. Power to the powerfold motor is timed. The reason the mirror went too far is because the pin is stuck in the up position. If the power didn't shut off the mirror would just go round and round.
This pin can be serviced. If you remove the glass, glass motor and mirror cap you will get access to the pin.
It's here:
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Try spraying wd40 or anything you have up there and try and flick the pin with a tiny screw driver or stanley knife blade.
If you can't free it the only option is complete disassembly of the mirror. There is a hole behind it you can push a needle through to push it out.
Edit: You could actually drill a hole through the plastic just above the pin. Wants to be a good size (5mm.) The other side of the plastic is metal casing so you won't damage anything. Later photos below of the complete strip down will show the hole you are drilling through to find:
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If your mirror gets stuck in the up position then this could be a big problem.
Fold your mirrors up and whilst doing so record the sound, on the mirror which gets stuck, as close to the unit as you can where the pin is. Play the recording back and listen carefully for a click. You may not be able to hear it because the motor is so noisy. If you do hear a click then the mirror is turning too far. This means something is worn and you need to disassemble the unit to try and fix it.
You can try spraying wd40 into the unit in the hope it does something and the point you need to concentrate on is this gap all the way round:
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Between the black plastic and greenish metal. Anywhere else will do nothing.
Will write up the full strip down of the motor and cogs and everything tomorrow.
