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I have seen a couple of threads where someone has complained about their mirrors vibrating while driving. Today I was reading my owners manual (gotta do something while I wait for my truck) and I came across the answer.
Loose Mirror
If your power-folding mirrors are manually
folded, they may not work properly even
after you re-position them. You need to
reset them if:
• The mirrors vibrate when you drive.
• The mirrors feel loose.
• The mirrors do not stay in the folded or
unfolded position.
• One of the mirrors is not in its normal
driving position.
To reset the power-fold feature, use the
power-folding mirror control to fold and
unfold the mirrors. You may hear a loud
noise as you reset the power-folding
mirrors. This sound is normal. Repeat this
process as needed each time the mirrors
are manually folded.