If you move the mirror selector switch on the driver's door to the passenger mirror side and leave it there, that is supposed to deactivate the mirror from tilting in reverse. At least that is the way mine is on my '01.

Wish I had folding mirrors...

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!