Hyundai Sonata LF Owner's Manual page 130

Convenient features of your vehicle
The outside rearview mirrors will
automatically revert to their original
positions if any of the following occur:
The ignition switch is pressed to
either the LOCK/OFF position or the
ACC position.
• The shift lever is moved to any
position except R (Reverse).
• The remote control outside rearview
mirror switch is not selected.
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