Oldsmobile 1999 Alero - Manual (Page 104)

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Mirrors
Inside Day/Night Rearview Mirror
This mirror can be adjusted two ways. First, to adjust
the angle of the mirror, move the mirror to a position
that allows you see to out the back window. To adjust
the height of the mirror, adjust the arm that connects the
mirror to the windshield.
To reduce glare from lights behind you, move the lever
toward you to the night position. To return the mirror to
the daytime position, move the lever away from you.
Manual Remote Control Mirror
The outside rearview mirror should be adjusted so you
can just see the side of your vehicle when you are sitting
in a comfortable driving position.
Adjust the driver’s side outside mirror with the control
lever on the driver’s door.
To adjust your passenger’s side mirror, sit in the driver’s
seat and have a passenger adjust the mirror for you.