Chevrolet 2001 Impala Owner's Manual page 167

Highbeam Out
United States
If this message appears, you may have a problem with
-
your high beam headlamps.
The message will stay on approximately 60 seconds.
When the ignition is turned off, this message will be
displayed again for three seconds to remind you that you
may have a problem with your highbeam
Be sure to check your bulbs right away and replace them
if necessary.
See "Bulb Replacement" in the Index.
Driver Information
Center (DIC) (Option)
Canada
-
headlamps.
The DIC will show information about the vehicle and
the surroundings.
Optional Sunroof Version Shown
2-97