GMC 2001 Sierra - Manual (Page 136)

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Turn Signal On Chime
If your turn signal is left on for more than 3/4 of a
mile (1.2 km), a chime will sound at each flash of the
turn signal. To turn off the chime, move the turn signal
lever to the off position.
Headlamp High/Low Beam Changer
To change the headlamps from low to high beam or high
to low beam, pull the multifunction lever all the way
toward you. Then release it.
When the high beams are
on, this light on the
instrument panel also
will be on.
Flash-To-Pass Feature
This feature allows you to use your high - beam
headlamps to signal a driver in front of you that you
want to pass. It works even if your headlamps are off.
To use it, pull the turn signal lever toward you, but not
so far that you hear it click.
If your headlamps are off or on low - beam, your
high - beam headlamps will turn on. They’ll stay on as long
as you hold the lever toward you and the high - beam
indicator on the instrument panel will come on. Release
the lever to turn the high
- beam headlamps off.
Windshield Wipers
You control the windshield wipers by turning the band
with the wiper symbol on it.