GMC 2009 Sierra - Manual (Page 145)

Flash-to-Pass
This feature lets you use the high-beam headlamps to
signal a driver in front of you that you want to pass.
It works even if the headlamps are in the automatic
position.
To use it, pull the turn signal lever toward you, then
release it.
If the headlamps are in the automatic position or on low
beam, your high-beam headlamps turn on. They will
stay on as long as you hold the lever toward you.
The high-beam indicator on the instrument panel cluster
comes on. Release the lever to return to normal
operation.
Windshield Wipers
Clear ice and snow from the wiper blades before using
them. If they are frozen to the windshield, gently
loosen or thaw them. Damaged wiper blades may not
clear the windshield well, making it harder to see
and drive safely. If the blades do become damaged,
install new blades or blade inserts. For more information,
see Windshield Wiper Blade Replacement on page 5-57.
Heavy snow or ice can overload the wiper motor.
A circuit breaker will stop the motor until it cools down.
Clear away snow or ice to prevent an overload.
Turn the band with the wiper symbol to control the
windshield wipers.
8 (Mist): Turn the band to mist for a single wiping
cycle. Hold it there until the wipers start. Then let
go. The wipers stop after one wipe. Hold the band on
mist longer, for more wipe cycles.
9 (Off): To stop the wipers, move the band to off.
6
(Delay): Turn the band to adjust the delay time.
The delay between wiping cycles becomes shorter as
the band is moved to the top of the lever. This can
be very useful in light rain or snow.
6 (Low Speed): Turn the band away from you to
the first solid band past the delay settings, for steady
wiping at low speed.
?
(High Speed): Turn the band further, to the
second solid band past the delay settings, for
high-speed wiping.
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