Headlamp High/Low-Beam Changer; Flash-To-Pass - GMC Sierra Denali 2009 Owner's Manual

Turn Signal On Chime
If the turn signal is left on for more than 3/4 of a mile
(1.2 km), a chime sounds at each flash of the turn
signal and the message TURN SIGNAL ON also
appears in the Driver Information Center (DIC). Move
the turn signal lever to the off position, to turn the chime
and message off.

Headlamp High/Low-Beam Changer

5 3 (Headlamp High/Low Beam Changer): Push
the lever toward the instrument panel, to change
the headlamps from low to high beam.
Pull the multifunction lever toward you and release it, to
return to low-beam headlamps.
3-8
When the high beams are
on, this indicator light on
the instrument panel
cluster will also be on.

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.