GMC 2006 Sierra - Manual (Page 153)

{ CAUTION:
Four-wheel drive vehicles with the transfer
case in NEUTRAL will allow the vehicle to roll,
even if your automatic transmission shift lever
is in PARK (P). So, be sure the transfer case is
in a drive gear — not in NEUTRAL. Always set
your parking brake.
Follow the proper steps to be sure your vehicle
will not move. See Shifting Into Park (P) (Automatic
Transmission) on page 2-53.
If you are pulling a trailer, see Towing a Trailer on
page 4-67.
Mirrors
Manual Rearview Mirror
Pull or push the tab under the mirror to adjust it to the
night or daytime setting. In the nightime setting, the glare
from headlamps behind the vehicle will be less intense.
Automatic Dimming Rearview Mirror
with OnStar
® and Compass
Your vehicle may have an automatic-dimming rearview
mirror with a compass and the OnStar
® system.
There are three additional buttons for the OnStar ®
system. See your dealer for more information on the
system and how to subscribe to OnStar
® . See OnStar ®
System on page 2-73 for more information about the
services OnStar
® provides.
Mirror Operation
When turned on, this mirror automatically dims to the
proper level to minimize glare from any headlamps
behind you after dark.
O (On/Off): This is the on/off button for the automatic
dimming feature and compass. Press the far left button,
located below the mirror face, for up to three seconds
to turn the feature on and off. A light on the mirror will
be lit while the feature is turned on.
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