GMC 2012 Sierra Series Owner's Manual page 147

4. Press the button until the
12HR or 24HR time format
begins to flash, then turn the
knob to change the time
format.
5. Press the button again until
the clock display stops flashing
to set the currently displayed
time, or wait until the flashing
stops after five seconds and the
current time displayed
automatically sets.
MP3 Radios with a Single CD
or a Single CD and DVD Player
To adjust the time and date:
1. Turn the ignition key to ACC/
ACCESSORY or ON/RUN, then
O
press the button to turn the
radio on.
2. Press the button to display
HR, MIN, MM, DD, YYYY (hour,
minute, month, day, and year).
3. Press the softkey located under
any one of the tabs to change
that setting.
4. To increase the time or date, do
one of the following:
Press the softkey below the
selected tab.
Press the SEEK button.
\
Press the FWD button.
Turn the knob clockwise.
5. To decrease the time or date, do
one of the following:
Press the SEEK button.
s
Press the REV button.
Turn the knob
counterclockwise.
I n f o r ma t i o n P r o v i d e d b y :
Instruments and Controls
To change the time default setting
from 12 hour to 24 hour or to change
the date default setting from month/
day/year to day/month/year:
1. Press the button and then the
softkey located below the
forward arrow tab. 12H, 24H, the
date MM/DD (month and day),
and DD/MM (day and month)
displays.
2. Press the softkey located below
the desired option.
3. Press the button again to
apply the desired option, or let
the screen time out.
MP3 Radio with a Six-Disc CD
Player
To set the time and date:
1. Turn the ignition key to ACC/
ACCESSORY or ON/RUN, then
O
press the button to turn the
radio on.
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