GMC Sierra 2010 Owner's Manual page 303

3. Press the button until the minute numbers begin
to flash, then turn the
decrease the minutes.
4. Press the button until the 12HR or 24HR time
format begins to flash, then turn the
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 set the time and date:
1. Turn the ignition key to ACC/ACCESSORY or
ON/RUN, then press 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.
knob to increase or
knob to
O
button to turn the
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.
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.
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