Setting The Time; Radio With Cassette And Cd - GMC Sierra Denali 2006 Owner's Manual

Setting the Time

Press and hold the HR button until the correct hour
appears on the display. Press and hold the MN button
until the correct minute appears on the display. The time
can be set with the ignition on or off.
To synchronize the time with an FM station broadcasting
Radio Data System (RDS) information, press and hold
the hour and minute buttons at the same time until
RDS TIME appears on the display. To accept this time,
press and hold the hour and minute buttons, at the
same time, for another two seconds. If the time is not
available from the station, NO UPDAT will appear on
the display.
RDS time is broadcast once a minute. After tuning to an
RDS broadcast station, it may take a few minutes for
the time to update.
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Radio with Cassette and CD

Radio Data System (RDS)
The audio system has a Radio Data System (RDS).
RDS features are available for use only on FM stations
that broadcast RDS information.