Buick 2005 LeSabre Owner's Manual page 167

Setting the Time
Press and hold H until the correct hour appears on the
display. AM will appear for morning hours. Press
and hold M 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 H and M at the same time until TIME UPDATED
appears on the display. If the time is not available from
the station, NO UPDATE 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.
Radio with CD
Playing the Radio
PWR (Power): Push this knob to turn the system on
and off.
VOL (Volume): Turn this knob to increase or to
decrease the volume.
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