2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 310

Setting the Clock AM-FM Radio To set the time: 1. Turn the ignition key to ACC/ACCESSORY or ON/RUN, then press the O button to turn the radio on. 2. Press the H button until the hour numbers begin to flash, then turn the f knob to increase or decrease the hour. 3. Press the H button until the minute numbers begin to flash, then turn the f knob to increase or decrease the minutes. 4. Press the H button until the 12HR or 24HR time format begins to flash, then turn the f knob to change the time format. 5. Press the H 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 O button to turn the radio on. 2. Press the H 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. ¨ SEEK button. Press the \ FWD button. Turn the f knob clockwise. Press the 5. To decrease the time or date, do one of the following: ... © SEEK button. Press the s REV button. Turn the f knob counterclockwise. Press the 4-86