2012 GMC Sierra Owner's Manual - Page 145

Instruments and Controls To calibrate the compass, use the following procedure: Compass Calibration Procedure 1. Before calibrating the compass, make sure the compass zone is set to the variance zone in which the vehicle is located. See "Compass Variance (Zone) Procedure" earlier in this section. Do not operate any switches such as window, sunroof, climate controls, or seats during the calibration procedure. 2. Press the vehicle information button until PRESS V TO CALIBRATE COMPASS displays. Or, if the vehicle does not have DIC buttons, press the trip odometer reset stem until CALIBRATE COMPASS displays. 3. Press the set/reset button to start the compass calibration. Or, if the vehicle does not have DIC buttons, press and hold the trip odometer reset stem for two seconds to start the compass calibration. 4. The DIC will display CALIBRATING: DRIVE IN CIRCLES. Drive the vehicle in tight circles at less than 8 km/h (5 mph) to complete the calibration. The DIC will display CALIBRATION COMPLETE for a few seconds when the calibration is complete. The DIC display will then return to the previous menu. 5-7 Clock AM-FM Radio and AM‐FM Radio with CD Player To set the clock: 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.