2003 Chevrolet TrailBlazer Owner's Manual - Page 185

Audio Systems Your audio system has been designed to operate easily and give years of listening pleasure. You will get the most enjoyment out of it if you acquaint yourself with it first. Find out what your audio system can do and how to operate all its controls, to be sure you're getting the most out of the advanced engineering that went into it. AM-FM Stereo with Cassette Tape Player with Radio Data System (RDS) and Automatic Tone Control Setting the Clock Press and hold the HR or MN buttons, located below the tune knob, for two seconds. Then press and hold HR until the correct hour appears. AM or PM will appear on the display. Press and hold MN until the correct minute appears. The clock may be set with the ignition on or off. The clock symbol will appear on the display in time-set mode. To set the clock to the time of an FM station broadcasting Radio Data System (RDS) information, press and hold HR and MN at the same time for two seconds until UPDATED and the clock symbol appear on the display. If the time is not available from the station, NO UPDAT will appear on the display instead. RDS clock time is broadcast once a minute. Once you have tuned to an RDS broadcast station, it may take a few minutes before pressing and holding the HR MN buttons will result in an update to the clock time. Playing the Radio VOL PWR: Press this control to turn the system on and off. Turn this control clockwise to increase volume. Turn it counterclockwise to decrease volume. 3-13