2004 Chevrolet Impala Owner's Manual - Page 214

Audio Steering Wheel Controls If your vehicle has this feature, you can control certain radio functions using the buttons on your steering wheel. SEEK TYPE: Press this button to go to a station with the last selected PTY and the last selected PTY will appear on the display, if it is not already showing. If a station with the selected PTY is not found, the radio will return to the original station. If both SEEK TYPE and TRAF are on, the radio will search for stations with the selected PTY and traffic announcements. PRESET: Press this button to play a station you have programmed on the radio preset pushbuttons. MODE: Press this button to choose FM1, FM2, AM, or XM1 or XM2, (48 contiguous US states, if equipped). If a cassette tape or CD is playing, it will stop and the radio will play. MUTE: Press this button to silence the system. Press it again to turn on the sound. Q SEEK R: Press the up or the down arrow to seek to the next or to the previous station. If a cassette tape or CD is playing, the player will advance with the up arrow and reverse with the down arrow. Holding SEEK for three seconds or more will activate the preset scan mode. Q VOL R (Volume): Press the up or the down arrow to increase or to decrease volume. 3-92