2003 Mercedes SLK-Class Owner's Manual - Page 115

Controls in detail Audio system Button and soft key operation In these instructions, the alpha-numeric keypad (right side of radio face) and the function buttons (left side of radio face) are referred to as "buttons" and the four keys under the display are referred to as "soft keys". i The radio can also be switched on even if the key is not inserted in the steering lock, but will switch itself off automatically after one hour to conserve vehicle battery power. Adjusting the volume Turn the control knob. Turning the knob clockwise will increase the volume, counterclockwise will decrease the volume. Audio functions Bass Press the AUD key repeatedly until BASS appears in the display. Treble i Do not press directly on the radio display face. Operation Switching on and off Press control knob a. The radio is switched off when you turn the key in the steering lock to position 0 or remove it from the steering lock. The radio is switched on again when you turn the key in the steering lock to position 1 or 2. Press the AUD key repeatedly until TREBLE appears in the display. Press the + key to increase or the - key to decrease the level. The AUD key is used to select the BASS, TREBLE and BALANCE functions. Settings for bass and treble are stored separately for the cassette and CD modes. Tone level settings are identified by the vertical bars. The center (flat) setting is shown by one longer bar in the center of the display. 115