2008 Mercedes SLK-Class Owner's Manual - Page 197

Controls in detail Audio system Button and soft key operation In these instructions, the alphanumeric keypad (right side of radio panel) and the function buttons (left side of radio panel) are referred to as "buttons". The four keys below the display panel are referred to as "soft keys". Operation Switching the unit on/off Switching on Turn the SmartKey in the starter switch to position 1 or 2 ( page 37). If the audio system was on as you removed the SmartKey from the starter switch, the audio system will automatically come back on as you turn the SmartKey to position 1 or 2. or Press D button. or Press D button. Switching off Remove the SmartKey from the starter switch. ! Do not press directly in the display face. Otherwise, the display will be damaged. i Should excessively high temperatures occur while the audio system is being operated, the display will dim. If temperatures continue to rise, HIGH TEMP will appear in the display, after which the audio system will be switched off for a cooling-down period. Adjusting the volume Turn rotary control of E button. The volume will increase or decrease depending on the direction turned. i If the radio is switched on without the SmartKey in the starter switch, it will automatically switch off again after approximately 30 minutes. If your vehicle is equipped with a mobile telephone*, the display may prompt you to enter your PIN (GSM network) or code (TDMA or CDMA network). i If your vehicle equipment includes a Mercedes-Benz specified mobile telephone*, you can adjust its volume separately from the volume of the audio system while the telephone is being used. 196