2004 Mercedes CLK-Class Owner's Manual - Page 91

Controls in detail Locking and unlocking To lock or unlock the vehicle, the SmartKey with KEYLESS-Go must be located outside the vehicle within approximately 3 ft (1 m) of a door or the trunk. In order to start the engine with the SmartKey with KEYLESS-GO: the SmartKey with KEYLESS-GO must be located in the vehicle all the doors must be closed the brake pedal must be depressed If you have started the engine with the KEYLESS-GO start/stop button, you can only turn it off again with this button, even if you have put the SmartKey in the starter switch in the meantime. This does not apply if, after starting, the gear selector lever is still in position P. and the SmartKey is then inserted in the starter switch. The SmartKey will then have priority over the KEYLESS-GO function and the vehicle's electrical system will operate according to the position of the SmartKey in the starter switch, even stopping the engine. If the SmartKey with KEYLESS-GO is positioned farther away from the vehicle the system may no longer recognize the SmartKey with KEYLESS-GO. The vehicle cannot be locked or the engine started via the KEYLESS-GO system. If the SmartKey with KEYLESS-GO is removed from the vehicle while the ignition is switched on (e.g. if passenger exits the vehicle with the SmartKey with KEYLESS-GO), the message Key not recognized! will appear in the multifunction display. Find the SmartKey with KEYLESS-GO or change its present location immediately (e.g. place it on the front passenger seat or insert it in shirt pocket). Remember that the engine can be started by anyone with a SmartKey with KEYLESS-GO that is left inside the vehicle. If you leave the SmartKey with KEYLESS-GO behind when exiting and locking the vehicle, the message Key recognized in vehicle! will appear in the multifunction display. 91