2008 Mercedes S-Class Owner's Manual - Page 338

Controls in detail Locking and unlocking Always carry the SmartKey with KEYLESS-GO with you. Never store the SmartKey with KEYLESS-GO together with: Electronic items such as a mobile phone or another SmartKey with KEYLESS-GO Metallic objects such as coins or metal foil Doing so could impair the function of the KEYLESS-GO system. 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 lid. If the vehicle has been parked for more than 72 hours, you must pull an outside door handle in order to activate the KEYLESS-GO function. In order to start the engine with the SmartKey with KEYLESS-GO: The SmartKey with KEYLESS-GO must be located in the vehicle. The KEYLESS-GO start/stop button must be inserted in the starter switch ( page 346). The brake pedal must be firmly depressed. Do not depress the accelerator. 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 then cannot be locked or the engine started via the KEYLESS-GO system. If the SmartKey with KEYLESS-GO is removed from the vehicle (e.g. if passenger exits the vehicle with the SmartKey with KEYLESS-GO) when pressing the KEYLESS-GO start/stop button or trying to lock the vehicle with the outside door handle the message "Key not recognized" appears in the multifunction display with the engine running, the message "Key not recognized" appears in the multifunction display while driving off 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). If you have started the engine with the KEYLESS-GO start/stop button, you can turn it off again with: the KEYLESS-GO start/stop button the SmartKey with KEYLESS-GO inserted in the starter switch, when the automatic transmission is in park position P 337