2008 Mercedes R-Class Owner's Manual - Page 107

Safety and Security Anti-theft systems Immobilizer The immobilizer prevents unauthorized persons from starting your vehicle. Activating With the SmartKey Remove the SmartKey from the starter switch. With KEYLESS-GO* Press the KEYLESS-GO start/stop button ( page 41) once. The engine is turned off. Open the driver's door. Deactivating With the SmartKey Turn the SmartKey in the starter switch to position 2 ( page 39). With KEYLESS-GO* Switch on the ignition ( page 39). Anti-theft alarm system Once the alarm system has been armed, a visual and audible alarm is triggered when someone opens a door the tailgate the hood The alarm will stay on, even if the activating element (a door, for example) is immediately closed. The alarm system will also be triggered when the vehicle is opened with the mechanical key, see "Unlocking the vehicle" ( page 474) a door is opened from the inside, see "Opening the doors from the inside" ( page 118) i Starting the engine will also deactivate the immobilizer. In case the engine cannot be started (yet the vehicle's battery is charged), the system is not operational. Contact an authorized Mercedes-Benz Light Truck Center or call 1-800-FOR-MERCedes (in the USA), or 1-800-387-0100 (in Canada). 106