2005 Mercedes C-Class Owner's Manual - Page 92

Controls in detail Locking and unlocking The SmartKey will then function as follows: Unlocking driver's door and fuel filler flap Press button Œ once. All turn signal lamps flash once. The locking knob in the driver's door moves up. The anti-theft alarm system* is switched off. Global unlocking Press button Œ twice. All turn signal lamps flash once. The locking knobs in the doors move up. The anti-theft alarm system* is switched off. Global locking Press button ‹. All turn signal lamps flash three times. The locking knobs in the doors move down. The anti-theft alarm system* is activated. Restoring to factory setting Press and hold buttons Œ and ‹ simultaneously for about six seconds until battery check lamp 5 flashes twice. ! If you can no longer lock or unlock the vehicle with the SmartKey, then either the batteries in the SmartKey are discharged, the SmartKey is malfunctioning or the vehicle battery is drained. Check the batteries in the SmartKey ( page 91) and replace them if necessary ( page 343). Use the mechanical key to unlock the driver's door ( page 337) and the trunk lid ( page 338). Use the mechanical key to lock the driver's door ( page 338). Have the vehicle battery and the battery connections checked ( page 360). If the SmartKey is malfunctioning, contact an authorized Mercedes-Benz Center. 90