2006 Mercedes C-Class Owner's Manual - Page 102

Controls in detail Locking and unlocking Global locking Press button ‹. With the trunk and all doors closed, all turn signal lamps flash three times. The locking knobs in the doors move down. The anti-theft alarm system* is armed. Restoring to factory setting Press and hold buttons Œ and ‹ simultaneously for about 6 seconds until battery check lamp 5 flashes twice. The SmartKey is set to factory setting again. ! 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 101) and replace them if necessary ( page 396). Use the mechanical key to unlock the driver's door ( page 389) and the trunk ( page 390). Use the mechanical key to lock the driver's door ( page 390) and the trunk ( page 106). Have the vehicle battery and the battery connections checked ( page 412). If the SmartKey is malfunctioning, contact an authorized Mercedes-Benz Center. Checking the batteries Press button ‹ or Œ. Battery check lamp 5 comes on briefly to indicate that the SmartKey batteries are in order. i If battery check lamp 5 does not come on briefly during check, then the SmartKey batteries are discharged. Replace the batteries ( page 396). You can obtain the required batteries at any authorized Mercedes-Benz Center. i If the batteries are checked within signal range of the vehicle, pressing the ‹ or Œ button will lock or unlock the vehicle accordingly. 101