2005 Mercedes C-Class Owner's Manual - Page 346

Practical hints Replacing bulbs Safe vehicle operation depends on proper exterior lighting and signaling. It is therefore essential that all bulbs and lamp assemblies are in good working order at all times. Correct headlamp adjustment is extremely important. Have headlamps checked and readjusted at regular intervals and when a bulb has been replaced. See an authorized Mercedes-Benz Center for headlamp adjustment. i If the headlamps or front fog lamps are fogged up on the inside as a result of high humidity, driving the vehicle a distance with the lights on should clear up the fogging. Bulbs i Substitute bulbs will be brought into use when lamps malfunction. Observe the messages in the multifunction display ( page 323) 344