Why can't the high beam of the Mercedes S be turned on?
3 Answers
It may not turn on because the automatic headlights are set in the system, so the system automatically switches the headlights based on the light sensor. How to turn on the high beam in the Mercedes S-Class: To turn on the high beam in the Mercedes S, push the left control lever forward in the driver's direction to activate the high beam. Release the lever, and it will automatically reset. Pull it back to turn off the high beam and switch back to the low beam. Mercedes S-Class automatic mode: In automatic mode, when the speed exceeds approximately 80 and there are no headlights from the opposite lane, the system will automatically switch to high beam. Once headlights from an oncoming vehicle are detected, it will switch back to low beam mode. After the vehicle passes, it will automatically switch back to high beam mode.
When I was driving my Mercedes-Benz S-Class, the high beams wouldn't turn on. The bulb might be burnt out—Mercedes uses premium bulbs with limited lifespan, and the filaments are prone to breaking under high temperatures. Alternatively, a fuse might have blown; check the relevant fuse markings in the engine compartment's fuse box. Another common cause is wear and tear on the stalk switch—the control lever behind the steering wheel might have poor contact. Mercedes' intelligent lighting system is highly sensitive, and a short circuit or a malfunction in the computer module could also cause the high beams to fail. It's best not to tinker with it yourself, as the electronic components are complex. Instead, take it to a professional shop to scan for fault codes using a diagnostic tool. Regular maintenance should include checking the headlights to prevent unexpected issues.
High beams won't turn on, posing significant risks for night driving. I strongly recommend pulling over safely before troubleshooting. The automatic high beam function on Mercedes S-Class can sometimes be accidentally disabled - check if it's activated in the lighting options of the central control settings menu. It might be a simple fuse issue; locate its position in the fuse box and replace it with a gentle pull. Don't overlook potential relay failure either - hidden in the small engine compartment box, a faulty controller can interrupt current flow. As temporary measure, use fog lights for supplemental lighting, but ultimately visit an authorized dealership for thorough repairs. Safety comes first to prevent accidents.
