Question about 2007 Mercedes-Benz S550 Sedan

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Headlights Will not go off

Has anyone had the problem that they can not shut off the lights. I drive my care during the day and I dont use the headlights. I have the Day Time Running Lights option set to OFF and my knob that manages the lights is set to off as well. Both my headlights go on when I turn on the car and say on no matter what I do. This was not the case when I bought the car and it just happened one day.

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  • pieter27 Apr 02, 2009

    I drive a MB C270 CDI and a minute or so after I started the card the lights come on automatically, whatever you do, it stays on. I have turned the knob in any direction but the problem won't go away.

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I took the car to the dealer and it was one or more sensors that had failed. It caused the lights to stay on and clock and other areas of the dash stayed very faint. It took about a day to figure out what was wrong and to repair. When I got to the dealer they tried to do all kinds of things from command until they realized this was not just a setting. Other than that issue the car has been fantastic. We who own these fine cars should feel very fortunate to be able to drive them.

Posted on May 14, 2008

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I would check all the fuses related to headlights, check the bulbs and check the switch, then last the light sensor on the dash.

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Robert

Please take a moment to rate this solution.. thanks

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1 Answer

Headlights wont work


Well...lets start with the obvious. Check fuses and NEVER piggyback any stereo or security stuff into their fuses...you dont want the lights to shut down during a night drive!!
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The Daytime Running Lamps are a "straight through wiring configuration". Doubt it even goes through a headlight switch at all.
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Turn the light switch on...looking at the instrument cluster , can you make the high-beam-indicator light come on?
As you rotate the headlight switch knob...does the instrument panel lights brighten or dim? You probably have a faulty headlight switch...auto stores have them...they simply plug in.

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