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Passenger side headlight not working

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Old 02-20-2008, 08:34 PM
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Unhappy Passenger side headlight not working

Guys, my entire passenger side headlight is not working. None of the lights on that side work, no turn signal, low beam, high beam, etc... I've check the list of fuses and I don't see which one could be out to cause this. Does anyone know what could be the cause of this problem? Thanks
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Old 02-21-2008, 12:16 AM
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Originally Posted by Keyrat View Post
Guys, my entire passenger side headlight is not working. None of the lights on that side work, no turn signal, low beam, high beam, etc... I've check the list of fuses and I don't see which one could be out to cause this. Does anyone know what could be the cause of this problem? Thanks
Pull up the hood and check the two wire harness's that plug into the back of the headlamp ( there is one large/wide and one small one) The larger one being un-plugged could be the culprit. There is a fuse chart posted on benzworld.
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Old 02-21-2008, 09:53 AM
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You are exactly correct, the larger plug was slightly unplugged. Thanks for the fix Vader55! Now I can see where I'm going!!!!
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Old 10-27-2008, 10:37 AM
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'00 S430
W220 Head light / lamp fuse or relay

Friends:
I am in the same spot, hence this nudge to the top of this old post:

1. W220 S430, yr. 2000.
2. My lowbeam driver's side is out, but the bulb is fine (as is the replacement bulb that I installed). So, I presume a fuse issue. The fuse chart does not specify a fuse number.
3. Prior posts instruct: that the fuse for the head lights of the W220 is controlled by the "SAM Unit".
4. Forgive my ignorance, but what is the "SAM Unit"?

Any guidance is appreciated.
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Old 10-28-2008, 12:07 AM
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In addition to what has been suggested, it could also be a bad ballast resistor.

SAM is "Signal Acquisition Module." It functions as kind of a router, accepting signals from various controls and sensors, and routing the signals to the proper location to cause an action. A W220 has three of them - one under each front seat and one under the back seat.

The SAM unit does not "control" a fuse; but it would control the signals to operate a device on a fused circuit.
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Old 01-26-2009, 06:31 PM
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Hey. I don't see an answer to your question. I ran into the same problem. I have replaced the high beam H7 - 55w bulb with a 100% identical one and it no longer turnes on. I have tested on the right side and i screwed it up there too. Now I have no high beam at all on both sides. I have tried to search online but found no answer to this. My low beam works 100% and all the other bulbs in the headlight except the high beam. Is that a fuse and if it is where would I find it? Thank much
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Old 01-26-2009, 07:31 PM
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Ring a Ding's question was answered, as far as we know; he gave us no further feedback.

Regarding yours, if I were tinkering with my car and getting more failures than I started with, I'd realize I don't know what I am doing and take it to my dealer.
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Old 01-27-2009, 08:18 AM
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'00 S430
Low beam issue. . .

Somewhat consistent with Skylaw's advice, I punted and ended up going to my independent mechanic. He reported it was a fuse issue. For the 2000 S Class, the fuse is located under the rear seat, passenger side. I must have pulled the wrong one when I changed the fuses (if I recall, it is difficult to track the numbering of the fuses).
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