M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Problem with headlights

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Old Jan 22, 2021 | 03:38 AM
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Problem with headlights

Hello, I have a problem with headlights of my ML 400 CDI 2001 year.The combination switch is changed with brand new one. When I turn on the low beam headlights both low and high beam lights turned on. I tried to change AAM module with two other AAM units, but the result is the same. I changed the unit with fuses and relays, where the AAM module is connected , also without results. I tried to move left and right the AMM module and in some position the high beams turned off .

If anyone has had the same problem I would be very grateful if you could help me !

Thank you in advance !

Last edited by gogetit; Jan 22, 2021 at 09:29 AM.
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Old Jan 22, 2021 | 07:23 AM
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2002 ML 320 & 2006 ML500
When you are having this problem, is the High Beam icon lit on the Instrument Cluster?
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Old Jan 22, 2021 | 08:01 AM
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Yes , the icon for high beam lights on when start the low beam .
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Old Jan 22, 2021 | 08:12 AM
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My guess is that there is a problem with the Combination Switch.

Try this, press the switch to make a left turn, then slightly press the switch downward. Do the high beams flicker or turn off?




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Old Jan 22, 2021 | 09:28 AM
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The combination switch is brand new. I forgot to mention it. Now i will do your test
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Old Jan 22, 2021 | 01:02 PM
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Originally Posted by gogetit
The combination switch is brand new. I forgot to mention it. Now i will do your test
Did you replace the switch because of this problem?

Where did you buy it from and what was the part # ?
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