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

Flickering hi/ lo beam while driving

Old Nov 18, 2017 | 02:32 AM
  #1  
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Flickering hi/ lo beam while driving

while driving and when I turn on the lights, in any position, they randomly flicker between high and low beams and usually stop and are stuck on high. I fiddle with the light stem (flicking between high and low) and finally can get them to go onto low. They will stay like this for quite a while until I use the turn signal or flick to high beam. Fog lights stay on sometimes when I turn the car off. The lights are original to the car.
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Old Nov 18, 2017 | 11:20 AM
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Wrong info. Disregard this post.

Last edited by Maj. Dundee; Nov 19, 2017 at 02:13 AM.
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Old Nov 18, 2017 | 03:09 PM
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???

How does this involve flickering lights? Is this some sort of a reset?
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Old Nov 19, 2017 | 02:12 AM
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Originally Posted by Gayle
How does this involve flickering lights? Is this some sort of a reset?
Sorry, I posted this info on the wrong thread.
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Old Aug 11, 2018 | 05:34 PM
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w163 ML350 2005
Hi,,,
did you manage to fix the issue? I am facing same wrong behavior!!!
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Old Aug 11, 2018 | 10:30 PM
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Originally Posted by Mohd naimi
Hi,,,
did you manage to fix the issue? I am facing same wrong behavior!!!
Hi,

Yes we got it fixed, it was the master control, about 4 thousand dollar fix. Car runs like new now.
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Old Aug 12, 2018 | 05:47 AM
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What is master control?
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Old Aug 12, 2018 | 03:44 PM
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Hi,

The unit is actually called the All Activities Module or AAM. We replaced that and the problem was fixed.
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Old Aug 13, 2018 | 07:20 AM
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Originally Posted by Gayle
Hi,

The unit is actually called the All Activities Module or AAM. We replaced that and the problem was fixed.
Gayle, if you fiddled with the light stalk and everything went back to normal, most of the time, then it cannot be the AAM.

The light switch was at fault and should have been replaced. The dealer took you for a 4k ride.
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