M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

I am getting the Active Headlights Inoperable message. Is that a ballast replace?

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Old 03-09-2020 | 07:30 AM
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kino1161's Avatar
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2008 ML350 4Matic
I am getting the Active Headlights Inoperable message. Is that a ballast replace?

When starting the car and the headlights go through their up, down and side to side check, my driver-side headlight doesn't move. It remains in-place. Is that a ballast replace or do I need to purchase an entire new headlight? Any help would be greatly appreciated.
Old 03-09-2020 | 08:06 AM
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There is no guesswork when it comes to Xenon as every everything is extremely expensive.

The codes must be read in the left Xenon control module.
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Old 03-09-2020 | 08:38 AM
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Thanks! I'll try and pull the codes this evening.
Old 03-09-2020 | 08:47 AM
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Originally Posted by kino1161
Thanks! I'll try and pull the codes this evening.
You will need a scanner, not just a code reader, able to read all modules.

Amazon Amazon

Last edited by Maj. Dundee; 03-09-2020 at 09:00 AM.
Old 03-09-2020 | 09:13 AM
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I have a Foxwell NT520. I thought that could pull the codes.
Old 03-09-2020 | 01:15 PM
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Originally Posted by kino1161
I have a Foxwell NT520. I thought that could pull the codes.
So that means that you were not able to read codes in Xenon?
Old 03-09-2020 | 01:44 PM
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I meant to say....I think that can pull the codes. I will try this evening. On another note, do you know if I can replace with two halogen headlamps and it will not throw any codes?
Old 03-09-2020 | 02:59 PM
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Originally Posted by kino1161
I meant to say....I think that can pull the codes. I will try this evening. On another note, do you know if I can replace with two halogen headlamps and it will not throw any codes?
It will be a nightmare doing it as the wiring and sockets are entirely different.

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