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Headlight won't turn on until 5 secs

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Old 07-06-2016, 09:59 PM
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2010 Mercedes-Benz C350 4Matic
Headlight won't turn on until 5 secs

Hi guys, just a little question here and wondering anyone has some ideas.

Today I finished shopping and turned my car on, I noticed that my driver side x-non headlight was not on, but after like 5 secs, it was on again. I tried couple of times and the problem cannot be reproduced.

I checked the light bulb connection is good and wondering if something else could cause this kind of issues.

Any ideas are appreciated
Old 07-06-2016, 10:09 PM
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Xenon lights with a startup delay is almost always the ballast going bad.
Old 07-07-2016, 12:13 AM
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Thanks! It only happens once, I guess I can still wait and see? Maybe replace the control unit later cause I heard it will require the front bumper off to get that done
Old 07-07-2016, 12:17 AM
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Btw, any idea how much the control unit will cost? Better to get from dealer or online?
Old 08-09-2016, 12:54 AM
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I did change the ballast but the issue still exists... Any other ideas?
The other headlight had the same issue couple of times.

I did change cooler bulbs like half a year ago, maybe this is the reason?

It's kind of pain to change the whole headlight assembly.
Old 08-10-2016, 11:48 AM
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Originally Posted by GoSuckMyTites
I did change the ballast but the issue still exists... Any other ideas?
The other headlight had the same issue couple of times.

I did change cooler bulbs like half a year ago, maybe this is the reason?

It's kind of pain to change the whole headlight assembly.
If they're China-tastic brands from eBay I would suspect them.

Easy enough to diagnose. Swap the bulbs and see if the issue follows.
Old 08-10-2016, 03:21 PM
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Originally Posted by cvx5832
If they're China-tastic brands from eBay I would suspect them.

Easy enough to diagnose. Swap the bulbs and see if the issue follows.


Yeah, those are $30 a pair...
I did change them back to the 4500k bulbs I had, it's only a day now and it's fine.

I reordered another pair of 8000k bulbs (still just $30, dealer only provide 4500k with $250 each!) coming over next week, I will see how the 4500k performed and if they will last before I switched the 8000k.
Old 08-12-2016, 08:48 AM
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Originally Posted by GoSuckMyTites
Yeah, those are $30 a pair...
I did change them back to the 4500k bulbs I had, it's only a day now and it's fine.

I reordered another pair of 8000k bulbs (still just $30, dealer only provide 4500k with $250 each!) coming over next week, I will see how the 4500k performed and if they will last before I switched the 8000k.


230 EACH??? Jeez man, I'd be getting Chinese too!!
Old 08-12-2016, 09:23 AM
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Originally Posted by Josh.A.Hussey
230 EACH??? Jeez man, I'd be getting Chinese too!!
Yep. I think I have all the dealer quote of headlight. Whole assembly is over $2000, control unit is $690 somewhere and the bulb is $230-250.

I checked with car-parts, even from the accident car, the assembly is still around 600-800. You can have brand new aftermarket with that.
Old 08-12-2016, 09:26 AM
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dealerships are

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