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Headlights Flicker

Tiny
JITHIN MATHEW
  • MEMBER
  • 2011 MERCEDES BENZ C300
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 78,000 MILES
Hello, I had bought Cougar Motor LED headlights to convert my halogen projector lights to brighter LED's. This car has factory led daytime strip on the bottom. When I installed the headlights, the lights work for like 2 minutes and then after that it would start flickering. I am not getting any dashboard errors. They sent me some resistors to install which didn’t help it either and they also sent me new pair of bulbs. Both of them are doing the same thing. I have seen other cars with converted LED's that is working perfectly fine. Please help me with this.
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Wednesday, April 29th, 2020 AT 7:00 PM

15 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Usually flickering is associated with a ballast but I'm sure yours does not have any. I've attached a picture below. Is this the plug and play style you installed? Hope this helps and thanks for using 2CarPros.
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Wednesday, April 29th, 2020 AT 8:50 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
Yes this is the one. I bought them from Cougar directly.
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+1
Thursday, April 30th, 2020 AT 12:10 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Do you happen to have or remember the order number? I'm trying to contact the technical assistance department directly. Thanks again.

Danny-
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Thursday, April 30th, 2020 AT 11:15 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
114-0681513-7176264. This is the order number.
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Friday, May 1st, 2020 AT 8:00 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

They replied back by saying that resistors and a decoder were sent. You mentioned resistors you installed that didn't work. What was the encoder?
Email response is attached below. Let me know. Hope this helps and thanks again for using 2CarPros.

Danny-
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Friday, May 1st, 2020 AT 9:17 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
Yes that’s correct. I installed the resistors and decoders the way they told me to but the headlights were still behaving the same as before which in this case was flickering.
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Friday, May 1st, 2020 AT 9:38 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
Hello,

The headlight will flicker when the front SAM control unit is going out. Here is how you can replace the unit in the diagrams below. Check out the diagrams (below). Please let us know what you find.
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Monday, May 4th, 2020 AT 12:29 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
I don’t think it’s the front SAM module as the halogen bulbs are working without any flickering issue.
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Monday, May 4th, 2020 AT 1:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
"headlights were still behaving the same as before" so I thought the headlights before were flickering. It sounds like the new lights and ballasts are defective which is common. I would would send those back and get another set.
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Tuesday, May 5th, 2020 AT 10:33 AM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
I did send that back and they gave a new one and it was still doing the same thing.
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Tuesday, May 5th, 2020 AT 12:34 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
I would think the LED light are not compatible with your lighting system. The headlight only flicker when they are installed can you try another brand? It sounds like the resistance is off.
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Thursday, May 7th, 2020 AT 9:55 AM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
Can you recommend a brand for me? I’ve seen a lot of Lasfit bulbs installed on Mercedes.
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Thursday, May 7th, 2020 AT 10:47 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
I am not big on changing the bulbs but if you see Lasfit bulbs working I would try those. Also if you go on Amazon the reviews should tell you if they work okay or not.
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Thursday, May 7th, 2020 AT 10:51 AM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
All the cars that I saw with converted LED's had halogen fog lights. I have LED daytime in the bottom. So I am hesitating to buy any bulbs at the moment.
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Thursday, May 7th, 2020 AT 11:10 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

I found a site you can look at that deal with led lights. It's called Headlight Experts. I've attached a picture below. Hope this helps and thanks again for using 2CarPros.

Danny-
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Friday, May 8th, 2020 AT 4:45 PM

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