New LED lights in 2009 c300 low beams not working!

Aug 6, 2023 | 06:50 PM

pr0x7

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Joined: Aug 2023

Posts: 2

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2009 c300 (w204)

New LED lights in 2009 c300 low beams not working!

Just recently got this car and I absolutely love it,
Didn't love the orange headlights so i decided to get some new white led's. (all h7 LED's)

Amazon.com: FAHREN H7 LED Headlight Bulb, Upgrade 300% Super Bright H7 LED Bulb, Non-Polarity Plug and Play All-in-One Conversion Kit, No Adapter Required, Pack of 2 : Automotive

Amazon.com: FAHREN H7 LED Headlight Bulb, Upgrade 300% Super Bright H7 LED Bulb, Non-Polarity Plug and Play All-in-One Conversion Kit, No Adapter Required, Pack of 2 : Automotive

Just installed them and the high beams work great! But the low beams flick on for a split second then off and wont come back on unless I turn the key to the off then back on. I thought that the high beams and low beams were both h7 and that I could put the same bulb in them. Maybe I was wrong? I've checked all the associated fused and all is good. Connections to the lights are also fine as far as I can tell. Would really love some help if anyone has had any similar issues. All the issues I've seen are fuse related and mine seems to be fine, so I'm lead to believe I made an error with the bulb choice?

Aug 6, 2023 | 07:49 PM

gamma300C

Super Member

Joined: Jun 2017

Posts: 608

Likes: 107

From: Western NC

2009 MB C300 Sport 4matic

Both bulbs are H7's..try getting the CANBUS decoder the Amazon Seller mentions (usually at no cost). Low beam circuit may be more sensitive to voltage/amp draw than the high beam circuit.

Aug 6, 2023 | 10:15 PM