Low beam bulb
Super Member
Joined: Feb 2023
Posts: 728
Likes: 271
2011 GLK 350 4Matic
It's an 1157 bulb (small, two-pin bulb). I replaced mine with some high-output LED "bulbs", which (IMHO) improve the operation by making the car more visible when parked, and providing MUCH better lighting for walking away from the car after exiting at night. Some LEDs will throw an error though.
The bulbs are a little fiddly to get to and replace - basically, you reach in under the high beam bulb / socket, grab the two wires running to the marker light socket, and push down on the little tab below the marker light socket while pulling on the wires, and it should pop out easily(ish).
The bulbs are a little fiddly to get to and replace - basically, you reach in under the high beam bulb / socket, grab the two wires running to the marker light socket, and push down on the little tab below the marker light socket while pulling on the wires, and it should pop out easily(ish).
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Joined: Jun 2021
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From: South Texas
2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top
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Joined: Jun 2021
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,928
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Soft copy on my laptop, hard copy in the glove box, for emergencies!
https://www.mbusa.com/en/owners/manuals
https://www.mbusa.com/en/owners/manuals
Junior Member
Joined: Jul 2007
Posts: 40
Likes: 0
From: Memphis,TN
W203, W208, X204
It's an 1157 bulb (small, two-pin bulb). I replaced mine with some high-output LED "bulbs", which (IMHO) improve the operation by making the car more visible when parked, and providing MUCH better lighting for walking away from the car after exiting at night. Some LEDs will throw an error though.
The bulbs are a little fiddly to get to and replace - basically, you reach in under the high beam bulb / socket, grab the two wires running to the marker light socket, and push down on the little tab below the marker light socket while pulling on the wires, and it should pop out easily(ish).
The bulbs are a little fiddly to get to and replace - basically, you reach in under the high beam bulb / socket, grab the two wires running to the marker light socket, and push down on the little tab below the marker light socket while pulling on the wires, and it should pop out easily(ish).
Super Member
Joined: Feb 2023
Posts: 728
Likes: 271
2011 GLK 350 4Matic
I honestly don't recall - I do remember looking for a bulb (oxymoron) that claimed to not throw an error. I converted both my 2011 and the 2012 "project car" to LED bulbs and they both worked (and continue to work...) great.
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,928
Likes: 524
From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
I bought H15 LED replacements from Lasfit. High beam plus parking light. I don't get any errors (I did with a different brand, on the parking lamps). I don't drive much at night, but I can say for sure when you flash the high beams at someone it burns the paint off their car.
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Junior Member
Joined: Jul 2007
Posts: 40
Likes: 0
From: Memphis,TN
W203, W208, X204
Thanks for all the assistance. I finally found a video on YouTube talking about the exact bulb that I want to change. I believe my wife's GLK350 is different than the upgraded model and her truck does not have Xenon bulbs but rather 2 different high and low beam halogen bulbs and this small bulb. Here's a video of the bulb I was referring to for anyone else ever looking.
Senior Member
Joined: Feb 2020
Posts: 491
Likes: 150
From: Lac Ste. Marie, Quebec
2006 Alfa Romeo Brera, 2010 GLK350, 2018 BMW 640i GT, 1997 Subaru SVX, 2012 Moto Guzzi Norge GT8V
Oh, that bulb. I changed mine last week. I got lucky and did it by feel. It was so easy I thought I had broken something.
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,928
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
Mine (2014) is not like that. My parking lamp is part of the high beam lamp (H15.) The little bulb is only the turn signal. It's on the end of a long stick.
Last edited by John CC; Jul 30, 2025 at 11:12 AM.
