Left low beam out, bulb good
Thread Starter
Newbie
Joined: Aug 2013
Posts: 3
Likes: 0
Mercedes C300
Left low beam out, bulb good
After getting a warning message to check my left low beam headlight on my 2008 C300 (USA model) and seeing that it was out, I turned the headlamp selector switch back and forth, no change. I pulled out the lamp- stock halogen H7 (and there wasn't a wire retainer like on the right, but whatever) and it was good. I checked it with an ohmmeter (ok- low resistance) and with jumpers to the battery (it lit).
After struggling with finding a fuse diagram (in the trunk toolkit of all places!!) I see fuses 28 and 29 labeled headlight range adjustment, 10 amps. I pull both while the right low beam was lit. It stayed lit. No other fuse relates to headlights.
So what is going on here? A previous cryptic post says that there are no fuses, headlamps are computer controlled. What does this mean, is it true and how do you fix it?
David
After struggling with finding a fuse diagram (in the trunk toolkit of all places!!) I see fuses 28 and 29 labeled headlight range adjustment, 10 amps. I pull both while the right low beam was lit. It stayed lit. No other fuse relates to headlights.
So what is going on here? A previous cryptic post says that there are no fuses, headlamps are computer controlled. What does this mean, is it true and how do you fix it?
David
Last edited by djmarchand; Aug 22, 2013 at 02:59 PM.
MBWorld Fanatic!
Joined: Apr 2013
Posts: 1,130
Likes: 101
From: Belgium
W205
check if you have voltage first.
if you don't check fuse F29 or F30 depending (10A fuses) and should be located at the bottom right of the fusebox if you stand in front of your car.
atleast with mine its like that but i've seen fuseboxes with a complete different settup
when i have a fuse blown i always check all of them just in case
if you don't check fuse F29 or F30 depending (10A fuses) and should be located at the bottom right of the fusebox if you stand in front of your car.
atleast with mine its like that but i've seen fuseboxes with a complete different settup
when i have a fuse blown i always check all of them just in case
Last edited by Doa; Aug 22, 2013 at 03:36 PM.
MBWorld Fanatic!
Joined: Apr 2013
Posts: 1,130
Likes: 101
From: Belgium
W205
if i follow my list,
28 should be a 7.5A fuse from the kombiinstrument
29, 30, 31 & 32 are related to the headlights.
but i've noticed some W204 have a complete different fuse setting so i'd check all 10 & 15A fuses
28 should be a 7.5A fuse from the kombiinstrument
29, 30, 31 & 32 are related to the headlights.
but i've noticed some W204 have a complete different fuse setting so i'd check all 10 & 15A fuses
Thread Starter
Newbie
Joined: Aug 2013
Posts: 3
Likes: 0
Mercedes C300
What is the front sam? What you describe is a fuse box aft of the brake fluid reservoir. I assume that it is a combination fuse box and microprocessor control module. My googling tells me everyone, and I mean everyone refers to it as a SAM. I am curious what SAM stands for.
BTW I misstated the numbering of the two 10 amp fuses in this box labeled headlight range adjustment. They are actually 29 and 30.
In any case is this mysterious sam user repairable?
As a 66 YO shade tree mechanic in his teenage years who started with points, plugs, condensers, relays and solenoids and moved on to program microprocessors in machine code, I am shocked that something as simple and critical as headlamps can be waylaid by a microprocessor module. But hey, maybe that is progress ;-).
David
BTW I misstated the numbering of the two 10 amp fuses in this box labeled headlight range adjustment. They are actually 29 and 30.
In any case is this mysterious sam user repairable?
As a 66 YO shade tree mechanic in his teenage years who started with points, plugs, condensers, relays and solenoids and moved on to program microprocessors in machine code, I am shocked that something as simple and critical as headlamps can be waylaid by a microprocessor module. But hey, maybe that is progress ;-).
David
Last edited by djmarchand; Aug 23, 2013 at 01:14 PM.
Trending Topics
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
As a 66 YO shade tree mechanic in his teenage years who started with points, plugs, condensers, relays and solenoids and moved on to program microprocessors in machine code, I am shocked that something as simple and critical as headlamps can be waylaid by a microprocessor module. But hey, maybe that is progress ;-).
David
David
Any voltage at the headlight bulb contacts with your multi meter ? .
Take a good look at the contacts on the bulb & bulb holder for damage .Give both a little polish with a piece of fine emery paper. Make sure contact spring is not broken if there is one.
This might help https://mbworld.org/forums/c-class-w...sam-whats.html
Last edited by Carsy; Aug 23, 2013 at 07:20 PM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Senior Member
Joined: Feb 2008
Posts: 300
Likes: 2
From: Toronto
2008 c300
[QUOTE=. I am curious what SAM stands for.
David[/QUOTE]
Signal Acquisition and Actuation Module.
Its not the fusebox, and is nastily expensive!
MB seem to have weird fusing - tons of fuses for this that and the other, but only one for the entire HVAC and none for the headlamps.
Good luck I hope you find a cheap solution
David[/QUOTE]
Signal Acquisition and Actuation Module.
Its not the fusebox, and is nastily expensive!
MB seem to have weird fusing - tons of fuses for this that and the other, but only one for the entire HVAC and none for the headlamps.
Good luck I hope you find a cheap solution
Newbie
Joined: Mar 2014
Posts: 1
Likes: 0
Mercedes c300
Any luck??!
Same problem in a c300 today. I took it to a pep boys to change 4 tires and when i dropped it off, all lights were operational. When i got the car back, they had changed the lights from Automatic (A) to off (o) on the light selector. I turned them back on when i left and of course i get a "check lower right beam." I thought it was a weird coincidence that my bulb goes out the same day of replacing tires, however, my bluetooth phone didn't pair back up. So I drove back to the shop and they told me i needed a new bulb. I had the guy put the new H7 bulb, and it didn't work. Any chance that something was changed or tweaked in the electronics. I know there are pressure sensors in the tires that they may have reset?
Did you ever get this fixed?
Did you ever get this fixed?
Newbie
Joined: Jul 2014
Posts: 2
Likes: 1
From: Japan
2010 C200 wagon
Wrong light?
Many people make this same mistake of working on the wrong light. Hi-beams are upper and closer to the center of the car, while the low-beams are lower and further out. My low-beams have a clip, my hi-beams don't.
Newbie
Joined: Sep 2017
Posts: 1
Likes: 0
2002 s-500
Same issues
I am having the same issues. I took my car to shop and they charged me 527.00 to replace the front two low been bulbs and for doing diagnostic which they couldn't figure out what was wrong. My lights were flickering off and on and so they said alternator needed replaced. I am in over $2200 in repair bills and still my lights are malfunctioning. I also changed my blinker bulbs a week ago and it is out again. Any advice would be nice. I have a print out of all the codes.
Newbie
Joined: Dec 2017
Posts: 2
Likes: 0
C300
Same problem in a c300 today. I took it to a pep boys to change 4 tires and when i dropped it off, all lights were operational. When i got the car back, they had changed the lights from Automatic (A) to off (o) on the light selector. I turned them back on when i left and of course i get a "check lower right beam." I thought it was a weird coincidence that my bulb goes out the same day of replacing tires, however, my bluetooth phone didn't pair back up. So I drove back to the shop and they told me i needed a new bulb. I had the guy put the new H7 bulb, and it didn't work. Any chance that something was changed or tweaked in the electronics. I know there are pressure sensors in the tires that they may have reset?
Did you ever get this fixed?
Did you ever get this fixed?
I'm experiencing the same problem on my C300. My Bluetooth isn't connecting and my right low beam warning message has popped up. Have you had a solution for this problem by any chance?
Newbie
Joined: Sep 2018
Posts: 1
Likes: 0
2010 c300 Sport
Thank you. That was it for me. Just by glancing at it, it seemed like it was the other way around. Thanks for your help!
Newbie
Joined: Mar 2019
Posts: 1
Likes: 0
2010 Mercedes c300
Question
I am having the same issues. I took my car to shop and they charged me 527.00 to replace the front two low been bulbs and for doing diagnostic which they couldn't figure out what was wrong. My lights were flickering off and on and so they said alternator needed replaced. I am in over $2200 in repair bills and still my lights are malfunctioning. I also changed my blinker bulbs a week ago and it is out again. Any advice would be nice. I have a print out of all the codes.
Newbie
Joined: Jun 2019
Posts: 1
Likes: 0
gl450
