Passenger Bi-Xenon Keeps Failing
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Newbie
Joined: Aug 2025
Posts: 14
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2012 E63
Passenger Bi-Xenon Keeps Failing
Hey all, got a "Check right low beam" on my dash, checked to confirm the light was out. Ordered 2 new lights and replaced both sides. Confirmed passenger side was working again, took a quick drive to warm up my new oil and got the same error on my dash and noticed the passenger light was out again.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
Super Member
Joined: Oct 2013
Posts: 745
Likes: 139
14 E63, 05 E55, 03 Evo 8, 08 F250, 06 R6R, 92 Talon TSI, and instability
Hey all, got a "Check right low beam" on my dash, checked to confirm the light was out. Ordered 2 new lights and replaced both sides. Confirmed passenger side was working again, took a quick drive to warm up my new oil and got the same error on my dash and noticed the passenger light was out again.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
Yes, You'll have to pull the bumper and remove the lights to get to the ballasts. All things considered, you'll probably have to go that deep to rule out everything else anyway that could be the cause.
Out Of Control!!
Joined: Apr 2019
Posts: 11,932
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Hey all, got a "Check right low beam" on my dash, checked to confirm the light was out. Ordered 2 new lights and replaced both sides. Confirmed passenger side was working again, took a quick drive to warm up my new oil and got the same error on my dash and noticed the passenger light was out again.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
Did some looking around on here and online and it seems like it could be the ballast, the ballast connector, or a bad wire / failing shielding. I did a visual inspection inside the light housing and everything looked in good condition. Hoping I don't need to pull the bumper to check/swap the ballast, was wondering if anyone had any ideas on what else it could possibly be or some easier things I might be able to check first.
If you want a quick tip is to use your MB scanner yo interact with your light control.
I am not exactly familiar with your HID ballast, it may be controlled by F-SAM or provide its own networking.
See what module records the fault... its the one that detects it. It may help confirm suspicions...
Headlight ballast modules don't care for soaking HID or LED... if you see evidence of that get a new pair.
Soaked MB electronics feature unprotected circuits: replace!
