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Main beam wont stay on

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C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Main beam wont stay on

 
Old 03-17-2019, 10:11 AM
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W124 300E 1991
Main beam wont stay on

Hello!
My 2006 Sport edition 200CDI W203 has bi-xenon headlights and a day after i changed my head unit my headlights stopped working (not sure if this has anything to do with it).
I changed back to the original head unit but the problem persists.

When i turn on the main beams, they stay on for a couple of seconds before they turn off again by themselves, but the blue main beam indicator stays on. If i leave them on they turn themselves on again after a while but then just as quickly off again as before. I also get a message in my display saying left main beam fault & right main beam fault.

Any ideas on why? May it be a fault code stored that i need to delete before it works again after i changed the head unit back?
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