I had the same problem when I upgraded the headlights on my 2005 IC RE-300. The headlights are also used as Daytime Running Lights (DRL). I think the DRL signal was incompatible with LED headlights, but was just fine for the halogen bulbs. On my bus, there was a DRL module located behind the steering column under the dash. I disconnected the module. This disabled my DRLs, but my headlights work properly. correctly.
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