Hello My name is Rick and i own a 14 is250 f sport. Ive been having a issue with the DRL and hopefully i can get some answers. During the day both of them seem to stay on with no issue, but once night time comes around only my passenger side stays on. Does anyone know what is causing this? Thank you





This would be during the day





And this is during the night and also when i unlock my car

 

has your bumper been removed before? does "parking light" light up in driver side headlight also?

I think you probably want to take it to dealer to have them look at it and warranty that one side.

might be issue internally with that one lens.

The DRL lens has 3-4 wires going to it and when "parking lights" come on, they dim them down to 50% brightness instead of 100% brightness when being used as DRL.
does not sound like a loose connector since the DRL 100% works fine