Hello I have a question. When I turn my car on the passenger head light comes on, but when i start driving it goes out the low beam.

 

Welcome to ClubLexus bigl553! You didn't specify in your post, but I'm guessing your question is in regards to the 07 LS460 in your profile. I'm going to go ahead and move this thread to the 4LS forum, where you're more likely to get help.

 

Time to replace your bulb.