I have an unpaid red light ticket, its several months past due and I havent heard anything from the courts?!?!

I live in California. Several months ago I received a ticket in the mail with my picture, apparently a camera took my picture crossing a red light at an intersection. $400 dollar fine. Never paid it. Several months later I haven't heard anything and I'm scared, could there be a warrant out for my arrest? I wanna take care of it now, but don't wanna show up at the courthouse to pay my fine and have them arrest me!! Comon I'm not even a bad guy, I just made a mistake, how could they arrest me!?!? LOL but seriously, what should/can I do about this?