It's the thing you start looking down at nervously when you see the highway patrol in your rearview mirror.

 

I meant a circuit board or something like that. I have changed the fuse..

 

So maybe you want to start your own topic, instead of hijacking somebody else's. Maybe you want to describe the problems you have and the vehicle you drive. What do you plan to do with the "circuit board or something" when you find it?