abs light

I have a red abs light on in my 2001 freightliner century.. Trying to pinpoint if it is a fuse or a sensor. When i turn the key to position 1 i hear all the valves clicking so the check is there.. but the light stays on during position 1 and continues to stay on when engine is on. Can i reset it with a magnet or do i need a computer reset?

 

o ok.. I havent even started the truck on a route yet since its my first truck.. I replaced the rear brakes but we have an inhouse mechanic and he doesnt have a cpu so im trying to avoid the $150 dollars to have it checked out and was thinking about just making my first trip and making money to then do it.. Hopefully d.o.t wont be so picky but I know how they are