the other day after starting up my truck my airbag light came on, and then my AC stop working right. It would just blow hot air out of whatever vents i had it on last, but i could still control the speed of it. Had a friend mention it might be fuse box(tipm) and after a lil messing with it the light would go off and AC would work right, atleast until i restarted truck again. i have a smarty and its pulling a code for PO541, which is for intake heater relay. im already getting parts for that but doubt that fixes my main problem. i dont wanna spend 500+ dollars on new fuse box plus whatever dealership robs me to reflash it, if i dont have to! just wanted to see if any body had any ideas first!