My 2001 Dodge Ram 3500 van airbag light came on when I pulled out of my parking spot this morning. It wasn't on when I parked last night. I've checked with a cheap code reader and it says NO CODES, that is none registering trouble. I've pulled the negative battery cable for 30 minutes and replaced it, still air bag light on. I've pulled the fuses and they're fine. Haven't checked connections yet. I'm fearing clock-spring trouble. How tough is that to replace myself? Ideas?