I purchased a 2003 Avalanche with 53 K miles a week ago. The power seats and seat heaters worked fine. Yesterday the drivers side seat quit working as did both sides seat heaters (just when I was showing off the new toys to my wife). I looked franticly for a fuse that controls them. I found one IGN3 that says ignition, heated mirrors. It is 10 amp and is fine. The only related thing I could find for the power seat was "CB Seat". According to the book it is a circuit breaker and it controls both front power seats. Because the passenger seat works fine still I assume it is not that. I was told it may be the "module" but would like input before I dive into something.