I have a 2003 LT Suburban, all of a sudden as soon as you turn the truck on the driver side heated seat turns on by itself, then it goes from high to medium to low and then stars all over again, all on its own!!! What the heck?!! If we turn it off manually it stays off for like a few minutes and then starts again.
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Yeah, it would be a relay, not a fuse. The symptoms you describe sounds like the computer controlling a timer is confused. Mine has recently started to not heat the seat, just the back, If I turn the back on, its works great, if I turn the bottom and back, it clicks off after about 30 seconds.