Driver seat heater

[adamw89_2000]

Ok got a problem with my driver side seat heater. I've figure out that when I turn my seat heat on when I start the truck up, works fine. I turn the truck off to run in store or whatever, come back out start truck up and turn seat heat on again and the button does nothing. Won't light up or anything. If I immediYly turn the truck off, then start, then push button again it works! It only works every other time the truck is running? Any clues?