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The way the circuit is designed, you could have a light on the switch but no heat if the power circuit and switch ground were OK but the heater element circuit was open, or no light and no heat, which would be a bad power circuit (this includes the fuse).
I don't know how used car warranties go in AUS, but if it's been a week, you probably have a recourse. don't mess with it and bring it to them. Replacing a seat heater yourself isn't necessarily hard, but it's a pain in the butt.
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