It depends on the size of the wiring and the fusing. I can't remember the specs but you can find them in the FSM (I want to say 15A (~135W with some safety factor) but not sure). The OEM switches should be able to handle just about any pad - if not, install an interposing relay(s).
Edit: Electrically, the pads are just resistors (ie, no fancy wiring), so the only thing you have to worry about is the current carrying capacity of the wires/switches.
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