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The switch is a thermostat. The default setting for 1 indicator is about 95F, for 2 105F, for 3 about 115F. If you know where you prefer it then you could set it there to begin with. However, your clothing is insulation, especially if you have a heavy coat on, so what the thermostat inside the seat reads for temperature isn't going to be what you feel until after your clothing has sufficiently warmed. That's one reason why you probably want to go with the highest setting initially, turning it down once you've become comfortable. The other is the seat being the only heat source until the engine warms; after it does you may not need as much heat from the seat. Those factors explain why BMW has it go to setting 3 instead of 1 when you turn it on. Ever been to Bavaria in winter? It's not like they don't know what it is to be cold. OTOH I've got a bad back, which feels better with the seat hot most of the time.
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