Acura 2009 TL Owner's Manual page 197

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Seat Heaters
In the HI setting, the heater turns off
when the seat gets warm, and turns
back on after the seat's temperature
drops.
In the LO setting, the heater runs
continuously. It does not cycle with
temperature changes.
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Follow these precautions whenever
you use the seat heaters:
Use the HI setting only to heat the
seats quickly, because it draws
large amounts of current from the
battery.
If the engine is left idling for an
extended period, do not use the
seat heaters even on the LO
setting. It can weaken the battery,
causing hard starting.
2009 TL