Mazda mx5 Owner's Manual page 23

Essential Safety Equipment
Seats
NOTE
If the ignition is switched off while
the seat warmer is operating (High,
Mid or Low) and then switched
ON again, the seat warmer will
automatically operate at the
temperature set before switching off
the ignition.
Use the seat warmer when the engine
is running. Leaving the seat warmer
on for long periods with the engine
not running could cause the battery
power to be depleted.
The temperature of the seat warmer
cannot be adjusted beyond High, Mid
and Low because the seat warmer is
controlled by a thermostat.
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