I already answered your cross-post on the australian-prius yahoogroup
But my guess is that it is the solar gain sensor that is part of the
climate control system. (If you have the sun beating down on you,
you'd feel warmer than the temperature in the car, so the climate
control using fuzzy logic will compensate...)
You apparently missed my post earlier in this thread. That is the
light sensor for the climate control system. It uses some fuzzy logic
to decide how much heating/cooling you need, based on how strongly the
sun is beating down on you. (For example, the noonday sun will make
you feel warmer than it really is, so the AC will have to cool more to
make you feel like it's the temp you selected.)
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