[Toyboy]

The air inlet is located inside of the cabin on the previous Prius too.
It is on the rear shelf just behind the rear seat.

It will cause over heat of the battery if you block the air inlet.
The Battery ECU will detect the over heat of the battery, then
the output power will be reduced.
http://www.peve.panasonic.co.jp/catalog/e_bms.html

Will a sensor go off?