2008 Toyota Prius Owners Manual - Page 360
2008 Toyota Prius Manual
Page 360 highlights
3 -7 . Ot he r int e rior fe a t ure s Pow e r out le t The power outlet can be used for 12V accessories that run on less than 10A. Instrument panel Rear console box n The power outlet can be used when The "POWER" switch is in ACCESSORY or ON mode. 332 PRIUS_U_(L/O_0802)