I've had my 2009 Prius II for about a year now and I have NEVER been able to turn on the accessory mode. I followed the manual and put the smart key in the slot and pushed the power button while keeping my foot off of the brake pedal but I get NO RESPONSE. I tried holding the power button down, pushing it just once, and pushing it repeatedly. I've successfully engaged accessory mode on a similar interface before (on a hybrid Highlander) with no problem. Any ideas?
If it is any consolation, the 12 volt battery is so small, you should not run Accessories off it anyway. I always use Ready in P.
