Can accessory mode be disabled?

Hi all, sorry for the x-post but it occurred to me that this probably belongs in Technical discussions...

Hey Priiheads - new owner of a used 2010 here, and for the life of me I cannot get the car into accessory mode. It should be simple, press the power button without your foot on the brake, right? but no... it just doesn't do anything.

But here's the thing - the car is a former rental (Zipcar), and I wonder if they somehow disabled accessory mode to avoid dead-battery issues?

The other (less appealing) possibility is that they broke it accidentally somehow while wiring up their magical gizmo that allowed Zipcard holders into the car with no key... but that doesn't make as much sense to me.

Any ideas?

Read more: http://priuschat.com/threads/can-accessory-mode-be-disabled.115269/#ixzz26wOHWrr2
Can accessory mode be disabled? | PriusChat