I have searched to the best of my ability, and tried every combination on a Gen 1. Is it correct that the Maintenance Mode menu for, says, checking 12V battery voltage is a Gen 2 only feature? Could it be it requires the parking/emergency brake? I noticed I could not disable the DRL with the e-brake, so there might be a switch issue because I know the switch goes straight to the DRL relay in the Gen 1 wiring diagram.
Thanks, I thought I had seen Gen 1 pics but I searched for a long time and couldn't be certain. For future reference, here is the Gen 1 maintenance mode: Toyota Prius Controls
FINALLY!!! I have been searching for this info since February and until now, I haven't gotten it to work!!! Thank you, Thank you, Thank you, Thank you!!!!!!!!!!!!!!