One reported alternate sequence to get to the Maintenance screen is a sequence of screen touches:
"Push DISPLAY and then instead of Upperleft, Downleft,Upperleft, Downleft,Upperleft, Downleft try Upperleft, Upperright, Upperleft, Upperright, Upperleft, Upperright."
Report your results back here.
Jeff,
On my 2007 Prius, the Info + cycle-headlights method fails to enter maintenance mode. The display does reboot, but it returns to the normal display rather than to the maintenance menu. On the other hand, the Display + touch-sequence method does work, using the sequence UL-UR-UL-UR-UL-UR. Thanks.
(BTW, this reveals my battery voltage to be only 9.6 V, presumably explaining recent failures to start. Is three years a normal time to failure for the auxiliary battery?)