Geckoboy is correct about how to switch from READY mode to ACC(essory) mode without going through OFF. I posted this to a different thread on this Newsgroup a while ago. It was mentioned on the Toyota tag hanging from the gear-shift lever on delivery.

OmegaOmega, the only devices that run off the high-voltage NiMH battery are MG1 and MG2 (the motor-generators), the air-conditioning compressor, and the dc-to-dc converter that charges the 12-volt battery from the NiMH battery. That's the only way the 12-V battery gets charged, and the charging can only occur when the car is in READY mode. All other devices are powered by the 12-V battery. In ACC mode, the current drain from the 12-V battery (with all accessories off) is ~4.5 amperes, meaning that the 12-V battery would discharge in under 10 hours. In ON (but not READY) mode, the current drain is ~9.7 amperes, under which condition the 12-V battery would drain in under 5 hours. I posted these measurements in a different thread on this Newsgroup.

Stan