2003 Toyota Prius Owners Manual - Page 111

Ignition switch with steering lock51. This is the normal driving position. "ACC"-Accessories such as the radio operate, but the hybrid system is off. If you leave your key in the "ACC" position for a while, put the running mode selector lever in "P" position. If you leave the key in the "ACC" or "LOCK" position and open the driver's door, a buzzer will remind you to remove the key. "LOCK"-The hybrid system is off and the steering wheel is locked. The key can be removed only at this position. You must push in the key to turn it from "ACC" to the "LOCK" position. The selector lever must be put in the "P" position before pushing the key. Vehicles with hybrid vehicle immobiliser system-Once you remove the key, the hybrid vehicle immobiliser system is automatically set. (See "Hybrid vehicle immobiliser system" on page 20 in Section 2-1.) When starting the hybrid system, the key may seem stuck at the "LOCK" position. To free it, first be sure the key is pushed all the way in, and then rock the steering wheel slightly while turning the key gently. NOTICE Do not leave the key in the "ACC" or "ON" position for a long time when the hybrid system is off. The auxiliary battery will discharge. 25p001c "START"-The hybrid system is ready to operate. Turn the key to the "START" position and hold the ignition switch at this position for about a few seconds until the "READY" light comes on and a beep sounds. (If the ambient temperature is low such as during winter conditions, it may take time until the "READY" light is on." The key will return to the "ON" position when released. Being different from ordinary vehicles, you cannot start your vehicle with the running mode selector lever in "N" position. "ON"-The hybrid system starts to run when the accelerator pedal is depressed with the "READY" light and all accessories on. 104