2011 Toyota Prius Owners Manual - Page 195

2-1. Driving procedures n Note for the entry function →P. 50, 59 n Leak detection pump Several hours after the engine is turned off, you may hear a sound coming from underneath the luggage compartment for several minutes. This is normal operation and does not indicate a malfunction. CAUTION n When starting the hybrid system 2 When driving Always start the hybrid system while sitting in the driver's seat. Do not press the accelerator pedal while starting the hybrid system under any circumstances. Doing so may cause an accident resulting in death or serious injury. n Stopping the hybrid system in an emergency If you want to stop the hybrid system in an emergency while driving the vehicle, push and hold the "POWER" switch for more than 3 seconds. However, do not touch the "POWER" switch while driving except in an emergency. Turning the hybrid system off while driving will not cause loss of steering or braking control, but the power assist to these systems will be lost. This will make it more difficult to steer and brake, so you should pull over and stop the vehicle as soon as it is safe to do so. NOTICE n To prevent 12 volt battery discharge Do not leave the "POWER" switch in ACCESSORY or ON mode for long periods if the hybrid system is not operating. n When starting the hybrid system If the hybrid system becomes difficult to start or stalls frequently, have the 12 volt battery and electronic key battery checked immediately. 169 PRIUS_U (OM47685U) DVD