2011 Toyota Prius Owners Manual - Page 568

5 -2 . St e ps t o t a k e in a n e m e rge nc y I f t he hybrid syst e m w ill not st a r t If the hybrid system still does not start after following the correct starting procedure (→P. 164), confirm the following points. n The hybrid system will not start even if you are carrying the correct key. One of the following may be the cause of the problem. l There may not be sufficient fuel in the vehicle's tank. Refuel the vehicle. l The electronic key battery may be discharged. (→P. 549) l The hybrid system may be malfunctioning due to an electrical problem such as an open circuit or a blown fuse. However, depending on the type of malfunction, an interim measure is available to start the hybrid system. (→P. 547) l There may be a malfunction in the P position control system. (→P. 168, 519) l There may be a malfunction in the immobilizer system. (→P. 110) n The interior lights and headlights are dim, or the horn does not sound or sounds at a low volume. One of the following may be the cause of the problem. l The 12 volt battery may be discharged. (→P. 551) l The 12 volt battery terminal connections may be loose or corroded. 546 PRIUS_U (OM47685U) DVD