2011 Toyota Prius Owners Manual - Page 280

2-4. Using other driving systems When the Enhanced VSC/TRAC is operating If the vehicle is in danger of slipping or if the front wheels spin, the slip indicator light flashes to indicate that the Enhanced VSC/ TRAC have been engaged. A buzzer (intermittent) sounds to indicate that Enhanced VSC is operating. ITO24P109 n Sounds and vibrations caused by the ABS, brake assist, TRAC and Enhanced VSC l A sound may be heard from the engine compartment when the hybrid system is started, just after the vehicle begins to move, if the brake pedal is depressed forcefully or repeatedly, or 1 - 2 minutes after the hybrid system is stopped. This sound does not indicate that a malfunction has occurred in any of these systems. l Any of the following conditions may occur when the above systems are operating. None of these indicates that a malfunction has occurred Vibrations may be felt through the vehicle body and steering. A motor sound may be heard after the vehicle comes to a stop. The brake pedal may pulsate slightly after the ABS is activated. The brake pedal may move down slightly after the ABS is activated. n EPS operation sound When the steering wheel operates, a motor sound (whirring sound) may be heard. This does not indicate a malfunction. 254 PRIUS_U (OM47685U) DVD