Toyota 2016 Prius Service Manual page 407

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Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC and
hill-start assist control systems
Any of the following conditions may occur when the above systems are oper-
ating. 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 also after the vehicle comes to a stop.
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The brake pedal may pulsate slightly after the ABS is activated.
● The brake pedal may move down slightly after the ABS is activated.
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ECB operating sound
ECB operating sound may be heard in the following cases, but it does not
indicate that a malfunction has occurred.
●
Operating sound heard from the engine compartment when the brake pedal
is operated.
●
Motor sound of the brake system heard from the front part of the vehicle
when the driver's door is opened.
●
Operating sound heard from the engine compartment when 1 or 2 minutes
passed after the stop of the hybrid system.
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EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
PRIUS_OM_OM47A29U_(U)
4-5. Using the driving support systems
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