Toyota Yaris HV 2017 Manual page 306

306
4-6. Using the driving support systems
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Sounds and vibrations caused by the ABS, brake assist, VSC, TRC and
hill-start assist control systems
●
A sound may be heard from the engine compartment when the brake pedal
is depressed repeatedly, when the hybrid system is started or just after the
vehicle begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
●
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 also after the vehicle comes to a stop.
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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 one or two min-
utes passed after the stop of the hybrid system.
■
EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
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Automatic reactivation of TRC and VSC systems
After turning the TRC and VSC systems off, the systems will be automatically
re-enabled in the following situations:
● When the power switch is turned off
●
If only the TRC system is turned off, the TRC will turn on when vehicle
speed increases
If both the TRC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases.
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