Lexus IS 300 2019, Owner'S Manual

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4-5. Using the driving support systems
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IS350_300_GE
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Sounds and vibrations caused by the ABS, brake assist, VSC, TRC, hill-start assist con-
trol and VGRS systems
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A sound may be heard from the engine compartment when the brake pedal is
depressed repeatedly, when the engine is started or just after the vehicle begins to
move. This sound does not indicate that a malfunction has occurred in any of these sys-
tems.
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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.
• 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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EPS and VGRS 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:
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When the engine switch is turned off
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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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Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from overheating
when there is frequent steering input over an extended period of time. The steering
wheel may feel heavy as a result. Should this occur, refrain from excessive steering input
or stop the vehicle and turn the engine off. The EPS system should return to normal
within 10 minutes.
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Operating conditions of emergency brake signal
When the following three conditions are met, the emergency brake signal will operate:
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The emergency flashers are off
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Actual vehicle speed is over 55 km/h (35 mph)
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The brake pedal is depressed in a manner that cause the system to judge from the vehi-
cle deceleration that this is a sudden braking operation
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Automatic system cancelation of emergency brake signal
The emergency brake signal will turn off in any of the following situations:
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The emergency flashers are turned on
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The brake pedal is released
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The system judges from the vehicle deceleration that is not a sudden braking operation
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