Ecb Operating Sound; Eps Operation Sound; Automatic Reactivation Of Trac And Vsc Systems; Reduced Effectiveness Of The Eps System - Lexus RX 450H Owner's Manual

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4-5. Using the driving support systems

ECB operating sound

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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 oper-
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ated.
Motor sound of the brake system heard from the front part of the vehicle when the
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driver's door is opened.
Operating sound heard from the engine compartment when one or two minutes
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passed after the stop of the hybrid system.

EPS operation sound

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When the steering wheel is operated, a motor sound (whirring sound) may be heard.
This does not indicate a malfunction.

Automatic reactivation of TRAC and VSC systems

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After turning the TRAC and VSC systems off, the systems will be automatically
re-enabled in the following situations:
When the power switch is turned off
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If only the TRAC system is turned off, the TRAC will turn on when vehicle speed
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increases
If both the TRAC and VSC systems are turned off, automatic re-enabling will not
occur when vehicle speed increases.

Reduced effectiveness of the EPS system

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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 hybrid system off. The EPS system should return to nor-
mal within 10 minutes.
WARNING
The ABS does not operate effectively when
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The limits of tire gripping performance have been exceeded (such as excessively
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worn tires on a snow covered road).
The vehicle hydroplanes while driving at high speed on wet or slick roads.
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Stopping distance when the ABS is operating may exceed that of normal conditions
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The ABS is not designed to shorten the vehicle's stopping distance. Always maintain a
safe distance from the vehicle in front of you, especially in the following situations:
When driving on dirt, gravel or snow-covered roads
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When driving with tire chains
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When driving over bumps in the road
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When driving over roads with potholes or uneven surfaces
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TRAC/VSC may not operate effectively when
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Directional control and power may not be achievable while driving on slippery road
surfaces, even if the TRAC/VSC system is operating. Drive the vehicle carefully in con-
ditions where stability and power may be lost.
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