2010 Lexus RX 450h User Guide - Page 257

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2-4. Using other driving systems

2

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Sounds and vibrations caused by the ABS, VSC, TRAC and brake assist

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A sound may be heard from the engine compartment 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.

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Any of the following conditions may occur when the above systems are operat-

ing. 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.

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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.

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Reactivation of the TRAC /VSC systems

Turning off the hybrid system after turning off the TRAC/VSC systems will automat-

ically reactivate them.

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Reactivation of the TRAC system linked to vehicle speed

When only the TRAC system is turned off, the TRAC system will turn on when vehi-

cle speed increases. However, when both TRAC and VSC systems are turned off,

the systems will not turn on even 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 over-

heating 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 normal within 10 minutes.

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If the slip indicator comes on

It may indicate a malfunction in the VSC or TRC function.

Contact your Lexus dealer.