2013 Lexus GS 450h Owners Manual - Page 269

GS450h_U (OM30D01U)

293

4-5. Using the driving support systems

4

■

When the message is displayed on the multi-information display showing that

TRAC has been disabled even if the VSC OFF switch has not been pressed

TRAC cannot be operated. Contact your Lexus dealer.

■

Sounds and vibrations caused by the ABS, brake assist, VSC and TRAC 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 after the vehicle comes to a stop.

■

EPS operation sound

When the steering wheel is operated, a motor sound (whirring sound) may be heard.

This does not indicate a malfunction.

■

Reactivation of the TRAC/VSC systems

Even after the TRAC/VSC systems have been turned off, turning the hybrid system

off and then on again will automatically reactivate the TRAC/VSC systems.

■

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/VSC systems are turned off, the

systems will not turn on even when vehicle speed increases.

■

Reduced effectiveness of the EPS system

The effectiveness of the EPS system is reduced to prevent the system from overheat-

ing when there is frequent steering input over an extended period of time. The steer-

ing 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 effectiveness

will improve after a short while.

*

: If the LKA (Lane-Keeping Assist) system cannot operate in this case, a warning

message will be shown on the multi-information display.