Lexus 2013 IS250, Owner'S Manual

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4-5. Using the driving support systems
4
Driv
in
g
IS250_EE(OM53B11E)

When the battery is disconnected
The steering wheel may move from its straight forward position, but this will be
corrected automatically when driving.

Sounds and vibrations caused by the ABS, brake assist, TRC, VSC and hill-start
assist control systems

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 systems.

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.

EPS operation sound
When the steering wheel is operated, a motor sound may be heard. This does not
indicate a malfunction.

Reactivation of the TRC/VSC systems
Even after the TRC/VSC systems have been turned off, turning the engine off
and then on again will automatically reactivate the TRC/VSC systems.

Reactivation of the TRC system linked to vehicle speed
When only the TRC system is turned off, the TRC system will turn on when
vehicle speed increases. However, when both TRC and 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 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 engine off. The EPS sys-
tem should return to normal within 10 minutes.