2013 Lexus GS450h VSC

292
GS450h_U (OM30D01U)
4-5. Using the driving support systems
■Turning off both TRAC/VSC systems
To turn the TRAC/VSC systems
off, press and hold the button for
3 seconds and more while the
vehicle is stopped.
The VSC OFF indicator light will
come on and the “TRAC OFF” will
be shown on the multi-information
display.
Press the button again to turn the
systems back on.
GS450h_U.book Page 292 Monday, January 23, 2012 10:20 AM

GS450h_U (OM30D01U)
2934-5. Using the driving support systems
4
Driving
■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.
GS450h_U.book Page 293 Monday, January 23, 2012 10:20 AM

294
GS450h_U (OM30D01U)
4-5. Using the driving support systems
CAUTION
■The ABS does not operate effectively when
●Tires with inadequate gripping ability are used (such as excessively worn tires on
a snow covered road).
●The vehicle hydroplanes while driving at high speed on wet or slick roads.
■Stopping distance when the ABS is operating may exceed that of normal condi-
tions
The ABS is not designed to shorten the vehicle’s stopping distance. Always main-
tain a safe distance from the vehicle in front of you in the following situations:
●When driving on dirt, gravel or snow-covered roads
●When driving with tire chains
●When driving over bumps in the road
●When driving over roads with potholes or uneven surfaces
■TRAC may not operate effectively when
Directional control and power may not be achievable while driving on slippery
road surfaces, even if the TRAC system is operating.
Do not drive the vehicle in conditions where stability and power may be lost.
■When the VSC is activated
The slip indicator light flashes. Always drive carefully. Reckless driving may cause
an accident. Exercise particular care when the indicator light flashes.
■When the TRAC/VSC systems are turned off
Be especially careful and drive at a speed appropriate to the road conditions. As
these are the systems to help vehicle stability and driving force, do not turn the
TRAC/VSC systems off unless necessary.
GS450h_U.book Page 294 Monday, January 23, 2012 10:20 AM

GS450h_U (OM30D01U)
2954-5. Using the driving support systems
4
Driving
CAUTION
■Replacing tires
Make sure that all tires are of the specified size, brand, tread pattern and total load
capacity. In addition, make sure that the tires are inflated to the recommended tire
inflation pressure level.
The ABS, TRAC and VSC systems will not function correctly if different tires are
installed on the vehicle.
Contact your Lexus dealer for further information when replacing tires or wheels.
■Handling of tires and the suspension
Using tires with any kind of problem or modifying the suspension will affect the
driving assist systems, and may cause a system to malfunction.
GS450h_U.book Page 295 Monday, January 23, 2012 10:20 AM

300
GS450h_U (OM30D01U)
4-5. Using the driving support systems
■Conditions that may trigger the system even if there is no danger of a collision
●When there is an object by the roadside at the entrance to a curve
●When passing an oncoming vehicle on a curve
●When driving over a narrow iron bridge
●When there is a metal object on the road surface
●When driving on an uneven road surface
●When passing an oncoming vehicle on a left-turn
●When your vehicle rapidly closes on the vehicle in front
●When a grade separation/interchange, sign, billboard, or other structure appears
to be directly in the vehicle’s line of travel
●When climbing a steep hill causes an overhead billboard or other metallic structure
to appear directly in the vehicle’s line of travel
When the system is activated in the situations described above, there is also a possi-
bility that the seat belts will retract quickly and the brakes will be applied with a force
greater than normal. When the seat belt is locked in the retracted position, stop the
vehicle in a safe place, release the seat belt and refasten it.
■Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may also be
occasions when the sensor cannot detect pedestrians, animals, bicycles, motorcy-
cles, trees, or snowdrifts.
■Situations in which the pre-collision system does not function properly
The system may not function effectively in situations such as the following:
●On roads with sharp bends or uneven surfaces
●If a vehicle suddenly moves in front of your vehicle, such as at an intersection
●If a vehicle suddenly cuts in front of your vehicle, such as when overtaking
●In inclement weather such as heavy rain, fog, snow or sand storms
●When your vehicle is skidding such as the VSC system off
●When your vehicle is steeply inclined
GS450h_U.book Page 300 Monday, January 23, 2012 10:20 AM

7137-2. Steps to take in an emergency
GS450h_U (OM30D01U)
7
When trouble arises
(Flashes)
(If equipped)
Pre-collision system warning light Indicates a malfunction in the pre-collision system
The warning light will operate as follows, even when the system
is not malfunctioning:
• The light will flash quickly when the system is operating. (→ P. 2 9 6 )
• The light will turn on when the pre-collision system is dis- abled. ( →P. 2 9 7 )
• The light will flash when the system cannot temporarily be used. ( →P. 7 3 5 )
Slip indicator
Indicates a malfunction in:
• The VSC system; or
•The TRAC system
The light will flash when the VSC or the TRC system is operat-
ing.
(Flashes)
(If equipped)
“A F S O F F ” i n d i c a t o r Indicates a malfunction in the adaptive front-lighting system
(Flashes)
Brake hold operated indicatorIndicates a malfunction in the brake hold system
(Flashes)(U.S.A.)
(Flashes)
(Canada)
Parking brake indicator Indicates a malfunction in the parking brake system
Warning lightWarning light/Details
GS450h_U.book Page 713 Monday, January 23, 2012 10:20 AM

7607-2. Steps to take in an emergency
GS450h_U (OM30D01U)
CAUTION
■When using the compact spare tire
●Remember that the compact spare tire provided is specifically designed for use
with your vehicle. Do not use your compact spare tire on another vehicle.
●Do not use more than one compact spare tires simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting opera-
tions that cause sudden engine braking.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly:
• ABS & Brake assist
•VSC
•TRAC
•Cruise control
• Dynamic radar cruise control (if equipped)
• PCS (if equipped)
•EPS • AFS (if equipped)
•AVS
• LKA (Lane-Keeping Assist)
(if equipped)
• Rear view monitor system
• Intuitive parking assist (if equipped)
• Navigation system (if equipped)
GS450h_U.book Page 760 Monday, January 23, 2012 10:20 AM

855Alphabetical index
GS450h_U (OM30D01U)
Paddle shift switches ......................... 201
Parking brake switches...................207
PCS OFF switch ................................ 297
Power door lock switch ...................137
Power switch......................................... 189
Power window switches ................. 164
Rear sunshade switch ..................... 594
Rear window and outside rear view mirror defoggers
switch................................................... 384
Seat heater switches........................ 590
Seat ventilator switches ................... 591
Snow mode switch........................... 200
“SOS” button....................................... 607
Talk switch ............................................ 353
Telephone switches ......................... 507
Tilt and telescopic steering control switch ................. 158
Tire pressure warning reset switch................................................... 654
Trunk closer switch .............................142
Trunk opener switch ........................... 141
Trunk opener main switch...............142
Vehicle-to-vehicle distance button ...................................................239
VSC OFF switch ................................ 291
Window lock switch .......................... 164
Windshield wipers
and washer switch .......................... 219 Tachometer ..................................... 89, 104
Tail lights .................................................... 213
Light switch............................................. 213
Replacing light bulbs ....................... 697
Welcome light illumination
control......................................................121
Talk switch............................................... 353
Telephone switches............................. 507
Theft deterrent system
Alarm ............................................................ 81
Immobilizer system...............................79
Tire inflation pressure......................... 790 Maintenance data.............................. 790
Tire inflation pressure display function....................................................97
Warning light ......................................... 715
Warning message............................. 740
Tire information .....................................795 Glossary.................................................802
Size ........................................................... 798
Tire identification number ............. 797
Uniform Tire Quality Grading ............................................. 800
Tire pressure warning system ......... 653 Function ..................................................653
Initializing ............................................... 653
Installing tire pressure warning
valves and transmitters................653
Registering ID codes .......................655
Tire pressure warning reset switch ...................................................654
Warning light ......................................... 715
Warning message................... 740, 741T
GS450h_U.book Page 855 Monday, January 23, 2012 10:20 AM