vsc LEXUS RX400H 2008 Owners Manual

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2-4. Using other driving systems
RX400h_U
■Fine adjustment of the set speed
Adjustment of the set speed by approximately 1.0 mph (1.6 km/h) cab be made by
lightly pressing the lever up or down and releasing it.
■Cruise control can be set when
●The shift lever is in the D.
●Vehicle speed is between approximately 25 mph (40 km/h) and 125 mph (200
km/h).
■Accelerating
The vehicle can be accelerated normally.
■Automatic cruise control cancellation
The set speed is automatically cancelled in any of the following situations.
●Actual vehicle speed falls more than 10 mph (16 km/h) below the preset vehicle
speed.
At this time, the memorized set speed is not retained.
●Actual vehicle speed is below 25 mph (40km/h).
●VSC is activated.
■Canceling and resuming regular acceleration
Cancel
Push the lever towards you to
cancel cruise control.
The speed setting is also can-
celed when the brakes are
applied.
Resume
To resume cruise control and
return to the set speed, push the
lever up.

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2-4. Using other driving systems
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When driving
RX400h_U
■Automatically canceling vehicle-to-vehicle distance control
Vehicle-to-vehicle distance control driving is automatically canceled in the follow-
ing situations.
●Vehicle speed falls below 25 mph (40 km/h)
●VSC is activated
●The sensor cannot operate correctly because it is covered in some way.*
●The windshield wipers are operating at high or low speed.*
*
: Vehicle-to-vehicle distance control driving must be reset by turning the ON-OFF button on again.
If vehicle-to-vehicle distance control driving is automatically canceled for any other
reason, there may be a malfunction in the system. Contact your Lexus dealer.
■Automatically cancelling constant speed control
The set speed is automatically canceled in the following situations.
●Actual vehicle speed is more than 10 mph (16 km/h) below the preset vehicle
speed
At this time, the memorized set speed is not retained.
●Vehicle speed falls below 25 mph (40 km/h)
●VSC is activated

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2-4. Using other driving systems
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When driving
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Driving assist systems
To help enhance driving safety and performance, the following systems
operate automatically in response to various driving situations. Be aware,
however, that these systems are supplementary and should not be relied
upon too heavily when operating the vehicle.
■ ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface.
■Brake assist
Generates an increased level of braking force after the brake pedal is
depressed, when the system detects a panic stop situation.
■VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces.
■Traction Control
Maintains drive power and prevents the front wheels (2WD models) or all
wheels (AWD models) from spinning wh en starting the vehicle or acceler-
ating on slippery roads.
■ EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn
the steering wheel.
■VDIM (Vehicle Dynamics Integrated Management)
Provides integrated control of the ABS, brake assist, VSC, traction control
and EPS systems.
Maintains vehicle stability when swerving on slippery road surfaces by
controlling the brakes, engine output, and the movement of the front
wheels.

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2-4. Using other driving systems
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When the VSC/traction control are operatingIf the vehicle is in danger of slip-
ping, or if the front wheels (2WD
models) or all wheels (AWD mod-
els) spin, the slip indicator light
flashes to indicate that the VSC/
traction control have been
engaged.
A buzzer (intermittent) sounds to
indicate that VSC is operating.
■Sounds and vibrations caused by the ABS, brake assist, VSC and traction control
●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.
●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.
■Reduced effectiveness of EPS
The effectiveness of EPS 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 system should return to nor-
mal within 10 minutes.

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2-4. Using other driving systems
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CAUTION
■When the slip indicator flashes and a warning buzzer sounds
This situation occurs immediately while VSC is activated. Always drive carefully.
Reckless driving may cause an accident. Exercise particular care when the indica-
tor light flashes and a buzzer sounds.
■Replacing tires
Make sure that all tires are of the same size, brand, tread pattern and total load
capacity. In addition, make sure that the tires are inflated to the recommended tire
pressure level.
The ABS and VSC systems will not function correctly if different tires are fitted on
the vehicle.
Contact your Lexus dealer for further information when replacing tires or wheels.
■Handling of tires and suspension
Using tires with any kind of problem or modifying the suspension will affect the
VDIM, and may cause the system to malfunction.

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5-2. Steps to take in an emergency
RX400h_U
(Flashing and then
continuously on)
Indicates a malfunction in the tire pressure warning
system. (→P. 3 3 2 )
(Flashing)
Malfunction in the traction control system or VSC
system.
(Flashing)
Indicates a malfunction in the dynamic laser cruise
control system.
Wa r n i n g m e s s a g eDetails

5
When trouble arises
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5-2. Steps to take in an emergency
RX400h_U
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warning may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Wa r n i n g m e s s a g eDetails
Indicates a malfunction in the traction control, VSC
systems.

471
Abbreviation list
RX400h_U
TINTire Identification Number
TWITreadwear Indicators
TPMSTire Pressure Warning System
VDIMVehicle Dynamics Integrated Management
VINVehicle Identification Number
VSCVehicle Stability Control
2WD2-Wheel Drive
ABBREVIATIONSMEANING

480
Alphabetical index
RX400h_U
Traction control ...................................... 169
Trailer towing........................................... 187
TransmissionTransmission ..........................................135
Trip information display....................... 146
Trip meter ................................................. 138
Turn signal lights Replacing light bulbs........................365
Switch ........................................................136
Wattage.................................................... 441
Valet key...................................................... 34
Vanity lights Vanity lights .......................................... 273
Wattage.................................................... 441
Vanity mirrors ........................................ 273
Vehicle identification number .......... 431
Vehicle stability control....................... 169
Video mode ............................................. 251
VDIM .......................................................... 169
VSC ............................................................. 169
Warning buzzers Brake system ...................................... 388
Key reminder ....................................... 393
Open door ............................................391
Open moon roof reminder ............391
Seat belt reminder...............................391
Warning lights Anti-lock brake system...................389
Automatic headlight leveling system ..................................................389
Brake assist system...........................389
Brake system ...................................... 388
Charging system ...............................389 Electric power steering
control system ................................. 389
Hybrid battery system .................... 389
Low fuel level......................................... 391
Low tire pressure warning light.......................................................... 391
Master warning light.......................... 391
Open door ............................................. 391
Pretensioners ...................................... 389
Seat belt reminder light .................... 391
SRS airbags.......................................... 389
Warning messages
AWD system....................................... 398
Dynamic laser cruise control ..................................... 399, 402
Engine oil maintenance.................. 402
Engine oil pressure........................... 398
Fuel lid..................................................... 407
Head light level................................... 399
Hybrid system..................................... 398
Moon roof............................................. 402
Open door ........................................... 402
Parking brake...................................... 402
Vehicle stability control........399, 401
Washer fluid ........................................ 402
Water temp.......................................... 398
Transmission selector lever ......... 402
Washer
Checking................................................329
Preparing and checking before winter...................................... 182
Switch........................................................ 152
Washing and waxing........................... 298
Weight Cargo capacity .................................... 178
Load limits.................................................181
Weight .................................................... 430
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