engine LEXUS RC350 2015 Owners Manual

2814-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the air condi-
tioning system to enhance fuel efficiency ( P. 416). To improve air conditioning perfor-
mance, adjust the fan speed or turn off Eco drive mode.
■Sport mode automatic deactivation
Sport mode is automatically deactivated if the engine switch is turned off after driving in
sport mode.

2834-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)
◆EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn the
steering wheel
◆Adaptive Variable Suspension system (if equipped)
By independently controlling the dampin g force of the shock absorbers for
each of the 4 wheels according to the road and driving conditions, this system
combines riding comfort with superior steering stability, and helps good vehi-
cle posture. ( P. 2 7 9 )
◆LDH (Lexus Dynamic Handling system) (if equipped)
Provides integrated control of the VGRS, DRS and EPS. Contributes to turn-
ing characteristics at low speeds, re sponsiveness at medium speeds and
safety at high speeds by controlling the steering angle of the front and rear
wheels in accordance with the steering wheel operation and vehicle speed.
◆VDIM (Vehicle Dynamics Integrated Management)
Provides integrated control of the ABS, brake assist, TRAC, VSC, hill-start
assist control, EPS, VGRS (if equi pped) and DRS (if equipped) systems
Helps to maintain vehicle stability when swerving on slippery road surfaces by
controlling the brakes, engine output, steering assist, and if equipped with
VGRS, steering ratio
◆PCS (Pre-Collision System) (if equipped)
 P. 2 9 0
◆BSM (Blind Spot Monitor) (if equipped)
P. 2 9 7
◆TVD (Torque Vectoring Differential) (if equipped)
P. 3 1 3

2844-5. Using the driving support systems
RC350/RCF_U (OM24636U)
The slip indicator light will flash while
the TRAC/VSC systems are operating.
If the vehicle gets stuck in mud, dirt or snow, the TRAC system may reduce
power from the engine to the wheels. Pressing (
) to turn the system
off may make it easier for you to rock the vehicle in order to free it.
RC350
To turn the TRAC system off, quickly
press and release .
The “TRAC OFF” will be shown on the
multi-information display.
Press again to turn the system
back on.
When the TRAC/VSC systems are operating
Disabling the TRAC system

2864-5. Using the driving support systems
RC350/RCF_U (OM24636U)
■Expert mode (RC F)
When expert mode is selected, it is possible to drive in a more sporty manner than other
drive modes. Expert mode disables the TRAC and VSC systems but the engine and
brakes may be controlled depending on the vehicle behavior.
■When the message is displayed on the mu lti-information display showing that TRAC
has been disabled even if has not been pressed (RC350)
TRAC and hill-start assist control cannot be operated. Contact your Lexus dealer.
■When the “TRAC OFF” indicator light comes on even if () has not been
pressed (RC F)
TRAC and hill-start assist control cannot be operated. Contact your Lexus dealer.
■VGRS is disabled when
VGRS may stop operating in the following situations.
In this event, the steering wheel may move fr om its straight forward position, but it will
return when the system restarts.
●When the steering wheel is operated for an extended period of time while the vehicle is
stopped or is moving very slowly
(on vehicles with LDH, DRS is disabled together with VGRS)
●When the steering wheel has been held fully to the left or right
The center position of the steering wheel may change when VGRS is disabled. However,
the position will return to normal after VGRS is reactivated.
■When the battery is disconnected (vehicles with VGRS)
The steering wheel may move fr om its straight forward position, but this will be corrected
automatically when driving. To select expert mode, press
()
when in SPORT S+ mode.
The “EXPERT” indicator will come on together
with the TRAC OFF and VSC OFF indicators.
To cancel expert mode, press
()
or use the driving mode se lect switch to select a
driving mode other than SPORT S+ mode.

2874-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC, hill-start assist
control and VGRS 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 sys-
tems.
●Any of the following condit ions 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.
• The brake pedal may pulsate slig htly after the ABS is activated.
• The brake pedal may move down s lightly after the ABS is activated.
■EPS, VGRS and DRS operation sound
When the steering wheel is operated, a motor sound may be heard. This does not indi-
cate a malfunction.
■Reactivation of the TRAC/VSC systems
Even after the TRAC/VSC systems have been turned off, turning the engine 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 vehicle
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 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 engine of f. The EPS system should return to normal
within 10 minutes.
■Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assist control will operate:
●The shift lever is in a position other than P or N (when starting off forward/backward on
an upward incline).
●The vehicle is stopped.
●The accelerator pedal is not depressed.
●The parking brake is not engaged.
■Automatic system cancelation of hill-start assist control
The hill-start assist control will turn off in any of the following situations:
●The shift lever is moved to P or N.
●The accelerator pedal is depressed.
●The parking brake is engaged.
●Approximately 2 seconds elapse after the brake pedal is released.

3094-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)• Immediately after the BSM main switch is turned on
• Immediately after the engine is started with the BSM main switch on
●Instances of the RCTA function unnecessarily detecting a vehicle and/or object may
increase in the following situations:
• When a vehicle passes by the side of your vehicle
• When the distance between your vehicle and metal objects, such as a guardrail,
wall, sign, or parked vehicle, which may reflect electrical waves toward the rear of
the vehicle, is short
• When backing out of a shallow angle park-
ing spot
• When the sensors cannot detect a vehicle due to obstructions
• When the parking spac e faces a street and
vehicles are being driven on the street

3114-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)
Operate the active rear wing switch to raise/retract the active rear wing manu-
ally. (The active rear wing retracts when it is raised and raises when retracted.)
■Operation by switch
*: Press and hold the switch until the indicator turns off. If the switch is released while the
active rear wing is moving, it will return to the raised position automatically.
■The active rear wing can be operated when
●The engine switch is in IGNITION ON mode.
●The trunk is closed.
■Conditions which stop the operation of the active rear wing
In the following situations operatio n of the active rear wing will stop:
●The engine switch is turned off while the active rear wing is operating.
●The trunk is opened while the active rear wing is operating.
●The raising operation of the active rear wing is interrupted by an object, etc.
●The active rear wing is operated in an unus ual manner causing it to stop at an irregular
position.
In such cases, pressing the active rear wing switch will fully raise the active rear wing. Or,
begin driving the vehicle and the active rear wing will raise automatically when the vehi-
cle speed reaches 16 mph (25 km/h).
■Restoring automatic operation after the active rear wing is operated manually
If the active rear wing is operated manually, automatic operation will resume according
to the vehicle speed.
■When there is a malfunction in the system
A warning message will be displayed on the multi-information display. (P. 551)
■Customization
The active rear wing can be held at the raised position or retracted position.
(Customizable features: P. 6 3 5 )
Manual operation
Vehicle speedUpDown
0 mph (0 km/h)
(vehicle stopped)PressPress and hold*
Approximately 0 – 12 mph (0 – 20 km/h)Operation not possibleOperation not possible
Approximately 12 – 80 mph (20 – 130 km/h)PressPress
Approximately 80 mph
(130 km/h) or moreOperation not possibleOperation not possible

3124-5. Using the driving support systems
RC350/RCF_U (OM24636U)
WA R N I N G
■When manually operating the active rear wing
Observe the following precautions before operating the active rear wing. Failure to do
so may result in death or serious injury.
●Ensure that the surrounding area is free of any objects that may come into contact
with or get caught on the active rear wing.
●If there is a risk that an object may become caught on the active rear wing during
operation, stop op eration immediately.
NOTICE
■To prevent system damage
●Do not apply pressure to the active rear wing when pushing or pulling the vehicle.
●Do not lean on the active rear wing.
●Do not attach any accessories or other objects to the active rear wing.
●Do not modify or disassemble the active rear wing.
●Do not subject the active rear wing to severe impact.
■To prevent battery discharge
Do not operate the active rear wing repeatedly while the engine is turned off.
●If there are people near the active rear wing,
make sure that there is no possibility of their
clothing, personal belongings or body parts
getting caught. Children especially should be
warned not to touch the active rear wing
while it is being operated.

3134-5. Using the driving support systems
4
Driving
RC350/RCF_U (OM24636U)
With the engine switch in IGNITION
ON mode, pressing the TVD switch
changes the TVD control mode.
The current TVD control mode will be
displayed on the meters.
STANDARD mode
This is the default mode and pro-
vides an optimum balance of driving
agility and stability.
SLALOM mode
This mode emphasizes enhanced
steering response.
TRACK mode
This mode emphasizes stability for
high speed sporty driving.
The multi-information display shows the distribution of driving force between the
right and left rear wheels. ( P. 1 1 0 )
TVD (Torque Vectoring Differential)

: If equipped
The TVD system distributes driving force (torque) between the right and left
rear wheels automatically. This syst em contributes to enhanced steering
response while cornering and increased traction when exiting a corner, pro-
viding an agile driving experience.
Changing TVD control modes
1
2
3
TVD control status on the multi-information display

3144-5. Using the driving support systems
RC350/RCF_U (OM24636U)
■Automatic cancelation of the selected TVD control mode
SLALOM and TRACK mode are canceled when the engine switch is turned off. When
the engine switch is turned to IGNITION ON mode, the TVD system will be in STAN-
DARD mode.
■Automatic disabling of the TVD system
If a malfunction is de tected in the TVD system, a warn ing message will be displayed on
the multi-information display ( P. 548) and the TVD system will be disabled automati-
cally. If the system is disabled, driving force will not be distributed by the TVD but through
normal differential operation.
■To protect the system
The TVD fluid temperature may become excessively high when driving for a long time
under extremely high load conditions. In th is case, a warning message will be displayed
on the multi-information display. ( P. 5 4 9 )
WA R N I N G
■Cautions regarding the use of the system
The driver is solely responsible for safe driv ing. Do not overly rely on the TVD system.
Always drive safely, taking care to observe your surroundings.