2020 LEXUS RC300 traction control

1944-5. Using the driving support systems
■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 brak-
ing 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 sudden ly or turning on
slippery road surfaces
■Enhanced VSC (Enhanced Vehi-
cle Stability Control)
Provides cooperative control of the
ABS, TRAC, VSC and EPS.
Helps to maintain directional stability
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.
■TRAC (Traction Control)
Helps to maintain drive power and pre-
vent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads
■Hill-start assist control
Helps to prevent the vehicle from roll-
ing backward when starting on an
incline
■VGRS (Variable Gear Ratio Steer-
ing) (if equipped)
Adjusts the front wheel turning angle in
accordance with the vehicle speed and
steering wheel movement
■DRS (Dynamic Rear Steering) (if
equipped)
Contributes to the turning characteris-
tics and responsiveness of the vehicle
by adjusting the rear wheel angle of the
vehicle in accordance with steering
wheel movement.
■EPS (Electric Power Steering)
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel
■Adaptive Variable Suspension Sys-
tem (if equipped)
By independently controlling the
damping force of th e shock absorbers
for each of the 4 wheels according to
the road and driving conditions, this
system combines riding comfort with
superior vehicle stability, and helps
good vehicle posture.
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.
Summary of the driving assist
systems

1954-5. Using the driving support systems
4
Driving
■LDH (Lexus Dynamic Handling
system) (if equipped)
Provides integrated control of the
VGRS, DRS and EPS. Contributes to
turning characteristics at low speeds,
responsiveness 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 Inte-
grated Management)
Provides integrated control of the
ABS, brake assist, TRC, VSC, hill-start
assist control, EPS, VGRS (if
equipped) and DRS (if equipped) sys-
tems
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
■When the TRAC/VSC systems are
operating
The slip indicator light will flash while the
TRAC/VSC systems are operating.
■Disabling the TRAC system
If the vehicle gets stuck in mud, dirt or snow,
the TRAC system may reduce power from
the engine to the wheels. Pressing the
switch to turn the system off may make it
easier for you to rock the vehicle in order to free it.
To turn the TRAC system off, quickly press
and release the switch.
The “Traction Co
ntrol Turned Off” will be
shown on the multi-information display.
Press the switch ag ain to turn the sys-
tem back on.
■Turning off both TRAC and VSC sys-
tems
To turn the TRAC and VSC systems off,
press and hold the switch for more
than 3 seconds while the vehicle is stopped.
The VSC OFF indicator light will come on
and the “Traction Control Turned Off” will
be shown on the multi-information display.
*
Press the switch ag ain to turn the sys-
tems back on.
*: On vehicles with PCS (Pre-Collision System), pre-collision brake assist,
pre-collision braking, and steering con-
trol (performed through cooperative
control of PCS and LDH) (if equipped)
will also be disabled. The Pre-Collision
System warning light will come on and a
message will be di splayed on the
multi-information display. ( P.162)

2877-2. Steps to take in an emergency
7
When trouble arises
■LDA (Lane Departure Alert) indicator
■PCS warning light
■Slip indicator
Warning lightDetails/Actions
(orange)
If the LDA indicator is illuminated:
Indicates a malfunction in the LDA (Lane Departure Alert with steering
control) system.
Check the warning message displayed on the multi-information
display. ( P.168)
If the LDA indicator flashes:
Indicates that the vehicle has deviated from the lane (while the LDA
[Lane Departure Alert with steering control] system is operating)
 Check the area around the vehicle and return the vehicle to
between the lane lines.
Warning lightDetails/Actions
(flashes or illumi-
nates)
When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-Collision System).
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
The PCS (Pre-Collision System) has become temporarily unavailable,
corrective action may be necessary.
 Follow the instructions displayed on the multi-information display.
(  P.154, 294)
If the PCS (Pre-Collision System) or VSC (Vehicle Stability Control)
system is disabled, the PCS warning light will illuminate.
 P.162
Warning lightDetails/Actions
Indicates a malfunction in:
The VSC (Vehicle Stability Control) system;
 The TRAC (Traction Control) system; or
 The hill-start assist control system
The light will flash when the VSC or the TRAC system is operating.
 Have the vehicle inspected by your Lexus dealer immediately.

3348-1. Specifications
Wheel diameter
Bead
Sidewall
Shoulder
Tread
Belt
Inner liner
Reinforcing rubber
Carcass
Rim lines
Bead wires
Chafer
This information has been prepared in
accordance with regulations issued by
the National Highway Traffic Safety
Administration of the U.S. Department
of Transportation.
It provides the purchasers and/or pro-
spective purchasers of Lexus vehicles
with information on uniform tire quality
grading.
Your Lexus dealer will help answer any questions you may have as you read this
information.
■DOT quality grades
All passenger vehicle tires must con-
form to Federal Safety Requirements in
addition to these grades. Quality
grades can be found where applicable
on the tire sidewall between tread
shoulder and maximum section width.
For example: Treadwear 200 Traction AA
Temperature A
■Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would wear
one and a half (1 - 1/2) times as well on the
government course as a tire graded 100.
The relative performance of tires depends
upon the actual conditions of their use.
Performance may differ significantly from
the norm due to variatio ns in driving habits,
service practices and differences in road
characteristics and climate.
■Traction AA, A, B, C
The traction grades, from highest to
lowest, are AA, A, B and C, and they
represent the tire’s ability to stop on
wet pavement as measured under con-
trolled conditions on specified govern-
ment test surfaces of asphalt and
concrete.
A tire marked C may have poor traction
performance.
Warning: The traction grade assigned to
this tire is based on braking (straight
ahead) traction tests and does not include
Tire section names
Uniform Tire Quality Grading
C
A
B
C
D
E
F
G
H
I
J
K

3358-1. Specifications
8
Vehicle specifications
cornering (turning) traction.
■Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudden tire failure. Grade C corresponds to
a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Warning: The temperature grades of a tire
assume that it is properly inflated and not
overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
nation, can cause heat buildup and
possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pressureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic trans-
mission, power steering, power brakes, power win-
dows, power seats, radio and heater, to the extent
that these items are available as factory-installed
equipment (whether installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil
and coolant, and if so equipped, air conditioning
and additional weight optional engine

384Alphabetical Index
Instrument panel light control switches............................................................................ 69
Light switches ................................................ 137
Moon roof switches .....................................112
“ODO TRIP” switch .................................... 68
Outside rear view mirror switches .... 108
Paddle shift switches ......................... 131, 132
PCS OFF switch ......................................... 158
Power door lock switch ............................88
Power window switches ........................... 110
Rear window and outside rear view mir- ror defoggers switch ............................ 207
Seat heater switches .................................. 214
Seat ventilator switches ............................ 214
Snow mode switch ...................................... 131
“SOS” button .................................................. 52
Tilt and telescopic steering control switch .......................................................................... 106
Tire pressure warning reset switch .. 262
Trunk opener main switch ....................... 92
Trunk opener switch ................................... 90
VSC OFF switch ........................................ 195
Window lock switch ..................................... 111
Windshield wiper and washer switch142
Windshield wiper de-icer switch ..........211
T
Tachometer....................................................... 64 Rev indicator ................................................... 67
Rev peak ........................................................... 67
Tail lights Light switch ..................................................... 137
Replacing light bulbs.................................272
Wattage.......................................................... 328
Theft deterrent system Alarm .................................................................. 57
Engine immobilizer system ..................... 56
Theft prevention labels...............................58
Tire inflation pressure Maintenance data...................................... 324
Tire inflation pressu re display function
.........................................................................260 Warning light .............................................. 289
Tire information ..............................................331 Glossary .........................................................335
Size ....................................................................333
Tire identification number...................... 332
Uniform Tire Quality Grading ............334
Tire infration pressure ...................................73
Tire pressure display ... ............................... 260
Tire pressure warning system Function ......................................................... 260
Initializing........................................................ 262
Installing tire pres sure warning valves
and transmitters.........................................261
Registering ID codes ...............................263
Warning light .............................................. 289
Tires Chains .............................................................. 199
Checking ....................................................... 257
If you have a flat tire ..................................296
Inflation pressure ........................................263
Information ..................................................... 331
Replacing .......................................................296
Rotating tires ................................................259
Size .................................................................... 324
Snow tires ....................................................... 198
Spare tire ........................................................296
Tire inflation pressure display function......................................................................... 260
Tire pressure warning system ............ 260
Warning light .............................................. 289
Tools.................................................................. 296
Top tether strap.........................................41, 49
Total load capacity ....................................... 318
Towing Dinghy towing ...............................................124
Emergency towing.................................... 279
Towing eyelet................................................ 281
Trailer towing .................................................124
TRAC (Traction Control) ..........................194
Traction Control (TRAC) ..........................194
Trailer towing .................................................. 124