brake LEXUS RC300 2019 Repair Manual

3137-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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When trouble arises
1Stop the engine. Set the parking
brake and shift the shift lever to P.
2
Remove the mud, snow or sand
from around the rear wheels.
3
Place wood, stones or some other
material under the rear wheels to
help provide traction.
4
Restart the engine.
5
Shift the shift lever to D or R and
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal.
■When it is difficult to free the vehicle
Press the switch to turn off TRAC.
If the vehicle becomes stuck
Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Recovering procedure
WARNING
■When attempting to free a stuck vehi-
cle
If you choose to push the vehicle back
and forth to free it, make sure the sur-
rounding area is clear to avoid striking
other vehicles, objects or people. The
vehicle may also lunge forward or lunge
back suddenly as it becomes free. Use
extreme caution.
■When shifting the shift lever
Be careful not to shif t the shift lever with
the accelerator pedal depressed.
This may lead to un expected rapid accel-
eration of the vehicle that may cause an
accident resulting in death or serious
injury.
NOTICE
■To avoid damaging the transmission
and other components
●Avoid spinning the rear wheels and
depressing the accelerator pedal
more than necessary.
●If the vehicle remains stuck even after
these procedures are performed, the
vehicle may require towing to be freed.

3218-1. Specifications
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Vehicle specifications
Vehicles without LSD (Limited Slip Differential)
Vehicles with LSD (Limited Slip Differential)
*: Your Lexus vehicle is filled with “Toyota Genu ine Differential Gear Oil” at the factory.
Use Lexus approved “Toyota Ge nuine Differential Gear Oil” or an equivalent oil of
matching quality to satisfy th e above specification. Please contact your Lexus dealer for
further details.
Front differential (AWD models)
Oil capacity0.74 qt. (0.70 L, 0.61 Imp. qt.)
Oil type and viscosity
Hypoid gear oil API GL-5
Above 0°F (-18°C): SAE90
Below 0°F (-18°C): SAE80W or SAE80W-90
Rear differential
Oil capacity1.42 qt. (1.35 L, 1.19 Imp. qt.)
Oil type and viscosityToyota Genuine Differential Gear Oil LT
75W-85 GL-5 or equivalent
*
Oil capacity1.42 qt. (1.35 L, 1.19 Imp. qt.)
Oil type and viscosityToyota Genuine Differential Gear Oil LX
75W-85 GL-5 or equivalent
*
Brakes
Pedal clearance*1
RC350
4.3 in. (108 mm) Min.
RC350 AWD/RC300 AWD
4.5 in. (115 mm) Min.
RC300
4.1 in. (104 mm) Min.
Pedal free play0.04 0.24 in. (1.0 6.0 mm)
Brake pad wear limit0.04 in. (1.0 mm)
Parking brake lining wear limit0.04 in. (1.0 mm)

3228-1. Specifications
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*1: Minimum pedal clearance when depressed with a force of 112.4 lbf (500 N, 51.0 kgf)
while the engine is running.
*2: Parking brake pedal travel when depressed wi th a force of 67.4 lbf (300 N, 30.6 kgf)
Type A
Parking brake pedal travel*28 - 11 clicks
Fluid typeSAE J1703 or FMVSS No.116 DOT 3, or SAE
J1704 or FMVSS No.116 DOT 4 brake fluid
Steering
Free playLess than 1.2 in. (30 mm)
Tires and wheels
Tire size235/45R18 94Y, T155/70D17 110M (spare)
Tire inflation pressure (Rec-
ommended cold tire inflation
pressure)
Driving under normal conditions
Front: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Spare: 60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 100 mph [160 km/h]) (in
countries where such speeds are permitted by law)
Add 3 psi (20 kPa, 0.2 kgf/cm
2 or bar) to the front tires, 6
psi (40 kPa, 0.4 kgf/cm
2 or bar) to the rear tires. Never
exceed the maximum co ld tire inflation pressure indicated
on the tire sidewall.
Wheel size18  8J, 17  4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

3338-1. Specifications
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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

3348-1. Specifications
RC350AWD_RC350_RC300AWD_RC30
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Maximum loaded vehicle weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight
150 lb. (68 kg) times the number of occupants
specified in the second column of Table 1
* that fol-
lows
Occupant distributionDistribution of occupants in a vehicle as specified in
the third column of Table 1
* below
Production options weight
The combined weight of installed regular produc-
tion options weighing over 5 lb. (2.3 kg) in excess of
the standard items which they replace, not previ-
ously considered in curb weight or accessory
weight, including heavy duty brakes, ride levelers,
roof rack, heavy duty battery, and special trim
RimA metal support for a tire or a tire and tube assem-
bly upon which the tire beads are seated
Rim diameter (Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’s designation for a rim
by style or code
Rim widthNominal distance between rim flanges
Vehicle capacity weight (Total load
capacity)The rated cargo and luggage load plus 150 lb. (68
kg) times the vehicle’s designated seating capacity
Vehicle maximum load on the tire
The load on an individual ti re that is determined by
distributing to each axle its share of the maximum
loaded vehicle weight, and dividing by two
Vehicle normal load on the tire
The load on an individual ti re that is determined by
distributing to each axle its share of curb weight,
accessory weight, and normal occupant weight
(distributed in accor dance with Table 1
* below), and
dividing by two
Weather sideThe surface area of the rim not covered by the
inflated tire
Tire related termMeaning

3398-2. Customization
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Vehicle specifications
8-2.Customization
■Changing by using the meter con-
trol switches
1
Press or to select .
2
Operate the switches to select a
desired item.
3
Change the setting by referring to
the message displayed on the
screen.
■Changing by using the Remote
Touch
1
Press the “MENU” button on the
Remote Touch.
2
Select “Setup” on the menu screen
and select “Vehicle”.
3
Select “Vehicle Customization”,
“LEXUS Park Assist” or “Drive
Mode Customization”. Various setting can be changed. Refer
to the list of settings that can be
changed for details.
For details on the Remote Touch, refer
to the “NAVIGATION AND MULTI-
MEDIA SYSTEM OWNER’S MAN-
UAL”.
■When customizing using the Remote
Touch
Stop the vehicle in a safe place, apply the
parking brake, and shift the shift lever to P.
Also, to prevent battery discharge, leave
the engine running while customizing the
features.
Some function settings are changed simultaneously with other functions being cus-
tomized. Contact your Lexus dealer for further details.
Settings that can be changed using the Remote Touch
Settings that can be changed using the meter control switches
Settings that can be changed by your Lexus dealer
Customizable features
Your vehicle includes a variety of
electronic features that can be per-
sonalized to your preferences. The
settings of these features can be
changed by using the meter control
switches, the Remote Touch or at
your Lexus dealer.
Customizing vehicle features
WARNING
■During customization
As the engine needs to be running
during customization, ensure that the
vehicle is parked in a place with ade-
quate ventilation. In a closed area such as
a garage, exhaust gases including harm-
ful carbon monoxide (CO) may collect
and enter the vehicle. This may lead to
death or a serious health hazard.
NOTICE
■During customization
To prevent battery discharge, ensure that
the engine is running while customizing
features.
Customizable features
A
B
C

370What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
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1-1.What to do if... (Troubleshooting)What to do if... (Troubleshooting)
 If you lose your mechanical keys,
new genuine mechanical keys can
be made by your Lexus dealer.
( P.303)
 If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( P.303)
 Is the electronic key battery weak or
depleted? ( P.265)
 Is the engine switch in IGNITION
ON mode?
When locking the doors, turn the engine
switch off. ( 
P.126)
Is the electronic key left inside the
vehicle?
When locking the doors, make sure that
you have the electronic key on your per-
son.
The function may not operate prop-
erly due to the condition of the radio
wave. ( P.94)
 The function to prevent the elec-
tronic key from being left inside the
trunk will operate and you can open
the trunk as usual. Take the key out
from the trunk. ( P.91)
 Did you press the engine switch
while firmly depressing the brake
pedal? ( P.125)
 Is the shift lever in P? ( P.125)
 Is the electronic key anywhere
detectable inside the vehicle?
( P.93)
 Is the steering wheel unlocked?
( P.125)
 Is the electronic key battery weak or
depleted?
In this case, the engine can be started in a
temporary way. ( 
P.305)
Is the battery discharged?
( P.306)
If you have a problem, check the
following before contacting your
Lexus dealer.
The doors cannot be locked,
unlocked, opened or closed
You lose your keys
The electronic key does not
operate properly
The doors cannot be locked or
unlocked
The trunk lid is closed with the
electronic key left inside
If you think something is wrong
The engine does not start
The shift lever cannot be shifted
from P even if you depress the
brake pedal

3711-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810371What to do if... (Troubleshooting)
 Is the engine switch in IGNITION
ON mode?
If you cannot release the shift lever by
depressing the brake pedal with the engine
switch in IGNITION ON mode. ( 
P.129)
It is locked automatically to prevent
theft of the vehicle. ( P.125)
 Is the window lock switch pressed?
The power window except for the one at
the driver’s seat cannot be operated if the
window lock switch is pressed. ( 
P.111)
The auto power off function will be
operated if the vehicle is left in
ACCESSORY or IGNITION ON
mode (the engine is not running) for
a period of time. ( P.127)
 The seat belt reminder light is flash-
ing
Are the driver and the front passenger
wearing the seat belts? ( 
P.286)
The parking brake indicator is on
Is the parking brake released? ( P.134)
Depending on the situation, other
types of warning buzzer may also
sound. (P.282, 290)
 Did anyone inside the vehicle open
a door during setting the alarm?
The sensor detects it and the alarm sounds.
(
P.58)
Do one of the following to deactivate
or stop the alarm:
 Unlock the doors.
 Open the trunk using the entry
function or wireless remote control.
 Turn the engine switch to ACCES-
SORY or IGNITION ON mode, or
start the engine.
 Is the message displayed on the
multi-information display?
Check the message on the multi-informa-
tion display. ( 
P.290)
When a warning light turns on or a
warning message is displayed, refer
to P.282, 290.
The steering wheel cannot be
turned after the engine is
stopped
The windows do not open or
close by operating the power
window switches
The engine switch is turned off
automatically
A warning buzzer sounds during
driving
An alarm is activated and the
horn sounds
A warning buzzer sounds when
leaving the vehicle
A warning light turns on or a
warning message is displayed

3731-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810373Alphabetical Index
Alphabetical Index
A
A/C Air conditioning filter ............................... 264
Automatic air conditioning system ...205
Micro dust and pollen filter...................209
ABS (Anti-lock Brake System)................192 Warning light ............................................... 283
Active Sound Control (ASC) ..................134
Adaptive Variable Suspension System 192
Air conditioning filter ................................. 264
Air conditioning system Air conditioning filter ............................... 264
Automatic air conditioning system ...205
Micro dust and pollen filter...................209
Airbags Airbag operating conditions................... 30
Airbag precautions for your child .........32
Correct driving posture .............................23
Curtain shield airbag operating condi-tions .................................................................. 30
Curtain shield airbag precautions ........32
Front passenger occupant classification system ............................................................. 36
General airbag precautions ....................32
Locations of airbags.................................... 28
Modification and disposal of airbags . 35
Side airbag operating conditions ......... 30
Side airbag precautions .............................32
Side and curtain shield airbags operating conditions...................................................... 30
Side and curtain shield airbags precau- tions ...................................................................32
SRS airbags ..................................................... 28
SRS warning light ...................................... 283
Alarm ................................................................... 58 Warning buzzer ......................................... 282
Anchor brackets ............................................... 41
Antennas (smart access system with push-button start)........................................ 93
Anti-lock Brake System (ABS)................192 Warning light ............................................... 283 Approach warning........................................ 173
ASC (Active Sound Control) ..................134
Assist grips ..................................................... 220
Audio system-linked display ...................... 75
Automatic air conditioning system ...... 205
Automatic headlight leveling system .... 137
Automatic High Beam ............................... 138
Automatic light control system................136
Automatic transmission ..............................128
M mode ............................................................. 131
Paddle shift switches ........................ 130, 131
Snow mode.................................................... 130
Average fuel economy..................................72
Average vehicle speed .................................72
B
Back-up light Replacing light bulbs ................................270
Wattage ..........................................................326
Battery Battery checking ........................................253
If the battery is discharged ................... 306
Preparing and checking before winter.....196
Warning light ...............................................282
Boost gauge.......................................................74
Brake Fluid.....................................................................321
Parking brake ................................................134
Warning light ...............................................282
Brake assist ......................................................192
Break-in tips...................................................... 117
Brightness control Instrument panel light control................... 71
C
Card key ............................................................ 82
CareAluminum wheels ...................................... 232
Exterior............................................................ 232
Interior .............................................................235

376Alphabetical Index
RC350AWD_RC350_RC300AWD_RC30
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Checking .......................................................250
Preparing and checking before winter .... 196
Engine coolant temperature gauge ....... 66
Engine immobilizer system .........................57
Engine oil Capacity .......................................................... 318
Checking ....................................................... 248
Preparing and checking before winter ....196
Warning light ............................................... 283
Engine oil maintenance data .................. 250
Engine oil pressure gauge ...........................74
Engine oil temperature gauge ...................74
Engine switch ..................................................125 Auto power off function ........................... 127
Changing the engine switch modes.. 126
If your vehicle has to be stopped in an
emergency ................................................ 274
EPS (Electric Power Steering) ................192 Warning light ............................................... 284
Event data recorder (EDR) ............................6
F
First-aid kit storage belt ..............................219
Flat tire Tire pressure warning system .............258
Vehicles with a spare tire ...................... 294
Floor mats ...........................................................22
Fluid Automatic transmission .......................... 320
Brake...................................................... 252, 321
Washer ........................................................... 254
Footwell light ...................................................215
Front passenger occupant classification system .............................................................. 36
Front position lights Wattage.......................................................... 326
Front seats Adjustment....................................................... 97
Cleaning......................................................... 235
Correct driving posture .............................23 Driving position memory ........................ 100
Head restraints............................................. 103
Memory recall function............................ 102
Power easy access system .................... 100
Seat heaters .................................................... 212
Seat position memory ..............................100
Seat ventilators .............................................. 212
Front side marker light Light switch .................................................... 136
Front turn signal lights Replacing light bulbs ................................270
Turn signal lever .......................................... 133
Wattage ..........................................................326
Fuel Capacity .......................................................... 318
Fuel gauge ........................................................ 66
Fuel pump shut off system...................... 281
Information .................................................... 327
Refueling.......................................................... 148
Type ................................................................... 318
Warning light .............................................. 286
Fuel consumption Average fuel economy .............................. 72
Current fuel consumption ........................ 72
Fuel filler door If the fuel filler door cannot be opened ....
303
Refueling.......................................................... 148
Fuel gauge ......................................................... 66
Fuel pump shut off system..........................281
Fuses ..................................................................267
G
Garage door opener ................................. 222
Gauges ............................................................... 66
Gear Position ................................................... 75
G-force................................................................74
Glove box ......................................................... 217
Glove box light ...............................................218