ignition LEXUS RC300 2019 Service Manual

2867-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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■Low fuel level warning light
■Driver’s and front passenger’s seat belt reminder light (warning buzzer)*
*: Driver’s seat belt warning buzzer:
The driver’s seat belt warning buzze sounds to alert the driver that his or her seat belt is
not fastened. Once the engine switch is turned to IGNITION ON mode, the buzzer
sounds for 6 seconds. If the vehicle reaches a speed of 12 mph (20 km/h), the buzzer
sounds once. If the seat belt is still unfast ened after 24 seconds, the buzzer will sound
intermittently for 6 seconds. Th en, if the seat belt is still unfastened, the buzzer will sound
in a different tone for 90 more seconds.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt warning buzzer sounds to alert the front passenger that
his or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches a speed
of 12 mph (20 km/h). If the se at belt is still unfastened after 24 seco nds, the buzzer will
sound intermittently for 6 seconds. Then, if the seat belt is still unfastened, the buzzer will
sound in a different tone for 90 more seconds.
■Rear passengers’ seat belt r eminder lights (warning buzzer)*
*: Rear passengers’ seat belt warning buzzer:
The rear passenger’s seat belt warning buzzer sounds to alert the rear passenger that his
or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches a speed of
12 mph (20 km/h). If the seat belt is still unfastened after 24 seconds, the buzzer will
sound intermittently for 6 seconds. Then, if the seat belt is still unfastened, the buzzer will
sound in a different tone for 24 more seconds.
Warning lightDetails/Actions
Indicates that remaining fuel is approximately 2.6 gal. (10 L, 2.2 Imp.
gal.) or less
 Refuel the vehicle.
Warning lightDetails/Actions
Warns the driver and/or front pass enger to fasten their seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front passenger’s seat
belt also needs to be fastened to make the warning light (warning
buzzer) turn off.
Warning lightDetails/Actions
Warns the rear passengers to fasten their seat belts
 Fasten the seat belt.

2887-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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■When the tire pressure warning light
comes on
Check the tire inflation pressure and adjust
to the appropriate level. Pushing the tire
pressure warning reset switch will not turn
off the tire pressure warning light.
■The tire pressure warning light may
come on due to natural causes
The tire pressure warning light may come
on due to natural causes such as natural air
leaks and tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes).
■When a tire is replaced with the spare
tire
The spare tire is not equipped with a tire
pressure warning valve and transmitter. If a
tire goes flat, the tire pressure warning light
will not turn off even though the flat tire has
been replaced with the spare tire.
■Conditions that the tire pressure warn-
ing system may not function properly
 P.258
■If the tire pressure warning light fre-
quently comes on after blinking for 1
minute
If the tire pressure wa rning light frequently
comes on after blinking for 1 minute when
the engine switch is turned to IGNITION
ON mode, have it checked by your Lexus
dealer.
■Warning buzzer
In some cases, the buzzer may not be heard
due to being in a noisy location or audio
sound.
WARNING
■If both the ABS and the brake system
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer. The
vehicle will become extremely unstable
during braking, and the ABS system may
fail, which could cause an accident
resulting in death or serious injury.
■When the electric power steering
system warning light comes on
The steering wheel may become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.
■If the tire pressure warning light
comes on
Be sure to observe the following precau-
tions. Failure to do so could cause a loss
of vehicle control and result in death or
serious injury.
●Stop your vehicle in a safe place as
soon as possible. Adjust the tire infla-
tion pressure immediately.
●If the tire pressure warning light comes
on even after tire inflation pressure
adjustment, it is prob able that you have
a flat tire. Check the tire s. If a tire is flat,
change it with the spare tire and have
the flat tire repaired by the nearest
Lexus dealer.
●Avoid abrupt maneuvering and brak-
ing. If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.
■If a blowout or sudden air leakage
should occur
The tire pressure warning system may
not activate immediately.
■Maintenance of the tires
Each tire, including the spare (if pro-
vided), should be checked monthly when
cold and inflated to the inflation pressure
recommended by the vehicle manufac-
turer on the vehicle placard or tire infla-
tion pressure label (tire and load
information label). (If your vehicle has
tires of a different size than the size indi-
cated on the vehicle placard or tire infla-
tion pressure label [tire and load
information label], you should determine
the proper tire inflation pressure for
those tires.)

3057-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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7
When trouble arises
■Key linked functions
1Locks both side door
2
Closes the windows and moon roof
(if equipped) (turn and hold)
*
3Unlocks the door
Turning the key rearward unlocks the
driver’s door. Turning the key again unlocks
the other door.
4Opens the windows and moon roof
(if equipped) (turn and hold)
*
*: These settings must be customized at
your Lexus dealer.
1Ensure that the shift lever is in P and
depress the brake pedal.
2
Touch the Lexus emblem side of the
electronic key to the engine switch.
When the electronic key is detected, a
buzzer sounds and the engine switch will
turn to IGNITION ON mode.
When the smart access system with
push-button start is deactivated in custom-
ization setting, the engine switch will turn
to ACCESSORY mode.
3Firmly depress the brake pedal and
check that is shown on the
multi-information display.
4
Press the engine switch.
In the event that the engine still cannot
be started, contact your Lexus dealer.
WARNING
■When using the mechanical key and
operating the power windows or
moon roof
Operate the power window or moon
roof after checking to make sure that
there is no possibility of any passenger
having any of their body parts caught in
the window or moon roof.
Also, do not allow children to operate the
mechanical key. It is possible for children
and other passengers to get caught in
the power window or moon roof.
Starting the engine

3087-2. Steps to take in an emergency
RC350AWD_RC350_RC300AWD_RC30
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5Open and close any of the door of
your vehicle with the engine switch
off.
6
Maintain the engine speed of the
second vehicle and start the engine
of your vehicle by turning the
engine switch to IGNITION ON
mode.
7
Once the vehicle’s engine has
started, remove the jumper cables
in the exact reverse order from
which they were connected.
Once the engine starts, have the vehi-
cle inspected at your Lexus dealer as
soon as possible.
■Starting the engine when the battery is
discharged
The engine cannot be started by push-start-
ing.
■To prevent battery discharge
●Turn off the headlights and the audio sys-
tem while the engine is off.
●Turn off any unnecessary electrical com-
ponents when the vehicle is running at a
low speed for an extended period, such
as in heavy traffic.
■Charging the battery
The electricity stored in the battery will dis-
charge gradually even when the vehicle is
not in use, due to natural discharge and the
draining effects of certain electrical appli-
ances. If the vehicle is left for a long time,
the battery may discharge, and the engine
may be unable to start. (The battery
recharges automatically during driving.)
■When recharging or replacing the bat-
tery
●In some cases, it may not be possible to
unlock the doors using the smart access
system with push-button start when the
battery is discharged. Use the wireless
remote control or the mechanical key to
lock or unlock the doors.
●The engine may not start on the first
attempt after the battery has recharged
but will start normally after the second
attempt. This is not a malfunction.
●The engine switch mode is memorized by
the vehicle. When the battery is recon-
nected, the system will return to the
mode it was in before the battery was dis-
charged. Before disconnecting the bat-
tery, turn the engine switch off.
If you are unsure wh at mode the engine
switch was in before the battery dis-
charged, be especially careful when
reconnecting the battery.
WARNING
■Avoiding battery fires or explosions
Observe the following precautions to
prevent accidentally igniting the flamma-
ble gas that may be emitted from the bat-
tery:
●Make sure each jumper cable is con-
nected to the correct terminal and that
it is not unintentiona lly in contact with
any other than the intended terminal.
●Do not allow the other end of the
jumper cable connected to the “+” ter-
minal to come into contact with any
other parts or metal surfaces in the
area, such as brackets or unpainted
metal.
●Do not allow the + and - clamps of the
jumper cables to come into contact
with each other.
●Do not smoke, use matches, cigarette
lighters or allow open flame near the
battery.
■Battery precautions
The battery contains poisonous and cor-
rosive acidic electrol yte, while related
parts contain lead and lead compounds.
Observe the following precautions when
handling the battery:

3208-1. Specifications
RC350AWD_RC350_RC300AWD_RC30
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■Spark plug
*: The fluid capacity is a reference quantity.If replacement is necessary, contact your Lexus dealer.
Ignition system (spark plug)
RC350/RC300 AWDRC300
MakeDENSO FK20HBR8NGK DILFR7K9G
Gap0.031 in. (0.8 mm)0.035 in. (0.9 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.
Electrical system (battery)
Open voltage at 68°F (20°C):
12.3 V or higher
If the voltage is lower than the standard value,
charge the battery.
(Voltage is checked 20 minutes after the engine
and all lights are turned off.)
Charging rates5 A max.
Automatic transmission
Fluid capacity*
RC350
10.0 qt. (9.5 L, 8.4 Imp. qt.)
RC350 AWD/RC300 AWD
10.6 qt. (10.0 L, 8.8 Imp. qt.)
RC300
9.2 qt. (8.7 L, 7.7 Imp. qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■Automatic transmission fluid type
Using transmission fluid other than “Toyota Genuine ATF WS” may ca use deterioration in
shift quality, locking up of your transmission accompanied by vibration, and ultimately
damage the transmission of your vehicle.

3488-2. Customization
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810function cannot be customized.
●When the doors remain closed after
unlocking the doors and the timer acti-
vated automatic door lock function acti-
vates, signals will be generated in
accordance with the operation buzzer
volume and operational signal (Emer-
gency flashers) function settings.
●Some settings can be changed using a
switch or the Center Display. If a setting is
changed using a switch, the changed set-
ting will not be reflected on the Center
Display screen until th
e engine switch is
turned off and then to IGNITION ON
mode.

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

3751-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810375Alphabetical Index
Doors Automatic door lock ing and unlocking
system .............................................................88
Door glasses ................................................... 110
Door lock.......................................................... 86
Open door warning buzzer87, 88, 285
Open door warning light ......................285
Outside rear view mirrors ..................... 108
Drive distance ...................................................72
Drive info 1/Drive info 2/Drive info 3.....72
Drive information ............................................72
Driver’s seat position memory Driving position memory........................ 100
Memory recall function ............................102
Power easy access system .................... 100
Drive-start control ......................................... 117
Driving Break-in tips .....................................................117
Correct driving posture .............................23
Driving mode select switch ................... 190
Procedures ...................................................... 116
Winter drive tips...........................................196
Driving assist system information display.... 76
Driving information display .........................72
Driving position memory........................... 100 Memory recall function ............................102
Power easy access system .................... 100
Driving range ....................................................72
DRS (Dynamic Rear Steering) ................192
Dynamic radar cruise control ................. 168 Warning message.......................... 175, 290
Dynamic Rear Steering (DRS) ................192
E
Eco Driving Indicator.....................................73
Eco Driving Indicator Light .........................73
EDR (Event data recorder) ............................6
Elapsed time ......................................................72
Electric Power Steering (EPS) ................192 Warning light ............................................... 284 Electronic key .................................................. 82
Battery-saving function.............................. 94
If the electronic key does not operate properly ...................................................... 304
Replacing the battery ...............................265
Emergency flashers .....................................274
Emergency, in case of If a warning buzzer sounds...................282
If a warning light turns on.......................282
If a warning message is displayed .... 290
If the battery is discharged ................... 306
If the electronic key does not operate properly ...................................................... 304
If the engine will not start......................... 301
If the fuel filler door cannot be opened ....
303
If the vehicle is trapped in rising water...... 275
If you have a flat tire .................................. 294
If you lose your keys ................................ 303
If you think something is wrong......... 280
If your vehicle becomes stuck .............. 313
If your vehicle has to be stopped in an emergency ................................................. 274
If your vehicle needs to be towed ..... 277
If your vehicle overheats ....................... 309
Engine ACCESSORY mode................................126
Compartment.............................................. 247
Engine switch ................................................ 125
Fuel pump shut off system...................... 281
Hood ................................................................245
How to start the engine ........................... 125
Identification number .................................317
If the engine will not start......................... 301
If your vehicle has to be stopped in an emergency ................................................. 274
Ignition switch (engine switch)............. 125
Overheating ................................................ 309
Tachometer ..................................................... 66
Engine coolant Capacity .......................................................... 319

3771-1. What to do if... (Troubleshooting)
RC350AWD_RC350_RC300AWD_RC30
0_OM_(U)_1810377Alphabetical Index
H
Head restraints .............................................. 103
Headlight aim ................................................ 269
Headlights Automatic High Beam system............. 138
Light switch .....................................................136
Replacing light bulbs................................ 270
Wattage.......................................................... 326
Heated steering wheel ................................ 212
Heaters Automatic air conditioning system ...205
Heated steering wheel.............................. 212
Outside rear view mirrors ....................209
Seat heaters .................................................... 212
High mounted stoplight Replacing light bulbs................................ 270
Hill-start assist control .................................192
Hood Open ............................................................... 245
Hooks Cargo hooks.................................................. 219
Coat hooks ................................................... 220
Retaining hooks (floor mat)......................22
Horn ....................................................................107
I
I/M test ............................................................ 242
Identification Engine ............................................................... 317
Vehicle ..............................................................316
Ignition switch (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
Illuminated entry system ............................. 216
Indicators ........................................................... 64
Initialization Items to initialize ......................................... 349
Maintenance ................................... 238, 250
Power windows............................................. 110 Tire pressure warning system ............ 260
Inside rear view mirror ................................107
Instrument panel light co ntrol ..................... 71
Intercooler...................................................... 252
Intercooler coolant Capacity .......................................................... 319
Checking ...................................................... 250
Interior lights....................................................215 Front interior light ....................................... 215
Rear interior light......................................... 215
Intuitive parking assist Warning message ...................................... 178
J
JackPositioning a floor jack ............................245
Vehicle-equipped jack ........................... 294
Jack handle .................................................... 294
Jam protection function Moon roof ........................................................ 113
Power windows ............................................. 110
K
Keyless entrySmart access system with push-button start ................................................................... 93
Wireless remote control ...........................84
Keys Battery-saving function.............................. 94
Electronic key ................................................. 82
Engine switch ................................................ 125
If the electronic key does not operate properly ...................................................... 304
If you lose your keys ................................ 303
Key number plate ......................................... 82
Keyless entry ..........................................86, 93
Mechanical key .............................................. 82
Replacing the battery ...............................265
Warning buzzer ............................................ 93
Wireless remote control ...........................84
Knee airbags .................................................... 28