2021 LEXUS RX350 ignition

4107-2. Steps to take in an emergency
The light will go off after several driving
trips.
If the light does not go off even after several
trips, contact your Lexus dealer as soon as
possible.
■Electric power steering system warning
light (warning buzzer)
When the battery charge becomes insuffi-
cient or the voltage temporarily drops, the
electric power steeri ng system warning
light may come on and the warning buzzer
may sound.
■When the tire pressure warning light
comes on
Inspect the tires to check if a tire is punc-
tured.
If a tire is punctured: P.416
If none of the tires are punctured:
Turn the engine switch off then turn it to
IGNITION ON mode. Check if the tire
pressure warning light comes on or blinks.
If the tire pressure wa rning light blinks for
1 minute then stays on
There may be a malfunction in the tire
pressure warning syst em. Have the vehicle
inspected by your Lexus dealer immedi-
ately.
If the tire pressure warning light comes
on
1 After the temperature of the tires has
lowered sufficiently, check the inflation
pressure of each tire and adjust them to
the specified level.
2 If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation pres-
sure of each tire is at the specified level
and perform initialization. ( P.371)
If the warning light does not turn off several
minutes after the initia lization has been per-
formed, have the vehicle inspected by your
Lexus dealer immediately.
■The tire pressure warning light may
come on due to natural causes
The tire pressure wa rning 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 a spare tire
The compact spare tire is not equipped with
a tire pressure warning valve and transmit-
ter. If a tire goes flat , the tire pressure warn-
ing light will not turn off even though the flat
tire has been replaced with the spare tire.
Replace the spare tire with the repaired tire
and adjust the tire inflation pressure. The
tire pressure warning light will go off after a
few minutes.
■Conditions that the tire pressure warn-
ing system may not function properly
 P.368
■Customization
Some functions can be customized.
(  P.461)
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 br aking, 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
When the light comes on yellow, the
assist to the power st eering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.

4327-2. Steps to take in an emergency
1Insert the mechanical key while
pulling on the driver’s door handle.
2 Unlock the door.
Turning the key rearward unlocks the
driver’s door. Turning the key again unlocks
the other doors.
3Remove the key, return the handle,
and then pull the handle again.
■Locking the door
1 With the door open, push down the
inside lock button.
2 Close the door.
■Key linked functions
1 Closes the windows and the moon
roof
* or panoramic moon roof* (turn
and hold)
2 Opens the windows and the moon
roof
* or panoramic moon roof* (turn
and hold)
These settings must be customized at your
Lexus dealer.
*: If equipped
1 Ensure 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.
WARNING
■When using the mechanical key and
operating the power windows or the
moon roof or panoramic moon roof
Operate the power window or the moon
roof or panoramic moon roof after
checking to make sure that there is no
possibility of any passe nger having any of
their body parts caught in the window or
the moon roof or panoramic 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 the moon roof or
panoramic moon roof.
Starting the engine

4357-2. Steps to take in an emergency
7
When trouble arises
6Maintain 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.
■When removing the battery terminals
When the battery terminals are removed,
the information stored in the ECU is
cleared. Before removi ng the battery termi-
nals, contact your Lexus dealer.
■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 the battery is removed or dis-
charged
●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.
●The power back door must be initialized.
(  P.109)
■Replacing the battery
●Use a battery with the same case size as
the previous battery and an equivalent
20 hour rate capacity (20HR) or greater.
• If the sizes differ, the battery cannot be properly secured.
• If the 20 hour rate capacity is low, even if the time period where the vehicle is not
used is a short time, the battery may dis-
charge and the engine may not be able to
start.
●For details, consult your Lexus dealer.
WARNING
■When removing the battery terminals
Always remove the negative (-) terminal
first. If the positive (+) terminal contacts
any metal in the surrounding area when
the positive (+) terminal is removed, a
spark may occur, leading to a fire in addi-
tion to electrical shocks and death or
serious injury.
■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:

4468-1. Specifications
*: The coolant capacity is a reference quantity.If replacement is necessary, contact your Lexus dealer.
Cooling system
Capacity*
RX350 (Vehicles without towing package)
9.5 qt. (9.0 L, 7.9 Imp. qt.)
RX350 (Vehicles with towing package)
10.5 qt. (9.9 L, 8.7 Imp. qt.)
RX350L
13.1 qt. (12.4 L, 11 Imp. qt.)
Coolant type
Use either of the following:
 “Toyota Super Long Life Coolant”
 Similar high-quality ethylene glycol-based non-silicate,
non-amine, non-nitrite, and non-borate coolant with
long-life hybrid orga nic acid technology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO FK20HBR8
Gap0.03 in. (0.8 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):
12.6 V or higher: Fully charged
12.2  12.4 V: Half charged
12.0 V or lower: Discharged
(Turn the engine switch off and turn on the head-
lights for 20 to 30 seconds.)
Charging rates5 A max.

4738-2. Customization
8
Vehicle specifications
■Seat belt reminder (P.403)
■Vehicle customization
●When the smart access system with
push-button start is off, the entry unlock
function 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 Remote Touch. If a setting is
changed using a switch, the changed set-
ting will not be reflected on the Remote
Touch until the engine switch is turned off
and then to IGNITION ON mode.
■Clock settings screen
If the clock adjustment screen is displayed
continuously when attempting to change
the clock settings, the system may be mal-
functioning. Have the vehicle inspected by
your Lexus dealer.
FunctionDefault settingCustomized setting
Vehicle speed linked seat belt
reminder buzzerOnOff——O
ABC

490What to do if... (Troubleshooting)
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.430)
 If you lose your electronic keys, the
risk of vehicle theft increases signifi-
cantly. Contact your Lexus dealer
immediately. ( P.430)
 Is the electronic key battery weak or
depleted? ( P.379)
 Is the engine switch in IGNITION
ON mode?
When locking the doors, turn the engine
switch off. ( P.177)
 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.116)
 Is the child-protector lock set?
The rear door cannot be opened from
inside the vehicle when the lock is set.
Open the rear door from outside and then
unlock the child-protector lock. ( P.102)
 Did you press the engine switch
while firmly depressing the brake
pedal? ( P.174)
 Is the shift lever in P? ( P.174)
 Is the electronic key anywhere
detectable inside the vehicle?
( P.115)
 Is the steering wheel unlocked?
( P.175)
 Is the electronic key battery weak or
depleted?
In this case, the engine can be started in a
temporary way. ( P.432)
 Is the battery discharged?
( P.433)
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 rear door cannot be opened
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

491What 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.179)
It is locked automatically to prevent
theft of the vehicle. ( P.175)
 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.146)
 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.177)
 The seat belt reminder light is flash-
ing
Are the driver and the passengers wearing
the seat belts? ( P.406)
 The parking brake indicator is on
Is the parking brake released? ( P.183)
Depending on the situation, other
types of warning buzzer may also
sound. ( P.403, 412)
 Did anyone inside the vehicle open
a door during setting the alarm?
The sensor detects it and the alarm sounds.
( P.68)
Do one of the following to stop the
alarms:
 Unlock the doors.
 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.412)
 When a warning light turns on or a
warning message is displayed, refer
to P.403, 412.
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
When a problem has occurred
If you have a flat tire

496Alphabetical Index
If the vehicle is trapped in rising water.........................................................................395
If you have a flat tire ....................................416
If you lose your keys.................................430
If you think something is wrong .......... 401
If your vehicle becomes stuck............. 439
If your vehicle has to be stopped in an
emergency ................................................ 394
If your vehicle needs to be towed ..... 397
If your vehicle overheats ........................ 437
Engine ACCESSORY mode ............................... 177
Compartment .............................................359
Engine switch................................................. 174
Fuel pump shut off system .................... 402
Hood................................................................ 357
How to start the engine............................ 174
Identification number ............................... 443
If the engine will not start ....................... 428
If your vehicle has to be stopped in an
emergency ................................................ 394
Ignition switch (engine switch) ............. 174
Overheating................................................. 437
Tachometer ...................................................... 77
Engine coolant Capacity ......................................................... 446
Checking .........................................................361
Preparing and checking before winter.........................................................................280
Engine coolant temperature gauge ........ 77
Engine immobilizer system ........................ 66
Engine oil Capacity ......................................................... 444
Checking .......................................................359
Preparing and checking before winter.........................................................................280
Warning light ...............................................404
Engine oil maintenance data ....................361
Engine switch .................................................. 174 Auto power off function ........................... 177
Changing the engine switch modes.. 177 If your vehicle has to be stopped in an
emergency .................................................394
EPS (Electric Power Steering) .............. 275 Warning light .............................................. 405
Event data recorder (E DR) ............................7
F
Flat tire
Tire pressure warning system ............. 367
Vehicles with a spare tire........................ 416
Floor mats .......................................................... 24
Fluid Automatic transmission .......................... 447
Brake ................................................................ 447
Washer ...........................................................364
Fog lights Switch................................................................ 194
Footwell light ................................................. 309
Front automatic air conditioning system .......................................................................... 292
Front fog lights Replacing light bulbs ............................... 385
Front passenger footwell hooks ............ 333
Front passenger occupant classification system .............................................................. 39
Front seats Adjustment ....................................................... 121
Cleaning ......................................................... 347
Correct driving posture ............................ 25
Driving position memory ........................ 133
Head restraints............................................. 136
Memory recall function............................ 135
Power easy access system .................... 133
Seat heaters ................................................. 306
Seat position memory .............................. 133
Seat ventilators ........................................... 306
Front side marker light Light switch ....................................................188
Replacing light bulbs ............................... 385
Front side marker lights Replacing light bulbs ............................... 385
Wattage ..........................................................449