2018 LEXUS RC300 check engine

1893-5. Opening, closing the windows and moon roof
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)WARNING
Observe the following precautions.
Failure to do so may cause death or serious injury. ■
Opening the moon roof ●
Do not allow any passengers to put their hands or heads outside the vehicle while it is
moving. ●
Do not sit on top of the moon roof. ■
Closing the moon roof ●
The driver is responsible for moon roof opening and closing operations.
In order to prevent accidental operation, especially by a child, do not let a child oper-
ate the moon roof. It is possible for child ren and other passengers to have body parts
caught in the moon roof. ●
Check to make sure that all passengers do not have any part of their body in a posi-
tion where it could be caught when the moon roof is being operated. ●
When using the wireless remote control or mechanical key and operating the moon
roof, operate the moon roof af ter checking to make sure th at there is no possibility of
any passenger having any of their body part s caught in the moon roof. Also, do not let
a child operate moon roof by the wireless remote control or mechanical key. It is pos-
sible for children and ot her passengers to get caught in the moon roof.●
When exiting the vehicle, turn the engine sw itch off, carry the ke y and exit the vehicle
along with the child. There may be accidental operation, due to mischief, etc., that
may possibly lead to an accident. ■
Jam protection function ●
Never use any part of your body to intentionally activate the jam protection function. ●
The jam protection function may not work if something gets caught just before the
moon roof is fully closed. Also, the jam prot ection function is not designed to operate
while the moon roof switch is being pressed. Take care so that your fingers, etc. do not
get caught.
NOTICE ■
To prevent damage to the moon roof●
Before opening, make sure that there are no foreign objects such as stones or ice
around the opening. ●
Do not hit the face or edge of the moon roof with hard objects.■
Operating the moon roof
There is the possibility that water or rain will get into the vehicle if you operate the
moon roof after a rainfall, snowfall or car wash. Wipe the moon roof dry with a cloth
before operating it.

1954-1. Before driving
4
Driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury. ■
When starting the vehicle
Always keep your foot on the brake pedal while stopped with the engine running. This
prevents the vehicle from creeping. ■
When driving the vehicle ●
Do not drive if you are unfamiliar with the location of the brake and accelerator ped-
als to avoid depressing the wrong pedal.
• Accidentally depressing the accelerator pedal instead of the brake pedal will
result in sudden acceleration that may lead to an accident.
• When backing up, you may twist your body around, leading to a difficulty in oper-
ating the pedals. Make sure to operate the pedals properly.
• Make sure to keep a correct driving po sture even when moving the vehicle only
slightly. This allows you to depress th e brake and accelerator pedals properly.
• Depress the brake pedal using your right foot. Depressing the brake pedal using
your left foot may delay re sponse in an emergency, resulting in an accident.●
Do not drive the vehicle over or stop the vehicle near flammable materials.
The exhaust system and exhaust gases can be extremely hot. These hot parts may
cause a fire if there is any flammable material nearby. ●
During normal driving, do not turn off the engine. Turning the engi ne off while driving
will not cause loss of steering or braking control, but the power assist to these systems
will be lost. This will make it more difficult to steer and brake, so you should pull over
and stop the vehicle as soon as it is safe to do so.
However, in the event of an emergency, such as if it becomes impossible to stop the
vehicle in the normal way:  P. 443●
Use engine braking (downshift) to maintain a safe speed when driving down a steep
hill.
Using the brakes continuously may cause th e brakes to overheat and lose effective-
ness. (  P. 213)●
Do not adjust the positions of the steering wheel, the seat, or the inside or outside rear
view mirrors while driving.
Doing so may result in a loss of vehicle control. ●
Always check that all passengers’ arms, he ads or other parts of their body are not
outside the vehicle. ●
Do not drive in excess of the speed limit. Even if the legal speed limit permits it, do not
drive over 85 mph (140 km/h) unless your vehicle has high-speed capability tires.
Driving over 85 mph (140 km/h ) may result in tire failure , loss of control and possible
injury. Be sure to consult a tire dealer to determine whether the tires on your vehicle
are high-speed capability tires or no t before driving at such speeds.

196 4-1. Before driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury. ■
When driving on slippery road surfaces ●
Sudden braking, acceleration and steering may cause tire slippage and reduce your
ability to control the vehicle. ●
Sudden acceleration, engine braking due to shifting, or changes in engine speed
could cause the vehicle to skid. ●
After driving through a puddle , lightly depress the brake pe dal to make sure that the
brakes are functioning properly. Wet brake pads may prevent the brakes from func-
tioning properly. If the brakes on only on e side are wet and not functioning properly,
steering control may be affected. ■
When shifting the shift lever ●
Do not let the vehicle roll backward while the shift lever is in a driving position, or roll
forward while the shift lever is in R.
Doing so may cause the engine to stall or lead to poor brake and steering perfor-
mance, resulting in an accide nt or damage to the vehicle.●
Do not shift the shift lever to P while the vehicle is moving.
Doing so can damage the transmission and may result in a loss of vehicle control.●
Do not shift the shift lever to R while the vehicle is moving forward.
Doing so can damage the transmission and may result in a loss of vehicle control.●
Do not shift the shift lever to a driving posi tion while the vehicle is moving backward.
Doing so can damage the transmission and may result in a loss of vehicle control.●
Moving the shift lever to N while the vehicle is moving will disengage the engine from
the transmission. Engine braking is not available when N is selected.●
Be careful not to shift the shift lever with the accelerator pedal depressed. Shifting the
shift lever to a gear other than P or N may lead to unexpected rapid acceleration of
the vehicle that may cause an accident and result in death or serious injury. ■
If you hear a squealing or scraping noise (brake pad wear limi t indicators) (RC350/
RC300)
Have the brake pads checked and replaced by your Lexus dealer as soon as possible.
Rotor damage may result if the pads are not replaced when needed.
Front brakes on F SPORT models (RC3 50 [2WD]/RC300 [2WD] only): Moderate
levels of brake pad and disc wear allow enhanced front braking power. As a result, the
discs may wear more quickly than convention al brake discs. Therefore, when replacing
the brake pads, Lexus recommends that you al so have the thickness of the discs mea-
sured.
It is dangerous to drive the vehicle when the wear limits of the brake pads and/or those
of the brake discs are exceeded.

1974-1. Before driving
4
Driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury. ■
If a brake pad wear warning message is displayed (RC F)
Have the brake pads visually checked and replaced by your Lexus dealer as soon as
possible.
Rotor damage may result if the pads are not replaced when needed.
Moderate levels of the brake pad and disc wear allow enhanced braking power. As a
result, the discs may wear more quickly than conventional brake discs. Therefore, when
replacing the brake pads, Lexu s recommends that you also have the thickness of the
discs measured.
It is dangerous to drive the vehicle when the wear limits of the brake pads and/or those
of the brake discs are exceeded. ■
When the vehicle is stopped ●
Do not race the engine.
If the vehicle is in any gear other than P or N, the vehicle may accelerate suddenly
and unexpectedly, causing an accident. ●
In order to prevent accidents due to the ve hicle rolling away, always keep depressing
the brake pedal while the engine is running, and apply the parking brake as neces-
sary. ●
If the vehicle is stopped on an incline, in order to prevent accidents caused by the
vehicle rolling forward or backward, alwa ys depress the brake pedal and securely
apply the parking brake as needed. ●
Avoid revving or r acing the engine.
Running the engine at high speed while the vehicle is stopped may cause the exhaust
system to overheat, which could result in a fire if combustible material is nearby.

200 4-1. Before driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)NOTICE ■
When driving the vehicle ●
Do not depress the accelerator and brake pedals at the same time while driving, as
this may restrain the engine output.●
Do not use the accelerator pedal or depre ss the accelerator and brake pedals at the
same time to hold the vehicle on a hill. ■
When parking the vehicle
Always set the parking brake, and shift the sh ift lever to P. Failure to do so may cause
the vehicle to move or the vehicle may acce lerate suddenly if th e accelerator pedal is
accidentally depressed. ■
Avoiding damage to vehicle parts ●
Do not turn the steering wheel fully in either direction and hold it there for an
extended period of time.
Doing so may damage the power steering motor. ●
When driving over bumps in the road, drive as slowly as possible to avoid damaging
the wheels, underside of the vehicle, etc. ●
RC300: Make sure to idle the engine immediately after high-load driving. Stop the
engine only after the turb ocharger has cooled down.
Failure to do so may cause damage to the turbocharger. ■
If you get a flat tire while driving
A flat or damaged tire may cause the following situations . Hold the steering wheel
firmly and gradually depress the brake pedal to slow down the vehicle. ●
It may be difficult to control your vehicle. ●
The vehicle will make abnormal sounds or vibrations. ●
The vehicle will lean abnormally.
Information on what to do in case of a flat tire (  P. 489, 502)■
When encountering flooded roads
Do not drive on a road that has flooded af ter heavy rain etc. Doing so may cause the
following serious damage to the vehicle: ●
Engine stalling ●
Short in electrical components ●
Engine damage caused by water immersion
In the event that you drive on a flooded road and the vehicle is flooded, be sure to have
your Lexus dealer check the following: ●
Brake function ●
Changes in quantity and quality of oil and fluid used for the engine, transmission,
transfer (AWD models), differential, etc. ●
Lubricant condition for the propeller shaft, bearings and suspension joints (where
possible), and the function of all joints, bearings, etc.

207
4
Driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 4-2. Driving procedures
Check that the parking brake is set.
Check that the shift lever is in P.
Firmly depress the brake pedal. and a message will be displayed on the multi-information display.
If it is not displayed, th e engine cannot be started.
Press the engine switch shortly and
firmly. When operating the engine switch, one
short, firm press is enough.
It is not necessary to press and hold the
switch.
The engine will crank until it starts or for
up to 30 seconds, whichever is less.
Continue depressing the brake pedal
until the engine is completely started.
The engine can be started from any
engine switch mode.
Stop the vehicle.
Set the parking brake (  P. 222), and shift the shift lever to P.
Press the engine switch.
Release the brake pedal and check that the display on the meters is off.Engine (ignition) switch Performing the following operations wh en carrying the electronic key on your
person starts the engine or changes engine switch modes.
Starting the engine 1
2
3
4
Stopping the engine 1
2
3
4

2094-2. Driving procedures
4
Driving
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
RC F
Off
* The emergency flashers can be used.
The analog speedometer and the
tachometer will not be illuminated.
However, if the welcome illumination is
operating, the analog speedometer will
illuminate.
(Welcome illumination:  P. 101)
ACCESSORY mode Some electrical components such as the
audio system can be used.
The analog speedometer is illuminated.
IGNITION ON mode All electrical components can be used.
The analog speedometer and the
tachometer will be illuminated.
* : If the shift le ver is in a position other than
P when turning off the engine, the
engine switch will be turned to ACCES-
SORY mode, not to off.
If the engine is stopped with the shift le ver in a position other than P, the engine
switch will not be turned off but inst ead be turned to ACCESSORY mode. Per-
form the following procedure to turn the switch off:
Check that the parking brake is set.
Shift the shift lever to P.
Check that “Turn Off Vehicle” is disp layed on the multi-information display
and then press the engine switch once.
Check that “Turn Off Vehicle” on th e multi-information display is off.1
2
3
When stopping the engine with the shift lever in a position other than P1
2
3
4

210 4-2. Driving procedures
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Auto power off function
If the vehicle is left in ACCESSORY mode for more than 20 minutes or IGNITION ON
mode (the engine is not running) for more than an hour with the shift lever in P, the engine
switch will automatically turn off. However, this function cannot entirely prevent battery
discharge. Do not leave the vehicle with the engine switch in ACCESSORY or IGNI-
TION ON mode for long periods of ti me when the engine is not running.■
Electronic key battery depletion
 P. 143 ■
Conditions affe cting operation
 P. 158 ■
Notes for the entry function
 P. 159 ■
If the engine does not start ●
Check that the shift lever is se curely set in P. The engine ma y not start if the shift lever is
displaced out of P. ●
The engine immobilizer system ma y not have been deactivated. (  P. 79)
Contact your Lexus dealer. ■
Steering lock
After turning the engine switch off and opening and closing the doors, the steering wheel
will be locked due to the steering lock func tion. Operating the engine switch again auto-
matically cancels the steering lock. ■
When the steering lock cannot be released
■
Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, operation of the motor may be sus-
pended if the engine is turned on and off repeat edly in a short period of time. In this case,
refrain from operating the engine switch. After about 10 seconds, the steering lock
motor will resume functioning. ■
When “Access System with Elec. Key Malf unction See Owner’s Manual” is displayed
on the multi-information display
The system may be malfunctio ning. Have the vehicle inspected by your Lexus dealer
immediately. ■
If the electronic key battery is depleted
 P. 427“Steering Wheel Lock Press Engine Switch
while Turning Wheel” w ill be displayed on the
multi-information display.
Check that the shift leve r is in P. Press the
engine switch while turn ing the steering wheel
left and right.