Page 580 of 640
5808-2. Steps to take in an emergency
RC300h_EE(OM24740E)
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of the
electronic key to the power switch.
When the electronic key is detected, a buzzer sounds and the power switch willturn to ON mode.
When the smart entry & start system is deactivated in customization setting, thepower switch will turn to ACCESSORY
mode.
Firmly depress the brake pedal and check that is shown on the multi-
information display.
Press the power switch.
In the event that the hybrid system still cannot be started, contact any authorized
Lexus dealer or repairer, or another duly qualified and equipped professional.
Starting the hybrid system
1
2
3
4
Page 587 of 640

5878-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
●The hybrid system coolant temperature gauge (P. 115) is in the red zone or
a loss of hybrid system power is experi enced. (For example, the vehicle speed
does not increase.)
●“Engine Coolant High Temperature” or “Hybrid System Overheat Output
Power is limited” is shown on the multi-information display.
●Steam comes out from under the hood.
■If the needle of the engine coolant temperature gauge enters the red zone
or “Engine Coolant High Temperature” is shown on the multi-information
display
Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently, inspect
the hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact any autho- rized Lexus dealer or repairer, oranother duly qualified and
equipped professional.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2
Page 589 of 640
5898-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
■If “Hybrid System Overheat Output Power is limited” is shown on the multi-
information display
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has
cooled down, inspect the hoses
and radiator core (radiator) for
any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact any autho-
rized Lexus dealer or repairer, or
another duly qualified and
equipped professional.
The coolant level is satisfactory if
it is between the “F” and “L” lines
on the reservoir.
Reservoir
“F”
“L”
Add coolant if necessary.
Water can be used in an emergency
if coolant is unavailable.
1
2
3
1
2
4
1
2
3
5
Page 590 of 640

5908-2. Steps to take in an emergency
RC300h_EE(OM24740E)
Start the hybrid system and check for the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
If the message is not displayed:
Have the vehicle inspected at the nearest authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions. Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the “READY” indicator is off.
When the hybrid system operating, the ga soline engine may automatically start, or the cooling fan may suddenly operate even if the gasoline engine stops. Do not touchor approach rotating parts such as the belt and fan, which may lead to fingers or
clothing (especially a tie, a scarf or a mu ffler) getting caught, resulting in serious injury.
6
●Do not loosen the coolant reservoir caps orradiator cap while the hybrid system and radi-
ator are hot. High temperature steam or coolant couldspray out.
Page 600 of 640

6009-1. Specifications
RC300h_EE(OM24740E)
Oil viscosity (0W-20 is explained here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil which allows cold
startability. Oils with a lower value before the W allow for easier starting of
the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the oil when the
oil is at high temperature. An oil with a higher viscosity (one with a higher
value) may be better suited if the vehicle is operated at high speeds, or
under extreme load conditions.
How to read oil container labels:
Either or both API registered marks are added to some oil containers to help
you select the oil you should use.
API Service Symbol
Top portion: “API SERVICE SN” means the oil quality designation byAmerican Petroleum Institute (API).
Center portion: “SAE 0W-20” means the SAE viscosity grade.Lower portion: “Resource-Conserv-
ing” means that the oil has fuel-saving and environmental protection capa-bilities.
ILSAC Certification Mark
The International Lubricant Specificatio n Advisory Committee (ILSAC) Certifica-
tion Mark is displayed on the front of the container.
1
2
Page 607 of 640

607
RC300h_EE(OM24740E)
9
Vehicle specifications
9-2. Customization
■Changing by using the Remote Touch or Lexus Display Audio controller
Vehicles with a Remote Touch
Press the “MENU” button on the Remote Touch.
Select “Setup” on the “Menu” screen and select “Vehicle”.
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 MANUAL”.
Vehicles with a Lexus Display Audio controller
Press the “MENU” button on the Lexus Display Audio controller.
( P. 346)
Select “Setup” on the “MENU” screen and select “Vehicle”.
Various setting can be changed. Refer to the list of settings that can be
changed for details.
■Changing by using the meter control switches
P. 123
Customizable features
Your vehicle includes a variety of electronic features that can be personalized
to your preferences. The settings of th ese features can be changed by using
the meter control switches, the Remote Touch or Lexus Display Audio con-
troller or at any authorized Lexus deal er or repairer, or another duly qualified
and equipped professional.
Customizing vehicle features
1
2
1
2
Page 608 of 640

6089-2. Customization
RC300h_EE(OM24740E)
Some function settings are changed simultaneously with other functions being
customized. Contact any authorized Lexu s dealer or repairer, or another duly
qualified and equipped professional.
Settings that can be changed using the Remote Touch or Lexus Display Audio
controller
Settings that can be changed using the meter control switches
Settings that can be changed by any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional
Definition of symbols: O = Available, — = Not available
■Gauges, meters and multi-information display ( P. 110, 115, 121)
Customizable features
1
2
3
Function*1Default settingCustomized setting
Language*2English
French
—O—
German
Spanish
Italian
Russian
Units*2km (L/100 km)km (km/L)OO—miles (MPG)
EV indicatorON
(Self-lighting)OFF—O—
switch settings*3Drive
information 1Desired status screen
*4—O—
Drive information 1
Current fuel economy
*5—O—Average fuel economy
(after reset)
Drive information 2
Distance
(driving range)
*5—O—Average vehi- cle speed
(after reset)
Pop-up displayONOFF—O—
123
Page 609 of 640

609
9
9-2. Customization
Vehicle specifications
RC300h_EE(OM24740E)
*1: For details about each function: P. 126
*2: The default setting varies according to country.
*3:Except F SPORT models
*4: Some status screens cannot be registered (indicated on multi-information display).
*5: 2 of the following items: current fuel consumption, average fuel economy (after reset),
average fuel economy (after start), average fuel economy (after refuel), average vehi-
cle speed (after reset), average vehicle speed (after start), elapsed time (after reset),
elapsed time (after start), distance (driving range), distance (after start), blank.
*6: F SPORT models
*7: The customized setting varies according to country.
Accent color*3Color 1Color 2OO—
Tachometer settingsON (Self- changing)
Hybrid System Indi-cator (Always)—O—Tachometer
(Always)
Needle*6BlueRed—O—White
Speed indicator*6OFF
50 to 200 km/h*7
—O—50 to 160 km/h (30 to 100 mph)*7
REV indicator*64000 r/min
2000 to 6000 r/min—O—
OFF
REV peak*6ONOFF—O—
Function*1Default settingCustomized setting123