Page 588 of 640

5888-2. Steps to take in an emergency
RC300h_EE(OM24740E)
The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emergency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to check
that the radiator cooling fans operate and to check for coolant leaks from
the radiator or hoses.
The fans operate when the ai r conditioning system is turned on immediately after a cold start. Confirm that the fans are op erating by checking the fan sound and air flow. If it is difficult to check these, tu rn the air conditioning system on and off
repeatedly. (The fan may not operate in freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
If the fans are operating:
Have the vehicle inspected at the nearest authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
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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.
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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 602 of 640
6029-1. Specifications
RC300h_EE(OM24740E)
*: The fluid capacity is a reference quantity.
If replacement is necessary, contact any authorized Lexus dealer or repairer, or
another duly qualified an d equipped professional.
Electrical system
12-volt battery
Open voltage at 20C (68 F):
12.0 V or higher If the voltage is lower than the standard value, chargethe battery.
(Voltage is checked 20 minutes after the hybrid system and all lights are turned off.)
Charging rates5 A max.
Hybrid transmission
Fluid capacity*3.8 L (4.0 qt., 3.3 Imp. qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■Hybrid transmission fluid type
Using transmission fluid other than “Toy ota Genuine ATF WS” may damage the hybrid
transmission of your vehicle.
Page 603 of 640

603
9
9-1. Specifications
Vehicle specifications
RC300h_EE(OM24740E)
Your Lexus vehicle is filled with “Toyota Ge nuine Differential Gear Oil” at the factory.
Use Lexus approved “Toyota Genuine Differentia l Gear Oil” or an equivalent of match- ing quality to satisfy the abov e specification. Please contact any authorized Lexus dealer or repairer, or another duly qualified an d equipped professional for further details.
*1: Minimum pedal clearance when depressed with a force of 500 N (51.0 kgf, 112.4 lbf)
while the hybrid system is operating.
*2: Parking brake pedal travel when depressed with a force of 300 N (30.6 kgf, 67.4 lbf)
Differential
Oil capacity1.35 L (1.42 qt., 1.19 Imp. qt.)
Oil type and viscosityToyota Genuine Differential gear oil LT 75W-85 GL-5 or equivalent
Brakes
Pedal clearance*1117 mm (4.6 in.) Min.
Pedal free play1.0 — 6.0 mm (0.04 — 0.24 in.)
Parking brake pedal travel*27 - 10 clicks
Fluid typeSAE J1703, FMVSS No.116 DOT 3 or SAE J1704,FMVSS No.116 DOT 4
Page 606 of 640

6069-1. Specifications
RC300h_EE(OM24740E)
■Use of ethanol blended gasoline in a gasoline engine
Lexus allows the use of ethanol blended gasoline where the ethanol content is up to 10%. Make sure that the ethanol blended gasoline to be used has a Research Octane Numberthat follows the above.
■If your engine knocks
●Consult any authorized Lexus dealer or repairer, or another duly qualified andequipped professional.
●You may occasionally notice light knocking for a short time while accelerating or driv-ing uphill. This is normal and there is no need for concern.
Fuel information
EU area:
You must only use unleaded gasoline conforming to European standard
EN228.
Select unleaded gasoline with a Rese arch Octane Number of 95 or higher
for optimum engine performance.
Except EU area:
You must only use unleaded gasoline.
Select unleaded gasoline with a Rese arch Octane Number of 95 or higher
for optimum engine performance.
NOTICE
■Notice on fuel quality
●Do not use improper fuels. If improper fuels are used, the engine will be damaged.
●Do not use leaded gasoline. Leaded gasoline will cause the three-way cata lytic converter to lose its effectiveness and the emission control system to function improperly.
●EU area: Bioethanol fuel sold under names such as “E50” or “E85” and fuel contain- ing a large amount of ethanol should not be used. The use of these fuels will damage the vehicle’s fuel system. In case of any doubt, ask any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
●Except EU area: Bioethanol fuel sold under names such as “E50” or “E85” and fuel containing a large amount of ethanol should not be used. Your vehicle can use gaso-
line mixed with 10% max ethanol. The use of fuel with more than 10% ethanol content (E10) will damage the vehicle’s fuel system. You must ensure that refueling is carried out only from a source where fuel specification and quality can be guaranteed. In case
of any doubt, ask any authorized Lexus deal er or repairer, or another duly qualified and equipped professional.
●Do not use the methanol blended gasoline such as M15, M85, M100. The use of gas-
oline containing methanol may cause engine damage or failure.
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
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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
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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—
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