Page 537 of 640

5378-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
If a warning light turns on or a warning buzzer
sounds
Calmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, but then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by any authorized Lexus dealer or repairer, or
another duly qualified an d equipped professional.
Warning light and warning buzzer list
Warning lightWarning light/Details/Actions
Brake system warning light (warning buzzer) Indicates that:
• The brake fluid level is low; or • The brake system is malfunctioningThis light also comes on when the parking brake is not released. If
the light turns off after the parking brake is fully released the system is operating normally. Immediately stop the vehicle in a safe place and contact any
authorized Lexus dealer or repairer, or another duly qualified and equipped professional. Continuing to drive the vehicle maybe dangerous.
Brake system warning lightIndicates a malfunction in:• The regenerative braking system; or
• The electronically controlled brake system Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and equipped professional
immediately.
Charging system warning light Indicates a malfunction in the vehicle’s charging system Immediately stop the vehicle in a safe place and contact any
authorized Lexus dealer or repairer, or another duly qualified and equipped professional.
Malfunction indicator lampIndicates a malfunction in:
• The hybrid system; • The emission control system (if equipped);• The electronic engine control system; or
• The electronic throttle control system Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and equipped professional
immediately.
Page 545 of 640
5458-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
Indicates a malfunction in the Lexus parking assist-sen-
sor A buzzer also sounds. Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
Indicates that a Lexus parking assist-sensor is dirty or
covered with ice A buzzer also sounds. Clean the sensor.
Indicates that the accelerator pedal is depressed while the shift position is in NA buzzer also sounds.
Release the accelerator pedal and shift the shift lever to D, S or R.
Indicates that the accelerator pedal is depressed to stopthe vehicle on an upward slope, etc.
A buzzer also sounds. Release the accelerator pedal and depress the brake pedal.
Warning messageDetails/Actions
(Flashes)
(Flashes)
Page 547 of 640
5478-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
Indicates that the vehicle is being driven at 5 km/h (3 mph) or more with the parking brake still engaged
A buzzer also sounds. Release the parking brake.
Indicates a malfunction in: • The SRS airbag system; or• The seat belt pretensioner system
A buzzer also sounds. Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
Indicates a malfunction in: •The ABS; or• The brake assist system
A buzzer also sounds. Have the vehicle inspected by any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
Indicates that the engine coolant temperature is too high
A buzzer also sounds. P. 587
(If equipped)
Indicates that the radar sensor is dirty or covered with ice
A buzzer also sounds. Clean the sensor.
Warning messageDetails/Actions
(Flashes)
Page 564 of 640

5648-2. Steps to take in an emergency
RC300h_EE(OM24740E)
●Stop the vehicle in a safe place on a hard, flat surface.
●Set the parking brake.
●Shift the shift lever to P.
●Stop the hybrid system.
●Turn on the emergency flashers. (P. 528)
●Check the degree of the tire damage.
A tire should only be repaired with
the emergency tire puncture repair
kit if the damage is caused by a nail
or screw passing through the tire
tread.
• Do not remove the nail or screw
from the tire. Removing the
object may widen the opening
and disenable emergency repair
with the kit.
• To avoid sealant leakage, move the vehicle until the area of the puncture, if
known, is positioned at the top of the tire.
■A flat tire that cannot be repaired with the emergency tire puncture repair kit
In the following cases, the tire cannot be repaired with the emergency tire puncture
repair kit. Contact any authorized Lexus dealer or repairer, or another duly qualified and equipped professional.
●When the tire is damaged due to driving without sufficient air pressure
●When the tire lost air pressure due to a crack or damage in the tire sidewall
●When the tire is visibly separated from the wheel
●When the cut or damage to the tread is 4 mm (0.16 in.) long or more
●When the wheel is damaged
●When 2 or more sharp objects, such as nails or screws, have passed through the tread on a single tire
●When there is more than one hole or cut in the damaged tire
●When the sealant has expired
Before repairing the vehicle
Page 577 of 640

5778-2. Steps to take in an emergency
8
When trouble arises
RC300h_EE(OM24740E)
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. (P. 582)
●One or both of the 12-volt battery terminals may be disconnected. (P. 481)
Contact any authorized Lexus dealer or repairer, or another duly qualified and equipped professional if the problem cannot be repaired, or if repair procedures are unknown.
When the hybrid system does not start, the following steps can be used as an
interim measure to start the hybrid system if the power switch is functioning nor-
mally.
Do not use this starting procedur e except in case of emergency.
Set the parking brake.
Shift the shift lever to P.
Turn the power switch to ACCESSORY mode.
Press and hold the power switch for about 15 seconds while depressing the
brake pedal firmly.
Even if the hybrid system can be started using the above steps, the system may
be malfunctioning. Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
The interior lights and headlights do not turn on, or the horn does not
sound.
Emergency start function
1
2
3
4
Page 592 of 640
5928-2. Steps to take in an emergency
RC300h_EE(OM24740E)
Stop the hybrid system. Set the parking brake and shift the shift lever to P.
Remove the mud, snow or sand from around the rear wheels.
Place wood, stones or some other material under the rear wheels to help pro-
vide traction.
Restart the hybrid system.
Shift the shift lever to D or R and rele ase the parking brake. Then, while exer-
cising caution, depress the accelerator pedal.
■When it is difficult to free the vehicle
If the vehicle becomes stuck
Carry out the following procedures if the tires spin or the vehicle becomes
stuck in mud, dirt or snow:
Press to turn off TRC.
1
2
3
4
5
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 616 of 640

6169-2. Customization
RC300h_EE(OM24740E)
■Vehicle customization
●When the speed-detecting automatic door lock and shift-linked automatic door lock are both on, the door lock operates as follows.
• When shifting the shift lever to any position other than P, both side the doors will be
locked. • If the vehicle is started with both side doors locked, the speed-detecting automaticdoor lock will not operate.
• If the vehicle is started with any door unlocked, the speed-detecting automatic door lock will operate.
●When the smart entry & start system is off, the entry unlock function cannot be custom-ized.
●When the doors remain closed after unlocking the doors and the timer activated auto-
matic door lock function activates, signals will be generated in accordance with the operational signal (Emergency flashers) function setting.
●Some settings can be changed using a switch or the audio system screen. If a setting is
changed using a switch, the changed setting will not be reflected on the audio system screen until the power switch is turned off and then to ON mode.
■When customizing using the Remote Touch or Lexus Display Audio controller
Stop the vehicle in a safe place, apply the parking brake, and shift the shift lever to P. Also, to prevent 12-volt battery discharge, leave the hybrid system operating while customiz-ing the features.
WARNING
■During customization
As the hybrid system needs to be operating during customization, ensure that the vehi- cle is parked in a place with adequate ventilation. In a closed area such as a garage,exhaust gases including harmful carbon monoxide (CO) may collect and enter the
vehicle. This may lead to death or a serious health hazard.
NOTICE
■During customization
To prevent 12-volt battery discharge, ensure that the hybrid system is operating while customizing features.