LEXUS RX450h 2015 Owners Manual

7405-2. Steps to take in an emergency
●
If non-genuine Lexus wheels are used (Even if you use Lexus wheels, the tire
pressure warning system may not work properly with some types of tires.)●
If tire chains are used●
Vehicles with a full-size spare tire: If the spare tire is in a location subject to poor
radio wave signal reception●
Vehicles with a full-size spare tire: If a large metallic object which can interfere
with signal reception is pu t in the luggage compartment■
If the tire pressure warning light freque ntly comes on after blinking for 1 minute
If the tire pressure warning light frequently comes on after blinking for 1 minute
when the “POWER” switch is turned to ON mode, have it checked by your Lexus
dealer.■
Customization
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features  P. 825)
CAUTION■
When the electric power steering system warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate using more force than usual.■
If the tire pressure warning light comes on
Be sure to observe the following precautions. Failure to do so could cause loss of
vehicle control and result in death or serious injury. ●
Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
sure immediately.●
If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If a tire is flat, change
it with the spare tire and have the flat tire repaired by the nearest Lexus dealer.
●
Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes.
■
If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.

5
When trouble arises
7415-2. Steps to take in an emergency
CAUTION■
Maintenance of the tires
Each tire, including the spare (if provided ), should be checked monthly when cold
and inflated to the inflation pressure re commended by the vehicle manufacturer on
the vehicle placard or tire inflation pressure label (tire and load information label).
(If your vehicle has tires of a different size than the size indicated on the vehicle
placard or tire inflation pressure label [t ire and load information label], you should
determine the proper tire inflation pressure for those tires.)
As an added safety feature, your vehicl e has been equipped with a tire pressure
monitoring system (TPMS-tire pressure wa rning system) that illuminates a low tire
pressure telltale (tire pressure warning light) when one or more of your tires is sig-
nificantly under-inflated. Accordingly, when the low tire pressure telltale (tire pres-
sure warning light) illuminates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat an d can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling
and stopping ability.
Please note that the TPMS (tire pressure warning system) is not a substitute for
proper tire maintenance, and it is the driver's responsibility to maintain correct tire
pressure, even if under-inflation has not reached the level to trigger illumination of
the TPMS low tire pressure telltale (tire pressure warning light).
Your vehicle has also been equipped with a TPMS (tire pressure warning system)
malfunction indicator to indicate when th e system is not operating properly. The
TPMS (tire pressure warning system) malf unction indicator is combined with the
low tire pressure telltale (tire pressure warning light). When the system detects a
malfunction, the telltale will flash for approximately one minute and then remain
continuously illuminated. This sequence will continue upon subsequent vehicle
start-ups as long as the malfunction exists . When the malfunction indicator is illumi-
nated, the system may not be able to detect or signal low tire pressure as intended.
TPMS (tire pressure warning system) malfunctions may occur for a variety of rea-
sons, including the installation of replacem ent or alternate tires or wheels on the
vehicle that prevent the TPMS (tire pressure warning system) from functioning
properly. Always check the TPMS (tire pressure warning system) malfunction tell-
tale after replacing one or more tires or wheels on your vehicle to ensure that the
replacement or alternate tires and wheels allow the TPMS (tire pressure warning
system) to continue to function properly.

7425-2. Steps to take in an emergency
NOTICE■
To ensure the tire pressure warning system operates properly
Do not install tires with different specificat ions or makers, as the tire pressure warn-
ing system may not operate properly.

5
When trouble arises
7435-2. Steps to take in an emergency
If a warning message is displayed
Stop the vehicle immediately. Continuing to drive the vehicle may be dangerous.
The following warning in dicates a possible problem in the brake system.
Immediately stop the vehi cle in a safe place and contact your Lexus
dealer.
Wa r n i n g m e s s a g e Details
(U.S.A.)

(Canada) Indicates the following:
• The brake fluid level is low; or,
• The brake system is malfunctioning.
A buzzer also sounds.
Indicates a malfunction in:
• The regenerative brake system; or,
• The electronically controlled brake system
A buzzer also sounds.If a warning is shown on the multi-information display, stay calm and per-
form the following actions:
Master warning light The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the
multi-information display.
Multi-information display
If any of the warning lights comes on again after the following actions
have been performed, contact your Lexus dealer.

7445-2. Steps to take in an emergency
Stop the vehicle immediately.
A buzzer sounds and a warning message is shown on the multi-informa-
tion display. The following warning indicates the possibility of damage to
the vehicle that may lead to an acci dent. Immediately stop the vehicle in a
safe place and contact your Lexus dealer. Wa r n i n g m e s s a g e Details
(U.S.A.)
(Canada) Indicates abnormal engine oil pressure
The warning light may come on if the engine oil pres-
sure is too low.
Indicates a malfunction in the hybrid system

5
When trouble arises
7455-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
A buzzer sounds and a warning message is shown on th e multi-informa-
tion display. Failure to investigate the cause of the fo llowing warnings may
lead to the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer immediately. Wa r n i n g m e s s a g e Details
(AWD models) Indicates a malfunction in the AWD system
Indicates a malfunction in the steering lock system
(Flashes)
(If equipped) Indicates a malfunction in the LED headlight system
Indicates a malfunction in the brake lights system

7465-2. Steps to take in an emergency
(Flashes)
(If equipped) Indicates a malfunction in the pre-collision system
(If equipped) Indicates a malfunction in the intuitive parking assist
The malfunctioning assi st-sensor is flashing.
Indicates a malfunction in the cruise control system
or the radar cruise control system (If equipped)
Press the “ON-OFF” button once to deactivate the
system, and then press the button again to reactivate
the system.
(If equipped) Indicates a malfunction in the automatic headlight
leveling systemWa r n i n g m e s s a g e Details

5
When trouble arises
7475-2. Steps to take in an emergency
Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system;
or,
• The seat belt pretensioner system
Indicates a malfunction in:
• The ABS; or,
• The brake assist system
Indicates a malfunction in the EPS (Electric Power
Steering) system
(If equipped) Indicates a malfunction in the Blind Spot Monitor.Wa r n i n g m e s s a g e Details

7485-2. Steps to take in an emergency
Follow the correction procedures.
A buzzer sounds and a warning message is shown on the multi-informa-
tion display. After taking the spec ified steps to correct the suspected
problem, check that the warning message goes off. Wa r n i n g m e s s a g e Details Correction procedure
Indicates that one or
more of the doors is not
fully closed
The system also indi-
cates which doors are
not fully closed.
If the vehicle reaches a
speed of 3 mph
(5 km/h), a buzzer
sounds to indicate that
the door(s) are not yet
fully closed. Make sure that all the
doors are closed.
Indicates that the hood is
not fully closed
If the vehicle reaches a
speed of 3 mph
(5 km/h), a buzzer
sounds to indicate that
the hood is not yet fully
closed. Close the hood.

5
When trouble arises
7495-2. Steps to take in an emergency
Indicates that the back
door is not fully closed
If the vehicle reaches a
speed of 3 mph
(5 km/h), a buzzer
sounds to indicate that
the back door is not yet
fully closed. Close the back door.
(Flashes)
(If equipped) Indicates that the moon
roof is not fully closed
(with the “POWER”
switch off, and the driver's
door open) Close the moon roof.
Indicates that the parking
brake is still engaged
If the vehicle reaches a
speed of 3 mph
(5 km/h),
flashes and a buzzer
sounds to indicate that
the parking brake is still
engaged. Release the parking
brake.
Indicates that the washer
fluid level is low Add washer fluid.Wa r n i n g m e s s a g e Details Correction procedure