power LEXUS UX250H 2019 Owners Manual

3857-2. Steps to take in an emergency
7
When trouble arises
Fluid leaks under the vehicle
(Water dripping from the air condi-
tioning after use is normal.)
 Flat-looking tires or uneven tire
wear
 Engine coolant temperature gauge
needle continually points higher
than normal
 Changes in exhaust sound
 Excessive tire squeal when corner-
ing
 Strange noises related to the sus-
pension system
 Pinging or other noises related to
the hybrid system
 Engine missing, stumbling or run-
ning roughly
 Appreciable loss of power
 Vehicle pulls heavily to one side
when braking 
Vehicle pulls heavily to one side
when driving on a level road
 Loss of brake effectiveness, spongy
feeling, pedal almost touches the
floor
If you think something is
wrong
If you notice any of the following
symptoms, your vehicle probably
needs adjustment or repair. Con-
tact your Lexus dealer as soon as
possible.
Visible symptoms
Audible symptoms
Operational symptoms

3887-2. Steps to take in an emergency
■SRS warning light (warning buzzer)
■ABS warning light (warning buzzer)
■Electric power steering system warning light (warning buzzer)
■Slip indicator
Warning lightDetails/Actions
Indicates a malfunction in:
The SRS airbag system;
 The front passenger occupant classification system; or
 The seat belt pretensioner system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
(U.S.A.)
or
(Canada)
Indicates a malfunction in:
The ABS; or
 The brake assist system
 Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
(red)
or
(yellow)
Indicates a malfunction in the EPS (Electric Power Steering) system
Have the vehicle inspected by your Lexus dealer immediately.
Warning lightDetails/Actions
Indicates a malfunction in:
The VSC system;
 The TRAC system; or
 The hill-start assist control system
 Have the vehicle inspected by your Lexus dealer immediately.

3907-2. Steps to take in an emergency
■PKSB OFF indicator (warning buzzer)
■Low fuel level warning light
■Driver’s and front passenger’s seat belt reminder light (warning buzzer)*
*: Driver’s seat belt warning buzzer:
The driver’s seat belt warning buzzer sounds to al ert the driver that his or her seat belt is not
fastened. Once the power switch is turned to ON, the buzzer sounds for 6 seconds. If the
vehicle reaches a speed of 12 mph (20 km/h), the buzzer sounds once. If the seat belt is still
unfastened after 24 seco nds, the buzzer will sound intermitte ntly for 6 seconds. Then, if the
seat belt is still unfastened, the buzzer will sound in a different tone for 90 more seconds.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt warning buzzer sounds to alert the front passenger that his
or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches a speed of 12
mph (20 km/h). If the seat belt is still unfastened after 24 seconds, the buzzer will sound
intermittently for 6 seconds. Th en, if the seat belt is still unfastened, the buzzer will sound in
a different tone for 90 more seconds.
Warning lightDetails/Actions
(flashes)
When a buzzer sounds:
Indicates a malfunction in the PK SB (Parking Support Brake) system
 Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.
 Follow the instructions displayed on the multi-information display.
(  P.246)
Warning lightDetails/Actions
Indicates that remaining fuel is approx imately 1.6 gal. (6.0L, 1.3 Imp.gal.)
or less
 Refuel the vehicle.
Warning lightDetails/Actions
Warns the driver and/or front passe nger to fasten their seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front passenger’s seat
belt also needs to be fastened to make the warning light (warning
buzzer) turn off.

3937-2. Steps to take in an emergency
7
When trouble arises
bag sensor assembly, front impact sensors,
side impact sensors (front door), side
impact sensors (front), side impact sensors
(rear), driver’s seat position sensor, driver’s
seat belt buckle switch, front passenger
occupant classification system (ECU and
sensors), rear seat belt buckle switches (if
equipped), “AIR BAG ON” indicator light,
“AIR BAG OFF” indicator light, front pas-
senger’s seat belt buckle switch, seat belt
pretensioners, airbags, interconnecting wir-
ing and power sources. (P.31)
■Electric power steering system warning
light (warning buzzer)
When the 12-volt battery charge becomes
insufficient or the voltage temporarily
drops, the electric po wer steering system
warning light may come on and the warning
buzzer may sound.
■When the tire pressure warning light
comes on
Inspect the tires to check if a tire is punc-
tured.
If a tire is punctured: P.399
If none of the tires are punctured:
Turn the power switch off then turn it to ON.
Check if the tire pressure warning light
comes on or blinks.
If the tire pressure warning light blinks for
approximately 1 minute then stays on
There may be a malfunction in the tire pres-
sure warning system. Have the vehicle
inspected by your Lexus dealer immedi-
ately.
If the tire pressure warning light comes
on
1
After the temperature of the tires has
lowered sufficiently, check the inflation
pressure of each tire and adjust them to
the specified level.
2
If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation pres-
sure of each tire is at the specified level
and perform initialization. ( P.351)
■The tire pressure warning light may
come on due to natural causes
The tire pressure warning light may come
on due to natural causes such as natural air leaks and tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes).
■Conditions that the tire pressure warn-
ing system may not function properly
 P.348
WARNING
■If both the ABS and the brake system
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer.
The vehicle will become extremely
unstable during braking, and the ABS
system may fail, which could cause an
accident resulting in death or serious
injury.
■When the electric power steering
system warning light comes on
When the light comes on yellow, the
assist to the power st eering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.
■If the tire pressure warning light
comes on
Be sure to observe the following precau-
tions.
Failure to do so could cause a loss of
vehicle control and result in death or
serious injury.
●Decelerate to the lowest appropriate
speed as soon as possible. Do not
drive over 50 mph (80 km/h).
●Check and adjust the tire inflation
pressure immediately.

3967-2. Steps to take in an emergency
The warning lights and warning buzzers operate as follows depending on the con-
tent of the message. If a message indicates the need for inspection by a dealer, have
the vehicle inspected by your Lexus dealer immediately.
*: A buzzer sounds the first time a message is shown on the multi-information display.
■Warning messages
The warning messages explained below
may differ from the actual messages
according to operation conditions and vehi-
cle specifications.
■Warning buzzer
In some cases, the bu zzer may not be heard
due to being in a noisy location or audio
sound.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level is low. Check the level
of the engine oil, and add if necessary.
This message may appear if the vehicle is
stopped on a slope. Move the vehicle to a
level surface and check to see if the mes-
sage disappears.
■If “Hybrid System Stopped Steering
Power Low” is displayed
This message is displayed if the hybrid sys-
tem is stopped while driving.
When steering wheel operations are
heavier than usual, gr ip the steering wheel
firmly and operate it using more force than
usual.
■If “Hybrid system overheated Output
power reduced” is displayed
This message may be displayed when driv-
ing under severe operat ing conditions. (For
example, when driving up a long steep hill.)
Handling method: P.410
■If “Traction Battery Needs to be Pro-
tected Refrain From the Use of N Posi-
tion” is displayed
This message may be displayed when the
shift lever is in N.
As the hybrid battery (traction battery) can-
Messages and warnings
Warning lightWarning buzzer*Warning
Sounds
• Indicates an important situation, such as when a system related to drivin g is malfunctioning or
that danger may result if the correction proce-
dure is not performed
• Indicates a situation, such as when damage to the vehicle or danger may result
Comes onor flashesSounds
Indicates an important situation, such as when the
systems shown on the multi-information display
may be malfunctioning
Does not sound
• Indicates a condition, such as malfunction of electrical components, th eir condition, or indi-
cates the need for maintenance
• Indicates a situation, such as when an operation has been performed incorrectly, or indicates
how to perform an operation correctly

3977-2. Steps to take in an emergency
7
When trouble arises
not be charged when the shift lever is in N,
shift the shift lever to P when the vehicle is
stopped.
■If “Traction Battery Needs to be Pro-
tected Shift into P to Restart” is dis-
played
This message is displayed when the hybrid
battery (traction battery) charge has
become extremely low because the shift
lever has been left in N for a certain amount
of time.
When operating the vehicle, shift to P and
restart the hybrid system.
■If “Vehicle May Roll Shift to P” or “Shift
to P before exiting vehicle” is shown
Message is displayed when the driver’s
door is opened with out turning the power
switch off with the shift lever in any position
other than P.
Shift the shift lever to P.
■If “Shift is in N Release accelerator
before shifting” is displayed
The accelerator pedal has been depressed
when the shift lever is in N.
Release the accelerator pedal and shift the
shift lever to D, S or R.
■If “Press brake when vehicle is stopped
Hybrid system may overheat” is dis-
played
The message may be displayed when the
accelerator pedal is depressed to hold the
vehicle while the vehicle is stopped on an
incline, etc. The hybrid system may over-
heat. Release the accelerator pedal and
depress the brake pedal.
■If “Auto Power Off to Conserve Battery”
is displayed
Power was turned off due to the automatic
power off function. Next time when starting
the hybrid system, operate the hybrid sys-
tem for approximately 5 minutes to
recharge the 12-volt battery.
■If “High Power Cons umption Power to
Climate Temporarily Limited” is dis-
played
Turn off unnecessary electronic equipment
to reduce power consumption. Please wait until the power supply returns to
normal.
■If “Headlight System Malfunction Visit
Your Dealer” is displayed
The following systems may be malfunction-
ing. Have the vehicle inspected by your
Lexus dealer immediately.
●The LED headlight system
●AFS (Adaptive Front-lighting System) (if
equipped)
●The automatic headlight leveling system
(if equipped)
●Automatic High Beam
■If “Radar Cruise Control Unavailable” is
shown
The dynamic radar cruise control with full-
speed range system cannot be used tempo-
rarily. Use the system when it becomes
available again.
■If “Front Camera Unav ailable” or “Front
Camera Unavailable See Owner’s
Manual” is displayed
The following systems may be suspended
until the problem shown in the message is
resolved. ( P.196, 392)
●PCS (Pre-Collision System)
●LTA (Lane Tracing Assist)
●Automatic High Beam
●RSA (Road Sign Assist) (if equipped)
●Dynamic radar cruise control with full-
speed range
■If “AWD System Overheated Switching
to 2WD Mode” or “AWD System Over-
heated 2WD Mode Engaged” is shown
on the multi-information display (AWD
models)
This message may be displayed when high
load driving is continued. ( P.259)
■If “Maintenance Required Soon” is dis-
played
Indicates that all maintenance according to
the driven distance on the maintenance
schedule
* should be performed soon.
Comes on approximately 4500 miles
(7200 km) after the message has been

3987-2. Steps to take in an emergency
reset. If necessary, perform maintenance.
Please reset the message after the mainte-
nance is performed. (P.328)
*: Refer to the separa te “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Maintenance Required Visit Your
Dealer” is displayed
Indicates that all maintenance is required to
correspond to the driven distance on the
maintenance schedule
*.
Comes on approximately 5000 miles
(8000 km) after the message has been
reset. (The indicator will not work properly
unless the message ha s been reset.) Per-
form the necessary maintenance. Please
reset the message after the maintenance is
performed. ( P.328)
*: Refer to the separa te “Scheduled Main-
tenance” or “Owner’s Manual Supple-
ment” for the maintenance interval
applicable to your vehicle.
■If “Oil Maintenance Required Soon” is
displayed
Indicates that the engine oil should be
scheduled to be changed.
Check the engine oil and change it if neces-
sary. After changing the engine oil, make
sure to reset the message. ( P.339)
■If “Oil Maintenance Required” is dis-
played
Indicates that the engine oil should be
changed.
Check and change the en gine oil, and oil fil-
ter by your Lexus deal er. After changing the
engine oil, make sure to reset the message.
(  P.339)
■If a message that in dicates the need for
visiting your Lexus dealer is displayed
The system or part shown on the multi-
information display is malfunctioning. Have
the vehicle inspected by your Lexus dealer
immediately.
■If a message that indicates the need for
referring to Owner’ s Manual is dis-
played
●If any of the following messages are
shown on the multi-information display,
follow the instructions.
• “Engine Coolant Temp High” ( P.410)
• “Front Camera Unavailable” ( P.196)
• “Radar Cruise Control Unavailable” ( P.196)
●If any of the following messages are
shown on the multi-info rmation display, it
may indicate a malf unction. Have the
vehicle inspected by your Lexus dealer
immediately.
• “Access System with Elec. Key Malfunc-
tion”
• “Hybrid system malfunction”
•“Check Engine”
• “Hybrid battery system malfunction”
• “Accelerator system malfunction”
●If any of the following messages are
shown on the multi-info rmation display, it
may indicate a malfun ction. Immediately
stop the vehicle and contact your Lexus
dealer.
• “Braking Power Low”
• “Charging System Malfunction”
• “Oil Pressure Low”
●If “Low Auxiliary Battery See Owner’s
Manual” is shown
• When the display goes off after several
seconds
*:
Maintain the hybrid system operation for
more than 15 minutes and charge the 12-
volt battery.
• When the display does not go off:
Start up the hybrid system using the proce-
dures for “If the 12-volt battery is dis-
charged” ( P.405)
*: Displays for about 6 seconds
●If “Maintenance required for Traction bat-
tery cooling parts See owner’s manual” is
shown, the filter may be clogged, the air
intake vent may be blocked, or there may
be a gap in the duct. Therefore, perform
the following correction procedure.
• If the air intake vent and filter of the hybrid battery (traction battery) are dirty, per-

3997-2. Steps to take in an emergency
7
When trouble arises
form the procedure on P.365 to clean
them.
• If the warning message is shown when
the air intake vent and filter of the hybrid
battery (traction battery) are not dirty,
have the vehicle inspected by your Lexus
dealer.
Take your vehicle to the nearest Lexus
dealer or authorized tire dealer as
soon as possible if any tire goes flat.
The vehicle can be driven for a maximum
of 100 miles (160 km) at a speed below 50
mph (80 km/h) after the tire pressure
warning light comes on. ( P.387)
A run-flat tire has a mark on the
side wall.
■In some condition (such as at high tem-
peratures)
You cannot continue dr iving for up to 100
miles (160 km).
■For the detailed information on run-flat
tires
 P.347
NOTICE
■If “High Power Consumption Power
to Climate Temporarily Limited” is
displayed frequently
There is a possible malfunction relating
to the charging system or the 12-volt bat-
tery may be deteriorating. Have the vehi-
cle inspected by your Lexus dealer.
■If “Low Auxiliary Battery” is displayed
frequently
The 12-volt battery may have deterio-
rated. As the battery may discharge in
this state when left unattended, have the
battery inspected by your Lexus dealer.
If you have a flat tire
Your vehicle is not equipped with a
spare tire, but instead you can con-
tinue driving the vehicle with run-
flat tires even if any tire goes flat.
In this case, slow down and drive
with extra caution.
Run-flat tires

4017-2. Steps to take in an emergency
7
When trouble arises
of the problem:
The 12-volt battery may be dis-
charged. ( P.405)
 The 12-volt battery terminal con-
nections may be loose or corroded.
( P.342)
One of the following may be the cause
of the problem:
 The 12-volt battery may be dis-
charged. ( P.405)
 One or both of the 12-volt battery
terminals may be disconnected.
( P.342)
Contact your Lexus dealer 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 sys-
tem if the power switch is functioning
normally.
Do not use this starting procedure
except in cases of emergency.
1 Press the parking brake switch to
check that the parking brake is set.
(P.172)
Parking brake indicator will come on.
2 Shift the shift lever to P.
3 Turn the power switch to ACC. 4
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 sys-
tem may be malfunctioning. Have the
vehicle inspected by your Lexus dealer.
The interior lights and head-
lights do not turn on, or the horn
does not sound.
Starting the hybrid system in an
emergency

4047-2. Steps to take in an emergency
1Insert the mechanical key while
pulling on the driver’s door handle.
2
Unlock the door.
3
Remove the key, return the handle,
and then pull the handle again.
■Locking the door
1
With the door open, push down the
inside lock button.
2
Close the door.
■Key linked functions
The opening and closing of the power win-
dows and moon roof can be linked to key
operation by a customized setting. 1
Closes the windows and moon roof
(turn and hold)
2
Opens the windows and moon roof
(turn and hold)
1Ensure that the shift lever is in P and
depress the brake pedal.
2
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 will
turn to ON.
When the smart access system with push-
button start is deactivated in customization
WARNING
■When using the mechanical key and
operating the power windows or
moon roof (if equipped)
Operate the power window or moon
roof after checking to make sure that
there is no possibility of any passenger
having any of their body parts caught in
the window or moon roof.
Also, do not allow children to operate the
mechanical key. It is possible for children
and other passengers to get caught in
the power window or moon roof.
Starting the hybrid system