warning Lexus IS250 2014 Repair Manual

4808-2. Steps to take in an emergency
IS250_EE(OM53C51E)
■If the tire pressure warning light frequently comes on after blinking for 1 minute (if
equipped)
If the tire pressure warning light frequently comes on after blinking for 1 minute when the
engine switch is turned to IGNITION ON mode, have it checked by any authorized
Lexus dealer or repairer, or another duly qualified and equipped professional.
■Warning buzzer
In some cases, the buzzer may not be heard due to being in a noisy location or audio
sound.
CAUTION
■If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact any authorized Lexus dealer
or repairer, or another duly qualified and equipped professional. 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
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and oper-
ate using more force than usual.
■If the tire pressure warning light comes on (if equipped)
Be sure to observe the following precautions. Failure to do so could cause a loss of
vehicle control and result in death or serious injury.
XVehicles with a compact spare tire
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pressure
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 authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could lose
control of the steering wheel or the brakes.
XVehicles with an emergency tire puncture repair kit
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pressure
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, repair the
flat tire by using emergency tire puncture repair kit.
●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.

4818-2. Steps to take in an emergency
8
When trouble arises
IS250_EE(OM53C51E)
NOTICE
■To ensure the tire pressure warning system operates properly
Do not install tires with different specifications or makers, as the tire pressure warning
system may not operate properly.

4828-2. Steps to take in an emergency
IS250_EE(OM53C51E)
Master warning light
The master warning light also comes on or flashes in order to indicate that a message
is currently being displayed on the multi-information display.
Multi-information display
If any of the warning lights come on again after the following actions have been
performed, contact any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional.
If a warning message is displayed
If a warning is shown on the multi-information display, stay calm and perform
the following actions:
XExcept F SPORT modelsXF SPORT models (when the main
meter is in the center position)
XF SPORT models (when the main
meter is in the right-side position)
1
2

4838-2. Steps to take in an emergency
8
When trouble arises
IS250_EE(OM53C51E)
Warning message and warning buzzer list
Wa r n i n g m e s s a g eDetails/Actions
(If equipped)
Indicates that:
• There is a high possibility of a frontal collision; or
• The pre-crash braking function is operating
A buzzer also sounds.
→Slow the vehicle by applying the brakes.
Indicates that the engine was stopped with the shift lever
not in P
A buzzer also sounds.
→Shift the shift lever to P.
Indicates that the engine was stopped while driving
A buzzer also sounds.
→Stop the vehicle in a safe place such as the shoulder
of a road.
(If equipped)
Indicates that your vehicle is nearing the vehicle ahead
(in vehicle-to-vehicle distance mode)
A buzzer also sounds.
→Slow the vehicle by applying the brakes.
(If equipped)
Alerts the driver that the vehicle has deviated from the
lane (while the LDA [Lane Departure Alert] system is
operating)
The lane line on the side the vehicle has deviated from
flashes in yellow.
The warning buzzer sounds continuously.
→Check around the vehicle and back to inside of the
lane lines.
(Flashes)
(Flashes)
(Flashes)

4908-2. Steps to take in an emergency
IS250_EE(OM53C51E)
■Warning messages
The warning message illustrations used are intended as examples, and may differ from
the image that is actually displayed on the multi-information display.
■Warning message in radar cruise mode (if equipped)
In the following situations, the warning message may not be displayed even if vehicle-to-
vehicle distance decreases:
●When your vehicle and the vehicle ahead are traveling at the same speed or the vehicle
ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
■The LDA (Lane Departure Alert) lane departure warning function (if equipped)
In the following situations, the warning message will not be displayed even if a lane line is
crossed.
●When the vehicle speed deviates from the operating range of the LDA system func-
tions
●When the lane lines cannot be recognized
■Conditions that the tire pressure warning system may not function properly (if
equipped)
→P. 4 3 1
■Warning buzzer
→P. 4 8 0
(If equipped)
Indicates that the PCS (Pre-Crash Safety system) is not
currently functional because the grille cover or the sen-
sor is dirty
→Check the grille cover and the sensor and clean
them if they are dirty.
Indicates that operation of large electricity consuming
systems such as the air conditioning system are sus-
pended
→Stop using unnecessary electric components to
reduce electricity consumption. Wait a while until
the electric power supply is restored.
(If equipped)
Indicates that the LDA (Lane Departure Alert) system
cannot be used because the vehicle speed is lower than
approximately 50 km/h (32 mph)
→Drive the vehicle at 50 km/h (32 mph) or higher.
Wa r n i n g m e s s a g eDetails/Actions
(Flashes)

4918-2. Steps to take in an emergency
8
When trouble arises
IS250_EE(OM53C51E)
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
Con-
tinuousThe driver’s door was opened when
the shift lever was not in P and the
engine switch was not turned off.
→Shift the shift lever to P.
Con-
tinuousCon-
tinuous
The driver’s door was opened and
closed while the electronic key was
not in the vehicle, the shift lever was
not in P and the engine switch was
not turned off.
→Shift the shift lever to P.
→Bring the electronic key back
into the vehicle.
Once
The electronic key is not detected
when an attempt is made to start the
engine.
→Start the engine with the elec-
tronic key present.
OnceCon-
tinuous
An attempt was made to exit the
vehicle with the electronic key and
lock the doors without first turning
the engine switch off when the shift
lever was in P.
→Turn the engine switch off and
lock the doors again.
(Flashes)
(Displayed alternately)
(Flashes)
(Flashes)
(Displayed alternately)
(Flashes)

4928-2. Steps to take in an emergency
IS250_EE(OM53C51E)
Once3 times
The electronic key was carried out-
side the vehicle and a door other
than the driver’s door was opened
and closed while the engine switch
was in a mode other than off.
→Bring the electronic key back
into the vehicle.
The driver’s door was opened and
closed while the electronic key was
not in the vehicle, the shift lever was
in P and the engine switch was not
turned off.
→Turn the engine switch off.
→Bring the electronic key back
into the vehicle.
9 times
An attempt was made to drive when
the electronic key was not inside the
vehicle.
→Confirm that the electronic key
is inside the vehicle.
Con-
tinuous
An attempt was made to lock the
doors using the smart entry & start
system while the electronic key was
still inside the vehicle.
→Retrieve the electronic key
from the vehicle and lock the
doors again.
OnceCon-
tinuous
An attempt was made to lock either
front door by opening a door and
putting the inside lock button into
the lock position, then closing the
door by pulling on the outside door
handle with the electronic key still
inside the vehicle.
→Retrieve the electronic key
from the vehicle and lock the
doors again.
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)
(Vehicles with the entry function)
(Flashes)

4938-2. Steps to take in an emergency
8
When trouble arises
IS250_EE(OM53C51E)
Once
The electronic key has a low battery.
→Replace the electronic key bat-
tery. (→P. 4 4 2 )
Once
The steering lock could not be
released within 3 seconds of the
engine switch being pressed.
→Press the engine switch while
depressing the brake pedal and
moving the steering wheel left
and right.
Once
Indicates a malfunction in the smart
entry & start system
→Have the vehicle inspected by
any authorized Lexus dealer or
repairer, or another duly quali-
fied and equipped professional.
Once
• When the doors were unlocked
with the mechanical key and then
the engine switch was pressed,
the electronic key could not be
detected in the vehicle.
• The electronic key could not be
detected in the vehicle even after
the engine switch was pressed
two consecutive times.
→Touch the electronic key to the
engine switch while depressing
the brake pedal.
Once
During an engine starting procedure
in the event that the electronic key
was not functioning properly (→P.
525), the engine switch was touched
with the electronic key.
→Press the engine switch within
10 seconds of the buzzer sound-
ing.
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)

4948-2. Steps to take in an emergency
IS250_EE(OM53C51E)

Indicates that:
• With the engine switch off, the
doors were unlocked and then the
driver’s door was opened and
closed
• The engine switch was turned to
ACCESSORY mode without
starting the engine
• The shift lever was shifted to P or
N from another position with the
engine switch in IGNITION ON
mode.
→Press the engine switch while
depressing the brake pedal.
Once
The engine switch has been turned
off with the shift lever in a position
other than P or N.
→Shift the shift lever to P.
Once
After the engine switch has been
turned off with the shift lever in a
position other than P, the shift lever
has been shifted to P.
→Turn the engine switch off.

Power was turned off due to the
automatic power off function.
→Next time when starting the
engine, increase the engine
speed slightly and maintain that
level for approximately 5 min-
utes to recharge the battery.
Con-
tinuous
Indicates that the engine was
stopped in an emergency while driv-
ing
→To restart the engine, shift the
shift lever to N and turn the
engine switch to IGNITION
ON mode.
*
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Flashes)

4958-2. Steps to take in an emergency
8
When trouble arises
IS250_EE(OM53C51E)
*: The engine may not be restarted depending on the vehicle condition.
■Warning messages
→P. 4 9 0
■Warning buzzer
→P. 4 8 0
Once
Indicates that the engine switch has
been pressed while driving
→Except when emergency stop-
ping of the vehicle is needed,
immediately release the engine
switch.
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)