Page 502 of 620

5027-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
Indicates a malfunction in the drive start control 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 brake override 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 engine oil level is low
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 message disappears.
A buzzer also sounds.
→ Check the level of engine oil, and add if necessary.
Indicates that the hybrid system has overheated
This message may be displayed when driving under
severe operating conditions. (For example, when driv-
ing up a long steep hill.)
A buzzer also sounds.
→ Stop and check. ( →P. 5 5 6 )
Wa r n i n g m e s s a g eDetails/Actions
Page 504 of 620

5047-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
(If equipped)
Indicates that the tire inflation pressure is low
→Check the tire inflation pressure, and adjust to the
appropriate level.
(If equipped)
Indicates a malfunction in th e tire pressure warning sys-
tem
→ Stop the vehicle in a safe place and turn the power
switch off then on again. If the tire pressure warning
indicator flashes for 1 minute then illuminates, there
is a malfunction in the system. Have the vehicle
inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped
professional.
(If equipped)
Indicates that the tire position information cannot be rec-
ognized
→Drive for a short while an d check if the display
updates.
If the radio wave conditions improve, the display
may return to normal. If the tire pressure is still not
displayed after driving for several minutes, stop the
vehicle in a safe place, turn the power switch off
then on again, and start driving. If the tire pressure is
still not displayed even after repeating this process
several times, have the vehicle inspected by any
authorized
Lexus dealer or repairer, or another duly qualified
and equipped professional.
Wa r n i n g m e s s a g eDetails/Actions
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5077-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
(If equipped)
Indicates that the PCS (Pre-Crash Safety system) is tem-
porarily unavailableA buzzer also sounds.
→ When conditions improve, the system resumes
operation. If this item is displayed continuously, have
the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
Air conditioning, heater and other operations are tem-
porarily limited due to high power consumption
→ Turn off unnecessary electronic equipment to
reduce power consumption.
Please wait until the power supply returns to nor-
mal.
If this item is frequently displayed, have the vehicle
inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped
professional.
(If equipped)
Indicates that part of the PCS (Pre-Crash Safety system)
sensor is dirty, covered with ice, etc.
A buzzer also sounds.
→ Remove any dirt, ice, etc.
Wa r n i n g m e s s a g eDetails/Actions
(Flashes)
(Flashes)
(Flashes)
Page 508 of 620
5087-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
Carrying out the corresponding action turns the messages off.
Other displayed messages
Wa r n i n g m e s s a g eDetails/Actions
Maintenance of the hybrid battery (traction battery)
cooling component is requiredThe filter may be clogged, the air intake vent may be
blocked or there may be a gap in the duct.
→ Have maintenance performed on the hybrid battery
(traction battery) cooling component at any autho-
rized Lexus dealer or repairer, or another duly qual-
ified and equipped professional.
Page 510 of 620
5107-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
*: For the EV drive mode operating conditions (→P. 222).
Wa r n i n g m e s s a g eDetails/Actions
Indicates that the EV drive mode has been automatically
canceled*
The reason the EV drive mode is not available (the
battery charge is low, speed is higher than the EV
drive mode operating speed range, accelerator pedal
is depressed too much) may be displayed.
A buzzer also sounds.
→ Drive the vehicle for a while.
(Flashes)
Page 511 of 620

5117-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
■Warning message in radar cruise mode (if equipped)
In the following cases, the warning message may not be displayed even if vehicle-to-vehi-
cle 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
■Open door warning message
The open door warning message continues to display until a door or the trunk is fully
closed, even if the power switch is turned off. However, approximately 20 minutes after a
door or the trunk is not fully closed, the 12-volt battery-saving function operates and the
display turns off even though a door or the trunk is not fully closed.
■Warning buzzer
In some cases, the buzzer may not be heard because of noisy place or an audio sound.
Page 512 of 620

5127-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
InteriorbuzzerExteriorbuzzerWarning messageDetails/Actions
Once
The electronic key is not detected
when an attempt is made to start the
hybrid system.
→ Start the hybrid system with the
electronic key present.
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 power 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 power switch was not
turned off.
→Turn the power switch off or
bring the electronic key back
into the vehicle.
OnceCon-
tinuous
An attempt was made to exit the
vehicle with the electronic key and
lock the doors without first turning
the power switch off when the shift
lever was in P.
→Turn the power switch off and
lock the doors again.
(Flashes)
(Flashes)
(Displayed alternately)
(Flashes)
Page 513 of 620
5137-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
9
times
An attempt was made to drive when
the regular key was not inside the
vehicle.
→Confirm that the electronic key
is inside the vehicle.
Con-
tinuous
The driver’s door was opened when
the shift lever was not in P and the
power 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 power switch was
not turned off.
→Shift the shift lever to P.
→ Bring the electronic key back
into the vehicle.
Interior
buzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)
(Flashes)
(Displayed alternately)
(Flashes)