Page 437 of 548
4377-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
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)
Page 455 of 548

4557-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
Ensure that the shift lever is in P and depress the brake pedal.
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 mode.
When the smart access system with
push-button start is deactivated in cus-
tomization setting, the power switch will
turn to ACCESSORY mode.
Firmly depress the brake pedal and check that is shown on the multi-
information display.
Press the power switch.
In the event that the hybrid system st ill cannot be started, contact your Lexus
dealer.
■Stopping the hybrid system
Shift the shift lever to P and press the power sw itch as you normally do when stopping the
hybrid system.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic
key battery be replaced immediately when the battery is depleted. ( →P. 382)
■Alarm
If the trunk is opened using the mechanical key when the alarm system is set, the alarm
may be triggered. ( →P. 77)
■Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and modes will be changed each time the switch is
pressed.( →P. 183)
■When the electronic key does not work properly
●Make sure that the smart access system wi th push-button start has not been deacti-
vated in the customization setting. If it is off, turn the function on.
(Customizable features: → P. 494)
●Check if battery-saving mode is set. If it is set, cancel the function. (→P. 136)
Starting the hybrid system
1
2
3
4
3
Page 461 of 548

461
GS450h_OM_OM30G62U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge ( →P. 88) enters the red
zone or a loss of hybrid system power is experienced. (For example, the vehi-
cle speed does not increase.)
●“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” or
“Hybrid System Overheated Reduced Output Power” (→P. 410) is shown on
the multi-information display.
●Steam comes out from under the hood.
■If the needle of the engine coolant temperature gauge enters the red zone
or “Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display
Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has cooled down sufficiently, inspect the hoses and
cooling system for leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2
Page 463 of 548
4637-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
■If “Hybrid System Overheated Reduced Output Power” is shown on the
multi-information displayStop the vehicle in a safe place.
Stop the hybrid system an d carefully lift the hood.
After the hybrid system has cooled down, inspect the hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The coolant level is satisfactory if it is between the “FULL” and “LOW” lines
on the reservoir.
Reservoir
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emergency
if power control unit coolant is
unavailable.
Start the hybrid system and check for the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the nearest Lexus dealer.
1
2
3
1
2
4
1
2
3
5
6
Page 495 of 548
GS450h_OM_OM30G62U_(U)
4958-2. Customization
8
Vehicle specifications
■Meters and multi-information display (→P. 95)
FunctionDefault
settingCustomized setting
Language EnglishFrench
OO —
Spanish
Units*1miles
(MPG US)
miles
(MPG Imperial)
OO—km (L/100 km)
km (km/L)
EV indicator On Off
—O—
switch settingsDrive
information
1Desired status screen
*2—O—
Drive information screen displayed on
the first screen of
(Drive information 1)
Current fuel consump- tion
*3—O—Average
fuel
economy
(after reset)
Drive information screen displayed on
the second screen of
(Drive information 2)
Distance
(range)
*3—O—Average speed
(after reset)
Drive information screen displayed on
the third screen of
(Drive information 3)
Average
fuel
economy (after
refuel)
*3—O—
Elapsed time
(after start)
Pop-up displayOnOff—O—
Accent color*4Color 1Color 2OO—
123
Page 496 of 548
496
GS450h_OM_OM30G62U_(U)
8-2. Customization
*1: The default setting varies according to countries.
*2: Some status screens cannot be registered (indicated on the multi-information display)
*3: 2 of the following items: current fuel consumption, average fuel economy (after reset),
average fuel economy (after refuel), average fuel economy (after start), average vehi-
cle speed (after reset), average vehicle spee d (after start), distance (driving range),
distance (after start), elapsed time (after reset), elapsed time (after start), blank
*4:Except F SPORT models
*5:F SPORT models
Changeover to tachometer
when sport mode is selected
AutoHybrid system
indicator (always) —O—
Tachometer (always)
Clock 12-hour
display 24-hour display
—O—
Needle
*5Blue Red—O—
White
Rev indicator
*54000 rpm 2000 to
6000 rpm—O—
Off
Rev peak
*5On Off—O—
FunctionDefault settingCustomized setting123
Page 502 of 548
502
GS450h_OM_OM30G62U_(U)
8-2. Customization
■Intuitive parking assist*1, 2
*1: If equipped
*2: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.
■Driving mode select switch (→P. 258)
FunctionDefault
settingCustomized setting
Detection distance of the front center
sensorFarNearO—O
Detection distance of the rear center
sensorFarNearO—O
Buzzer volume31 to 5O—O
Display setting
(when intuitive parkin g assist is operat-
ing)All sensors displayedDisplay offO—O
123
FunctionDefault
settingCustomized setting
Power train controlNormalPowerO——Eco
Chassis controlNormalSportO——
Air conditioning operationNormalEcoO——
123
Page 526 of 548
526What to do if... (Troubleshooting)
GS450h_OM_OM30G62U_(U)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (→P. 406)
●The parking brake indicator is on
Is the parking brake released? ( →P. 196)
Depending on the situation, other types of warning buzzer may also sound.
(→ P. 404, 410)
●Did anyone inside the vehicle open a door during setting the alarm?
The sensor detects it and the alarm sounds. (→ P. 77)
To stop the alarm, turn the power switch to ON mode or start the hybrid system.
●Is the electronic key left inside the vehicle or the moon roof opened?
Check the message on the multi-information display. (→ P. 410)
●When a warning light turns on or a warning message is displayed, refer to
P. 404, 410.A warning buzzer sounds during driving
An alarm is activated and the horn sounds
A warning buzzer sounds when leaving the vehicle
A warning light turns on or a warning message is displayed