ECO mode Lexus GS450h 2017 Workshop Manual

4006-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30F92E_(EE)
WARNING
The engine compartment contains many mechanisms and fluids that may move suddenly, become hot, or become electrically energize d. To avoid death or serious injury, observe the following precautions.
■When working on the engine compartment
●Make sure that the “POWER ON” on the multi-information display and the “READY” indicator are both off.
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, power co ntrol unit, radiator, exhaust manifold, etc. right after driving as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the enginecompartment.
●Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes are flamma-
ble.
●Take care because brake fluid can harm your hands or eyes and damage painted sur- faces. If fluid gets on your hands or in your eyes, flush the affected area with clean
water immediately. If you still experi ence discomfort, consult a doctor.
■When working near the electric cooling fans or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fans may automatically start to run if the air conditioning is on and/or the coolant temperature is high. ( P. 411)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear due to dirt in the air.
■If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refillin g, it may indicate a serious problem.

413 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30F92E_(EE)
The meanings of each caution symbol on the top of the 12-volt battery are as fol-
lows:
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flammable and explosive. Therefore, observe the following precautions before recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect the
ground cable.
●Make sure the power switch on the charger is off when connecting and disconnecting
the charger cables to the 12-volt battery.
■After recharging/reconnecting the 12-volt battery
●The hybrid system may not start. Follow the procedure below to initialize the system.
Shift the shift lever to P.
Open and close any of the doors.
Restart the hybrid system.
●Unlocking the doors using the smart entry & start system may not be possible immedi- ately after reconnecting the 12-volt battery. If this happens, use the wireless remotecontrol or the mechanical key to lock/unlock the doors.
●Start the hybrid system with the power switch in ACCESSORY mode. The hybrid sys-tem may not start with the power switch turned off. However, the hybrid system willoperate normally from the second attempt.
●The power switch mode is recorded by the vehicle. If the 12-volt battery is reconnected,the vehicle will return the power switch mode to the status it was in before the 12-volt battery was disconnected. Make sure to tu rn off the power switch before disconnect
the 12-volt battery. Take extra care when connecting the 12-volt battery if the power switch mode prior to discharge is unknown.
If the system will not start even after multiple attempts at all methods above, contact any
authorized Lexus retailer or Lexus author ized repairer, or any reliable repairer.
Caution symbols
No smoking, no naked flames, no sparks12-volt battery acid
Shield eyesNote operating instructions
Keep away from childrenExplosive gas
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421 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30F92E_(EE)
■The initialization operation (vehicles with the tire pressure warning system)
●Make sure to carry out initialization after adjusting the tire inflation pressure. Also, make sure the tires are cold before carry ing out initialization or tire inflation pres-
sure adjustment.
●If you have accidentally turned the power switch off during initialization, it is not neces- sary to manually restart the initialization ag ain, as initialization will restart automatically
the next time the power switch is turned to ON mode.
●If you accidentally perform in itialization when initialization is not necessary, adjust the tire inflation pressure to the specified leve l when the tires are cold, and conduct initial-
ization again.
■Warning performance of the tire pressure warning system (if equipped)
The warning of the tire pressure warning syst em will change in accordance with the con-
ditions under which it was initialized. For this reason, the system may give a warning even if the tire pressure does not reach a low enough level, or if the pressure is higher than the pressure that was adjusted to when the system was initialized.
■When initialization of the tire pressure warn ing system has failed (vehicles with the tire pressure warning system)
Initialization can be co mpleted in a few minutes. However, in the following cases, the set-
tings have not been recorded and the syst em will not operate properly. If repeated attempts to record tire inflation pressure settings are unsuccessful, have the vehicleinspected by any authorized Lexus retailer or Lexus authorized repairer, or any reliable
repairer.
●The initialization message is not displayed on the multi-information display when per- forming initialization.
●After carrying out the initializat ion procedure, the tire pressure warning light blinks for 1 minute then stays on after driving for 20 minutes.
■Registering ID codes (vehicles with the tire pressure warning system)
The ID codes of the tire pressure warning valve and transmitters for two sets of wheels can be registered.
It is not necessary to register the ID codes wh en replacing normal tires with snow tires, if the ID codes for the wheels of both normal tires and snow tires are registered before-hand.
For information about changing ID codes, ask any authorized Lexus retailer or Lexus authorized repairer, or any reliable repairer.
■Certification for tire pressure warning system (vehicles with the tire pressure warning
system)

427 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30F92E_(EE)
WARNING
■When inspecting or replacing tires
Observe the following precautions to prevent accidents. Failure to do so may cause damage to parts of the drive train as well as dangerous han-
dling characteristics, which may lead to an acc ident resulting in death or serious injury.
●Do not mix tires of different makes, models or tread patterns. Also, do not mix tires of remarkably different treadwear.
●Do not use tire sizes other than those recommended by Lexus.
●Do not mix differently constructed tires (radial, bias-belted or bias-ply tires).
●Do not mix summer, all season and snow tires.
●Do not use tires that have been used on another vehicle.Do not use tires if you do not know how they were used previously.
●Vehicles with compact spare tire: Do not tow if your vehicle has a compact spare tire
installed.
●Vehicles with emergency tire puncture repair kit: Do not tow anything if a tire that has been repaired using the emergency tire punc ture repair kit is installed. The load on
the tire may cause unexpected damage to the tire.
■When initializing the tire pressure warning system (vehicles with the tire pressure warning system)
Do not initialize tire inflation pressure withou t first adjusting the tire inflation pressure to the specified level. Otherwise, the tire pre ssure warning light may not come on even if the tire inflation pressure is low, or it may come on when the tire inflation pressure is
actually normal.
■Caution regarding interference with electronic devices (vehicles with the tire pres- sure warning system featuring a tire inflation pressure display function)
●Users of any electrical medical device other than implantable cardiac pacemakers,cardiac resynchronization therapy-pacemakers or implantable cardioverter defi-
brillators should consult the manufacturer of the device for information about its operation under the influence of radio waves.Radio waves could have unexpected effects on the operation of such medical
devices.
●People with implantable cardiac pacemakers, cardiac resynchronization therapy-pacemak-
ers or implantable cardioverter defibrillators should not come within 450 mm (17.7 in.) ofthe tire pressure warning system initiators.
The radio waves may affect the operation of such devices.

4907-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
*: For the EV drive mode operating conditions (P. 222).
Warning messageDetails/Actions
Indicates that the EV drive mode is not available*The reason the EV drive mode is not available (the vehicle is idling, battery charge is low, speed is higher
than the EV drive mode operating speed range, accel- erator pedal is depressed too much) may be dis-played.
A buzzer also sounds.  Use the EV drive mode when it becomes available.

4937-2. Steps to take in an emergency
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When trouble arises
GS450h_300h_OM_OM30F92E_(EE)
Interior buzzerExteriorbuzzerWarning messageDetails/Actions
Once
The electronic key is not detectedwhen 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 openedand 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 wasin 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 thevehicle with the electronic key andlock 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)

4957-2. Steps to take in an emergency
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When trouble arises
GS450h_300h_OM_OM30F92E_(EE)
Con-
tinuous
(Vehicles with the entry function)
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 eitherfront door by opening a door and
putting the inside lock button into the lock position, then closing thedoor by pulling on the outside door
handle with the electronic key still inside the vehicle.For some models only: An attempt
was made to lock the doors other than using the smart entry & startsystem while the electronic key was
still inside the vehicle.  Retrieve the electronic key from the vehicle and lock the
doors again.
Once
• When the doors were unlocked with the mechanical key and thenthe power 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 power switch was pressed twoconsecutive times.
 Touch the electronic key to the power switch while depressingthe brake pedal.
Once
An attempt was made to start thehybrid system with the shift lever inan incorrect position.
 Shift the shift lever to P and start the hybrid system.
InteriorbuzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)

4967-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)

Power was turned off due to the automatic power off function.
 Next time when starting the hybrid system, operate thehybrid system for approximately
5 minutes to recharge the 12- volt battery.
OnceThe electronic key has a low battery. Replace the electronic key bat-
tery. ( P. 435)
Once
The driver’s door was opened and
closed with the power switch turned off and then the power switch wasput in ACCESSORY mode twice
without the hybrid system being started. Press the power switch while
depressing the brake pedal.
During an hybrid system starting procedure in the event that the elec-
tronic key was not functioning prop- erly ( P. 528), the power switch was touched with the electronic key.
 Press the power switch within 10 seconds of the buzzer sounding.
Once
The steering lock could not be
released within 3 seconds of the power switch being pressed. Press the power switch while
depressing the brake pedal and moving the steering wheel leftand right.
InteriorbuzzerExteriorbuzzerWarning messageDetails/Actions
(Flashes)

5247-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
When the hybrid system does not start, the following steps can be used as an
interim measure to start the hybrid system if the power switch is functioning nor-
mally.
Do not use this starting procedure except in cases of emergency.
Press the parking brake switch to ch eck that the parking brake is set.
( P. 232)
Parking brake indicator will come on.
Shift the shift lever to P.
Turn the power switch to ACCESSORY mode.
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 system may
be malfunctioning. Have the vehicle inspected by any authorized Lexus retailer
or Lexus authorized repairer, or any reliable repairer.
Emergency start function
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5287-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
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 willturn to ON mode.
When the smart entry & start system is deactivated in customization setting, thepower switch will turn to ACCESSORY
mode.
Firmly depress the brake pedal and ch eck that is shown on the multi-
information display.
Press the power switch.
In the event that the hybrid system still cannot be started, contact any authorized
Lexus retailer or Lexus authorized repairer, or any reliable repairer.
■Stopping the hybrid system
Shift the shift lever to P and press the power switch 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. 435)
■Alarm (if equipped)
Using the mechanical key to lock the doors or trunk will not set the alarm system. If a door or trunk are unlocked using the me chanical key when the alarm system is set,
the alarm may be triggered. ( P. 91)
■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. 218)
■When the electronic key does not work properly
●Make sure that the smart entry & start system has not been deactivated in the customi- zation setting. If it is off, turn the function on. (Customizable features: P. 561)
●Check if battery-saving mode is set. If it is set, cancel the function. (P. 154)
Starting the hybrid system
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