ECU Lexus GS300h 2015 Owner's Guide

811-2. Hybrid system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
■If a warning light comes on, a warning message is displayed, or the 12-volt battery is dis-
connected
The hybrid system may not start. In this case, try to start the system again. If the “READY”
indicator does not come on, contact any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional.
■Running out of fuel
When the vehicle has run out of fuel and the hybrid system cannot be started, refuel the
vehicle with at least enough gasoline to make the low fuel level warning light (→P. 4 7 8 )
go off. If there is only a small amount of fu el, the hybrid system may not be able to start.
(The standard amount of fuel is about 9.9 L [2.6 gal., 2.2 Imp.gal.], when the vehicle is on
a level surface. This value may vary when the vehicle is on a slope. Add extra fuel when
the vehicle is inclined.)
■Electromagnetic waves
●High voltage parts and cables on hybrid vehicles incorporate electromagnetic shield-
ing, and therefore emit approximately the same amount of electromagnetic waves as
conventional gasoline powered vehicles or home electronic appliances.
●Your vehicle may cause sound interference in some third party-produced radio parts.
■Hybrid battery (traction battery)
The hybrid battery (traction battery) has a lim ited service life. The lifespan of the hybrid
battery (traction battery) can change in accordance with driving style and driving condi-
tions.
■Declaration of conformity
This model conforms to hydrogen emissions according to regulation ECE100 (Battery
electric vehicle safety).
WA R N I N G
■High voltage precautions
This vehicle has high voltage DC and AC systems as well as a 12-volt system. DC and
AC high voltage is very dangerous and can cause severe burns and electric shock that
may result in death or serious injury.
●Never touch, disassemble, remove or replace the high voltage parts, cables or their
connectors.
●The hybrid system will become hot after starting as the system uses high voltage. Be
careful of both the high voltage and the high temperature, and always obey the warn-
ing labels attached to the vehicle.
●Never try to open the service plug access
hole located behind the rear seats. The ser-
vice plug is used only when the vehicle is ser-
viced and is subject to high voltage.

831-2. Hybrid system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
WA R N I N G
■Hybrid battery (traction battery)
●Never resell, hand over or modify the hybrid battery. To prevent accidents, hybrid
batteries that have been removed from a disposed vehicle are collected through any
authorized Lexus dealer or repairer, or another duly qualified and equipped profes-
sional. Do not dispose of the battery yourself.
Unless the battery is properly collected, th e following may occur, resulting in death
or serious injury:
• The hybrid battery may be illegally dispos ed of or dumped, and it is hazardous to
the environment or someone may touch a high voltage part, resulting in an electric
shock.
• The hybrid battery is intended to be used exclusively with your hybrid vehicle. If the hybrid battery is used outside of your vehicle or modified in any way, accidents
such as electric shock, heat generation, smoke generation, an explosion and elec-
trolyte leakage may occur.
When reselling or handing over your vehi cle, the possibility of an accident is
extremely high because the person receiving the vehicle may not be aware of these
dangers.
●If your vehicle is disposed of without the hybrid battery having been removed, there is
a danger of serious electric shock if high voltage parts, cables and their connectors
are touched. In the event that your vehicle must be disposed of, the hybrid battery
must be disposed of by any authorized Lexus dealer or repairer, or another duly qual-
ified and equipped professional. If the hybrid battery is not disposed of properly, it
may cause electric shock that can re sult in death or serious injury.
NOTICE
■Hybrid battery (traction battery) air intake vents
●Do not place objects that will block the air intake vents. The hybrid battery (traction
battery) may overheat and be damaged.
●Clean the air intake vents regularly to prevent the hybrid battery (traction battery)
from overheating.
●Do not get water or foreign materials in the air intake vents as this may cause a short
circuit and damage the hybrid battery (traction battery).
●Do not carry large amounts of water such as water cooler bottles in the vehicle. If
water spills onto the hybrid battery (tract ion battery), the battery may be damaged.
Have the vehicle inspected by any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional.

841-3. Theft deterrent system
GS450h_300h_OM_OM30F00E_(EE)
Immobilizer system
The indicator light flashes after the
power switch has been turned off to
indicate that the system is operating.
The indicator light stops flashing after
the power switch has been turned to
ACCESSORY or ON mode to indi-
cate that the system has been canceled.
■System maintenance
The vehicle has a maintenance-free type immobilizer system.
■Conditions that may cause the system to malfunction
●If the grip portion of the key is in contact with a metallic object
●If the key is in close proximity to or touching a key to the security system (key with a
built-in transponder chip) of another vehicle
The vehicle’s keys have built-in transp onder chips that prevent the hybrid sys-
tem from starting if a key has not been previously registered in the vehicle’s
on-board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
This system is designed to help prev ent vehicle theft but does not guarantee
absolute security against all vehicle thefts.

851-3. Theft deterrent system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
■Certifications for the immobilizer system

871-3. Theft deterrent system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security

89
1
1-3. Theft deterrent system
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
Double locking system
Vehicles employing this system have
labels on the window glass of both front
doors.
Turn the power switch off, have all the passengers exit the vehicle and ensure that
all the doors are closed.
Using the entry function:
Touch the sensor area on the outside door handle twice within 5 seconds.
Using the wireless remote control:
Press twice within 5 seconds.
Using the entry function: Hold the outside door handle.
Using the wireless remote control: Press .
Unauthorized access to the vehicle is prevented by disabling the door unlock-
ing function from both the interior and exterior of the vehicle.
Setting the double locking system
Canceling the double locking system
WA R N I N G
■Double locking system precaution
Never activate the double locking system when there are people in the vehicle
because all the doors cannot be opened from inside the vehicle.

911-3. Theft deterrent system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
Do one of the following to deactivate or stop the alarm:
●Unlock the doors or open the trunk using the entry function or wireless
remote control.
●Turn the power switch to ACCESSORY or ON mode, or start the hybrid sys-
tem. (The alarm will be deactivated or stopped after a few seconds.)
■System maintenance
The vehicle has a maintenance-free type alarm system.
■Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft, make sure of the follow-
ing:
●Nobody is in the vehicle.
●The windows and moon roof (if equipped) are closed before the alarm is set.
●No valuables or other personal items are left in the vehicle.
Deactivating or st opping the alarm

931-3. Theft deterrent system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
●The intrusion sensor detects intruders or movement in the vehicle.
●The tilt sensor detects changes in vehicle inclination, such as when the vehicle
is towed away.
This system is designed to deter and pr event vehicle theft but does not guarantee
absolute security against all intrusions.
■Setting the intrusion sensor and tilt sensor
The intrusion sensor and tilt sensor will be set automatically when the alarm is
set. ( →P. 9 0 )
■Canceling the intrusion sensor and tilt sensor
If you are leaving pets or other moving things inside the vehicle, make sure to
stop the intrusion sensor and tilt sensor before setting the alarm, as they will
respond to movement inside the vehicle.
Turn the power switch off.
Press the intrusion sensor and tilt
sensor cancel switch.
A message will be shown on the
multi-information display in the
instrument cluster.
Press the switch again to re-enable
the intrusion sensor and tilt sensor.
Intrusion sensor (if equipped) and tilt sensor (if equipped)
1
2

951-3. Theft deterrent system
1
GS450h_300h_OM_OM30F00E_(EE)
For safety and security
■Tilt sensor detection considerations (if equipped)
The sensor may trigger the alarm in the following situations:
●The vehicle is transported by a ferry, trailer, train, etc.
●The vehicle is parked in a parking garage.
●The vehicle is inside a car wash that moves the vehicle.
●Any of the tires loses air pressure.
●The vehicle is jacked up.
●An earthquake occurs or the road caves in.
NOTICE
■To ensure the intrusion sensor function correctly
●Installing accessories other than genuine Lexus parts or leaving objects between the
driver’s seat and front passenger’s seat may reduce the detection performance.
●To ensure that the sensors operate properly,
do not touch or cover them.
●Do not spray air fresheners or other products
directly into the sensor holes.

1012. Instrument cluster
2
Instrument cluster
GS450h_300h_OM_OM30F00E_(EE)
The indicators inform the driver of the operating state of the vehicle’s various sys-
tems.
Indicators
Turn signal indicator
(→ P. 2 3 0 ) Rear fog light indicator
(
→ P. 2 4 9 )
Tail light indicator
( → P. 2 3 6 ) Cruise control indicator
(
→ P. 311, 323, 327)
Headlight high beam
indicator ( →P. 2 3 7 )
(If equipped)
Dynamic radar cruise
control indicator
(→ P. 303, 315)
(If equipped)
Automatic High Beam
indicator ( →P. 2 4 5 ) /
Adaptive High-beam
System indicator
( → P. 2 4 1 ) Cruise control “SET”
indicator
(
→ P. 303, 315, 327)
Front fog light indicator
( → P. 2 4 9 )
(If equipped)
LDA indicator ( →P. 2 9 3 ) /
LKA indicator ( →P. 2 8 5 )
*1
(If equipped)
Lexus parking assist-sensor
indicator*2
Brake hold operated
indicator ( →P. 2 3 4 )
*3
(If equipped)
“AFS OFF” indicator
(→ P. 2 3 8 ) *4Security indicator
(→ P. 8 4 , 9 0 )
*2, 5
Slip indicator ( →P. 3 4 6 )*6Low outside temperature
indicator ( →P. 1 0 4 )
*2VSC OFF indicator
(→ P. 3 4 7 )“READY” indicator
(→ P. 2 1 7 )
*3, 7
(If equipped)
PCS (Pre-Crash Safety
system) warning light
(→ P. 2 7 2 ) EV indicator ( →P. 76 )