2015 Lexus GS450h engine

5287-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
Indicates that the hybrid
system output is limited
because the engine oil is
overheatedDrive the vehicle at a safe
speed until the warning
message disappears.
Indicates that the vehicle
is unable to drive over
65 mph (110 km/h) until
the transmission warms
up
Wait until the transmis-
sion warms up.
Indicates that remaining
fuel is approximately 2.6
gal. (10.0 L, 2.2 Imp.gal.)
or less
Refuel the vehicle.
Indicates that the power
switch is turned off or
turned to ACCESSORY
mode and the driver’s
door is opened while the
lights are turned on
Tu r n t h e l i g h t s o f f .
Indicates that the driver’s
door was opened with the
shift position in any posi-
tion other than P
Shift the shift position to P.
Wa r n i n g m e s s a g eDetailsCorrection procedure
(If equipped)
(Flashes)
(Flashes)

5387-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
InteriorbuzzerExterior
buzzerWa r n i n g m e s s a g eDetailsCorrection procedure

Power was turned
off due to the auto-
matic power off
function.
Next time
when start-
ing the
hybrid sys-
tem,
increase the
engine
speed
slightly and
maintain
that level for
approxi-
mately 5
minutes to
recharge
the 12-volt
battery.
OnceThe electronic key
has a low battery.
Replace the
electronic
key batter y.
(  P. 4 6 0 )

5527-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
CAUTION
■When using the compact spare tire
●Remember that the compact spare tire provided is specifically designed for use
with your vehicle. Do not use your compact spare tire on another vehicle.
●Do not use more than one compact spare tire simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting opera-
tions that cause sudden engine braking.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly:
• ABS & Brake assist
•VSC
•TRAC
•Cruise control
• Dynamic radar cruise control (if equipped)
•PCS (if equipped)
•EPS
•AFS (if equipped) •AVS
• LKA (Lane-Keeping Assist)
(if equipped)
• Lexus parking assist monitor
•Intuitive parking as sist (if equipped)
• Navigation system (if equipped)
• DRS (if equipped)
• VGRS (if equipped)
•LDH (if equipped)

5637-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
Start the engine of the second vehicle. Increase the engine speed
slightly and maintain at that le vel for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Open and close any of th e doors of your vehicle with the power switch
off.
Maintain the engine speed of the se cond vehicle and start the hybrid
system of your vehicle by turning the power switch to ON mode.
Make sure the “READY” indicator co mes on. If the indicator does not
come on, contact your Lexus dealer.
Once the hybrid system has started, remove the jumper cables in the
exact reverse order from wh ich they were connected.
Once the hybrid system starts, have the vehicle inspected at your Lexus
dealer as soon as possible.
■Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.
■To prevent 12-volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
●Turn off any unnecessary electrical compon ents when the vehicle is running at a
low speed for an extended period, such as in heavy traffic.
■Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gradually even when the
vehicle is not in use, due to natural discharge and the draining effects of certain elec-
trical appliances. If the vehicle is left for a long time, the 12-volt battery may dis-
charge, and the hybrid system may be unable to start. (The 12-volt battery recharges
automatically while the hybrid system is operating.)
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566
GS450h_OM_OM30F70U_(U)
7-2. Steps to take in an emergency
If your vehicle overheats
■If the needle of the engine coolant temperature gauge enters the red
zone
Stop the vehicle in a safe place an d turn off the air conditioning sys-
tem, 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.
●The needle of the engine coolant temperature gauge ( P. 91) enters
the red zone or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)
●“Hybrid System Overheat” ( P. 527) is shown on the multi-informa-
tion display.
●Steam comes out from under the hood.
Correction procedures
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5677-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL”
“LOW”
Coolant inlet cap
Add coolant if necessary.
( P. 569)
Water can be used in an emer-
gency if engine coolant is unavail-
able.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fa ns operate and to check for coolant
leaks from the radiator or hoses.
The fans operate when the air conditioning system is turned on immediately
after a cold start. Confirm that the fans are operating by checking the fan
sound and air flow. If it is difficult to check these, turn the air conditioning sys-
tem on and off repeatedly. (The fans may not operate in freezing tempera-
tures.)
If the fans are not operating:
Stop the hybrid system immediately and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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5707-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
CAUTION
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the hood, do not open the hood until the
steam has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the indicator on the
power switch and the “READY” indicator are off.
When the hybrid system is operating, the gasoline engine may automatically
start, or the cooling fan may suddenly oper ate even if the gasoline engine stops.
Do not touch or approach rotating parts such as the fan, which may lead to fin-
gers or clothing (especially a tie, a scarf or a muffler) getting caught, resulting in
serious injury.
NOTICE
■When adding engine/power control unit coolant
Add coolant slowly after the hybrid syst em has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too quickly can cause da mage to the hybrid
system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
●Do not use any coolant additives.
●Do not loosen the cool ant inlet cap or the
coolant reservoir cap while the hybrid sys-
tem and radiator are hot.
High temperature steam or coolant could
spray out.

GS450h_OM_OM30F70U_(U)
5758-1. Specifications
8
Vehicle specifications
■Vehicle identification number
The vehicle identification number (VIN) is the legal identifier for your
vehicle. This is the primary ident ification number for your Lexus. It is
used in registering the ownership of your vehicle.
This number is stamped on the top le ft of the instrument panel and in
the engine compartment.
This number is also on the Certifi-
cation Label.
■Engine number
The engine number is stamped
on the engine block as shown.
Vehicle identification