Page 817 of 908
8177-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” line on the reservoir.Reservoir cap
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fan operates and to check for coolant
leaks from the radiator or hoses.
The fan operates when the air conditioning system is turned on immediately
after a cold start. Confirm that the fan is operating by checking the fan sound
and air flow. If it is difficult to check these, turn the air conditioning system on
and off repeatedly.
(The fan may not operate in freezing temperatures.)
If the fan is not operating:
Stop the hybrid system immediately and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the nearest Lexus dealer.
4
1
2
3
5
6
7
Page 818 of 908
8187-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
■If “Hybrid System Overheat” is shown on the multi-information dis-
play
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has
cooled down, inspect the
hoses and radiator core (radia-
tor) for any leaks.
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” line on the reservoir.Reservoir cap
“FULL”
“LOW”
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and check fo r 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.
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Page 819 of 908

8197-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
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.
●Check that the indicator on the “POWER ” switch and the “READY” indicator are
off.
●On hybrid vehicles, the gasoline engine may automatically start, or the cooling
fan may suddenly operate even if the gasoline engine stops. Do not touch or
approach rotating parts such as the fan, which may lead to fingers or clothing
(especially a tie, a scarf or a muffler) getting caught, resulting in serious injury.
●Do not loosen the radiator cap while th e hybrid system and radiator are hot.
High temperature steam or coolant could spray out.
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 commercially available coolant additives.
Page 820 of 908
820
ES350 300h_OM_OM33A01U_(U)
7-2. Steps to take in an emergency
If the vehicle becomes stuck
Stop the engine . Set the parking brake and shift the
shift lever to P.
Remove the mud, snow or sand from around the front wheels.
Place wood, stones or some other material under the front wheels to
help provide traction.
Restart the engine .
Shift the shift lever to D or R and release the parking brake. Then, while
exercising caution, depress the accelerator pedal.
■When it is difficult to free the vehicle
Carry out the following procedures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Press to turn off TRAC.
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Page 862 of 908

862
ES350 300h_OM_OM33A01U_(U)
8-2. Customization
■Illumination (P. 603)
FunctionDefault
settingCustom-
ized setting
Interior lights illumination
controlOnOff—————O
“Interior Lights Off Timer”
(Time elapsed before the
interior lights turn off)
15 seconds
Off
O—O—OO7. 5 s e c o n d s
30 seconds
Operation after the
“START STOP ENGINE”
<“POWER”> switch is
turned off
OnOff—————O
Operation when the doors
are unlockedOnOff—————O
Operation when you
approach the vehicle with
the electronic key on your
person
OnOff—————O
Footwell lightingOnOff—————O
Outer foot lightsOnOff—————O
“Exterior Lights Off Timer”
(Time elapsed before the
outer foot lights turn off)
15 seconds
Off
O—O—OO7. 5 s e c o n d s
30 seconds
“Ambient illumin. (instru-
ment panel)”
(Enable/disable operation
of the ornament lights on
the instrument panel)*
OnOff—O—OOO
Sensitivity of the ambient
light sensor used for dim-
ming the meter lights etc.
Standard-2 to +2——O——O
Sensitivity of the ambient
light sensor used for
brightening the meter
lights etc.
Standard-2 to +2——O——O
123456
Page 864 of 908

864
ES350 300h_OM_OM33A01U_(U)
8-2. Customization
■Vehicle customization
●When the “Auto Lock by Speed” and “Auto Lock by Shift from P” are both on, the
door lock operates as follows.
• When shifting the shift lever to any position other than P, all the doors will be
locked.
• If the vehicle is started with all the door s locked, the “Auto Lock by Speed” would
not operate.
• If the vehicle is started with any door unlocked, the “Auto Lock by Speed” will operate.
●When the smart access system with push-b utton start is off, the “Select Doors to
Unlock” cannot be customized.
●When the doors remain closed after un locking the doors and the “Auto Relock
Timer” activates, the signals will be generated in accordance with the “Lock/
Unlock Feedback-Tone” and the “Lock/Unlock Feedback-Lights” settings.
■When customizing using the Remote Touch
Stop the vehicle in a safe place, apply the parking brake, and shift the shift lever to P.
Also, to prevent 12-volt battery discharge, leave the engine running
while customizing the features.
CAUTION
■During customization
As the engine needs to be running during customiza-
tion, ensure that the vehicle is parked in a place with adequate ventilation. In a
closed area such as a garage, exhaust gases including harmful carbon monoxide
(CO) may collect and enter the vehicle. This may lead to death or a serious health
hazard.
NOTICE
■During customization
To prevent 12-volt battery discharge, ensure that the engine is run-
ning while customizing features.
Page 882 of 908

882What to do if... (Troubleshooting)
ES350 300h_OM_OM33A01U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys
can be made by your Lexus dealer. ( P. 121)
●If you lose your electronic ke ys, the risk of vehicle theft
increases significantly. Contact your Lexus dealer immediately.
( P. 122)
●Is the electronic key battery weak or depleted? ( P. 710)
●Is the “START STOP ENGINE” <“POWER”> switch in IGNI-
TION ON mode?
When locking the doors, turn the “START STOP ENGINE”
<“POWER”> switch off. ( P. 1 9 8 , 2 0 5 )
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the elec-
tronic key on your person.
●The function may not operate pr operly due to the condition of
the radio wave. ( P. 130)
If you have a problem, check the following before contacting your
Lexus dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
Page 884 of 908
884What to do if... (Troubleshooting)
ES350 300h_OM_OM33A01U_(U)●
Did you press the “START STOP ENGINE” <“POWER”>
switch while firmly depressing the brake pedal? (
P. 1 9 7 , 2 0 4 )
●Is the shift lever in P? ( P. 200, 207)
●Is the electronic key anywhere detectable inside the vehicle?
( P. 1 2 6 )
●Is the steering wheel unlocked? ( P. 201, 208)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a tem-
porary way. ( P. 803)
●Is the 12-volt battery discharged? ( P. 805, 809)
●Is the “START STOP ENGINE” <“POWER”> switch in IGNI-
TION ON mode?
If you cannot release the shift lever by depressing the brake
pedal with the “START STOP ENGINE” <“POWER”> switch in
IGNITION ON mode ( P. 8 0 1 )
If you think something is wrong
The engine does not start
The shift lever cannot be shifted from P even if you depress the
brake pedal