2015 LEXUS LS600H overheating

871-2. Hybrid system
1
For safety and security
LS600hL_U(OM50E41U)
NOTICE
■Hybrid battery air vents
●Do not put foreign objects over the air vents. The hybrid battery (traction battery)
may overheat and be damaged.
●Clean the air vents regularly to prevent the hybrid battery (traction battery) from
overheating.
●Do not wet or allow foreign substances to enter the air vents as this may cause a
short circuit and damage the h ybrid 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 (t raction battery), the battery may be dam-
aged. Have the vehicle inspected by your Lexus dealer.

1042. Instrument cluster
LS600hL_U(OM50E41U)
■Tachometer
Hybrid System Indicator switches to the tachometer when driving mode is in sport
mode.
■Engine speed
On hybrid vehicles, engine speed is precis ely controlled in order to help improve
fuel efficiency and reduce exhaust emissions etc.
There are times when the engine speed that is displayed may differ even when vehi-
cle operation and driving conditions are the same.
■Outside temperature display
In the following situations, the correct outside temperature may not be displayed, or
the display may take longer than normal to change.
●When stopped, or driving at low speeds (less than 12 mph [20 km/h])
●When the outside temperature has changed suddenly (at the entrance/exit of a
garage, tunnel, etc.)
■Customization
Settings (e.g. on/off operatio n of ECO lamp) can be changed.
(Customizable features P. 565)
NOTICE
■To prevent damage to the engine and its components
●Do not let the indicator needle of the tachometer enter the red zone, which indi-
cates the maximum engine speed.
●The engine may be overheating if the engine coolant temperature gauge is in the
red zone (H). In this case, immediately stop the vehicle in a safe place, and check
the engine after it has cooled completely. ( P. 5 3 0 )

2064-1. Before driving
LS600hL_U(OM50E41U)
CAUTION
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When taking a nap in the vehicle
Always turn the hybrid system off. Otherwise, if you accidentally move the shift
lever or depress the accelerator pedal, this could cause an accident or fire due to
hybrid system overheating. Additionally, if the vehicle is parked in a poorly venti-
lated area, exhaust gases may collect and enter the vehicle, leading to death or a
serious health hazard.
■When braking
●When the brakes are wet, drive more cautiously.
Braking distance increases when the brakes are wet, and this may cause one side
of the vehicle to brake differently than the other side. Also, the parking brake may
not securely hold the vehicle.
●If the electronically controlled brake system does not operate, do not follow other
vehicles closely and avoid hills or sharp turns that require braking.
In this case, braking is still possible, but the brake pedal should be depressed
more firmly than usual. Also, the braking distance will increase. Have your brakes
fixed immediately.
●The brake system consists of 2 or more individual hydraulic systems; if one of the
systems fails, the other(s) will still operate. In this case, the brake pedal should be
depressed more firmly than usual and th e braking distance will increase. Have
your brakes fixed immediately.
■If the vehicle becomes stuck
Do not spin the wheels excessively when any of the tires is up in the air, or the vehi-
cle is stuck in sand, mud, etc. This may damage the driveline components or propel
the vehicle forward or backward, causing an accident.

2184-2. Driving procedures
LS600hL_U(OM50E41U)
■Auto power off function
If the vehicle is left in ACCESSORY mode for more than 20 minutes with the shift
lever in P, the power switch will automatically turn off.
■Sounds and vibrations specific to a hybrid vehicle
P. 7 9
■Electronic key battery depletion
P. 1 3 7
■When the ambient temperature is low, such as during winter driving conditions
It may take time until the “READY” indicator comes on.
■Conditions affecting operation
P. 1 3 4
■Notes for the entry function
P. 1 3 5
■If the hybrid system does not start
The immobilizer system may not have been deactivated. ( P. 8 8 )
Contact your Lexus dealer.
■Steering lock
After turning the power switch off and opening and closing the doors, the steering
wheel will be locked due to the steering lock function. Operating the power switch
again automatically cancels the steering lock.
■When the steering lock cannot be released
■Steering lock motor overheating prevention
To prevent the steering lock motor from ov erheating, the motor may be suspended if
the hybrid system is turned on and off repeatedly in a short period of time. In this
case, refrain from operating the hybrid sy stem. After about 10 seconds, the steering
lock motor will resume functioning. The green indicator light on the power switch
will flash and a message will be shown on the
multi-information display. Press the power
switch again while turning the steering wheel
left and right.

3915-6. Other interior features
5
Interior features
LS600hL_U(OM50E41U)
CAUTION
■Burns/excessive cooling
●Use caution when seating the following persons in a seat to avoid the possibility of
burns or excessive cooling:
• Babies, small children, elderly persons, sick persons and persons with a physi-
cal disability
• Persons who have sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs which induce sleep, such as sleeping drugs and cold remedies
●Do not cover the seat with anything when using the climate control seat. Using
the climate control seat with a blanket or cushion may increase or decrease the
temperature of the seat, resulting in overheating or overcooling.
●Do not use the climate control seat more than necessary. Doing so may cool the
occupants excessively or may cause minor burns or overheating.
NOTICE
■To prevent damage to the climate control seat
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects, such as needle s and nails, into the seat.
■To prevent the 12-volt battery from being discharged
Do not leave the system on longer than necessary when the hybrid system is off.

5307-2. Steps to take in an emergency
LS600hL_U(OM50E41U)●
The needle of the engine
coolant temperature gauge ( P. 99) enters
the red zone or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)
●“Hybrid System Overheat” 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
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 radiator
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact your
Lexus dealer.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

601Alphabetical index
LS600hL_U(OM50E41U)
Console box ........................................... 369
Consumption screen ............................. 115
Coolant..................................................... 445Capacity .................................................543
Checking................................................445
Preparing and checking before winter ....................................................325
Cooling system ..................................... 445 Engine overheating.......................... 530
Hybrid system overheating ......... 530
Cruise control Cruise control......................................253
Dynamic radar cruise control with full-speed range .................... 257
Cup holders ............................................ 368
Curtain shield airbags ........................... 43
Customizable features ....................... 564
Daytime running light system .......... 236
Defogger Front windshield .................................. 341
Outside rear view mirrors ............ 358
Rear window ....................................... 358
Differential Front differential ..................................544
Rear differential .................................. 545
Dimensions .............................................538
Dinghy towing..........................................215 Display
Dynamic radar cruise control with full-speed range ................... 257
LKA (Lane-Keeping Assist)..........277
Multi-information display................ 105
Remote Touch screen ....................330
Trip information ................................... 106
Warning message.............................503
Do-it-yourself maintenance............. 433
Door courtesy lights ........................... 360
Door lock Doors.........................................................145
Smart access system with push-button start .............................. 125
Wireless remote control....................141
Door pockets ..........................................367
Doors .......................................................... 145 Automatic door locking and unlocking system .................... 147
Door glasses ......................................... 189
Door lock.................................................145
Open door warning buzzer ......... 130
Open door warning light .............. 496
Outside rear view mirrors ............. 185
Rear door child-protector ..............146
D

603Alphabetical index
LS600hL_U(OM50E41U)
Energy monitor ........................................ 113
EngineACCESSORY mode........................ 217
Compartment......................................439
Engine switch ........................................ 216
Hood ........................................................436
How to start the hy brid system .... 216
Identification number ...................... 539
If the hybrid system will not start......................................... 517
Ignition switch (power switch).................................. 216
Overheating ........................................ 530
Power switch......................................... 216
Engine compartment cover ............. 440
Engine coolant....................................... 445 Capacity .................................................543
Checking................................................445
Preparing and checking before winter ....................................325
Engine coolant temperature gauge ........................................................ 99
Engine oil ................................................. 442 Capacity .................................................. 541
Checking................................................ 442
Preparing and checking before winter ....................................325
Engine switch ...........................................216
EPS (Electric Power Steering) .............. 290 Function ................................................. 290
Warning light .......................................494
EV drive mode......................................... 221
Event data recorder (EDR) .................... 11 First-aid kit storage belt......................375
Flat tire
Vehicles with a spare tire ............. 506
Vehicles with run-flat tires.............. 515
Floor mats....................................................32
Fluid Brake........................................................545
Hybrid transmission ......................... 544
Washer ................................................... 449
Fog lights...................................................243 Replacing light bulbs .........................481
Switch ...................................................... 243
Footwell light .......................................... 360
Front automatic air conditioning system .................................................... 336
Front fog lights........................................243 Replacing light bulbs .........................481
Switch ...................................................... 243
Front passenger occupant classification system ........................... 55
Front seats ................................................. 156 Adjustment..............................................156
Cleaning................................................. 422
Climate control seats ...................... 387
Correct driving posture .................... 34
Driving position memory................. 172
Head restraints ..................................... 179
Power easy access system .............159
Seat position memory ....................... 172
Front side marker lights......................234 Light switch........................................... 234
Replacing light bulbs .........................481
Welcome light illumination control.................................................... 126F