2010 Lexus HS250h start engine

5
When trouble arises
537
5-2. Steps to take in an emergency
Connect the jumper cables according to the following procedure:
Connect a positive jumper cable clamp to the exclusive jump start-
ing terminal on your vehicle
Connect the clamp on the other end of the positiv
e cable to the pos-
itive (+) battery terminal on the second v
ehicle
Connect a negative cable clamp to the negative (-) battery terminal
on the second vehicle
Connect the clamp at the other end of the negative cable to a solid,
stationary, unpainted metallic point aw
ay from the exclusive jump
starting terminal and any moving part s, as shown in the illustration.
Start the engine of the second v
ehicle. Increase the engine
speed slightly and maintain that le
vel for approximately 5 min-
utes to recharge the 12-volt battery of your vehicle.
Maintain the engine sp eed of the second v
ehicle and start the
hybrid system of your vehicle by turning the “POWER” switch
to ON mode.
Make sure the “READY” indicator comes on. If the indicator
does not come on, contact your Lexus dealer.
Once the hybrid system has star
ted, remove the jumper cables
in the exact reverse order from which they were connected.

5
When trouble arises
541
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures
■If the engine coolant temperature warning light comes on or flashes
Stop the vehicle in a safe place an d turn of
f the air conditioning
system.
Check to see if steam is coming out from the engine area.
If you see steam: 
Stop the hybrid system. Carefu lly lif
t the hood after the steam
subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the hood.
Remove the engine compartment cover. ( P. 4 2 3 )
Check to see if the cooling fans are operating.
If the fans are operating: 
Wait until the high engine coolant temperature warning light goes
of
f and then stop the hybrid system.
If the fans are not operating: 
Stop the hybrid system immediately and call your Lexus dealer.
The following may indicate that your vehicle is overheating:
●The high engine coolant temperature warning light comes on or
flashes: 
The engine may be overheating.
● “HYBRID S
YSTEM OVERHEAT” is sh own on the multi-information
display: 
The power control unit may be overheating.
Follow the correction procedure as described below.

544
5-2. Steps to take in an emergency
CAUTION
■To prevent an accident or injury when inspecting under the hood of your vehicle
●If steam is seen coming from under the hood, do not open the hood until the
steam has subsided. The engine compartm ent may be very hot, causing serious
injuries such as burns.
●Check that the indicator on the “POWER ” switch and the READY indicator are
off.
●For vehicles with a hybrid system, there are times when the gasoline engine auto-
matically starts to run or the cooling fans suddenly start to operate. Do not touch
or approach the rotating parts of the belt or fans. Doing so may lead to fingers,
clothes or tools getting caught, resulting in injury.
●Do not loosen the coolant reservoir cap while the hybrid system and radiator are
hot. 
Serious injuries, such as burns, may resu lt from hot coolant and steam released
under pressure.
NOTICE
■When adding engine/power control unit coolant
Wait until the hybrid system has cooled down before adding engine/power control
unit coolant. 
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid system.

551
6-1. Specifications
6
Vehicle specifications
■Engine oil selection
“Toyota Genuine Motor Oil” is used in y
our Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil” or equivalent to satisfy the follow-
ing grade and viscosity.
Oil grade: ILSAC multigrade engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good
star

ting in cold weather.
If SAE 0W-20 is not available,
S
AE 5W-20 oil may be used.
However, it must be replaced with
SAE 0W-20 at the next oil
change.
The 0W portion of the oil viscosity rating indicates the characteristic of the oil
which allows cold startability. Oils wi th a lower value before the W allow for
easier starting of the engine in cold weather.
The 20 in 0W-20 indicates the oil viscosity when the oil is at its operating
temper
ature. An oil with a higher viscosity may be better suited if the vehicle
is operated at high speeds, or under extreme load conditions.
How to read oil container label:
The ILSAC (International Lubricant St andar
dization and Approval Com-
mittee) Certification Mark is added to some oil containers to help y
ou
select the oil you should use.
Outside temperature

559
6-1. Specifications
6
Vehicle specifications
NOTICE
■Notice on fuel quality
●Do not use improper fuels. If improper fuels are used, the engine will be dam-
aged.
●Do not use leaded gasoline. 
Leaded gasoline can cause damage to your vehicle’s three-way catalytic convert-
ers causing the emission control system to malfunction.
●Do not use gasohol other than the type previously stated. 
Other gasohol may cause fuel system damage or vehicle performance problems.
●Using unleaded gasoline with an octane number or rating lower than the level
previously stated will cause persistent heavy knocking. 
At worst, this will lead to engine damage.
■Fuel-related poor driveability
If poor driveability is encountered after using a different type of fuel (poor hot start-
ing, vaporization, engine knoc king, etc.), discontinue the use of that type of fuel.
■When refueling with gasohol
Take care not to spill gasohol. It can damage your vehicle’s paint.

595
Alphabetical index
Electric power steering ......................225
Electronic keyIf the electronic key does not 
operate properly ............................ 533
Emergency, in case of If the electronic key does not 
operate properly ............................ 533
If the engine will not start ...............530
If the hybrid system will not 
start........................................................530
If the 12-volt battery is 
discharged ........................................ 536
If the warning buzzer sounds...... 492
If the warning light turns on .......... 492
If the warning message is 
displayed ............................................. 501
If you have a flat tire .......................... 521
If you lose your keys ........................ 532
If you think something is 
wrong................................................... 489
If your electronic key does 
not operate properly.................... 533
If your vehicle becomes stuck .... 545
If your vehicle needs to be  towed ................................................... 483
If your vehicle overheats.................. 541
Emergency flasher Switch ...................................................... 482 Engine
Accessory mode................................. 148
Compartment...................................... 422
Engine switch .........................................147
Hood ......................................................... 419
How to start the engine ....................147
How to start the hybrid 
system ....................................................147
Identification number ...................... 548
If the engine will not start............... 530
If the hybrid system will not 
start ....................................................... 530
Ignition switch ........................................147
Overheating .......................................... 541
Power switch..........................................147
Engine compartment cover ............. 423
Engine coolant Capacity .................................................552
Checking ...............................................428
Preparing and checking before winter .................................... 244
Engine/power control unit coolant Capacity .................................................552
Checking ...............................................428
Preparing and checking before winter .................................... 244
Engine immobilizer system.................. 96E

597
Alphabetical index
Hands-free system 
(for cellular phone)........................... 328
Head restraints Adjustment ................................................71
Headlights aim ....................................... 467
Headlights cleaner .............................. 200
Headlights Adaptive front lighting 
system................................................... 185
Discharge headlights 
precautions .......................................480
Replacing light bulbs ....................... 469
Switch ........................................................183
Wattage ................................................. 556
Heaters Seat heaters.......................................... 375
Side mirrors.......................................... 260
Hill-start assist control ....................... 230
Hood ........................................................... 419
Hooks Grocery bag..........................................381
Horn............................................................. 164
Hybrid system Emergency shut off system ............. 28
Energy monitor/ 
consumption ........................................32
Engine switch ........................................ 147
High voltage components ................ 27
Hybrid system indicators.................165
Ignition switch........................................ 147
Power switch ......................................... 147 I/M test....................................................... 415
Identification
Electric motor ..................................... 549
Engine..................................................... 549
Vehicle ................................................... 548
Ignition switch...........................................147
Illuminated entry system ....................360
Immobilizer system ................................. 96
Indicator lights......................................... 165
Initialization Items to initialize ................................ 584
Inside rear view mirror ........................... 81
Instrument panel light control .......... 163
Interior lights Interior lights ........................................ 360
Switch........................................................ 361
Wattage ................................................. 556
Intuitive parking assist*
Jack Positioning the jack ...........................420
Vehicle-equipped jack .................... 521
Jack handle............................................... 521HI
J
*: Refer to “Navigation System Owner’s Manual”.

600
Alphabetical index
Seat beltsAdjusting the seat belt.........................74
Automatic Locking Retractor ........ 75
Child restraint system 
installation ............................................ 124
Cleaning and maintaining 
the seat belt ....................................... 407
Emergency Locking Retractor ..... 75
How to wear your seat belt..............73
How your child should wear 
the seat belt .......................................... 75
Pre-collision seat belts .................... 232
Pregnant women, 
proper seat belt use......................... 75
Reminder light .....................................495
Seat belt extenders .............................. 76
Seat belt pretensioners .......................74
Seat heaters ............................................ 375
Seat position memory ............................68
Seat ventilator ........................................ 375
Seating capacity .................................... 243
Seats Adjustment .................................... 64, 68
Adjustment 
precautions ..................................67, 70
Child seats/child restraint 
system installation ............................ 124
Cleaning.................................................406
Driver’s seat position 
memory.................................................. 68
Head restraint........................................... 71
Properly sitting in the seat ................ 101
Seat heaters .......................................... 375
Seat position memory ........................ 68
Ventilated seats .................................. 375 Service reminder indicators .............165
Shift lever
Transmission.......................................... 155
Side airbags ............................................. 103
Side marker lights Replacing light bulbs ....................... 469
Switch ........................................................ 183
Wattage ................................................. 556
Side mirrors Adjusting and folding ......................... 83
Mirror position memory ................... 68
Side turn signal lights Replacing light bulbs ........................479
Wattage ................................................. 556
Smart access system with 
push-button start Antenna location ...................................46
Entry functions ........................................ 44
Starting the engine.............................. 147
Starting the hybrid system .............. 147
Smart entry & start system Antenna location ...................................46
Entry function .......................................... 44
Starting the engine.............................. 147
SOS button ............................................. 395
Spare tire Inflation pressure ............................... 555
Storage location .................................. 521
Spark plug ............................................... 552
Specifications ......................................... 548
Speedometer ...........................................162