warning Lexus HS250h 2011 Do-it-yourself maintenance / LEXUS 2011 HS250H (OM75037U) Manual Online

5
When trouble arises
535
5-2. Steps to take in an emergency
CAUTION
●Have the wheel nuts tightened with a torque wrench to 76 ft•lbf (103 N•m, 10.5
kgf•m) as soon as possible after changing wheels.
Failure to follow these precautions could cause the wheel nuts to loosen and the
tire to fall off, resulting in death or serious injury.
●When installing a tire, only use wheel nuts that have been specifically designed
for that wheel.
●If there are any cracks or deformations in the bolt screws, nut threads or bolt
holes of the wheel, have the vehicle inspected by your Lexus dealer.
Failure to follow these precautions could cause the wheel nuts to loosen and the tire
to fall off, resulting in death or serious injury.
NOTICE
■Do not drive the vehicle with a flat tire
Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and the wheel
beyond repair.
■Be careful when driving over bumps with the compact spare tire installed on the
vehicle.
The vehicle becomes lower when driving with the compact spare tire compared to
when driving with standard tires. Be careful when driving over uneven road sur-
faces.
■Driving with tire chains and the compact spare tire
Do not fit tire chains to the compact spare tire.
Tire chains may damage the vehicle body and adversely affect driving performance.
■When replacing the tires
When removing or fitting the wheels, tire s or the tire pressure warning valve and
transmitter, contact your Lexus dealer as the tire pressure warning valve and trans-
mitter may be damaged if not handled correctly.

536
5-2. Steps to take in an emergency
NOTICE
■To avoid damage to the tire pressure warning valves and transmitters
When a tire is repaired with liquid sealants, the tire pressure warning valve and
transmitter may not operate properly. If a liquid sealant is used, contact your Lexus
dealer or other qualified service shop as so on as possible. Make sure to replace the
tire pressure warning valve and transmitter when replacing the tire. ( P. 444)

548
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 and turn off the air conditioning
system.
Check to see if steam is coming out from the engine area.
If you see steam:
Stop the hybrid system. Carefully lift 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.
Check to see if the cooling fans are operating.
If the fans are operating:
Wait until the high engine coolant temperature warning light goes
off 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 SYSTEM OVERHEAT” is sh own on the multi-information
display:
The power control unit may be overheating.
Follow the correction procedure as described below.

573
6-1. Specifications
6
Vehicle specifications
■Treadwear
The treadwear grade is a comparative rating based on the wear rate of
the tire when tested under controll ed conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one and a half (1 - 1 /2) times as
well on the government course as a tire graded 100.
The relative performance of tires de pends upon the actual conditions of
their use. Performance may differ significantly from the norm due to varia-
tions in driving habits, service practices and differences in road characteris-
tics and climate.
■ Traction AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and C, and
they represent the tire’s ability to stop on wet pavement as measured
under controlled condit ions on specified government test surfaces of
asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turning) trac-
tion.
■ Temperature A, B, C
The temperature grades are A (the hi ghest), B, and C, representing
the tire’s resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail-
ure.
Grade C corresponds to a level of performance which all passenger car
tires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum required by law.

574
6-1. Specifications
Warning: The temperature grades of a tire assume that it is properly inflated
and not overloaded.
Excessive speed, underinflation, or excess ive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of transmission, power
steering, power brakes, power windows, power seats,
radio and heater, to the extent that these items are
available as factory-installed equipment (whether
installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil and
coolant, and if so equipp ed, air conditioning and
additional weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the number of occupants speci-
fied in the second column of Table 1
* that follows

583
6-2. Customization
6
Vehicle specifications
Door lock
(
P. 5 8 ,
540)
Opening driver’s
door unlocks all
doors
OffOnO—OO
Smart
access sys-
tem with
push-button
start and
wireless
remote con-
trol
(
P. 4 5 ,
55)
Operation signal
(Emergency
flashers)
OnOffO—OO
Open door
warning buzzerOnOff———O
Operation signal
(buzzer volume)Level 7OFF to level 6O—OO
Ti m e e l a p s e d
before the auto-
matic door lock
function is acti-
vated if a door is
not opened after
being unlocked
60 sec-
onds
Off
O—OO
30 sec- onds
120 sec- onds
Smart
access sys-
tem with
push-button
start
(
P. 4 5 )
Smart door
unlockingDriver’s doorAll the doorsO—OO
Smart access
system with
push-button
start
OnOffO—OO
Number of con-
secutive door
lock operations
2 timesAs many as
desired———O
ItemFunctionDefault settingCustom- ized
setting

590
6-2. Customization
Multi-information display (P. 1 7 2 )
Settings that can be changed using the multi-information switches
Available unitsmiles (MPG), km (km/l), km (l/100 km)
Available languagesEnglish, French and Spanish
■Vehicle customization
●When the “Speed-detecting automatic door lock function” and “Selecting other
than P position locks all d oors” are both on, the door lock operates as follows.
• When any one of the shift position indicato rs other than P is illuminated, all the
doors will be locked.
• If the vehicle is started with all the doors locked, the “Speed-detecting auto- matic door lock function” would not operate.
• If the vehicle is started with any door unlocked, the “Speed-detecting auto-
matic door lock function” will operate.
●When the smart access syst em with push-button start is off, the “Smart door
unlocking function” cannot be customized.
●When the doors remain closed after unlocking the doors and the “Automatic
door lock function” activates, the signals will be generated in accordance with
the “Operation signal (emergency flashers)” and the “Operation signal (buzzer
volume)” settings.
■In the following situations, customize mode in which the settings can be changed
through the multi-information switches will automatically be turned off.
●A warning message appears after the customize mode screen is displayed.
●The “POWER” switch is turned off.
●The vehicle begins to move while the customize mode screen is displayed.

592
6-3. Initialization
Items to initialize
ItemWhen to initializeReference
Engine oil maintenance
dataAfter changing engine oilP. 4 3 2
Tire pressure warning
system
• When rotating the tires on vehicles with differing front and rear tire infla-
tion pressures
• When changing the tire size
P. 443
The following items must be initialize d for normal system operation after
such cases as the 12-volt battery being reconnected, or maintenance
being performed on the vehicle.

609
Abbreviation list
TINTire Identification Number
TPMSTire Pressure Warning System
TRACTraction Control
VINVehicle Identification Number
VSCVehicle Stability Control
ABBREVIATIONSMEANING

610
Alphabetical index
Alphabetical index
A/C (vehicles without navigation system)Air conditioning filter .......................456
Automatic air conditioning system .................................................. 256
A/C (vehicles with navigation system)*
ABS............................................................. 229
AFS ..............................................................188
Adaptive front lighting system .........188
Air conditioning filter ..........................456
Air conditioning system (vehicles without navigation system)Air conditioning filter .......................456
Automatic air conditioning
system .................................................. 256
Air conditioning system (vehicles with navigation
system)*
Airbags Airbag operating conditions............................................ 109
Airbag precautions for your child...........................................................113
Airbag warning light ........................ 499
Curtain shield airbag operating conditions.............................................. 110
Curtain shield airbag precautions ...........................................113
Front passenger occupant classification system......................... 118
General airbag precautions ............113
Locations of airbags.......................... 106 Modification and disposal of
airbags..................................................... 117
Proper driving post ure ............ 104, 113
Side airbag operating conditions ..............................................110
Side airbag precautions..................... 113
Side and curtain shield airbags operating conditions ........................110
Side and curtain shield airbags precautions ........................................... 113
SRS airbags ............................................106
Alarm .......................................................... 100
Antenna .....................................................274
Anti-lock brake system ...................... 229
Armrest ..................................................... 381
Audio input (vehicles without navigation system) ............................... 311
Audio input (vehicles with navigation system)*
Audio remote control switches*
Audio system (vehicles without navigation system)Antenna................................................... 274
Audio input ............................................... 311
Audio visual input.................................. 311
AUX port .................................................. 311
CD player .............................................. 277
CD player/changer .......................... 277
MP3/WMA disc............................... 285
Optimal use .........................................308
Portable music player ......................... 311
Radio ....................................................... 269
Steering wheel audio switch.......... 312A