warning light Lexus HS250h 2010 Service Manual

504
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)
Have the vehicle inspected by your Lexus dealer immediately.Failure to investigate the cause of the following warning may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Wa r n i n g m e s s a g eDetails
(Flashes and
then remains
on)
Indicates a malfunction in the tire pressure warning
system The tire pressure warning light comes on after flash-
ing for 1 minute.

5
When trouble arises
513
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)
Have the malfunction repaired immediatelyAfter taking the specified steps to co rrect the suspected problem, check
that the warning message and light go off.
Interior
buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure
Once
(Flashes)
The electronic key
is not detected
when an attempt
is made to start
the hybrid system.Start the hybrid
system with the
electronic key
present.
Once3 times
(Flashes)
The electronic key
was carried out-
side the vehicle
and a door other
than the driver's
door was opened
and closed while
the “POWER”
switch was in a
mode other than
off.
Bring the elec-
tronic key back
into the vehicle.
The electronic key
was carried out-
side the vehicle
and the driver’s
door was opened
and closed while
the shift position P
was selected with-
out turning off the
“POWER” switch.
Tu r n t h e
“POWER” switch
off or bring the
electronic key
back into the vehi-
cle.

518
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)

Power was turned
off due to the
automatic power
off function.
Next time when
starting the hybrid
system, increase
the engine speed
slightly and main-
tain that level for
approximately 5
minutes to
recharge the 12-
volt battery.
OnceThe electronic key
has a low battery.Replace the elec-
tronic key battery.
(→ P. 4 5 3 )
Interior
buzzerExterior buzzerWarning messageDetailsCorrection
procedure

520
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)
■Warning light display in radar cruise mode
In the following cases, the warning light may not be displayed even if vehicle-to-
vehicle distance decreases:
●When your vehicle and the vehicle ahead are traveling at the same speed or the
vehicle ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
■After changing the engine oil (U.S.A. only)
Make sure to reset the oil maintenance data. (→P. 4 2 6 )

526
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)Firmly tighten each wheel nut two
or three times in the order shown
in the illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
■The compact spare tire
●The compact spare tire is identified by the label “TEMPORARY USE ONLY”
on the tire sidewall.
Use the compact spare tire temporarily, and only in an emergency.
●Make sure to check the tire inflation pressure of the compact spare tire.
(
→ P. 5 5 7 )
■After completing the tire change
The tire pressure warning system must be reset. ( →P. 4 3 9 )
■When using the compact spare tire
As the compact spare tire is not equipped with a tire pressure warning valve and
transmitter, low inflation pressure of the spare tire will not be indicated by the tire
pressure warning system. Also, if you replace the compact spare tire after the tire
pressure warning light comes on, the light remains on.
■If you have a flat front tire on a road covered with snow or ice
Install the compact spare tire on one of the rear wheels of the vehicle. Perform the
following steps and fit tire chains to the front tires:
Replace a rear tire with the compact spare tire.
Replace the flat front tire with the tire removed from the rear of the vehi-
cle.
Fit tire chains to the front tires.

5
When trouble arises
541
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)
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.
Remove the engine compartment cover. ( →P. 423)
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 shown on the multi-information
display:
The power control unit may be overheating.
Follow the correction procedure as described below.

5
When trouble arises
543
5-2. Steps to take in an emergency
HS250h_U_75033U(Canada)After the hybrid system has cooled
down, check the power control
unit coolant level and inspect the
cooling system for leaks.
Add power control unit coolant if
necessary.
Water can be used in an emer-
gency if power control unit coolant
is unavailable. (
→P. 5 5 4 )
Have the vehicle inspected at the nearest Lexus dealer as soon as possi-
ble.
■Overheating
The following symptoms may occur when your vehicle is overheating:
●The high engine coolant temperature warning light comes on or flashes, or the
hybrid system output decreases.
●Steam comes out from the engine area.
●“HYBRID SYSTEM OVERHEAT” is displayed on the multi-information display.

594
HS250h_U_75033U(Canada)
Alphabetical index
Alphabetical index
A/CAir conditioning filter .......................450
Automatic air conditioning system (vehicles without
navigation system)......................... 252
Automatic air conditioning
system (vehicles with
navigation system) *
ABS............................................................. 225
AFS .............................................................. 185
Adaptive front lighting system ......... 185
Air conditioning filter ......................... 450
Air conditioning system (vehicles without navigation
system)Air conditioning filter .......................450
Automatic air conditioning system .................................................. 252
Air conditioning system (vehicles with navigation
system)*
Airbags
Airbag operating conditions..................................107, 108
Airbag precautions for your child............................................................ 111
Airbag warning light ........................ 493
Curtain shield airbag operating conditions............................................ 108
Curtain shield airbag
precautions ............................................ 111
Front passenger occupant
classification system......................... 116
General airbag precautions ............. 111
Locations of airbags.......................... 104
Modification and disposal of
airbags .................................................... 115 Proper driving posture.............. 102, 111
Side airbag operating
conditions ............................................108
Side airbag precautions.......................111
Side and curtain shield airbags operating conditions ......................108
Side and curtain shield airbags precautions .............................................111
SRS airbags............................................ 104
Alarm............................................................ 98
Antenna .................................................... 270
Anti-lock brake system ...................... 225
Armrest .....................................................377
Audio input.............................................. 307
Audio remote control switches*
Audio system Antenna...................................................270
Audio input........................................... 307
Audio visual input.............................. 307
AUX adapter ...................................... 307
CD player .............................................. 273
CD player/changer .......................... 273
MP3/WMA disc................................. 281
Optimal use ......................................... 304
Portable music player ..................... 307
Radio ....................................................... 265
Steering wheel audio switch........308
Audio/video system*
Audio visual input ................................. 307
Automatic air conditioning system Air conditioning filter ....................... 450
Air conditioning system ..................252
Automatic air conditioning
system...................................................252
Automatic headlight leveling
system ......................................................187A

596
Alphabetical index
HS250h_U_75033U(Canada)
Clock (vehicles withoutnavigation system) ............................ 373
Clock (vehicles with navigation system)*
Coin holder .............................................366
Compass ................................................... 391
Condenser ..............................................430
Console box ...........................................365
Cooling system Engine overheating ............................541
Cruise control Cruise control .......................................201
Dynamic radar cruise control .....205
Cup holders ............................................ 367
Curtain shield airbags.......................... 104
Customizable features ....................... 574
Daytime running light system ........... 186
Defogger Rear window........................................260
Side mirrors ..........................................260
Dimensions............................................. 550
Dinghy towing ........................................248
Display
Dynamic radar cruise control..................................................205
Multi-information display.................169
Trip information .................................... 172
Warning message.............................. 501
Do-it-yourself maintenance .............. 416
Door courtesy lights Door courtesy lights.........................360
Wattage................................................. 558
Doors
Door glasses ........................................... 86
Door lock.................................44, 54, 57 Rear door child protector................ 58
Side doors................................................. 57
Side mirrors............................................. 83
Driver’s seat belt reminder light ..... 495
Driver’s seat position memory ........... 68
Driving
Break-in tips........................................... 137
Correct posture................................... 102
Procedures............................................. 136
Winter driving tips .............................244
Driving position memory...................... 68
Electric power steering...................... 225
Electronic key If 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
D
E

602
Alphabetical index
HS250h_U_75033U(Canada)
Steering wheel position memory.................................................. 68
Stop light Replacing light bulbs........................ 479
Wattage................................................. 558
Storage feature......................................363
Stuck If the vehicle becomes stuck........545
Sun visors .................................................. 371
Sunshade Rear .......................................................... 378
Roof ............................................................. 89
Switch Audio remote control switch *
Driving mode selector switch .................................................... 155
Engine switch.........................................145
Fog light switch.....................................194
Ignition switch........................................145
Light switches ....................................... 183
Mode select switch............................ 155
OPEN CLOSE switch *
Power door lock switch .................... 57
Power switch .........................................145
Power window switch ........................ 86
Talk switch (vehicles without navigation system)............. 314, 333
Talk switch (vehicles with
navigation system) *
Telephone switch (vehicles
without navigation system) ....... 333
Telephone switch (vehicles
with navigation system)*
TILT switch*
Tire pressure warning reset switch ................................................... 439
Window lock switch ........................... 86 Wiper and washer switch............... 195
Tail lights Replacing light bulbs ........................479
Switch ........................................................ 183
Wattage .................................................558
Talk switch (vehicles without navigation system) .................. 314, 333
Talk switch (vehicles with navigation system)*
Telephone switch (vehicles without navigation system)............ 333
Telephone switch (vehicles with navigation system)*
Theft deterrent system Alarm.......................................................... 98
Immobilizer system ..............................96
Theft prevention labels.......................... 101
TILT switch*
Tire inflation pressure ......................... 445
Tire information Glossary ................................................568
Size ........................................................... 565
Tire identification number ............. 564
Uniform Tire Quality Grading ... 566
Tires
Chains..................................................... 245
Checking................................................437
Compact spare tire............................ 521
If you have a flat tire ........................... 521
Inflation pressure ............................... 445
Inflation pressure sensor ............... 438
Information ........................................... 562
Replacing ................................................ 521
Rotating tires.........................................437
Size ........................................................... 557
T