headlights Lexus HS250h 2010 Do-it-yourself maintenance / LEXUS 2010 HS250H OWNERS MANUAL (OM75006U)

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4-2. MaintenanceMaintenance 
requirements.............................. 409
General maintenance ................... 411
Emission inspection and 
maintenance (I/M) 
programs ....................................... 415
4-3. Do-it-yourself maintenance Do-it-yourself service 
precautions ................................... 416
Hood................................................... 419
Positioning a floor jack............... 420
Engine compartment.................. 422
12-volt battery................................ 433
Tires ................................................... 437
Tire inflation pressure................. 445
Wheels.............................................. 448
Air conditioning filter................. 450
Electronic key battery ................ 453
Checking and replacing 
fuses ................................................ 455
Headlight aim 
(LED headlights) ....................... 467
Light bulbs ....................................... 469 5-1. Essential information
Emergency flashers .................... 482
If your vehicle needs to be 
towed ............................................ 483
If you think something is 
wrong ............................................ 489
Event data recorder.................... 490
5-2. Steps to take in an emergency If a warning light turns on 
or a warning buzzer 
sounds... ......................................... 492
If a warning message is 
displayed........................................ 501
If you have a flat tire...................... 521
If the hybrid system will not 
start ................................................ 530
If you lose your keys .................... 532
If the electronic key does 
not operate prop erly ............... 533
If the vehicle 12-volt battery 
is discharged ............................... 536
If your vehicle overheats ............ 541
If the vehicle becomes 
stuck................................................ 545
5When trouble arises

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Pictorial indexExterior
Moon roof P. 89
Headlights (low beam) P. 183
Fog lights P. 194
Turn signal lights P. 159
Side marker lights P. 183
Hood P. 419
Parking lights P. 183
Windshield wipers P. 195Outside rear view mirrors
P. 83
Turn signal lights P. 159
Headlights (high beam) P. 183

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1-4. Adjustable components (seats, mirrors, steering wheel)
Before driving
Inside rear view mirror
In automatic mode, sensors are used to detect the headlights of vehicles
behind and the reflected light is automatically reduced.
Type A
Turns automatic mode on/ off
The indicator comes on when
automatic mode is turned on.
The mirror will revert to auto-
matic mode each time the
“P
OWER” switch is turned to
ON mode.
Type B
Turns automatic mode on/off
The indicator comes on when
automatic mode is turned on.
The mirror will revert to auto-
matic mode each time the
“P
OWER” switch is turned to
ON mode.
Indicator
Indicator

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2
When driving
2-3. Operating the lights and windshield wipers
Headlight switch
The headlights can be operated manually or automatically.
U.S.A.
Turning the end of the lever turns on the lights as follows:
Turn off the daytime
running light system
The headlights, park-
ing lights and so on
turn on and of
f auto-
matically (when the
“P

OWER” switch is in
ON mode).
The side marker, park -
ing, tail, license plate
and instrument panel
lights turn on.
The headlights and all
the lights listed above
turn on.

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2-3. Operating the lights and windshield wipers
Canada
Turning the end of the lever turns on the lights as follows:The headlights, park-
ing lights and so on
turn on and of

f auto-
matically (when the
“P
OWER” switch is in
ON mode).
The side marker, park -
ing, tail, license plate
and instrument panel
lights turn on.
The headlights and all
the lights listed above
turn on.

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2-3. Operating the lights and windshield wipers
2
When driving
Turning on the high beam headlights
With the headlights on, push the
lever away from you to turn on
the high beam

s.
When the light switch is in
position, the Automatic High Beam
sy
stem will be activated. ( P. 1 8 8 )
Pull the lever toward you to the
ce
nter position to turn the high
beams off.
Pull the lever toward you and
release it to flash the high beams
once.
You can flash the high beams with
the headlights on or off.
AFS (Adaptive Front-lighting System) (if equipped)
AFS (Adaptive Front-lighting System) secures excellent visibility at inter-
sections and on curves by automatically adjusting the dir
ection of the
light axis of the headlights according to vehicle speed and the degree of
the tire’s angle as controlled by steering input.
AFS operates at speeds of 6 mph (10 km/h) or higher.
■ Deactivating AFS
Press the menu switch.
The multi-information display will
change modes to electronic fea-
ture control mode.
Press the “ENTER” switch
upwards or downwards until
AF

S appears.

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2-3. Operating the lights and windshield wipers
Press the “ENTER” switch to
change to OFF. 
The “AFS OFF” indicator will come
on.
Each pressing of the switch turns
AFS on and off.
Press the menu switch to change to
the norma
l display.
■Daytime running light system (if equipped)
To make your vehicle more visible to othe r dr
ivers, the headlights turn on automati-
cally (at a reduced intensity) whenever the hy
brid system is started and the parking
brake is released. Daytime running ligh ts are not designed for use at night.
For the U.S.A.: Daytime running lights can be turned off by operating the switch.
■Headlight control sensor
■Automatic light off system
●When the headlights come on: The headligh ts and tail lights turn off 30 seconds
after a door is opened and closed if the “POWER” switch is turned to ACCES -
SORY mode or turned off. (The lights turn off immediately if on the key is
pressed after all the doors are locked.)
●When only the tail lights come on: The tail lights turn off automatically if the
“POWER” switch is turned to ACCESSORY mode or turned off and the
driver’s door is opened.
To turn the lights on again, turn the “POWER” s
witch to ON mode, or turn the light
switch off once and then back to or .
The sensor may not function properly if an
object is placed on the sensor, or anything
that blocks the sensor is affixed to the wind-
shield. 
Doing so interferes with the sensor detecting
the level of ambient light and may cause the
automatic headlight system to malfunction.

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2-3. Operating the lights and windshield wipers
2
When driving
■Automatic headlight leveling system (if equipped)
The level of the headlights is automatically adjusted according to the number of
passengers and the loading condition of the vehicle to ensure that the headlights do
not interfere with other road users.
■ If the “AFS OFF” indicator flashes (if equipped)
It may indicate a malfunction in th e system. Contact your Lexus dealer.
■Customization
Settings (e.g. light sensor sensitivity) can be changed. 
(Customizable features  P. 5 7 2 )
NOTICE
■To prevent 12-volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is off.

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2-3. Operating the lights and windshield wipers
Automatic High Beam
: If equipped
The Automatic High Beam uses an in-vehicle camera sensor to assess the
brightness of streetlights, the lights of oncoming and preceding vehicles,
etc., and automatically turns high beam on or off as necessary.
■Activating the Automatic High Beam system
Turn the headlight switch to the position.
Push the lever away from you.
The Automatic High Beam indi -
cator will come on when the
headlights ar
e turned on auto -
matically to indicate that the sys -
tem is active.

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2-3. Operating the lights and windshield wipers
■The Automatic High Beam can be operated when
The “POWER” switch is ON mode.
■Camera sensor detection information
●High beam may not be automatically turned off in the following situations:
• When oncoming vehicles suddenly appear from a curve.
• When the vehicle is cut in front of by another.
●High beam may be turned off if an oncoming vehicle that is using fog lights with-
out using the headlights is detected.
●House lights, street lights, red traffic sign als, and illuminated billboards or signs
may cause the high beam to turn off.
■ High beam automatic turning on or off conditions
When all of the following conditio ns are fulfilled, high beam will be
automatically turned on (after approximately 1 second):
● V
ehicle speed is above approximately 20 mph (32 km/h).
●The ar
ea ahead of the vehicle is dark.
●Ther
e are no oncoming or preced ing vehicles with headlights or
tail lights turned on.
If any of the following conditions ar
e fulfilled, high beam will be auto-
matically turned off:
● V
ehicle speed drops below approximately 20 mph (32 km/h).
●The ar
ea ahead of the vehicle is not dark.
●Oncoming or pr
eceding vehicles have headlights or tail lights
turned on.