2010 Lexus GS450h battery

152
2-1. Driving procedures
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■If the hybrid system does not start
The immobilizer system may not have been deactivated. (P. 9 9 )
■When the steering lock cannot be released
■When the “POWER” switch indicator flashes in amber
The system may be malfunctioning. Have the vehicle inspected by your Lexus
dealer immediately.
■If the “READY” light does not come on
If the “READY” light does not come on when you press the “POWER” switch with
the shift lever in “P” and the brake pedal pressed, contact your Lexus dealer imme-
diately.
■Auto power OFF function
If the vehicle is left in ACCESSORY or ON mode (the hybrid system is not operat-
ing) for more than an hour with the shift lever in P, the “POWER” switch will auto-
matically turn off. However, this function cannot entirely prevent 12 volt battery
discharge. Do not leave the vehicle with the “POWER” switch in ACCESSORY or
ON mode for long periods of time when the hybrid system is not operating.
■When the ambient temperature is low
Such as during winter driving conditions, it may take time until the “READY” light
comes on.
■Sounds and vibrations specific to a hybrid vehicle
P. 2 7
■When the hybrid system is malfunctioning
P. 5 4 3
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.

153
2-1. Driving procedures
2
When driving
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■Electronic key battery depletion
P. 4 7
■When the electronic key battery is discharged
P. 4 9 4
■Conditions affecting operation
P. 4 5
CAUTION
■When starting the hybrid system
Always start the hybrid system while sitting in the driver’s seat. Do not press the
accelerator pedal while starting the hybrid system under any circumstances.
Doing so may cause an accident resulting in death or serious injury.
■Stopping the hybrid system in an emergency
If you want to stop the hybrid system in an emergency while driving the vehicle,
push and hold the “POWER” switch for more than 3 seconds.
However, do not touch the "POWER" switch while driving except in an emergency.
Turning the hybrid system off while driving will not cause loss of steering or braking
control, but the power assist to these systems will be lost. This will make it more diffi-
cult to steer and brake, so you should pull over and stop the vehicle as soon as it is
safe to do so.
NOTICE
■To prevent 12 volt battery discharge
Do not leave the “POWER” switch in ACCESSORY or ON mode for long periods
without the hybrid system on.
■When starting the hybrid system
●Do not race the hybrid system.
●If the hybrid system becomes difficult to start or stalls frequently, have the hybrid
system checked immediately.

157
2-1. Driving procedures
2
When driving
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■Downshifting restrictions warning buzzer (in the “S” mode)
To help ensure safety and driving performance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever is operated. (The warning buzzer will sound twice.)
■When driving with the cruise control system (or dynamic radar cruise control sys-
tem)
The engine brake will not operate in the “S” mode, even when downshifting to “5” or
“4”. (P. 1 8 1P. 1 8 4 )
■Snow mode automatic deactivation
Snow mode is automatically deactivated if the “POWER” switch is turned to
ACCESSORY or ON mode after driving in snow mode.
■If the shift lever cannot be shifted from “P”
P. 5 7 3
■If the indicator does not come on even after shifting the shift lever to “S”
This may indicate a malfunction in the transmission. Have the vehicle inspected by
your Lexus dealer immediately. 
(In this situation, the vehicle will operate as if the shift lever is in “D”.)
■When in heavy traffic
To avoid running the hybrid battery (traction battery) down, leave the shift lever in
“D” or “S”.

173
2-3. Operating the lights and windshield wipers
2
When driving
GS_HV_U (OM30C81U)
January 28, 2010 10:42 am
■Headlight control sensor
■Automatic light off system
The headlights and tail lights turn off 30 seconds after all doors are closed if the
“POWER” switch has been switched to ACCESSORY mode or turned OFF while
the headlights are turned on. (The lights turn off immediately if the button on the
key is pressed after all doors are locked.)
To turn the lights on again, switch to ON mode, or turn the light switch off once and
then back to the
or position.
■Automatic headlight leveling system
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 indicator flashes...
It may indicate a malfunction in the system. Contact your Lexus dealer.
■Customization that can be configured at Lexus dealer
Settings (e.g. light sensor sensitivity) can be changed. 
(Customizable features P. 6 1 8 )
NOTICE
■To prevent 12 volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is off.
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.

267
3-2. Using the air conditioning system and defogger
3
Interior features
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■Micro dust and pollen filter
●In order to prevent the windows from fogging up when the outside air is cold,
the following may occur.
• Outside air mode does not switch to .
• The air conditioning system operates automatically.
• The operation cancels after 1 minute.
●In rainy weather, the windows may fog up. Press .
■Air conditioning odors
●During use, various odors from inside and outside the vehicle may enter into
and accumulate in the air conditioning system. This may then cause odor to be
emitted from the vents.
●To reduce potential odors from occurring:
• It is recommended that the air conditioning system be set to outside air mode
prior to turning the vehicle off.
• The start timing of the blower may be delayed for a short period of time
immediately after the air conditioning system is started in automatic mode.
CAUTION
■To prevent the windshield from fogging up
Do not use during cool air operation in extremely humid weather. The differ-
ence between the temperature of the outside air and that of the windshield can
cause the outer surface of the windshield to fog up, blocking your vision.
NOTICE
■To prevent 12 volt battery discharge
Do not leave the automatic air conditioning system on longer than necessary when
the hybrid system is off.

268
3-2. Using the air conditioning system and defogger
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
Rear window and outside rear view mirror defoggers
■Operating conditions
The “POWER” switch must be in the ON mode.
CAUTION
■When the outside rear view mirror defoggers are on
Do not touch the rear view mirror surfaces, as they can become very hot and burn
you.
NOTICE
■To prevent 12 volt battery discharge
Turn the defoggers off when the hybrid system is off.
These features are used to defog the rear window, and to remove rain-
drops, dew and frost from the outside rear view mirrors.
On/off
The defoggers will automatically
turn off after 15 to 60 minutes.
The operation time changes
according to the ambient tem-
perature and vehicle speed.

272
3-3. Using the audio system
GS_HV_U (OM30C81U)
January 28, 2010 1:22 pm
■Using cellular phones
Interference may be heard through the audio system’s speakers if a cellular phone is
being used inside or close to the vehicle while the audio system is operating.
CAUTION
■For vehicles sold in the U.S.A. and Canada
●Pa r t 1 5 o f t h e F CC Ru l e s
FCC Warning:
Any unauthorized changes or modifications to this equipment will void the user’s
authority to operate this device.
●Laser products
• Do not take this unit apart or attempt to make any changes yourself. 
This is an intricate unit that uses a laser pickup to retrieve information from the
surface of compact discs. The laser is carefully shielded so that its rays remain
inside the cabinet. Therefore, never try to disassemble the player or alter any
of its parts since you may be exposed to laser rays and dangerous voltages.
• This product utilizes a laser.
Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
NOTICE
■To prevent 12 volt battery discharge
Do not leave the audio system on longer than necessary when the hybrid system is
off.
■To avoid damaging the audio/video system
Take care not to spill drinks or other fluids over the audio system.

279
3-3. Using the audio system
3
Interior features
GS_HV_U (OM30C81U)
January 28, 2010 1:22 pm
■When the 12 volt battery is disconnected
All preset stations are erased.
■Reception sensitivity
●Maintaining perfect radio reception at all times is difficult due to the continually
changing position of the antenna, differences in signal strength and surrounding
objects, such as trains, transmitters, etc.
●The radio antenna is mounted inside the rear window. To maintain clear radio
reception, do not attach metallic window tinting or other metallic objects to the
antenna wire mounted inside the rear window.
■Receiving XM® Satellite Radio
An XM
® Satellite Radio is a tuner designed exclusively to receive broadcasts pro-
vide under a separate subscription. Availability is limited to the 48 contiguous
states and 10 Canadian provinces.
●XM® subscriptions
For detailed information about XM® Satellite Radio or to subscribe:
U.S.A.-
Visit on the web at www.xmradio.com
or call 1-877-515-3987.
Canada-
Visit on the web at www.xmradio.ca
or call 1-877-515-3987.
●Radio ID
You will need the radio ID when activating XM
® service or reporting a prob-
lem. Select “CH000” using the dial, and the receiver’s 8-character ID
number will appear.
●Satellite tuner
The tuner supports only Audio Services (Music and Talk) and the accompany-
ing Text Information of XM
® Satellite Radio.
*: Terms and services provided by XM® Satellite Radio are subject to change with-
out notice.