2007 Lexus GS450h key battery

102
2-1. Driving procedures
■If the hybrid system does not start
The hybrid vehicle immobilizer system may not have been deactivated. (P.
6 2 )
■When the power switch indicator flashes in amber
The system may be malfunctioning. Have the vehicle inspected by your Lexus
deal

er 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
shi
ft lever in “P” and the brake pedal pressed, contact your Lexus dealer immedi -
ately.
■Auto power OFF function
The power switch will automatically turn OFF when lef
t in “ACC” mode for 1 hour or
more.
■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.
4
■When the hybrid system is malfunctioning
P. 4 4 4
■Electronic key battery depletion
P.
1 8
■When the electronic key battery is discharged
P.
3 9 3
■Conditions affecting operation
P.
1 6
■Leak detection pump
Several hours after the hybrid system is turned off, you may hear a sound coming
fr

om underneath the luggage compartment for several minutes. This is normal
operation and does not indicate a malfunction.

122
2-3. Operating the lights and windshield wipers
■Automatic light off system
The headlights and tail lights turn off 30 seconds after a door is opened or closed if
the power switch has been switched to “ACC” 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 “IG-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 automatica lly 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
Settings (e.g. light sensor sensitivity) can be changed. ( P. 5 0 0 )
NOTICE
■To prevent 12 volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is off.

Maintenance and care4
343
4-1. Maintenance and care ......... 344Cleaning and protecting the 
vehicle exterior........................ 344
Cleaning and protecting the 
vehicle interior......................... 346
4-2. Maintenance ........................... 349 Maintenance 
requirements ............................ 349
General maintena nce .............. 351
Emission inspection and 
maintenance (I/M) 
programs ................................... 354 4-3. Do-it-yourself

maintenance......................... 355
Do-it-yourself service 
precautions ............................... 355
Hood .............................................. 358
Positioning the jack .................. 359
Engine compartment ................ 361
Tires ................................................. 375
Tire inflation pressure .............. 385
Wheels .......................................... 389
Air conditioning filter ............... 391
Electronic key battery ............. 393
Checking and replacing 
fuses ............................................. 395
Headlight aim ................................ 411
Light bulbs..................................... 413

393
4-3. Do-it-yourself maintenance
4
Maintenance and care
Electronic key battery
Replace the battery with a new one if it is discharged.
■You will need the following items:
●F
lathead screwdriver
●Small Phillips-head sc rewd
river
● Lithium batter
y (CR1632)
■ R
eplacing the battery
Take out the mechanical key.
Remove the cover.
Remove the depleted battery.
Insert a new battery with the “+”
terminal facing up.
STEP1
STEP2
STEP3

394
4-3. Do-it-yourself maintenance
■If the electronic key battery is discharged
The following symptoms may occur.
●The smart access system with push-button start and wireless remote control will
not function properly.
●The operational range is reduced.
■Use a CR1632 lithium battery
●Batteries can be purchased at your Lexus dealer, jewelers, or camera stores.
●Replace only with the same or equivalent type recommended by a Lexus dealer.
●Dispose of used batteries according to the local laws.
CAUTION
■Removed battery and other parts
Keep away from children. 
These parts are small and if swallowed by a child they can cause choking.
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents.
●Always work with dry hands.
Moisture may cause the battery to rust.
●Do not touch or move any other comp onents inside the electronic key.
●Do not bend the battery terminals.

When trouble arises5
419
5-1. Essential information ........... 420If your vehicle needs to be 
towed........................................... 420
If you think something is 
wrong .......................................... 427
Event data recorder ................. 428 5-2. Steps to take in an

emergency............................ 430
If a warning light turns on or a 
warning buzzer sounds............ 430
If a warning message is 
displayed.................................... 436
If you have a flat tire 
(Vehicles with run-flat 
tires) ............................................. 455
If you have a flat tire 
(Vehicles with standard 
tires) ............................................. 456
If the hybrid system will not 
start .............................................. 466
If the shift lever cannot be 
shifted from P........................... 467
If you lose your keys ................. 468
When the electronic key  battery is discharged ............ 469
If the 12 volt battery is 
discharged .................................. 471
If your vehicle overheats ........ 475
If the vehicle becomes 
stuck ............................................ 478

5
When trouble arises
453
5-2. Steps to take in an emergency
InteriorbuzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection procedure
Once3 times
(Flashing)
An open door
other than the
driver's door is
closed while the
electronic key is
outside the detec-
tion range and the
power switch is in
“ACC” or “IG-
ON” mode with
the shift lever in
“P”.
Tu r n t h e
power
switch
“OFF” or
confirm the
location of
the elec-
tronic key.
Contin-
uousContin-
uous
(Displayed alternately)
(Flashing)
An open door
other than the
driver's door is
closed while the
electronic key is
outside the detec-
tion range and the
power switch is in
“ACC” or “IG-
ON” mode with
the shift lever not
in “P”.
•Shift the shift lever
to “P”.
•Confirm the loca-
tion of the
electronic
key.
Once
(Flashing)
The electronic key
battery is low.Replace the
battery.
( P. 393)

466
5-2. Steps to take in an emergency
If the hybrid system will not start
If the hybrid system will not start even though correct starting procedures
are being followed (
P. 1 0 1), consider each of the following points.
■The hybrid system will not start ev en if you are carrying the cor-
rect electronic key
One of the following may be the cause of the problem.
● The electr
onic key battery may be discharged. ( P. 1 8 )
● Ther
e may not be sufficient fuel in the vehicle’s tank. 
Add fuel to the vehicle.
● Ther
e may be a malfunction in the steering lock system.
● Ther
e may be a malfunction in the hybrid vehicle immobilizer sys -
tem. 
( P. 6 2 )
■ The interior lights and headlights ar
e dim, or the horn does not
sound or sounds at a low volume
One of the following may be the cause of the problem.
● The 12 v
olt battery may be discharged. ( P. 471)
● The 12 v
olt battery terminal connections may be loose or cor -
roded.
■ The interior lights and headlights do not turn on, or the horn does
not sound
One of the following may be the cause of the problem.
●One or both of the 12 v
olt battery terminals may be discon -
nected.
● The 12 v
olt battery may be discharged. ( P. 471)
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.