Page 439 of 599
437
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_HV_U
June 19, 2008 1:15 pm
■How to initialize the tire pressure warning system
Park the vehicle in safe place and turn the “POWER” switch to
OFF.
While the vehicle is moving, initialization is not performed.
Adjust the tire inflation pressure to the specified cold tire inflation
pressure level. ( →P. 5 5 1 )
Make sure to adjust the tire pressure to the specified cold tire inflation
pressure level. The tire pressure warning system will operate based on
this pressure level.
Turn the “POWER” switch to ON mode.
Push and hold the tire pressure
warning reset switch until the tire
pressure warning light blinks
slowly three times and the mes-
sage “PRESSURE INITIAL”
appears on the multi-information
display.
Wait for a few minutes with the ON mode, and then turn
“POWER” switch to the OFF.
STEP1
STEP2
STEP3
STEP4
STEP5
GS450h_HV_U.book Page 437 Thursday, June 19, 2008 1:44 PM
Page 443 of 599

441
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_HV_U
June 19, 2008 1:15 pm
■Initializing the tire pressure warning system
Initialize the tires with the tire inflation pressure adjusted to the specified level.
■If you push the tire pressure warning reset switch accidentally
If initialization is performed, adjust the tire inflation pressure to the specified level
and initialize the system again.
■When the initialization of the tire pressure warning system has failed
Initialization can be completed in a few minutes. However, in the following cases,
the settings have not been recorded and the system will not operate properly. If
repeated attempts to record tire inflation pressure settings are unsuccessful, have
the vehicle inspected by your Lexus dealer.
●When operating the tire pressure warning reset switch, the tire pressure warn-
ing light does not flash 3 times and the setting message does not appear on the
multi-information display.
●After carrying out the initialization procedure, the tire pressure warning light
blinks for 1 minute then stays on after driving for 20 minutes.
■Routine tire inflation pressure checks
The tire pressure warning system does not replace routine tire inflation pressure
checks. Make sure to check tire inflation pressure as part of your routine of daily
vehicle checks.
GS450h_HV_U.book Page 441 Thursday, June 19, 2008 1:44 PM
Page 483 of 599

When trouble arises5
481
GS_HV_U
December 12, 2007 3:30 pm
5-1. Essential information..... 482If your vehicle needs to be towed ........................... 482
If you think something is wrong ..................................... 488
Event data recorder .............. 489 5-2. Steps to take in an
emergency .................... 491
If a warning light turns on or a warning buzzer sounds... ... 491
If a warning message is displayed................................ 500
If you have a flat tire (Vehicles with standard tires) ............... 517
If you have a flat tire (Vehicles with run-flat tires)................ 527
If the hybrid system will not start .................................. 528
If the shift lever cannot be shifted from “P”.................... 529
If you lose your keys .............. 530
If the electronic key does not operate properly........... 531
If the 12 volt battery is discharged ............................ 534
If your vehicle overheats ..... 538
If the vehicle becomes stuck......................................... 541
GS450h_HV_U.book Page 481 Thursday, June 19, 2008 1:44 PM
Page 496 of 599

494
5-2. Steps to take in an emergency
GS_HV_U
June 19, 2008 1:15 pm
*3: Open door warning buzzer:
→P. 5 0 5
*
4: Driver’s and front passenger’s seat belt reminder buzzer:
The driver’s and front passenger’s seat be lts reminder sounds to alert the driver
and front passenger that his or her seat belt is not fastened. The buzzer sounds
intermittently for 10 seconds after the ve hicle has reached a speed of at least 12
mph (20 km/h). Then, if the seat belt is still unfastened, the buzzer will sound in
a different tone for 20 more seconds.
Warning lightWarning light/DetailsCorrection procedure
Master warning light
A buzzer sounds and the
warning light comes on and
flashes to indicate that the
master warning system has
detected a malfunction.
Take appropriate action in
accordance with the message
displayed on the multi-infor-
mation display.
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is your vehicle low on gas?
If it is, refuel the vehicle immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after taking several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon
as possible.
GS450h_HV_U.book Page 494 Thursday, June 19, 2008 1:44 PM
Page 502 of 599

500
5-2. Steps to take in an emergency
GS_HV_U
June 19, 2008 1:15 pm
If a warning message is displayed
Stop the vehicle immediately.
A buzzer sounds and a warning message is shown on the multi-informa-
tion display. The following warnings indicate the possibility of damage to
the vehicle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Lexus dealer.
Wa r n i n g m e s s a g eDetails
(Flashing)
Abnormal engine oil pressure. The warning light may turn on if the engine oil pres-
sure is too low.
Malfunction in the hybrid system.
If a warning is shown on the multi-information display, stay calm and per-
form the following actions:
Multi-information display
Master warning light
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the
multi-information display.
If any of the warning light turns on again after performing the following
actions, contact
your Lexus dealer.
GS450h_HV_U.book Page 500 Thursday, June 19, 2008 1:44 PM
Page 503 of 599
5
When trouble arises
501
5-2. Steps to take in an emergency
GS_HV_U
June 19, 2008 1:15 pm
Have the vehicle inspected immediately.
A buzzer sounds and a warning message is shown on the multi-informa-
tion display. Failing to investigate the cause of the following warnings 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
Malfunction in the automatic headlight leveling sys-
tem.
Malfunction in the rear lights system.
Malfunction in the tire pressure warning system. The tire pressure warning light comes on after blink-
ing for 1 minute.
(Flashing)
Malfunction in the steering lock system.
GS450h_HV_U.book Page 501 Thursday, June 19, 2008 1:44 PM
Page 504 of 599
502
5-2. Steps to take in an emergency
GS_HV_U
June 19, 2008 1:15 pm
Wa r n i n g m e s s a g eDetails
(If equipped)
Intuitive parking assist malfunction.The malfunctioning sensor is shown flashing on the
display.
(If equipped)
Malfunction in the active stabilizer suspension sys-
tem.
(If equipped)
Malfunction in the PCS.
(Flashing)
(If equipped)
Malfunction in the radar cruise control system. Stop the vehicle in a safe place. Turn the “POWER”
switch to OFF and then to ON mode again to reset
the cruise control system.
GS450h_HV_U.book Page 502 Thursday, June 19, 2008 1:44 PM
Page 506 of 599
504
5-2. Steps to take in an emergency
GS_HV_U
June 19, 2008 1:15 pm
Have the vehicle inspected immediately.Failing 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.
*: Electronically Controlled Brake System
Wa r n i n g m e s s a g eDetails
Malfunction in the TRAC, VSC or hill-start assist con-
trol system. “CHECK ECB
*” may be displayed at the same time,
or on its own.
(U.S.A.)
(Canada)
Malfunction in the ABS or brake assist system.
“CHECK ECB*” may be displayed at the same time,
or on its own.
Malfunction in the VGRS.
(If equipped, steering guide symbol and
arrows are flashing)
The steering sensor cable is broken and signals can-
not be received.
GS450h_HV_U.book Page 504 Thursday, June 19, 2008 1:44 PM