2007 Lexus GS450h check engine

5
When trouble arises
451
5-2. Steps to take in an emergency
Wa r n i n g m e s s a g eDetailsCorrection procedure
The engine oil level is low.Check the engine oil level,
and add if necessary.
(U.S.A. only)
The engine oil is sched-
uled to be changed.
Check the engine oil, and
change if necessary.
Comes on approximately
4500 miles (7200 km)
after the engine oil is
changed. (The indicator
will not work properly
unless the oil mainte-
nance data has been
reset).
(U.S.A. only)
The engine oil should be
changed.
Check and change the
engine oil.
Comes on approximately
5000 miles (8000 km)
after the engine oil is
changed (and the oil
maintenance data has
been reset).

5
When trouble arises
477
5-2. Steps to take in an emergency
■To prevent 12 volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
●Turn off any unnecessary electrical compon ents when the vehicle is running at a
low speed for an extended period, such as in heavy traffic, etc.
■When the 12 volt battery is removed or discharged
The hybrid system may not start. ( P. 3 8 0 )
Also, the following systems must be initialized.
●Po w e r w i n d o w s (P. 5 1 )
●Variable gear ratio steering (P. 1 5 3 )
●Tire pressure warning system (P. 3 8 5 )
●Intuitive parking assist (P. 1 5 3 )
Maintain the engine speed on th e second vehicle and turn the
power switch to the “IG-ON” mo de, then start the vehicle’s
hybrid system.
Make sure the “READY” light co mes on. If the light does not
come on, contact your Lexus dealer.
Once the vehicle’s hybrid system has started, remove the
jumper cables in the exact reverse order in which they were
connected.
Once the hybrid system starts, have the vehicle checked at your Lexus
dealer as soon as possible.STEP5
STEP6
STEP7

480
5-2. Steps to take in an emergency
If your vehicle overheats
■Electric motor (traction motor) and inverter
If the message “HYBRID SYSTEM OVERHEAT” is displayed on the
multi-information display.
■ Gasoline engine
If the needle of the engine co olant temperature gauge enters the
red zone, the gasoline engine has probably overheated.
Observe the following steps:
Stop the vehicle in a safe place and turn off the automatic air
conditioning system.
Check to see if steam is coming out from under the hood.
If you see steam: 
Stop the hybrid system and carefully lift the hood.
If you do not see steam: Leave the hybrid system running and carefully lift the hood.
Remove the engine compartment cover. ( P. 370)
Check to see if the cooling fan is operating.
If the fan is operating: 
Wait until the engine coolant temperature gauge begins to
fall and then stop the hybrid system.
If the fan is not operating: 
Stop the hybrid system immed iately and call your local
Lexus dealer.
After the hybrid system has
cooled down sufficiently, check
the coolant level and inspect the
radiator core (radiator) for any
leaks.
STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
481
5-2. Steps to take in an emergency
■Overheating
In the following situations, your vehicle may be overheating.
●The message “HYBRID SYSTEM OVERHEAT” is displayed on the multi-infor-
mation display.
●The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
●Steam is coming from under the hood.
CAUTION
■To prevent an accident or injury when in specting under the hood of your vehicle
●Keep hands and clothing away from the fan and engine drive belt while the hybrid
system is running.
●Do not loosen the radiator cap while the hybrid system and radiator are hot. 
Serious injury, such as burns, may resu lt from hot coolant and steam released
under pressure.
Add coolant if required.
Water can be used in an emer-
gency measure if coolant is
unavailable. ( P. 4 9 0 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

520
Alphabetical index
Emergency, in case ofIf a warning light turns on ..............438
If a warning message is 
displayed ............................................ 444
If the hybrid system will not 
start.......................................................... 471
If the shift lever cannot be  shifted from P ....................................472
If the 12 volt battery is 
discharged ....................................... 476
If you have a flat tire .............. 460, 461
If you lose your keys......................... 473
If you think something is 
wrong ................................................... 435
If your vehicle becomes stuck.....483
If your vehicle needs to be 
towed ................................................... 428
If your vehicle overheats ............... 480
When the electronic key battery 
is discharged .................................... 474
Energy monitor............................................ 6
Engine Compartment .....................................369
Hood........................................................366
How to start the hybrid system ... 103
If the hybrid system will not 
start.......................................................... 471
Overheating........................................ 480
Power switch ........................................ 103
Engine compartment cover .............370
Engine coolant temperature 
gauge......................................................... 112
Engine/inverter coolant Capacity .................................................490
Checking ............................................... 376
Preparing and checking before winter ...................................... 176 Engine oil
Capacity ................................................ 489
Checking................................................. 371
Preparing and checking 
before winter...................................... 176
Engine oil maintenance data ........... 374
EPS (Electric Power Steering) .........164
Event data recorder ............................ 436
First-aid kit storage belt ..................... 327
Floor mats ................................................ 326
Fluid Brake ....................................................... 378
Washer................................................... 382
Fog lights Switch ........................................................ 125
Wattage ................................................. 494
Foot light .................................................. 304
Front passenger occupant 
classification system ............................. 77
Front passenger's seat belt 
reminder light ..................................... 440
Front seats Adjustment ...............................................33
Driving position memory ..................35
Front turn signal lights Wattage ................................................. 494
Fuel Capacity ................................................ 488
Fuel gauge ................................................ 112
Gas station information ................. 528
Information ........................................... 495
Refueling ................................................... 55
Messages .............................................. 456
Fuel filler door ........................................... 55
Fuses .......................................................... 403
F

525
Alphabetical index
ECB/VSC (Electronically 
Controlled Brake System/ 
Vehicle Stability Control) .......... 439
Electric power steering  warning light ..................................... 439
Low fuel level....................................... 440
Malfunction indicator lamp .......... 439
Master warning light .......................... 441
Open door ........................................... 440
Pre-collision system ......................... 439
Seat belt reminder light .................. 440
SRS airbags .......................................... 439
Tire pressure warning light........... 440
Warning messages Anti-lock Brake System (ABS) .. 448
Brake Assist (BA) ............................. 448
Dynamic radar cruise control ................................... 446
Engine oil level ...................................... 451
Engine oil maintenance.................... 451
Engine oil pressure........................... 444
Headlight ............................................... 445
Hill-start assist control..................... 448
Hood ....................................................... 449
Hybrid system ......................... 444, 453
Intuitive parking 
assist .............................446, 452, 456
Moon roof ............................................. 450
Open door ........................................... 449
Parking brake ...................................... 450
Pre-Collision System .......... 446, 452
Refueling ................................................ 456
Rear lights system ............................. 445
Smart access system with 
push-button start............................ 457
Steering lock ............................445, 459 Tire pressure warning

system ..................................... 445, 452
TRAC (Traction control 
system)................................................ 448
Trunk ....................................................... 450
VGRS (Variable Gear Ratio 
Steering) ............................................ 448
VSC/ECB (Vehicle Stability 
Control/Electronically Controlled 
Brake system) ................................. 448
Washer fluid ........................................ 450
Washer Checking ...............................................382
Preparing and checking 
before winter ......................................176
Switch.........................................................126
Washing and waxing ........................... 352
Weight Cargo capacity ..................................... 172
Load limits ...............................................175
Weight.................................................... 486
Wheels ...................................................... 397
Window glasses ......................................50
Window lock switch ...............................50
Windows Power windows .................................... 50
Rear window defogger.................... 199
Washer .....................................................126
Windshield wipers Position..................................................... 178
Windshield wipers ..............................126
Winter driving tips ..................................176
Wireless remote control Locking/Unlocking ............................. 22
Replacing the battery........................ 401
WMA disc ............................................... 224