2010 Lexus GS450h check engine

550
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
Wa r n i n g m e s s a g eDetailsCorrection procedure
(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).
(If equipped)
Intuitive parking assist is
dirty or covered with ice.Clean the sensor.
(Flashing)
(If equipped)
The PCS is not currently
functional.
• Clean the grille and the
sensor.
• This message appears
when the pre-collision
system is hot. In this case,
wait until the system
cools down.
(Flashing)
(If equipped)
The radar cruise control
sensor is dirty or covered
with ice.
Clean the sensor.

5
When trouble arises
579
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■Starting the hybrid system when the 12 volt battery is discharged
The hybrid system cannot be started by push-starting.
■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 components 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. 4 7 1 )
Also, the intuitive parking assist must be initialized. (
P. 555)
Start the engine of the second vehicle. Increase the engine
speed slightly and maintain at that level for approximately 5
minutes to recharge the 12 volt battery of your vehicle.
Open and close any of the doors with the “POWER” switch is
OFF.
Maintain the engine speed on the second vehicle and turn the
“POWER” switch to the ON mode, then start the vehicle’s
hybrid system.
Make sure the “READY” light comes 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.STEP4
STEP5
STEP6
STEP7
STEP8

5
When trouble arises
581
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
If your vehicle overheats
If your hybrid system overheats:
Stop the vehicle in a safe place and turn off the air conditioning
system.
Check to see if steam is coming out from under the hood.
If you see steam: 
Stop the hybrid system. Carefully lift the hood after the
steam subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the
hood.
Remove the engine compartment cover. (P. 4 6 1 )
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 immediately and call your 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

582
5-2. Steps to take in an emergency
GS_HV_U (OM30C81U)
October 13, 2015 12:41 pm
■Overheating
In the following situations, your vehicle may be overheating.
●The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
●Steam is coming from under the hood.
●The message “HYBRID SYSTEM OVERHEAT” is displayed on the multi-infor-
mation display.
CAUTION
■To prevent an accident or injury when inspecting under the hood of your vehicle
●If steam is seen coming from under the hood, do not open the hood until the
steam has subsided. The engine compartment may be very hot, causing serious
injury such as burns.
●Keep hands and clothing away from the fan and engine drive belt while the hybrid
system is operating.
●Do not loosen the radiator cap while the hybrid system and radiator are hot.
Serious injury, such as burns, may result from hot coolant and steam released
under pressure.
Add coolant if necessary.
Water can be used in an emer-
gency measure if coolant is
unavailable. (P. 5 9 3 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

631
Alphabetical index
GS_HV_U (OM30C81U)
February 1, 2010 11:29 am
Back-up lights
Wattage ................................................. 597
Battery
12 volt battery ...................................... 470
Checking ............................................... 470
Hybrid battery 
(Traction battery) .............................. 28
If the 12 volt battery is 
discharged ........................................ 578
Preparing and checking 
before winter .................................... 233
Bluetooth
® audio ................................... 321
Bluetooth® phone ............................... 345
Brake
Fluid .......................................................... 468
Parking brake ........................................159
Brake assist ............................................... 214
Care
Exterior ....................................................442
Interior..................................................... 445
Seat belts ............................................... 446
Cargo capacity ..................................... 228
Cargo hooks ............................................ 421
CD player/changer ............................ 282
Chains........................................................234
Child-protectors ......................................56
Child restraint system
Definition.................................................. 124
Installation................................................ 128
Installing CRS with lower 
anchors ................................................. 129
Installing CRS with seatbelts ...........131
Installing CRS with top straps .......135Child safety
Airbag precautions .............................. 114
Battery precautions ............. 472, 580
Child restraint system ........................124
Child-protectors ...................................56
How your child should wear 
the seatbelt............................................ 78
Installing child restraints................... 128
Moon roof precautions...................... 93
Power window lock switch .............. 87
Power window precautions ............89
Removed electronic key battery 
precautions....................................... 495
Seat belt comfort guide ..................... 76
Seat belt precautions .......................... 79
Seat heater precautions.................. 414
Trunk precautions................................. 62
Cigarette lighter....................................... 411
Cleaning
Exterior.................................................... 442
Interior .....................................................445
Seat belts ................................................446
Clock ........................................................ 408
Coin holder .............................................403
Compass .................................................. 429
Condenser ..............................................468
Console box ............................................ 401
Cooling system
Engine overheating............................ 581
Cruise control
Cruise control......................................... 181
Dynamic radar cruise control....... 185
Cup holders ............................................404
Curtain shield airbags.......................... 107
Customizable features ........................ 615
B
C

633
Alphabetical index
GS_HV_U (OM30C81U)
February 1, 2010 11:29 am
Engine compartment cover............... 461
Engine coolant temperature 
gauge ........................................................ 161
Engine/power control unit coolant
Capacity................................................. 593
Checking ............................................... 466
Preparing and checking 
before winter .................................... 233
Engine oil
Capacity...................................................591
Checking ............................................... 462
Preparing and checking 
before winter .................................... 233
Engine oil maintenance data ............464
Enhanced vehicle stability 
control .................................................... 214
Event data recorder............................ 532
First-aid kit storage belt....................... 421
Floor mats.................................................. 419
Fluid
Brake ....................................................... 468
Washer ....................................................474
Fog lights
Switch ........................................................ 174
Wattage ................................................. 597
Foot light .................................................. 395
Front passenger occupant 
classification system ........................... 119
Front passenger’s seat belt 
reminder light ......................................537
Front seats
Adjustment .............................................. 65
Driver’s seat position memory .......67
Front turn signal lights
Wattage ................................................. 597Fuel
Capacity ................................................ 590
Fuel gauge................................................ 161
Gas station information ..................644
Information ........................................... 598
Refueling.................................................... 94
Messages .............................................. 554
Fuel door ..................................................... 94
Fuel filler door ........................................... 94
Fuses .......................................................... 496
Garage door opener .......................... 423
Gas station information...................... 644
Gauges ........................................................ 161
Glove box ............................................... 400
Hands-free system
(for cellular phone) ..........................345
Head restraints ......................................... 72
Headlight aim ............................................511
Headlight cleaner .................................. 180
Headlights
Adaptive front lighting system....... 172
Discharge headlights 
precautions....................................... 520
Replacing light bulbs ......................... 514
Switch.......................................................... 171
Wattage ..................................................597
Heaters
Seat heaters ........................................... 413
Side mirror............................................ 268
Hill-start assist control ......................... 214
Hood .......................................................... 457
Hooks
Cargo ........................................................421
Shopping bag ........................................421
F
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