2012 Lexus GX460 cooling

657
4-3. Do-it-yourself maintenance
4
Maintenance and care
GX460_U.S.A. (OM60J00U)
19ECU-IG NO.210 A
Rear window defogger, outside rear
view mirror memory, seat heater/ven-
tilator switch, inverter relay, air condi-
tioning system, EC mirror, BODY
ECU, exhaust gas sensor, parking
assist sensor, navigation system,
DSS#2 ECU, meter switch, accessory
meter, folding seat ECU, O/H IG,
head light cleaner, rear air condition-
ing system, deicer, D-module, rain
sensor, air suspension, RR VLV ECU,
steering heater, LKA, P/SEAT IND
20S/HTR FR20 ASeat heater and ventilator
21P/ S E AT F R30 AFront power seat (right)
22DOOR P30 A
Front power window (passenger’s
side), outside rear view mirror mem-
ory
23DOOR10 APo w e r w i n d o w
24DOOR D25 AFront power window (driver’s side)
25DOOR RR25 ARear power window (right)
26S/ROOF25 AMoon roof
27WIP30 AWindshield wipers and washer
28WA S H E R20 AWindshield wipers and washer, rear
window wipers and washer
29COOLING10 ACool box
FuseAmpereCircuit

5
When trouble arises
743
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable
gas that may be emitted from the battery:
●Make sure the jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any part other than the intended terminal.
●Do not allow the + and - clamps of the jumper cables to come into contact with
each other.
●Do not smoke, use matches, cigarette lighters or allow open flame near the bat-
tery.
■Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead compounds. Observe the following precautions when han-
dling the battery:
●When working with the battery, always wear safety glasses and take care not to
allow any battery fluids (acid) to come into contact with skin, clothing or the vehi-
cle body.
●Do not lean over the battery.
●If the battery fluid comes into contact with the skin or eyes, immediately wash the
affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medical attention can be
received.
●Always wash your hands after handling the battery support, terminals, and other
battery-related parts.
●Do not allow children near the battery.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure that they do not become entangled in
the cooling fans or belt.

744
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
If your vehicle overheats
If the engine overheats:
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 engine. Carefully lift the hood after the steam sub-
sides and then restart the engine.
If you do not see steam: Leave the engine running and carefully lift the hood.
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 engine.
If the fan is not operating: Stop the engine and call your local Lexus dealer.STEP1
STEP2
STEP3

757
6-1. Specifications
6
Vehicle specifications
GX460_U.S.A. (OM60J00U)
Cooling system
Ignition system
Capacity
(reference)
With rear
heater16.3 qt. (15.4 L, 13.6 Imp.qt.)
Without rear
heater14.5 qt. (13.7 L, 12.1 Imp.qt.)
Coolant type
Use either of the following:• “Toyota Super Long Life Coolant”
• A similar high-quality ethylene glycol-
based non-silicate, non-amine, non-nitrite,
and non-borate coolant with long-life
hybrid organic acid technology
Do not use plain water alone.
Spark plug
MakeDENSO SK20HR11
Gap0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

822
Alphabetical index
GX460_U.S.A. (OM60J00U)
Child-protectors ....................................... 51
CleaningExterior .................................................. 588
Interior .....................................................593
Seat belts................................................594
Clock
*..................................................... 540
Coat hooks ............................................. 555
Coin holder .............................................528
Compass .................................................. 575
Condenser ............................................... 618
Console box ...........................................526
Conversation mirror ............................ 541
Cool box...................................................535
Cooling system Engine overheating .......................... 744
Cornering assist sensors ................... 266
Crawl Control........................................328
Cruise control
Cruise control ..................................... 246
Dynamic radar cruise control .....250
Cup holders ........................................... 530
Curtain shield airbags.......................... 122
Customizable features .......................782
Daytime running light system .......... 224
DAC...........................................................332
Defogger Rear window............................................411
Side mirror ................................................411
Dimension ................................................ 752
Dinghy towing ....................................... 389 Display
Dynamic radar cruise control..... 250
Multi-information display........................................ 204, 212
Trip information........................ 204, 212
Warning message ............................ 700
Do-it-yourself maintenance ............. 603
Door courtesy lights Door courtesy lights .......................... 519
Wattage ..................................................763
Door pocket ........................................... 529
Doors Back door .................................................53
Power windows .....................................101
Door lock .........................................47, 50
Rear door child protector.................. 51
Side doors................................................ 50
Side mirrors.............................................. 97
Downhill assist control system ........ 332
Driver’s seat belt reminder light ..... 692
Driving Correct posture................................... 120
Off-road precautions...................... 353
Procedures............................................. 168
Winter driving tips ............................ 366
Driving position memory...................... 78
D