2012 Lexus GX460 air conditioning

656
4-3. Do-it-yourself maintenance
GX460_U.S.A. (OM60J00U)
74WD20 A4WD system, rear differential lock
8P/ S E AT F L30 AFront power seat (left)
9D/ L N O. 225 ADoor lock motor, glass hatch
opener, BODY ECU
10PSB30 APSB ECU
11TI & TE15 ATilt and telescopic steering
12FOG FR15 AFront fog lights
13OBD7. 5 ADLC 3
14A/C7. 5 AAir conditioning system
15AM17. 5 AStarting system
16DOOR RL25 ARear power window (left)
17ECU-IG NO.110 A
Shift lock ECU, VSC ECU, steering
sensor, yaw rate sensor, sequential
switch, auto wiper ECU, back up
relay, tilt & telescopic steering, PSB
ECU, DSS#1 ECU, front radar sensor,
AFS ECU, TIRE PRESS ECU,
DRIVER MON ECU
18IG17. 5 A
Front turn signal light, rear turn signal
light, side turn signal light, meter turn
signal light, trailer light, ALT, VSC, C/
C switch
FuseAmpereCircuit

658
4-3. Do-it-yourself maintenance
GX460_U.S.A. (OM60J00U)
30IGN10 A
EFI ECU, C/OPN RLY, VSC ECU, air
bag ECU, smart entry & start system,
steering lock ECU, CAN gateway
ECU
31GAUGE7. 5 AMeter
32PA N E L7. 5 A
Switch illumination, glove box light,
cup holder lights, auxiliary box light,
navigation system, audio system, air
conditioning system, outside rear view
mirror switch, folding seat switch,
multi-information display, P/SEAT
IND, SHIFT, COOL BOX
33TA I L10 A
Front position lights, tail lights, license
plate lights, EFI ECU, rear fog lights,
towing, front fog lights
FuseAmpereCircuit

5
When trouble arises
683
5-1. Essential information
GX460_U.S.A. (OM60J00U)
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■Visible symptoms
● Fluid leaks under the vehicle
(Water dripping from the air conditioning after use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature gauge needle continually points
higher than normal
■ Audible symptoms
● Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
■ Operational symptoms
● Engine missing, stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, sp ongy feeling, pedal almost touches
the floor

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

774
6-1. Specifications
GX460_U.S.A. (OM60J00U)
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation
pressureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic trans-
mission, power steering, power brakes, power win-
dows, power seats, radio and heater, to the extent
that these items are available as factory-installed
equipment (whether installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil
and coolant, and if so equipped, air conditioning and
additional weight optional engine
Maximum loaded
vehicle weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight

796
6-2. Customization
GX460_U.S.A. (OM60J00U)
Front auto-
matic air
condition-
ing sys-
tem
*1,2
Efficient Venti-
lation Mode
(Enable/disable
switching of the
air intake con-
trol mode to
automatic when
the “AUTO”
switch ON)
OnOffO––O
Auto A/C
Mode
(Enable/disable
automatic oper-
ation of the air
conditioning
compressor
when the
“A U T O ” s w i t c h
ON)
OnOffO––O
ItemFunctionDefault settingCustomized setting

Index
817
GX460_U.S.A. (OM60J00U)
Abbreviation list ..................... 818
Alphabetical index ................. 820
What to do if... ........................ 832
For vehicles with a navigation system, refer to the “Naviga-
tion System Owner’s Manual” for information regarding
the equipment listed below.
• Navigation system
• Audio/video system
• Rear seat entertainment system
• Air conditioning
• Windshield wiper de-icer
• Rear window and outside rear view mirror defogging
• Hands-free system (for cellular phone)
• Intuitive parking assist
• Wide view front & side monitor
• Lexus Enform with Safety Connect

820
GX460_U.S.A. (OM60J00U)
Alphabetical index
Alphabetical index
A/CFront automatic air conditioning
system
*............................................... 392
Rear automatic air conditioning
system
*............................................... 407
ABS.............................................................335
Active traction control........................336
Adaptive front lighting system ........ 223
Adaptive variable suspension system...................................................... 321
AFS ............................................................. 223
Air conditioning filter .......................... 642
Air conditioning system Air conditioning filter ....................... 642
Front automatic air conditioning system
*............................................... 392
Rear automatic air conditioning system
*............................................... 407
Airbags Airbag deployment
conditions............................................. 126
Airbag precautions for your
child......................................................... 132
Airbag warning light ....................... 690
Front passenger occupant classification system........................139
General airbag precautions ............131
Locations of airbags........................... 122
Modification and disposal of airbags ...................................................136
Proper driving posture .....................120
Side airbag precautions ...................133
Side and curtain shield airbags deployment conditions ................. 127
Side and curtain shield airbag precautions .........................................134
SRS airbags ............................................ 122 Alarm............................................................ 117
Antenna .................................................... 420
Anti-lock brake system ...................... 335
Armrest .................................................... 554
Audio input.............................................. 459
Audio system
Antenna.................................................. 420
Audio input........................................... 459
AUX port .............................................. 459
CD player/changer ..........................423
iPod .......................................................... 440
MP3/WMA disc................................. 431
Optimal use ..........................................457
Portable music player ..................... 459
Radio ......................................................... 415
Steering wheel audio switch........ 460
USB memory ...................................... 448
Audio/video remote controls*
Audio/video system*
Automatic air conditioning system
Air conditioning filter ........................642
Front automatic air conditioning system
*...............................................392
Rear automatic air conditioning
system
*.............................................. 407
Automatic light control system.........219
Automatic transmission Automatic transmission ...................186
If the shift lever cannot be shifted from P ................................................... 737
S mode .....................................................189
AUX port
*.............................................. 459
Auxiliary box .............................. 533, 560
AVS..............................................................321
A