air conditioning Lexus GX470 2008 Owner's Guide

357
4-3. Do-it-yourself maintenance
4
Maintenance and care
Fuse layout and amperage ratings■ Engine compartment
FuseAmpereCircuit
1ALT140
Charging system, AM1, HEATER,
CDS FAN, FR FOG, DEFOG, AIR
SUS, AC INV, SEAT HEATER, OBD,
STOP, J/B, RR AC, MIR HEATER,
BAT T C H G, TOW I N G B R K , TOW -
ING
2HEATER50Air conditioning system
3AIR SUS50Rear height control air suspension
4AM150
ACC, CIG, IG1, FR WIP-WSH, RR
WIP, RR WSH, DIFF, ECU-IG,
TEMS, STA
5TOW I N G B R K30Trailer brake controller
6J/B50
P FR P/W, P RR P/W, D RR P/W, D
P/SEAT, P P/SEAT, TAIL, PANEL,
POWER OR TI&TE
7BATT CHG30Tr a i l e r s u b b a t t e r y

358
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
8TOW I NG40Tr a i l e r l i g h t s
9CDS FAN20Electric cooling fan
10RR A/C30Rear air conditioning system
11MIR HEATER10Outside rear view mirror defogger
12STOP10
Stop lights, high mounted stoplight,
shift lock control system, vehicle sta-
bility control system, electronic mod-
ulated suspension, rear height control
air suspension, multiport fuel injec-
tion system/sequential multiport fuel
injection system
13AC INV15Power outlet (115V AC)
14FR FOG15Front fog lights
15OBD7. 5On-board diagnosis system
16HEAD (LO RH)10Right hand headlight (low beam)
17HEAD (LO LH)10Left hand headlight (low beam)
18HEAD (HI RH)10Right hand headlight (high beam)
19HEAD (HI LH)10Left hand headlight (high beam)
20EFI NO.210
Multiport fuel injection system/
sequential multiport fuel injection
system
21HEATER No.27. 5Air conditioning system
22DEFOG30Rear window defogger
23AIRSUS NO.210Rear height control air suspension
24S E AT H E AT E R20Seat heaters

359
4-3. Do-it-yourself maintenance
4
Maintenance and care
FuseAmpereCircuit
25DOME10
Engine switch light, interior lights,
personal lights, foot lights, running
board lights, door courtesy lights,
inside door handle lights, trip infor-
mation display
26RADIO NO.120Audio system, navigation system
27ECU-B10
Multiplex communication system,
vehicle stability control system, wire-
less remote control system, inside
rear view mirror, air conditioning sys-
tem, electronic modulated suspen-
sion, driving position memory system,
power windows, moon roof, rear view
monitor system
28ECU-B NO.210Theft deterrent system
29ABS MTR40
Anti-lock brake system, vehicle sta-
bility control system, active traction
control system, brake assist system
30AM230Starting system, IGN, SRS, GAUGE,
ST2
31ABS SOL30
Anti-lock brake system, vehicle sta-
bility control system, active traction
control system, brake assist system
32ALT-S7. 5Charging system
33MAYDAY7. 5Lexus Link System
34HORN10Horns

362
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
12IG1 NO.210
Rear air conditioning system, inside
rear view mirror, kinetic dynamic sus-
pension system
13RR WSH15Rear window washer
14ECU-IG10
Shift lock control system, power win-
dows, outside rear view mirror defog-
ger, anti-lock brake system, active
traction control system, vehicle stabil-
ity control system, air conditioning
system, navigation system, power
windows, moon roof, tilt and tele-
scopic steering, trip information dis-
play, driving position memory system,
rear view monitor system, tire pres-
sure warning system
15IG110
Air conditioning system, back-up
lights, rear window defogger, seat
heaters, vehicle stability control sys-
tem
16STA7. 5
Multiport fuel injection system/
sequential multiport fuel injection
system
17P FR P/W20Front passenger’s power window
18P RR P/W20Rear right side power window
19D RR P/W20Rear left side power window
20PA N E L10Instrument panel lights
21TA I L10Parking lights, tail lights, license plate
lights, front fog lights

5
When trouble arises
377
5-1. Essential information
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 rough
● 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

408
5-2. Steps to take in an emergency
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: Turn off the engine and carefully lift the hood.
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 immediately and call your local Lexus
dealer.
After the engine has cooled
down sufficiently, check the
coolant level and inspect the
radiator for any leaks.STEP1
STEP2
STEP3
STEP4

429
6-1. Specifications
6
Vehicle specifications
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
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

Index
443
Abbreviation list ............ 444
Alphabetical index ........ 446
What to do if... ............... 455
For details of equipment related to the navigation system
and touch screen, such as the air conditioning, rear view
monitor system and audio systems, refer to the “Naviga-
tion System Owner’s Manual”.

444
Abbreviation list
Abbreviation/Acronym list
ABBREVIVATIONSMEANING
A/CAir Conditioning
ABSAnti-Lock Brake System
ACCAccessory
ALRAutomatic Locking Retractor
CALCalibration
CRSChild Restraint System
DACDownhill Assist control system
DISPDisplay
ECUElectronic Control Unit
EDREvent data recorder
ELREmergency Locking Retractor
GAWRGross Axle Weight Ratings
I/MEmission inspection and maintenance
INTIntermittent
KDSSKinetic Dynamic Suspension System
LEDLight Emitting Diode
LSDLimited Slip Differential
MMTMethylcy clopentadienyl Manganese Tricarbonyl
M + SMud and Snow
MTBEMethyl Tertiary Butyl Ether
OBDOn Board Diagnostics

446
Alphabetical index
Alphabetical index
A/C ............................................................. 192
ABS.............................................................. 159
Active traction control......................... 159
Air conditioning systemAir conditioning filter ....................... 349
Automatic air conditioning system .................................................... 192
Airbags
Airbag operating conditions...........80
Airbag precautions for your child.......................................................... 85
Airbag warning light ........................ 382
Curtain shield airbag precautions .......................................... 87
General airbag precautions ........... 84
Locations of airbags............................. 77
Modification and disposal of airbags ....................................................88
Side airbag precautions .................... 86
Side and curtain shield airbags operating conditions .......................80
SRS airbags .............................................. 77
Alarm ............................................................ 72
Antenna ........................................208, 303
Armrest..................................................... 276
Ashtrays .................................................... 269
Audio system Antenna ..................................................208
CD player/changer .............................211
DVD information ............................... 240
DVD player ............................................ 231
DVD video/audio ............................. 236
MP3/WMA disc .................................218
Optimal use.......................................... 224
Radio ........................................................ 203
Rear sear entertainment
system .................................................... 231 Steering switches .............................. 228
Video CD ..............................................243
Automatic light control system........ 135
Automatic transmission ........................ 121
Back door .....................................................31
Back-up lights Wattage ................................................. 420
Battery Battery .................................................... 333
Checking............................................... 333
If the vehicle battery is
discharged ........................................ 405
Preparing and checking
before winter...................................... 176
Brake
Fluid .......................................................... 330
Parking brake........................................ 125
Brake Assist ............................................. 159
Care Exterior ................................................... 306
Interior.....................................................308
Seat belts ............................................... 309
Cargo capacity....................................... 168
Cargo hooks .......................................... 278
CD player ................................................... 211
Center differentia l lock ........................ 147
Chains ......................................................... 177
Child-protectors...................................... 28
Child restraint system
Definition .................................................. 95
Installation ................................................ 98
Installing CRS with lower anchorages ......................................... 102
Installing CRS with seatbelts ...........99A
B
C