Lexus GX470 2003 Audio System /

CHASSIS
438
Tire chain selection
 1 Side chain2 Cross chain
Use the tire chains of correct size.
For P265/65R17 tires, use the following type chains. mm (in.)
A: Diameter of side chain 5.0 (0.20)
B: Width of side chain 18.0 (0.71)
C: Length of side chain 46.0 (1.81)
D: Width of cross chain 22.6 (0.89)
E: Length of cross chain 38.1 (1.5)
F: Diameter of cross chain 6.3 (0.25) Regulations regarding the use of tire chains vary
according to location or type of road. Always check the
local regulations before installing chains.
NOTICE
If the wrong combination of tire and chain is used, the
chains could damage the vehicle body.

CHASSIS
439
Chain installation
Install the chains on the rear tires as tightly as possible.
Do not use tire chains on the front tires. Retighten chains
after driving 0.5 1.0 km (1/4 1/2 mile).
When installing chains on your tires, carefully follow the
instructions of the chain manufacturer.
CAUTION
Do not exceed 50 km/h (30 mph) or the chain
manufacturer’s recommended speed limit,
whichever is lower.
 Drive carefully avoiding bumps, holes, and sharp
turns, which may cause the vehicle to bounce.
 Avoid sharp turns or lockedwheel braking, as use of
chains may adversely affect vehicle handling.
 When driving with chains installed, be sure to drive
carefully. Slow down before entering the curves to
avoid losing control of the vehicle. Otherwise an
accident may occur.
NOTICE
When jacking up or installing tire chains, be sure to turn
off the rear height control air suspension with the
“HEIGHT CONTROL OFF” switch and stop the engine.
Otherwise, the vehicle height may change because of
the automatic leveling function resulting in accident.
REPLACING WHEELS
When to replace your wheels
If you have wheel damage such as bending, cracks or
heavy corrosion, the wheel should be replaced.
If you fail to replace damaged wheels, the tire may slip off the
wheel or cause loss of handling control.
Replacement with used wheels is not recommended as they
may have been subjected to rough treatment or high mileage
and could fail without warning. Also, bent wheels which have
been straightened may have hidden structural damage and
therefore should not be used. Never use an inner tube in a
leaking wheel which is designed for a tubeless tire.
Wheel selection
When replacing wheels, care should be taken to ensure
that they are equivalent to those removed in load capacity,
diameter, rim width, and offset.
Correct replacement wheels are available at your Lexus
dealer.
A wheel of a different size or type may adversely affect
handling, wheel and bearing life, brake cooling,
speedometer/odometer calibration, stopping ability, headlight
aim, bumper height, vehicle ground clearance, and tire or snow
chain clearance to the body and chassis.

CHASSIS
440
CAUTION
Observe the following instructions. Otherwise, an
accident may occur resulting in death or serious
injuries.
Do not use wheels other than the manufacturer’s
recommended size, as this may cause dangerous
handling characteristics resulting in loss of control.
 Do not use wheels of different brands, sizes and
types, as this may cause dangerous handling
characteristics resulting in loss of control.
ALUMINUM WHEEL PRECAUTIONS
When installing aluminum wheels, check that the wheel nuts
are tight after driving your vehicle the first 1600 km (1000
miles).
 If you have rotated, repaired, or changed your tires, check
that the wheel nuts are still tight after driving 1600 km (1000
miles).
 When using tire chains, be careful not to damage the
aluminum wheels.
 Use only the Lexus wheel nuts and wrench designed for
your aluminum wheels.
 When balancing your wheels, use only Lexus balance
weights or equivalent and a plastic or rubber hammer.
 As with any wheel, periodically check your aluminum
wheels for damage. If damaged, replace immediately.

CHASSIS
441
SUSPENSION AND CHASSIS
CAUTION
Do not modify the suspension/chassis with lift kits,
spacers, springs, etc. It can cause dangerous handling
characteristics, resulting in loss of control.

SECTION 6 – 4
442
SERVICE PROCEDURES AND
SPECIFICATIONS
Electrical components
Specifications443
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . .
Checking battery condition 447
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery recharging precautions 450
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking and replacing the blade type fuses 450
. . . . . . . . . . . . . . . .
Checking the cartridge type fuses 453
. . . . . . . . . . . . . . . . . . . . . . . . . .
Adding washer fluid 454
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.
Replacing light bulbs 455
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ELECTRICAL COMPONENTS
443
SPECIFICATIONS
FUSE LOCATIONS
64PY003
 1 Engine compartment

2 Driver’s side instrument panel FUSES
Engine compartment

ELECTRICAL COMPONENTS
444
 Driver’s side instrument panel
No.FUSEAMPERECIRCUIT
1 SPARE10Spare fuse
2 ALT140
Charging system and all
components in “AM1”,
“HEATER”, “CDS FAN”, “FR
FOG”, “DEFOG”, “AIR SUS”,
“AC115V INV”, “SEAT HEATER”,
“BATT CHG”, “BRAKE CTRL”
and “TOWING” fuses
3 SPARE15Spare fuse
4 HEATER50Air conditioning system
5 AIR
SUS50Rear height control air suspen-
sion
6 AM150
All components in “ACC”, “CIG”,
“IG1”, “FR WIP −WSH”, “RR
WIP”, “RR WSH”, “DIFF”,
“TEMS” and “STA” fuses
7 BRAKE
CTRL30Trailer brake controller
8 J/B50
All components in “P FR P/W”,
“P RR P/W”, “D RR P/W”, “D
P/SEAT”, “P P/SEAT”, “TAIL”,
“PANEL” and “POWER OR
TI&TE” fuses
9 BATTCHG30Trailer sub battery
10 TOWING40Trailer lights
11 CDS FAN20Electric cooling fan
12 RR A/C30Rear air conditioning system

ELECTRICAL COMPONENTS
445
No.FUSEAMPERECIRCUIT
13 MIR
HEATER10Outside rear view mirror defog-
ger
14 STOP10
Stop lights, high m ounted
stoplight, shift lock control
system, vehicle skid control
system, electronic m odulated
suspension, rear height control
air suspension, multiport fuel
injection system/sequential
multiport fuel injection system
15 AC115V
INV15Power outlet (115 VAC)
16 FR FOG15Front fog lights
17 OBD7.5On −board diagnosis system
18 HEAD
(LO RH)10Right− hand headlight (low beam)
19 HEAD
(LO LH)10Left− hand headlight (low beam)
20 HEAD
(HI RH)10Right− hand headlight (high
beam)
21 HEAD
(HI LH)10Left− hand headlight (high beam)
22 EFI NO.210Multiport fuel injection system/
sequential multiport fuel injection
system
23 HEATER
NO.27.5Air conditioning system
24 DEFOG30Rear window defogger
No.FUSEAMPERECIRCUIT
25 AIRSUSNO.210Rear height control air suspen-
sion
26 SEAT
HEATER20Seat heaters
27 DOME10
Ignition switch light, interior
lights, personal lights, foot
lights, running board lights,
door courtesy lights, inside
door handle lights,
multi− information display
28 RADIO
NO.120Car audio system, navigation
system
29 ECUB10
Multiplex communication
system, vehicle skid control
system, wireless remote
control system, inside rear
view mirror, air conditioning
system, electronic modulated
suspension, driving position
memory system, power
windows, moon roof
30 ECUB NO.210Theft deterrent system
31 ABS
MTR40
Anti −lock brake system,
vehicle skid control system,
active traction control system,
brake assist system
32 AM230Starting system, all components
in “IGN”, “SRS”, “GAUGE” and
“ST2” fuses

ELECTRICAL COMPONENTS
446
No.FUSEAMPERECIRCUIT
33 ABSSOL50
Anti −lock brake system,
vehicle skid control system,
active traction control system,
brake assist system
34 ALTS7.5Charging system
35 MAYDAY7.5Lexus link system
36 HORN10Horns
37 TRNHAZ15Turn signal lights
38 ETCS10Electronic throttle control system
39 EFI20Multiport fuel injection
system/sequential multiport fuel
injection system
40 D FR P/W20Power window
41 DR/LCK25Power door lock
42 TOWING30Towing converter
43 RADIO
NO.230Car audio system, navigation
system
44 IGN10
Multiport fuel injection
system/sequential multiport fuel
injection system, vehicle skid
control system
45 SRS10SRS airbag system
46 GAUGE7.5Gauges and meters
47 ST27.5Multiport fuel injection
system/sequential multiport fuel
injection system
No.FUSEAMPERECIRCUIT
48 FR
WIPWSH30Windshield wipers, windshield
washer
49 TEMS20Electronic modulated suspen-
sion
50 DIFF20Four−wheel drive system
51 RR WIP15Rear window wiper
52 D P/SEAT30Driver’s power seats
53 P P/SEAT30Front passenger’s power seats
54 PWR
OUTLET15Power outlet (12 VDC)
55 IG1 NO.210Rear air conditioning system, in-
side rear view mirror
56 RR WSH15Rear window washer
57 ECUIG10
Shift lock control system, power
windows, outside rear view
mirror defogger, anti −lock brake
system, active traction control
system, vehicle skid control
system, air conditioning system,
navigation system, power
windows, moon roof, Lexus link
system, tilt and telescopic
steering, multi −information
display, driving position
memory system
58 IG110
Air conditioning system, back −up
lights, rear window defogger,
seat heaters, vehicle skid control
system

ELECTRICAL COMPONENTS
447
No.FUSEAMPERECIRCUIT
59 STA7.5Multiport fuel injection
system/sequential multiport fuel
injection system
60 P FR P/W20Front passenger’s power window
61 P RR P/W20Rear right side power window
62 D RR P/W20Rear left side power window
63 PANEL10Instrument panel lights
64 TAIL10Parking lights, tail lights, license
plate lights, front fog lights
65 ACC7.5
Shift lock control system, power
outlets, outside rear view
mirrors, car audio system,
navigation system, power rear
view mirrors, multi−information
display
66 CIG10Cigarette lighter
67 POWER
OR TI&TE30Power windows, moon roof, tilt
and telescopic steering
CHECKING BATTERY CONDITION
Precautions
CAUTION
BATTERY PRECAUTIONS
The battery produces flammable and explosive
hydrogen gas.
 Do not cause a spark by contacting the battery
terminals with tools.
 Do not smoke or light a match near the battery.
The electrolyte contains poisonous and corrosive
sulfuric acid.
 Avoid contact with eyes, skin or clothes.
 Never inhale or swallow electrolyte.
 Wear protective safety glasses when working near
the battery.
 Keep children away from the battery.
EMERGENCY MEASURES
 If electrolyte gets in your eyes, flush your eyes with
clean water for at least 15 minutes and get immediate
medical attention. If possible, continue to apply
water with a sponge or cloth while traveling to the
medical office.