2006 Lexus GS430 suspension

STARTING AND DRIVING
446
Adaptive variable suspension control (GS430
only)
When the precollision sensor detects an object or
vehicle with which your vehicle may collide, and
determines that a collision may be unavoidable, the
adaptive variable suspension adjusts the damping effect
on the shock absorbers and regulates the vehicle not to
pitch forward so much.
The adaptive variable suspension will operate in the following
conditions:
When the vehicle speed is about 5 km/h (3 mph) or over.
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
Precollision system failure warning
G31079
Precollision system warning light
The light warns that there is a problem somewhere in the
precollision system.
The light comes on when the engine switch is selected in
“IG−ON” mode. If the system works properly, the light goes off
after a few seconds.
If the light does not come on when the engine switch is selected
in “IG−ON” mode, have your vehicle checked by your Lexus
dealer.
If the system has a problem, the pre− collision system warning
light comes on or blinks. At this time, the master warning light
comes on, a warning tone sounds, and either of the following
messages appears on the multi−information display.
 PCS DISABLED NOW
 CHECK PCS

IN CASE OF AN EMERGENCY
469
NOTICE
Do not use liquid sealants for a flat tire as tire
pressure sensors will be damaged.
 Take due care not to go over a curb stone and
be careful of the holes in the road because
deflated tire pressure affects tire cushion
performance. The wheels, tires, body,
suspension and other components could be
damaged.
 Your ground clearance is reduced if the runflat
tire goes flat so avoid driving over obstacles
and drive slowly on rough, unpaved roads and
speed bumps. Also, do not attempt to go
through an automatic car wash as the vehicle
may get caught, resulting in damage.
 When the tires must be replaced, have them
replaced by the nearest Lexus dealer or
authorized tire dealer. The tire pressure
sensors will be affected by the installation or
removal of tires.
 When the tires must be replaced, replace the
grommets for tire pressure sensors as well.
IF YOU HAVE A FLAT TIRE
(Vehicles with standard tires)
CAUTION
If the low tire pressure warning light comes on,
observe the following instructions:
 Decelerate as soon as possible to the most
appropriate speed that conditions permit.
 Avoid abrupt steering wheel maneuvering and
braking. If the vehicle tires deteriorate, you
could lose control of the steering wheel or the
brakes, causing death or serious injury.
 The warning system may not activate
immediately if bursts or sudden air leakage
should occur.
1. Reduce your speed gradually, keeping a straight line.
Move cautiously off the road to a safe place − well away
from the traffic. Avoid stopping on the center divider of
a highway. Park on a level spot with firm ground.
2. Stop the engine and turn on your emergency flashers.
3. Firmly set the parking brake and put the transmission
in ”P”.
4. Have everyone get out of the vehicle on the side away
from traffic.

MAINTENANCE
496
DOES YOUR VEHICLE NEEDREPAIRING?
Be on the alert for changes in performance and sounds, and
visual tip −offs that indicate service is needed. Some important
clues are:
 Engine missing, stumbling, or pinging
 Appreciable loss of power
 Strange engine noises
 A fluid leak under the vehicle (however, water dripping from
the air conditioning after use is normal.)
 Change in exhaust sound (This may indicate a dangerous
carbon monoxide leak. Drive with the windows open and
have the exhaust system checked immediately.)
 Flat−looking tires, excessive tire squeal when cornering,
uneven tire wear
 Vehicle pulls to one side when driving straight on a level
road
 Strange noises related to suspension movement
 Loss of brake effectiveness, spongy feeling brake pedal,
pedal almost touches floors, vehicle pulls to one side when
braking
 Engine coolant temperature continually higher than normal
If you notice any of these clues, take your vehicle to your Lexus
dealer as soon as possible. It probably needs adjustment or
repair.
CAUTION
Do not continue driving with the vehicle unchecked. It
could result in serious vehicle damage and possibly
personal injury.

SECTION 6 – 3
531
SERVICE PROCEDURES AND
SPECIFICATIONS
Chassis
Specifications (GS430)532
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications (GS300) 535
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking brake fluid 538
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
.
Checking tire inflation pressure 539
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire information 542
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . .
Run−flat tires 552
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . .
Types of tires 553
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . .
Rotating tires 554
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . .
Checking and replacing tires 554
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing snow tires and chains 558
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing wheels 560
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . .
Aluminum wheel precautions 561
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension and chassis 562
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHASSIS
562
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.

ELECTRICAL COMPONENTS
566
No.FUSEAMPERECIRCUIT
1 STR LOCK25Steering lock system
2 SECURITY7.5Smart access system with
push−button start
3 TI &TE20Power tilt and telescopic
steering wheel, Multiplex
communication system
4 AM17.5Starting system
5 STOP SW7.5
Stop/tail lights, Multi− port fuel
injection system/sequential
multiport fuel injection system,
Starting system, Electronic
control brake system, Vehicle
stability control system, Shift
lock system
6 OBD7.5On− board diagnosis system
7 FR P/SEAT
RH30Power seat system
8 AIR SUS20Electronic modulated
suspension
9 PWR
OUTLET15Power outlet
10 CIG15Cigarette lighter
11 ACC7.5
Multiplex communication
system, Smart access system
with push− button start, Rear
view monitor system, Audio
system, Air conditioning system
No.FUSEAMPERECIRCUIT
12 IGN10
Multi− port fuel injection
system/sequential multiport fuel
injection system, SRS airbag
system, Stop/tail lights,
Steering lock system, Electronic
control brake system
13 GAUGE7.5Gauges and meters
14 ECUIG
RH10
Power tilt and telescopic
steering wheel, Multiplex
communication system, Smart
access system with
push −button start, Audio
system, Air conditioning
system, Shift lock system, Tire
pressure warning system,
Combination switch
15 FR S/HTR
RH15Seat heater, Heated and
ventilated seats
16 RHIG7.5
Seat heater switches, Front
right door control system, Rear
right door control system,
Capacitor, Combination switch,
Seat belt pretensioners,
Intuitive parking assist
17 AM215Starting system

ELECTRICAL COMPONENTS
567
No.FUSEAMPERECIRCUIT
18 FR DOORRH20
Front right door control system
(Power door lock system,
Power rear view mirror control
system, Door courtesy light,
Outside rear view mirror heater,
Power window), Multiplex
communication system
19 RR DOOR RH20Rear right door control system
(Power door lock system, Door
courtesy light, Power window)
20 RR DOOR LH20Rear left door control system
(Power door lock system, Door
courtesy light, Power window)
21 FR DOORLH20
Front left door control system
(Power door lock system,
Power rear view mirror control
system, Door courtesy light,
Outside rear view mirror heater,
Power window)
22 RAD NO.310Audio system
23 HLP LVL7.5Adaptive front lighting system
(AFS), Automatic headlight
leveling control system
No.FUSEAMPERECIRCUIT
24 LHIG10
Charging system, Headlight
cleaners, Exhaust gas sensor,
Rear window defogger, Electric
cooling fans, Rear left door
control system, Front left door
control system, Emergency
flashers, Automatic
transmission, Seat belt
pretensioners, Intuitive parking
assist
25 FR WIP30Windshield wipers and washer
26 PANEL7.5
Steering switch illumination,
Audio system, Glove box light,
Automatic transmission selector
lever illumination, Console box
light, Adaptive variable
suspension switch illumination,
Cigarette lighter illumination, Air
conditioning system, Traction
control off switch illumination,
Driving pattern selector switch,
Seat heater or Heated and
ventilated seat switches,
Register ILL RH, Register ILL
LH, Register ILL CTR
27 FUEL
OPEN10Fuel filler door opener, Trunk lid
opener