wheel LEXUS GS400 2000 Service User Guide

± BRAKEHYDRAULIC BRAKE BOOSTER
BR±41
2149 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(2) Turn the ºSA3º and ºSTRº ON simultaneously with
the LEXUS hand±held tester, and check that the
rear wheels by does not rotate by hand.
HINT:
When rotating the wheel fast, the fail±safe function is activated
and judgement cannot be made properly. So rotate the wheel
as slowly as possible.
If the rear wheels rotate, replace the hydraulic brake booster.
(3) Turn the ºSA3º and ºSTRº OFF simultaneously, and
check that the rear wheels by rotating them by
hand.
HINT:

To protect the solenoids, LEXUS hand±held tester turns
OFF automatically 2 sec. after every solenoid has been
turned ON.

When rotating the wheel fast, the fail±safe function is acti-
vated and judgement cannot be made properly. So rotate
the wheel as slowly as possible.
NOTICE:
When operating it continuously, set the interval of more
than 20 secs.
If the rear wheels stop, replace the hydraulic brake booster.
(l) Inspect the right rear ABS solenoid.
(1) Select the ºSA3º, ºSTRº and ºSRRHº, on the LEXUS
hand±held tester.
(2) Turn the ºSA3º, ºSTRº and ºSRRHº ON simulta-
neously with the LEXUS hand±held tester, and
check that the right rear wheel by rotating it by hand.
HINT:

To protect the solenoids, LEXUS hand±held tester turns
OFF automatically 2 sec. after every solenoid has been
turned ON.

When rotating the wheel fast, the fail±safe function is acti-
vated and judgement cannot be made properly. So rotate
the wheel as slowly as possible.

When solenoid is OFF, the wheel might stop temporarily.
However if the wheel rotates again, the function works
normally.
If the rear wheels stop, replace the hydraulic brake booster.
(3) Turn the ºSA3º, ºSTRº and ºSRRHº OFF, and check
that the right rear wheel by rotating it by hand.
HINT:

To protect the solenoids, LEXUS hand±held tester turns
OFF automatically 2 sec. after every solenoid has been
turned ON.

When rotating the wheel fast, the fail±safe function is acti-
vated and judgement cannot be made properly. So rotate
the wheel as slowly as possible.
If the right rear wheel stop, replace the hydraulic brake booster.

BR±42
± BRAKEHYDRAULIC BRAKE BOOSTER
2150 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(4) Depress the pedal with stable force, then turn the
ºSRRHº and ºSRRRº ON simultaneously.
(5) When the solenoids are ON, check that the right
rear wheel by rotating it by hand.
(m) Inspect the left rear ABS solenoid operation.
(1) Select the ºSA3º, ºSTRº and ºSRLHº on the LEXUS
hand±held tester.
(2) Turn the ºSA3º, ºSTRº and ºSRLHº ON with LEXUS
hand±held tester, and check that the left rear wheel
by rotating it by hand.
HINT:
When rotating the wheel fast, the fail±safe function is activated
and judgement cannot be made properly. So rotate the wheel
as slowly as possible.
If the rear wheels stop, replace the hydraulic brake booster.
(3) Turn the ºSA3º, ºSTRº and ºSRLHº OFF and check
that the left rear wheel by rotating it by hand.
HINT:

To protect the solenoids, LEXUS hand±held tester turns
OFF automatically 2 sec. after every solenoid has been
turned ON.

When rotating the wheel fast, the fail±safe function is acti-
vated and judgement cannot be made properly. So rotate
the wheel as slowly as possible.

When solenoid is OFF, the wheel might stop temporarily.
However if the wheel rotates again, the function works
normally.
If the left rear wheel stop, replace the hydraulic brake booster.
(4) Depress the pedal with stable force, then turn the
ºSRLHº and ºSRLRº ON simultaneously.
HINT:
To protect the solenoids, LEXUS hand±held tester turns OFF
automatically 2 sec. after every solenoid has been turned ON.
(5) When the solenoids are ON, check that the left rear
wheel by rotating it by hand.
HINT:
When rotating the wheel fast, the fail±safe function is activated
and judgement cannot be made properly. So rotate the wheel
as slowly as possible.
(n) Lower the vehicle.
(o) Disconnect the LEXUS hand±held tester.

F02830
F02831
BR±46
± BRAKEHYDRAULIC BRAKE BOOSTER
2154 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(p) Inspect the rear TRAC & VSC solenoid.
(1) Release the parking brake pedal and shift the shift
lever to ºLº position.
(2) Push and hold the ºSA3º switch and ºSTRº switch
simultaneously.
NOTICE:

Do not keep the ºSTRº switch pushed down for more
than 10 seconds.

Do not keep the ºSA3º switch pushed down for more
than 5 seconds.

When operating it continuously, set the interval of
more than 20 seconds.
(3) Check that the rear wheels stop.
If the rear wheels rotate, replace the hydraulic brake booster.
(4) Release the ºSA3º switch and ºSTRº switch simulta-
neously.
(5) Check that the rear wheels rotate.
If the rear wheels stop, replace the hydraulic brake booster.
(q) Inspect the right rear ABS solenoid.
(1) Turn the selector switch to ºRHº position.
(2) Depress the brake pedal several times and release
the brake pedal when the pump begins rotating.
Wait until the pump stops.
(3) Turn the ignition switch OFF.
(4) Depress the brake pedal with a force of 343 N (35
kgf, 77 lbf), record the fluid surface in the reservoir
tank of the hydraulic brake booster.
(5) Press the MAIN push switch for 10 sec., and check
that the fluid surface in the reservoir tank of the hy-
draulic brake booster does not rise up at this time.
If the fluid surface level rises up, replace the hydraulic brake
booster.
NOTICE:
Do not press MAIN push switch for more than 10 sec. When
operating the switch continuously, do it an interval of more
than 20 seconds.
(6) Start the engine and run it at idle.
(7) Depress the brake pedal.
(8) Release the parking brake pedal and shift the shift
lever to ºLº position.
(9) Once, release the brake pedal. After depressing the
brake pedal with stable force, then push and hold
MAIN push switch.
(10) Check that the right rear wheel rotates.
If the right rear wheel stops, replace the hydraulic brake boost-
er.

F02832
± BRAKEHYDRAULIC BRAKE BOOSTER
BR±47
2155 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(r) Inspect the left rear ABS solenoid.
(1) Turn the selector switch to ºLHº position.
(2) Depress the brake pedal several times and release
the brake pedal when the pump begins rotating.
Wait until the pump stops.
(3) Turn the ignition switch OFF.
(4) Depress the brake pedal with a force of 343 N (35
kgf, 77 lbf), record the fluid surface in the reservoir
tank of the hydraulic brake booster.
(5) Press the MAIN push switch for 10 sec., and check
that the fluid surface in the reservoir tank of the hy-
draulic brake booster does not rise up at this time.
If the fluid surface level rises up, replace the hydraulic brake
booster.
NOTICE:
Do not press MAIN push switch for more than 10 sec. When
operating the switch continuously, do it an interval of more
than 20 seconds.
(6) Start the engine and run it at idle.
(7) Depress the brake pedal.
(8) Release the parking brake pedal and shift the shift
lever to ºLº position.
(9) Once, release the brake pedal. After depressing the
brake pedal with stable force, then push and hold
MAIN push switch.
(10) Check that the left rear wheel rotates.
If the left rear wheel stops, replace the hydraulic brake booster.
(s) Stop the engine and lower the vehicle.
(t) Remove the ºSHEET Gº (SST) and disconnect the actua-
tor checker (SST) and sub±wire harness S (SST) from the
hydraulic brake booster.
(u) Connect the 2 connectors to the actuator.
(v) Clear the DTC (See page DI±389).

F02821
Hydraulic Brake
BoosterSub±Wire harness S (SST)
AIR BLEED
FRONT
REARActuator Checker (SST) BR±6
± BRAKEBRAKE FLUID
2114 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Connect the actuator checker (SST) to the hydraulic
brake booster side wire harness via the sub±wire harness
S (SST), as shown in the chart below.
SST 09990±00150, 09990±00480
HINT:
Connect the connector with the label of ºAIR BLEEDº attached
to the connector of actuator checker.
(c) Connect the red cable of the actuator checker to the bat-
tery positive (+) terminal and the black cable to the nega-
tive (±) terminal.
(d) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(e) Turn the ignition switch ON, check that the pump stops af-
ter approx. 30 to 40 seconds.
NOTICE:
When the pump does not stop, repeat step (d) and (e) again.
(f) With the ignition switch remained ON, depress the brake
pedal more than 20 times.
(g) Observe the procedure in step 4 and bleed the right and
left front wheel caliper.
(h) Holding the brake pedal depressed, bleed the right and
left rear wheel caliper.
HINT:
It is not necessary to depress the pedal continuously, as brake
fluid flows out by first depressing.

F02851
BR±8
± BRAKEBRAKE FLUID
2116 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(l) Observe the procedure in step (k) and bleed left rear
brake line.
(m) Disconnect the actuator checker (SST) and sub±wire har-
ness (SST) from the actuator.
SST 09990±00150, 09990±00480
(n) Connect the 2 connectors to the hydraulic brake booster.
(o) Clear the DTC (See page DI±389).
4. BLEED BRAKE LINE
(a) Connect the vinyl tube to the brake caliper.
(b) Depress the brake pedal several times, then loosen the
bleeder plug with the pedal held down.
(c) At the point when fluid stops coming out, tighten the
bleeder plug, then release the brake pedal.
(d) Repeat (b) and (c) until all the air in the fluid has been bled
out.
(e) Repeat the above procedure to bleed the brake line for
each wheel.
Torque: 11 N´m (110 kgf´cm, 8 ft´lbf)
5. CHECK FLUID LEVEL IN RESERVOIR
(a) With the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes heavy and stroke becomes shorter.
(b) Remove the reservoir cap. Add brake fluid up to the
ºMAXº line.
Fluid: SAE J1703 or FMVSS NO. 116 DOT3

BR0K9±04
F06046
SST
F01655
SST
F06047
BR±50
± BRAKEHYDRAULIC BRAKE BOOSTER
2158 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:

Before starting the work, make sure that the ignition
switch is OFF and depress the brake pedal more than
40 times.

As high pressure is applied to the brake actuator tube
No. 1, never deform it.

Until the work is over, do not turn the ignition switch
ON.
1. DRAW OUT FLUID WITH SYRINGE
NOTICE:
Do not let brake fluid remain on a painted surface. Wash it
off immediately.
2. REMOVE NO. 1 UNDER COVER (See page BO±88)
3. REMOVE END PAD AND NO. 1 SAFETY PAD
4. REMOVE NO. 7 HEATER TO REGISTER DUCT
5. DISCONNECT BRAKE LINES
Using SST, disconnect the 4 brake lines.
SST 09023±00100
Torque: 15 N´m (155 kgf´cm, 11 ft´lbf)
6. DISCONNECT LEFT FRONT WHEEL BRAKE LINE
Using SST, disconnect the left front wheel brake line from the
flexible hose.
SST 09023±00100
Torque: 15 N´m (155 kgf´cm, 11 ft´lbf)
7. REMOVE 2 BRAKE LINE CLAMPS
8. DISCONNECT LEVEL WARNING SWITCH CONNEC-
TOR
9. DISCONNECT 4 CONNECTORS
10. REMOVE PEDAL RETURN SPRING, CLIP AND CLE-
VIS PIN
11. REMOVE HYDRAULIC BRAKE BOOSTER ASSEMBLY
(a) Loosen the lock nut, then remove the clevis and lock nut.
Torque: 25 N´m (260 kgf´cm, 19 ft´lbf)
(b) Remove the 4 booster installation nuts.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
(c) Remove the booster assembly and gasket.

BR0K2±06
F02814
F02815
BR±58
± BRAKEFRONT SPEED SENSOR
2166 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE FRONT WHEEL
Torque: 103 N´m (1,050 kgf´cm, 76 ft´lbf)
2. DISCONNECT SPEED SENSOR CONNECTOR
3. REMOVE SPEED SENSOR
(a) Remove the resin clip and 2 clamp bolts holding the sen-
sor harness to the body.
Torque: 5.0 N´m (51 kgf´cm, 44 in.´lbf)
(b) Remove the bolt and speed sensor from the steering
knuckle.
Torque: 8.0 N´m (82 kgf´cm, 71 in.´lbf)

A02823
A01483
A02794
A02791
A02789
Matchmark
Wire Clamp
EM±64
± ENGINE MECHANICAL (2JZ±GE)ENGINE UNIT
1418 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
14. DISCONNECT PS PUMP AND A/C COMPRESSOR
WITHOUT DISCONNECTING HOSES
(a) Disconnect the PS air hose from the No.4 timing belt cov-
er.
(b) Disconnect the PS air hose from the air intake chamber.
(c) Remove the 2 bolts and pump rear stay.
(d) Remove the 3 bolts and plate washer, and disconnect the
vane pump assembly from the engine.
(e) Loosen the nut.
(f) Using a torx socket (E10), remove the stud bolt and nut.
(g) Disconnect the PPS solenoid valve connector.
(h) Disconnect the A/C compressor connector.
(i) Remove the 2 bolts, and disconnect the compressor from
the engine.
HINT:
Put aside the vane pump and compressor, and suspend it se-
curely.
15. REMOVE PROPELLER SHAFT (See page PR±4)
16. REMOVE TRANSMISSION CONTROL ROD
Remove the 2 nuts and control rod.
17. DISCONNECT PS GEAR HOUSING
(a) Check the steering wheel at the straight±ahead position,
and place matchmarks on the sliding yoke and intermedi-
ate shaft.
(b) Remove the bolt holding the sliding yoke to the steering
intermediate shaft.
(c) Disconnect the PS pressure switch connector and wire
clamp.

R11910Match Marks
± INTRODUCTIONFOR ALL OF VEHICLES
IN±11
11 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
reset the memory. To avoid erasing the memory of
each memory system, never use a back±up power
supply from another battery.
(3) Even in cases of a minor collision where the SRS
does not deploy, the steering wheel pad, front pas-
senger airbag assembly, side airbag assembly,
front airbag sensor, side airbag sensor and seat belt
pretensioner should be inspected
(See page RS±15, RS±29, RS±42, RS±60, RS±65
and BO±125).
(4) Never use SRS parts from another vehicle. When
replacing parts, replace them with new parts.
(5) Before repairs, remove the airbag sensor if shocks
are likely to be applied to the sensor during repairs.
(6) Never disassemble and repair the airbag sensor as-
sembly, side airbag sensor assembly, steering
wheel pad, front passenger airbag assembly, side
airbag assembly, front airbag sensor, side airbag
sensor or seat belt pretensioner.
(7) If the airbag sensor assembly, side airbag sensor
assembly, steering wheel pad, front passenger air-
bag assembly, side airbag assembly, front airbag
sensor, side airbag sensor or seat belt pretensioner
has been dropped, or if there are cracks, dents or
other defects in the case, bracket or connector, re-
place them with new ones.
(8) Do not directly expose the airbag sensor assembly,
side airbag sensor assembly, steering wheel pad,
front passenger airbag assembly, side airbag as-
sembly, front airbag sensor, side airbag sensor or
seat belt pretensioner to hot air or flames.
(9) Use a volt/ohmmeter with high impedance (10 kW/V
minimum) for troubleshooting of the electrical cir-
cuit.
(10) Information labels are attached to the periphery of
the SRS components. Follow the instructions on the
notices.
(11) After work on the supplemental restraint system is
completed, check the SRS warning light (See page
DI±552).
(c) SPIRAL CABLE (in Combination Switch)
The steering wheel must be fitted correctly to the steering
column with the spiral cable at the neutral position, other-
wise cable disconnection and other troubles may result.
Refer to SR±17 of this manual concerning correct steer-
ing wheel installation.