LEXUS GS400 2000 Service Repair Manual

F02562
Matchmarks
A
B
F02563
SR±12± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
2182 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. REMOVE UPPER AND LOWER COLUMN COVERS
Remove the 3 screws.
4. REMOVE COMBINATION SWITCH WITH SPIRAL
CABLE
(a) Disconnect the 4 connectors.
(b) Disconnect the airbag connector.
(c) Remove the 3 screws.
5. REMOVE SPIRAL CABLE (See page BE±34)
NOTICE:
Do not disassemble the cable or apply oil to it.
6. REMOVE NO.1 UNDER COVER
(a) Remove the 3 screws.
(b) Disconnect the OBD II.
(c) Disconnect the connectors.
7. REMOVE FINISH PLATE AND END PAD
8. REMOVE NO.1 SAFETY PAD
(a) Remove the 2 screws and disconnect the hood lock re-
lease lever from the panel.
(b) Remove 4 pad set bolts and screw.
9. REMOVE HEATER TO REGISTER DUCT NO.7
10. DISCONNECT INTERMEDIATE SHAFT ASSEMBLY
(a) Place matchmarks on the intermediate shaft and control
valve shaft.
(b) Loosen the bolt A and remove the bolt B.
11. REMOVE STEERING COLUMN ASSEMBLY
(a) Disconnect the connectors.
(b) Remove the brake pedal return spring.
(c) Loosen the hole cover clamp.
(d) Remove the 4 column assembly set nuts.
12. REMOVE INTERMEDIATE SHAFT ASSEMBLY
Remove the bolt A.
13. REMOVE DUST COVER

SR0X0±01
F01848Matchmarks
F01849Screw Extractor
F09385
± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNSR±13
2183 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. REMOVE TRANSPONDER KEY COIL
Remove the screw and transponder key coil.
2. REMOVE KEY CYLINDER LAMP ILLUMINATION
3. REMOVE NO.2 INTERMEDIATE SHAFT ASSEMBLY
(a) Place matchmarks on the No.2 shaft and main shaft.
(b) Remove the bolt and No.2 intermediate shaft assembly.
4. REMOVE COLUMN UPPER BRACKET
(a) Using a centering punch, mark the center of the 2 ta-
pered±head bolts.
(b) Using a 4±5 mm (0.16±0.20 in.) drill, drill into the 2 bolts.
(c) Using a screw extractor, remove the 2 bolts and column
upper bracket.
5. REMOVE COLUMN TUBE SUPPORT
(a) Remove the bolt and column tube support.
(b) Remove the tube support with tube attachment.
(c) Remove the tube attachment from the tube support.
6. REMOVE TURN SIGNAL BRACKET
Remove the 3 bolts and turn signal bracket.
7. REMOVE STEERING COLUMN PROTECTOR
Remove the 2 bolts and steering column protector.
8. REMOVE TILT SLIDER ASSEMBLY
(a) Using a hexagon wrench, remove the 4 bolts, 2 washers
and tilt slider assembly.
(b) Remove the 4 bushings, 2 plates from tilt slider assembly.
9. REMOVE NO.1 BRACKET
Remove the bolt and No.1 bracket.
10. REMOVE NO.2 BRACKET
Remove the bolt and No.2 bracket.
11. REMOVE TILT AND TELESCOPIC ECU
Remove the 2 bolts and tilt and telescopic ECU.

SR0DN±01
F01850
F01851
SR±14± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
2184 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT STEERING LOCK OPERATION
Check that the steering lock mechanism operates properly.
2. IF NECESSARY, REPLACE KEY CYLINDER
(a) Place the ignition key at the ACC position.
(b) Push down the stop pin with a screwdriver, and pull out
the cylinder.
(c) Install a new cylinder.
HINT:
Make sure the key is at the ACC position.
3. INSPECT IGNITION SWITCH
(See page BE±31)
4. IF NECESSARY, REPLACE IGNITION SWITCH
(a) remove the 2 screws.
(b) Install a new switch with the 2 screws.
5. INSPECT KEY UNLOCK WARNING SWITCH
(See page BE±31)
6. INSPECT KEY INTERLOCK SOLENOID
(See page AT±12)
7. IF NECESSARY, REPLACE KEY UNLOCK WARNING
SWITCH WITH KEY INTERLOCK SOLENOID
(a) Remove the 2 screws.
(b) Install a new switch with solenoid with the 2 screws.
8. INSPECT TRANSPONDER KEY COIL
(See page BE±248)
9. IF NECESSARY, REPLACE TRANSPONDER KEY
COIL
10. IF NECESSARY, REPLACE TRANSPONDER KEY AM-
PLIFIER
(a) remove the screw.
(b) Install a new key amplifier with the bolt.

SR0X1±01
F09385
± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNSR±15
2185 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. INSTALL TILT AND TELESCOPIC ECU
Install the tilt and telescopic ECU with the 2 screws.
2. INSTALL NO.2 BRACKET
Install the No.2 bracket with the bolt.
3. INSTALL NO.1 BRACKET
Install the No.1 bracket with the bolt.
4. INSTALL TILT SLIDER ASSEMBLY
(a) Install 2 new plates and 4 new bushings to the tilt slider
assembly in the direction shown in the illustration.
HINT:
Install the bushings with their cuts facing downward.
(b) Using a hexagon wrench, install the tilt slider assembly
with the 2 washers and 4 bolts.
Torque: 23 N´m (230 kgf´cm, 17 ft´lbf)
HINT:

When replacing a tilt slider assembly with new one, apply
grease on the removed tilt slider assembly to the shaft of
the new tilt slider assembly.

Install the tilt slider assembly with the bolt portion of the
tilt slider faced downward.

Do not let the grease be stuck on the thread part of the bolt
in order to prevent the bolt from slipping.
5. INSTALL STEERING COLUMN PROTECTOR
Install the steering column protector.
6. INSTALL TURN SIGNAL BRACKET
Install the turn signal bracket with the 3 bolts.
7. INSTALL COLUMN TUBE SUPPORT
NOTICE:
If the attachment or support is deformed, replace it with a
new one.
(a) Install the tube attachment to the tube support.
(b) Install the column tube support with the bolt.
Torque: 20 N´m (204 kgf´cm, 15 ft´lbf)
NOTICE:
Make sure to install the support facing the correct direction
(See page SR±9).

Tighten the bolt while holding the support to prevent
it turning too.

Be sure to tighten the bolt with the specified torque.

F01852
F01848Matchmarks
SR±16± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
2186 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
8. INSTALL COLUMN UPPER BRACKET
(a) Install the column upper bracket with 2 new tapered±
head bolts.
(b) Tighter the 2 tapered±head bolts until the bolt heads
break off.
9. INSTALL NO.2 INTERMEDIATE SHAFT ASSEMBLY
(a) Align the matchmarks on the No.2 shaft and main shaft.
(b) Install the bolt.
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
10. INSTALL KEY CYLINDER ILLUMINATION
11. INSTALL TRANSPONDER KEY COIL
Install the transponder key coil with the screw.

SR0DP±01
F02563
F02562
A
B
Matchmarks
± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNSR±17
2187 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL DUST COVER
2. INSTALL INTERMEDIATE SHAFT ASSEMBLY
Temporarily tighten the bolt A.
3. INSTALL STEERING COLUMN ASSEMBLY
(a) Torque the 4 column assembly set nuts.
Torque: 25 N´m (260 kgf´cm, 19 ft´lbf)
(b) Tighten the hole cover clamp.
(c) Install the brake pedal return spring.
(d) Connect the connectors.
4. CONNECT INTERMEDIATE SHAFT ASSEMBLY
(a) Align the matchmarks on the intermediate shaft and con-
trol valve shaft.
(b) Torque the bolt B.
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
(c) Torque the bolt A.
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
5. INSTALL HEATER TO REGISTER DUCT NO.7
6. INSTALL NO.1 SAFETY PAD
(a) Install the 4 pad set bolts and screw.
(b) Install the 2 screws and connect the hood lock release le-
ver to the panel.
7. INSTALL FINISH PLATE AND END PAD
8. INSTALL NO.1 UNDER COVER
(a) Connect the connectors.
(b) Connect the OBD II.
(c) Tighten the 3 screws.
9. INSTALL SPIRAL CABLE
(See page BE±34)
10. INSTALL COMBINATION SWITCH WITH SPIRAL
CABLE
(a) Tighten the 3 screws.
(b) Connect the airbag connector.
(c) Connect the 4 connectors.
11. INSTALL UPPER AND LOWER COLUMN COVERS
Tighten the 3 screws.

F02564Mark
F03676
Torx ScrewScrew Case
SR±18± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
2188 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
12. CENTER SPIRAL CABLE
(a) Check that the front wheels are facing straight ahead.
(b) Turn the cable counterclockwise by hand until it becomes
harder to turn the cable.
(c) Then rotate the cable clockwise about 3 turns to align the
mark.
HINT:
The cable will rotate about 3 turns to either left or right of the
center.
13. INSTALL STEERING WHEEL
(a) Align the matchmarks on the wheel and main shaft.
(b) Torque the wheel set nut.
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
(c) Connect the connector.
14. INSTALL STEERING WHEEL PAD
NOTICE:

Make sure the wheel pad is installed to the specified
torque.

If the wheel pad has been dropped, or there are
cracks, dents or other defects in the case or connec-
tor, replace the wheel pad with a new one.

When installing the wheel pad, take care that the wir-
ings do not interfere with other parts and are not
pinched between other parts.
(a) Connect the airbag connector.
(b) Install the pad after confirming that the circumference
groove of the torx screw is caught on the screw case.
(c) Using a torx socket wrench, torque the 2 screws.
Torque: 8.8 N´m (90 kgf´cm, 78 in.´lbf)
(d) Install the steering wheel lower No.2 and No.3 covers.
15. CHECK STEERING WHEEL CENTER POINT

F02555
Engine Under Cover
x16 Drive BeltPS Vane pump
AssemblyClip
Return Hose
Pressure Feed Tube
Union Bolt

Gasket
58 (590, 43)
49 (500, 36)
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
SR0DQ±01
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
SR±19
2189 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER STEERING VANE PUMP (2JZ±GE)
COMPONENTS

F02549
Vane Pump Pulley
Vane Pump Shaft
Front HousingSpringFlow Control
Valve
Rear Housing Ware Washer
Cam Ring
x10
Vane Pump RotorVane PlateSide Plate
Gasket

Bearing

Snap Ring
Snap Ring
Oil Seal
O±Ring



O±Ring

Straight PinSolenoid Valve Oil Reservoir

O±Ring
13 (130, 9)
24 (240, 17)
43 (440, 32)
69 (700, 51)
*51 (524, 38)
24 (240, 17)
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
Power steering fluid
* For use with SST SR±20
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
2190 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

SR0DF±03
SR±2
± STEERINGTROUBLESHOOTING
2172 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in the order shown. If necessary, repair or replace these parts.
SymptomSuspect AreaSee page
Hard steering
3. Tires (Improperly inflated)
4. Power steering fluid level (Low)
5. Drive belt (Loose)
6. Front wheel alignment (Incorrect)
7. Steering system joints (Worn)
8. Suspension arm ball joints (Worn)
9. Steering column (Binding)
10.Power steering gear
11. PPS systemSA±2
SR±4
±
SA±4
±
SA±27
SA±37
±
SR±42
SR±59
Poor return
1. Tires (Improperly inflated)
2. Front wheel alignment (Incorrect)
3. Steering column (Binding)
4. Power steering gearSA±2
SA±4
±
SR±42
Excessive play
1. Steering system joints (Worn)
2. Suspension arm ball joints (Worn)
3. Intermediate shaft, Universal joint, Sliding yoke (Worn)
4. Front wheel bearing (Worn)
5. Power steering gear
6. PPS system±
SA±27
SA±37
±
SA±10
SR±42
SR±59
Abnormal noise
1. Power steering fluid level (Low)
2. Steering system joints (Worn)
3. Power steering gearSR±4
±
SR±42
HINT:
When the problem occurs on the power tilt and telescopic steering system, refer to the DI section.
(See page DI±517)