ignition LEXUS GS400 2000 Service Repair Manual

B01982
LEXUS
Hand±Held
TesterSF0N2±05
B09511
Up
Screw
Pulsation Damper
B01958
Fuel Inlet Hose
A02818
SST
SST
(Union)
SST
(Adapter)
SF±6
± SFI (2JZ±GE)FUEL PUMP
1472 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FUEL PUMP
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Connect a LEXUS hand±held tester to the DLC3.
(b) Turn the ignition switch ON and LEXUS hand±held tester
main switch ON.
NOTICE:
Do not start the engine.
(c) Select the ACTIVE TEST mode on the LEXUS hand±held
tester.
(d) Please refer to the LEXUS hand±held tester operator's
manual for further details.
(e) If you have no LEXUS hand±held tester, connect the pos-
itive (+) and negative (±) leads from the battery to the fuel
pump connector. (See step 3)
(f) Check that the pulsation damper screw rises up when the
fuel pump operates.
If there is no pressure, check the fusible link, fuses, EFI main
relay, fuel pump ECU, fuel pump, ECM and wiring connections.
(g) Turn the ignition switch OFF.
(h) Disconnect the LEXUS hand±held tester from the DLC3.
2. CHECK FUEL PRESSURE
(a) Check the battery positive voltage is above 12 V.
(b) Disconnect the negative (±) terminal cable from the bat-
tery.
(c) Remove the union bolt and 2 gaskets, and disconnect the
fuel inlet hose from the fuel pipe support.
NOTICE:

Put a shop towel under the fuel pipe support.

Slowly loosen the union bolt.
(d) Install the fuel inlet hose and SST (pressure gauge) to the
fuel pipe support with the 3 gaskets and SST (union and
adapter).
SST 09268±45014 (09268±41190, 90405±06167)
Torque: 29 N´m (300 kgf´cm, 21 ft´lbf)
(e) Wipe off any splattered gasoline.

SF0O8±01
B07574
Voltmeter
Disconnect
E2VC
B07575
Disconnect
Pressure
Vacuum
PTNK
ECM
E2Voltmeter
± SFI (2JZ±GE)VAPOR PRESSURE SENSOR
SF±61
1527 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF VAPOR
PRESSURE SENSOR
(a) Disconnect the vapor pressure sensor connector.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, measure the voltage between connec-
tor terminals VC and E2 of the wiring harness side.
Voltage: 4.5 ± 5.5 V
(d) Turn the ignition switch OFF.
(e) Reconnect the vapor pressure sensor connector.
2. INSPECT POWER OUTPUT OF VAPOR PRESSURE
SENSOR
(a) Turn the ignition switch ON.
(b) Disconnect the vacuum hose from the vapor pressure
sensor.
(c) Connect a voltmeter to terminals PTNK and E2 of the
ECM, and measure the output voltage under these condi-
tions:
(1) Apply vacuum (2.0 kPa (15 mmHg, 0.59 in.Hg)) to
the vapor pressure sensor.
Voltage: 1.3 ± 2.1 V
(2) Release the vacuum from the vapor pressure sen-
sor.
Voltage: 3.0 ± 3.6 V
(3) Apply pressure (1.5 kPa (15 gf/cm
2, 0.22 psi)) to the
vapor pressure sensor.
Voltage: 4.2 ± 4.8 V
(d) Turn the ignition switch OFF.
(e) Reconnect the vacuum hose to the vapor pressure sen-
sor.

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.

F09281
No.2 Intermediate Shaft
Assembly
Tilt and Telescopic ECUNo.2 BracketSteering Column
Protector
No.1 Bracket Column Tube SupportIgnition Switch
Tapered±Head Bolt
Tilt Steering Gear
Assembly with MotorTurn Signal
Bracket Key Interlock
SolenoidKey Unlock Warning
Switch
Key Cylinder
Illumination
Key Cylinder
35 (360, 26)
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
20 (204, 15)
Tube Attachment
Column Upper
BracketTransponder Key coil
Transponder Key
Amplifier

Plate
Tilt Slider
Assembly23 (230, 17)



Bushing

23 (230, 17)

Plate

Bushing
Washer
Washer
SR±10± STEERINGPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
2180 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

RS01Y±06
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±1
2232 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
SRS AIRBAG
PRECAUTION
NOTICE:

The LEXUS GS 400/300 is equipped with SRS, which comprises a driver airbag, front passenger
airbag and side airbag. Failure to carry out service operations in the correct sequence could
cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident.
Further, if a mistake is made in servicing the SRS, it is possible that the SRS may fail to operate
when required. Before performing servicing (including removal or installation of parts, inspec-
tion or replacement), be sure to read the following items carefully, then follow the correct proce-
dures described in the repair manual.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most impor-
tant source of information when troubleshooting. When troubleshooting the SRS, always in-
spect the DTCs before disconnecting the battery.

Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front
passenger airbag assembly, side airbag assembly, airbag sensor assembly, front airbag sen-
sor and side airbag sensor assembly should be inspected (See page RS±15, RS±29, RS±42
, RS±60 and RS±65).

Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Never disassemble and repair the steering wheel pad, front passenger airbag assembly, side
airbag assembly, airbag sensor assembly, front airbag sensor or side airbag sensor assembly
in order to reuse it.

If the steering wheel pad, front passenger airbag assembly, side airbag assembly, airbag sen-
sor assembly, front airbag sensor or side airbag sensor assembly has been dropped, or if there
are cracks, dents or other defects in the case, bracket or connector, replace them with new
ones.

Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's
electrical circuits.

Information labels are attached to the periphery of the SRS components. Follow the instruc-
tions on the notices.

After work on the SRS is completed, perform the SRS warning light check or SRS side airbag
warning light check (See page DI±552).

If the vehicle is equipped with a mobile communication system, refer to the precaution in the
IN section.
CAUTION:

Work must be started after 90 seconds from when the ignition switch is turned to the ºLOCKº
position and the negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds
from disconnecting the negative (±) terminal cable of the battery, the SRS may be deployed.)

When the negative (±) terminal cable is disconnected from the battery, the memory of the clock
and audio system will be canceled. So before starting work, make a record of the contents mem-
orized in the audio memory system. When work is finished, reset the audio systems as they
were before and adjust the clock. To avoid erasing the memory in each memory system, never
use a back± up power supply from outside the vehicle.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during
repairs.

Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly,
airbag sensor assembly, front airbag sensor or side airbag sensor assembly directly to hot air
or flames.

H02575
H02574
H02700
H02576
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±3
2234 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly. In normal
operation conditions when the ignition switch is turned to the
ACC or ON position, the light goes on for apporx. 6 seconds and
then goes off.
7. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit, ignition
control and drive circuit, etc. It receives signals from the airbag
sensor and judges whether the SRS must be activated or not.
8. FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the front
members. The sensor unit is a mechanical type. When the sen-
sor detects deceleration force above a predetermined limit,
contact is made in the sensor, sending a signal to the airbag
sensor assembly. The sensor cannot be disassembled.
9. SIDE AIRBAG SENSOR ASSEMBLY
The side airbag sensor assembly is mounted in the LH and RH
center pillar. The side airbag sensor assembly consists of a side
airbag sensor, safing sensor, diagnosis circuit, ignition control
and drive circuit, etc. It receives signals from the side airbag
sensors and judges whether the SRS side airbag must be acti-
vated or not.

AB0089
Secondary Lock
Primary LockLockLock
Primary Lock Incomplete
(Secondary Lock Prevented)Primary Lock Complete
(Secondary Lock Permitted)Twin±Lock Completed
Z14034
Fig.1
Fig.2Power Source
Safing
Sensor
Squibs
Airbag Sensor
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±7
2238 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(4) Connector Twin±Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by 2 locking devices to in-
crease the connection reliability. If the primary lock
is incomplete, ribs interfere and prevent the sec-
ondary lock.
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the pre-
determined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller decelera-
tion rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the airbag sensor go
on simultaneously. When a deceleration force acts on the
sensors, 2 squibs in the driver airbag and front passenger
airbag ignite and generate gas. The gas discharging into
the driver airbag and front passenger airbag rapidly in-
creases the pressure inside the bags, breaking open the
steering wheel pad and instrument panel door.
Bag inflation then ends, and the bags deflate as the gas
is discharged through discharge holes at the bag's rear or
side.

RS07E±01
H02589
H02590
H02591
RS±28
± SUPPLEMENTAL RESTRAINT SYSTEMFRONT PASSENGER AIRBAG ASSEMBLY
2259 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:

If the wiring connector of the SRS is disconnected
and the ignition switch is in ON or ACC position, DTCs
will be recorded.

Never use airbag parts from another vehicle. When
replacing parts, replace with new parts.
1. DISCONNECT AIRBAG CONNECTOR
(a) Using a screwdriver, remove the glove compartment door
finish plate.
HINT:
Tape the screwdriver tip before use.
(b) Remove the airbag connector from the plate.
(c) Disconnect the airbag connector.
2. REMOVE INSTRUMENT PANEL
(See page BO±91)
3. REMOVE FRONT PASSENGER AIRBAG ASSEMBLY
(a) Remove the 2 bolts and 2 straps.
(b) Remove the 2 nuts and front passenger airbag assembly.
CAUTION:

Do not store the front passenger airbag assembly
with the airbag deployment side facing down.

Never disassemble the front passenger airbag as-
sembly.

RS0JC±01
N20339
H03709
RS±40
± SUPPLEMENTAL RESTRAINT SYSTEMSIDE AIRBAG ASSEMBLY
2271 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:

If the wiring connector of the SRS is disconnected
and the ignition switch is in ON or ACC position, DTCs
will be recorded.

Never use the airbag parts from another vehicle.
When replacing parts, replace them with new parts.
1. REMOVE FRONT SEAT OUTER BELT FLOOR AN-
CHOR
(a) Using a screwdriver, remove the seat belt anchor cover
cap.
HINT:
Tape the screwdriver tip before use.
(b) Remove the front seat outer belt floor anchor.
2. REMOVE FRONT SEAT
(a) Using a screwdriver, remove the 4 seat track covers.
HINT:
Tape the screwdriver tip before use.
(b) Remove the 4 bolts, then disconnect the airbag connec-
tor.
NOTICE:
When handling the airbag connector, take care not to dam-
age the airbag wire harness.
(c) Remove the front seat.
3. REMOVE HEADREST
4. REMOVE POWER SEAT SWITCH KNOBS
5. REMOVE FRONT SEAT CUSHION SHIELD
6. REMOVE FRONT SEAT INNER CUSHION COVER
7. REMOVE SIDE AIRBAG ASSEMBLY WIRE HARNESS
(a) Remove the connector from the bracket.
(b) Remove the 5 clamps and wire harness from the seat
cushion frame
8. REMOVE SEAT CUSHION ASSEMBLY
(a) Remove the wire harness from the seat cushion asseml-
by.
(b) Remove the 4 bolts and seat cushion assemlby from the
seat adjuster.

RS07V±01
H02694
H02695
H02696
RS±58
± SUPPLEMENTAL RESTRAINT SYSTEMFRONT AIRBAG SENSOR
2289 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:

If the wiring connector of the SRS is disconnected
with the ignition switch in ON or ACC position, DTCs
will be recorded.

Never use SRS parts from another vehicle. When re-
placing parts, replace them with new parts.

Never reuse the sensor involved in a collision when
the SRS has deployed.

Never repair a sensor in order to reuse it.
1. REMOVE LH FRONT AIRBAG SENSOR
(a) Remove the 2 bolts and J/B cover.
(b) Remove the bolt and 2 nuts.
(c) Disconnect the connectors and hose, then remove the
J/B box.
(d) Disconnect the connector, then remove the bolt, nut and
sensor.