2000 LEXUS GS400 height

BE±6
± BODY ELECTRICALTROUBLESHOOTING
2307 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HEADLIGHT BEAM LEVEL CONTROL SYSTEM
SymptomSuspect AreaSee page
Beam axis is not controlled. (It is not initialized.)
Headlight Beam Level Control System does not operate.
1. ECU±IG Fuse
2. Headight Beam Level Control Actuator
3. Headlight Beam Level Control ECU
4. Wire Harness SideBE±21
BE±50
BE±50
±
Beam axis is not controlled. (It is initialized.)
Headlight Beam Level Control System does not operate.1. Height Control Sensor
2. Headlight Beam Level Control ECU
3. Wire Harness SideBE±50
BE±50
±
Controlled angle of head light is unusual.
(The angle is controlled.)
1. Height Control Sensor
2. Headlight Beam Level Control ECU
3. Headlights
4. Wire Harness Side±
BE±50
BE±3
±
Beam axis position is not stable during driving.
1. ABS System
2. Headlights
3. Wire HarnessDI±387
BE±3
±
FOG LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Fog light does not light up with light control SW HEAD
(Headlight is normal.)
1. FOG Fuse
2. Fog Light Relay
3. Fog Light Switch
4. Wire Harness
5. Body No.2 ECUBE±21
BE±53
BE±53
±
±
Fog light does not light up with light control SW HEAD
(Headlight does not light).1.*1 Other Parts
2. Wire Harness±
±
Only one light does not light up.1. Bulb
2. Wire Harness±
±
*1: Inspect Headlight System
TURN SIGNAL AND HAZARD WARNING SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
ºHazardº and ºTurnº do not light up.
1. GAUGE Fuse
2. TURN HAZ Fuse
3. Ignitioin Switch
4. Turn Signal Flasher Relay
5. Wire HarnessBE±21
BE±21
BE±31
BE±56
±
Hazard warning light does not light up.
(Turn is normal)1. Hazard Warning Switch
2. Wire HarnessBE±56
±
Turn signal does not light up.
(Hazard is normal)1. Turn Signal Switch
2. Wire HarnessBE±56
±
Turn signal does not light up in one direction.1. Turn Signal Switch
2. Wire HarnessBE±56
±
Only one bulb does not light up.1. Bulb
2. Wire Harness±
±

BE01R±06
I01351
Headlight Beam Level Control Actuator
Height Control SensorHeadlight Beam Level Control ECU
Driver Side Junction Block

ECU±IG Fuse

GAUGE Fuse
± BODY ELECTRICALHEADLIGHT BEAM LEVEL CONTROL SYSTEM
BE±49
2350 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HEADLIGHT BEAM LEVEL CONTROL SYSTEM
LOCATION
The vehicle shown in this illustration is ºGS400º.
All components of ºGS300º other than the ones used for engine are same as ºGS400º.

F02847
Stop Light Switch
Push Rod
Pedal HeightBR0JB±07
F02849
Pedal Freeplay
± BRAKEBRAKE PEDAL
BR±9
2117 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BRAKE PEDAL
ON±VEHICLE INSPECTION
1. CHECK PEDAL HEIGHT
Pedal height from asphalt sheet:
150.0 ± 160.0 mm (5.906 ± 6.299 in.)
2. IF NECESSARY, ADJUST PEDAL HEIGHT
(a) Remove the No. 1 under cover, end pad, No. 1 safety pad
and No. 7 heater to register duct (See page BO±88).
(b) Disconnect the connector from the stop light switch.
(c) Loosen the stop light switch lock nut and remove the stop
light switch.
(d) Loosen the push rod lock nut.
(e) Adjust the pedal height by turning the pedal push rod.
(f) Tighten the push rod lock nut.
Torque: 25 N´m (260 kgf´cm, 19 ft´lbf)
(g) Install the stop light switch.
(h) Push in the brake pedal 5 ± 15 mm (0.20 ± 0.59 in.), turn
the stop light switch to lock the nut in the position where
the stop light goes off.
(i) Connect the connector to the stop light switch.
(j) After installation, push in the brake pedal 5 ± 15 mm (0.20
± 0.59 in.), check that stop light lights up.
(k) After adjusting the pedal height, check the pedal freeplay.
(l) Install the No. 7 heater to register duct, No. 1 safety pad,
end pad and No. 1 under cover.
3. CHECK PEDAL FREEPLAY
(a) Stop the engine and depress the brake pedal more than
40 times until there is no more pressure left in the booster.
(b) Push in the pedal by hand until the second point of resis-
tance begins to be felt, then measure the distance, as
shown.
Pedal freeplay: 0.2 ± 2.0 mm (0.008 ± 0.079 in.)
If incorrect, check the stop light switch clearance. If the clear-
ance is OK, then troubleshoot the brake system.
Stop light switch clearance:
0.5 ± 2.4 mm (0.020 ± 0.094 in.)
HINT:
The freeplay to the 1st point of resistance is due to the play be-
tween the clevis and pin. It is 0.2 ± 2.0 mm (0.008 ± 0.079 in.)
on the pedal.

B01863B01866B02081
8 7
6 5
43
2
1
Stopper
Bolt
SSTTank
Lock
Plate
B01861(1) (2)(3) (1)
(1)(1)(1) (3)
(3)
(3) (3)
B01864B01870B02082
B01869
H
± COOLING (2JZ±GE)RADIATOR
CO±21
1559 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. CAULK LOCK PLATE
(a) Lightly press SST against the lock plate in the order
shown in the illustration. After repeating this a few times,
fully caulk the lock plate by squeezing the handle until
stopped by the stopper plate.
SST 09230±01010
HINT:

Do not stake the areas protruding around the ports (1),
flange (2) and bracket (3).

The points shown in the illustration cannot be staked with
the SST. Use pliers or similar object and be careful not to
damage the core plates.
(b) Check the lock plate height (H) after completing the caulk-
ing.
Plate height (H): 7.40 ± 7.80 mm (0.2913 ± 0.3071 in.)
If not within the specified height, adjust the stopper bolt of the
handle again and caulk again.
6. INSTALL ECT SWITCH
(a) Install a new O±ring to the ECT switch.
(b) Install the ECT switch.
7. INSTALL DRAIN PLUG
(a) Install a new O±ring to the drain plug.

A02820
EM2011
EM2538
A02817
Plastigage
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±45
1399 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
9. INSPECT CAMSHAFTS FOR RUNOUT
(a) Place the camshaft on V±blocks.
(b) Using a dial indicator, measure the circle runout at the
center journal.
Maximum circle runout: 0.08 mm (0.0031 in.)
If the circle runout is greater than maximum, replace the cam-
shaft.
10. INSPECT CAM LOBES
Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake44.310 ± 44.360 mm (1.7445 ± 1.7465 in.)
Exhaust44.250 ± 44.350 mm (1.7421 ± 1.7461 in.)
Minimum cam lobe height:
Intake44.16 mm (1.7386 in.)
Exhaust44.10 mm (1.7362 in.)
If the cam lobe height is less than minimum, replace the cam-
shaft.
11. INSPECT CAMSHAFT JOURNALS
Using a micrometer, measure the journal diameter.
Journal diameter:
28.949 ± 28.965 mm (1.1397 ± 1.1404 in.)
If the journal diameter is not as specified, check the oil clear-
ance.
12. INSPECT CAMSHAFT BEARING
Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cyl-
inder head as a set.
13. INSPECT CAMSHAFT JOURNAL OIL CLEARANCE
(a) Clean the bearing caps and camshaft journals.
(b) Place the camshafts on the cylinder head.
(c) Lay a strip of Plastigage across each of the camshaft jour-
nals.
(d) Install the bearing caps. (See page EM±52)
Torque: 20 N´m (200 kgf´cm, 14 ft´lbf)
NOTICE:
Do not turn the camshaft.
(e) Remove the bearing caps.

EM0DD±03
A02689SST
A02688
Bushing bore diameter
mm (in.)
10.985 ± 11.006 mm
(0.4325 ± 0.4333 in.)
11.035 ± 11.056 mm
(0.4344 ± 0.4353 in.)Both intake and exhaust
Bushing
size
Use STD
Use O/S
0.05
A02744
SST
P04791
IntakeExhaust
38.5 mm
(1.516 in.)40.5 mm
(1.594 in.) EM±48
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1402 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
REPLACE VALVE GUIDE BUSHINGS
(a) Using SST and a hammer, tap out the guide bushing.
SST 09201±10000 (09201±01060),
09950±70010 (09951±07100)
(b) Using a caliper gauge, measure the bushing bore diame-
ter of the cylinder head.
(c) Select a new guide bushing (STD or O/S 0.05).
If the bushing bore diameter of the cylinder head is greater than
11.006 mm (0.4333 in.), machine the bushing bore to the follow-
ing dimension:
11.035 ± 11.056 mm (0.4344 ± 0.4353 in.)
If the bushing bore diameter of the cylinder head is greater than
11.056 mm (0.4353 in.), replace the cylinder head.
(d) Using SST and a hammer, tap in a new guide bushing to
the specified protrusion height.
SST 09201±10000 (09201±01060),
09950±70010 (09951±07100)
Protrusion height:
Intake12.3 ± 12.7 mm (0.484 ± 0.500 in.)
Exhaust11.4 ± 11.8 mm (0.449 ± 0.465 in.)
HINT:
Different bushings are used for the intake and exhaust.

IN04Q±07
IN±36
± INTRODUCTIONTERMS
36 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
ACAlternating Current
ACCAccessory
ACISAcoustic Control Induction System
ACSDAutomatic Cold Start Device
A.D.D.Automatic Disconnecting Differential
A/FAir±Fuel Ratio
AHCActive Height Control Suspension
ALRAutomatic Locking Retractor
ALTAlternator
AMPAmplifier
ANTAntenna
APPROX.Approximately
A/TAutomatic Transmission (Transaxle)
AT FAutomatic Transmission Fluid
AUTOAutomatic
AUXAuxiliary
AV GAverage
AV SAdaptive Variable Suspension
BABrake Assist
BACSBoost Altitude Compensation System
BATBattery
BDCBottom Dead Center
B/LBi±Level
B/SBore±Stroke Ratio
BTDCBefore Top Dead Center
BVSVBimetallic Vacuum Switching Valve
Calif.California
CBCircuit Breaker
CCoCatalytic Converter For Oxidation
CDCompact Disc
CFCornering Force
CGCenter Of Gravity
CHChannel
COMB.Combination
CPECoupe
CPSCombustion Pressure Sensor
CPUCentral Processing Unit
CRSChild Restraint System
CTRCenter
C/VCheck Valve
CVControl Valve

IN±38
± INTRODUCTIONTERMS
38 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) H±FUSE
High Current Fuse
HIHigh
HIDHigh Intensity Discharge (Head Lamp)
HSGHousing
HTHard Top
HWSHeated Windshield System
IACIdle Air Control
ICIntegrated circuit
IDIIndirect Diesel Injection
IFSIndependent Front Suspension
IGIgnition
IIAIntegrated Ignition Assembly
INIntake (Manifold, Valve)
INTIntermittent
I/PInstrument Panel
IRSIndependent Rear Suspension
J/BJunction Block
J/CJunction Connector
KDKick±Down
LANLocal Area Network
LBLiftback
LCDLiquid Crystal Display
LEDLight Emitting Diode
LHLeft±Hand
LHDLeft±Hand Drive
L/H/WLength, Height, Width
LLCLong±Life Coolant
LNGLiquified Natural Gas
LOLow
LPGLiquified Petroleum Gas
LSDLimited Slip Differential
LSP & PVLoad Sensing Proportioning And Bypass Valve
LSPVLoad Sensing Proportioning Valve
MAX.Maximum
MICMicrophone
MILMalfunction Indicator Lamp
MIN.Minimum
MPMultipurpose
MPXMultiplex Communication System
M/TManual Transmission
MTMount
MTGMounting
NNeutral
NANatural Aspiration
No.Number
O/DOverdrive