instrument panel LEXUS GS400 2000 Service Repair Manual

AC0WJ±01
I02365
Instrument Panel
Reinforcement
No.2 Brace
No.1 Brace
Water Hose
Bracket
Blower Unit Liquid Tube
Suction Hose
10 (100, 7)
Defroster Nozzle
Heater to Register
Center Duct
Air Duct
Air Duct RH
Center Air Duct
Air Duct LH

O±Ring
A/C Unit
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
AC±22
± AIR CONDITIONINGAIR CONDITIONING UNIT
2707 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AIR CONDITIONING UNIT
COMPONENTS

I02362
I02363
± AIR CONDITIONINGAIR CONDITIONING UNIT
AC±25
2710 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. REMOVE THESE PARTS:
(a) Cooler No.1 grommet
(b) Heater pipe grommet
(c) Drain hose grommet
(d) Instrument panel and reinforcement
(See page BO±91)
(e) Blower unit
(See page AC±30)
6. REMOVE 3 AIR DUCTS
(a) Remove the 2 screws and center air duct.
(b) Slide the floor carpet backward.
(c) Disconnect the wire harness clamps.
(d) Remove the 2 bolts and air ducts LH, RH.
7. REMOVE A/C UNIT
(a) Disconnect the connector.
(b) Remove the wire harness set nut.
(c) Disconnect the wire harness clamps.
(d) Remove the 2 nuts, bolt and A/C unit.

AC0WO±01
I02372 I02370
I02371
Instrument Panel
Reinforcement
Blower Unit
Bracket
Wire Harness
Air Duct
No.2 Brace
No.1 Brace
Air Refiner Filter
Cover
Blower Motor Air Inlet Servomotor
Blower Unit Case
± AIR CONDITIONINGBLOWER UNIT
AC±29
2714 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BLOWER UNIT
COMPONENTS

AC0WP±01
I02367
I02368
I02369
AC±30
± AIR CONDITIONINGBLOWER UNIT
2715 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE INSTRUMENT PANEL AND REINFORCE-
MENT
(See page BO±91)
2. REMOVE AIR DUCT
(a) Disconnect the connector clamp.
(b) Remove the 3 screws and air duct.
3. DISCONNECT WIRE HARNESS
(a) Release the claw of the connector bracket and discon-
nect the connector bracket.
(b) Disconnect the wire harness set clamps.
(c) Disconnect the wire harness.
4. REMOVE BLOWER UNIT
(a) Disconnect the connectors.
(b) Remove the 2 bolts and bracket.
(c) Remove the bolt, screw and nut.
(d) Remove the blower unit.

AC0X9±01
I02404
± AIR CONDITIONINGEXPANSION VALVE
AC±59
2744 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DISCHARGE REFRIGERANT FROM REFRIGERATION
SYSTEM
HINT:
At the time of installation, please refer to the following item.
Evacuate air from refrigeration system.
Charge system with refrigerant and inspect for leakage of refrig-
erant.
Specified amount: 600 ± 50 g (21.16 ± 1.76 oz.)
2. REMOVE INSTRUMENT PANEL
(See page BO±91)
3. REMOVE EXPANSION VALVE
(a) Pry out the packings.
HINT:
At the in time of installation, please refer to the following item.
Do not reuse the packing.
(b) Using SST, remove the 4 bolts and separate the expan-
sion valve and tube and accessory.
SST 07110±61050
Torque: 4.1 N´m (42 kgf´cm, 36 in.´lbf)
NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the in time of installation, please refer to the following item.
Lubricate 6 new O±rings with compressor oil and install them
to the tube and valve.

I03734
AC0XK±01
I03735
Front Side
I03736
AC±72
± AIR CONDITIONINGSENSOR
2757 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
SENSOR
REMOVAL
1. REMOVE SOLAR SENSOR
Using a screw driver, pull out the sensor and disconnect the
connector.
HINT:

Tape the screwdriver tip before use.

At the time of installation, please refer to the following
item.
Insert the sensor to instrument panel as shown in the il-
lustration.
2. REMOVE ROOM TEMPERATURE SENSOR
(a) Remove the No. 1 under cover.
(See page BO±91)
(b) Remove the room temperature sensor.
(1) Remove the No.1 safety pad set bolts and screws.
(2) Disconnect the connector and aspirator hose.
(3) Remove the screw and sensor.

I04029
Fuses
Relays 1. AM1 H±Fuse
2. WASHER Fuse
3. FOG Fuse
4. TAIL Fuse
B. Taillight Control Relay A. Fog Light Relay
C. Body ECU No.2
Driver Side Instrument Panel Junction Block
5. SRS±ACC Fuse
6. GAUGE Fuse
7. FUEL OPN Fuse
8. D FR DOOR Fuse
9. PANEL Fuse
10. HTR Fuse
11. SRS±B Fuse
12. P/SEAT (D) Fuse
13. RAD NO.2 Fuse
14. WIP Fuse
15. OBD Fuse
16. STOP Fuse
17. CIG Fuse
18. ECU±IG Fuse
19. STARTER Fuse
20. IGN Fuse
21. D FR DOOR Fuse
2
21 34 5
678 9
10 11 12 13
14 15 16 17
18 19 20AB
C 1
± BODY ELECTRICALPOWER SOURCE
BE±19
2320 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

I04030
Fuses
Relays 1. DEF H±Fuse
2. ±
3. ±
4. MIR HTR Fuse
A. Ignition Main Relay
B. Mirror Heater Relay
E. Body ECU No.1
Passenger Side Instrument Panel Junction Block
5. ±
6. ±
7. S/ROOF Fuse
8. P FR DOOR Fuse
9. ±
10. ±
11 .
12. P/SEAT (P) Fuse
13. DOME Fuse
14. SEAT HTR Fuse
15. ±
16. TV Fuse
17. ECU±B2 Fuse
18. ±
19. ±
20. ±
21. P FR DOOR Fuse
2
21 34 5
67 8 9
10 11 12 13
14 15 16 17
18 19 20AB
E
C. Defogger Relay
D. Heater Relay
CD
1
BE±20
± BODY ELECTRICALPOWER SOURCE
2321 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

± BODY ELECTRICALTROUBLESHOOTING
BE±5
2306 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) ºHI±Beamº does not light (All).
1. Headlight Dimmer Switch
2. Daytime Running Light Main Relay
3. Wire HarnessBE±37
BE±37
±
ºHI±Beamº does not light (One side).
1. Bulb
2. H±LP L±UPR Fuse
3. H±LP R±UPR Fuse
4. Daytime Running Light No.3 Relay
5. Wire Harness±
BE±21
BE±21
BE±37
±
ºFlashº does not light.
1. Headlight Dimmer Switch
2. Daytime Running Light Main Relay
3. Wire HarnessBE±37
BE±37
±
Headlight does not come on.
1. Headlight Control Relay
2. Daytime Running Light Main Relay
3. Daytime Running Light No.2, 3, 4 Relay
4. Headlight Dimmer Switch
5. Light Control Switch
6. Wire Harness
7. *Light Control ECU
8. BulbBE±37
BE±37
BE±37
BE±37
BE±37
±
±
±
Headlight does not come on with light control switch in HEAD.
1. Light Control Switch
2. *Light Control ECU
3. Wire HarnessBE±37
±
±
Headlight does not go out with light control switch in OFF.
1. Headlight Control Relay
2. *Light Control ECU
3. Wire HarnessBE±37
±
±
Headlight flickers.
1. Bulb
2. *Light Control ECU
3. Wire Harness±
BE±37
±
Headlight is dark.
1. Bulb
2. *Light control ECU
3. Wire Harness±
±
±
Taillight does not come on with light control switch in TAIL.
1. Taillight Control Relay (Instrument Panel J/B)
2. Light Control Switch
3. Wire HarnessBE±37
±
±
Taillight does not go out with light control switch in OFF.
1. Taillight Control Relay
2. Light Control Switch
3. Wire HarnessBE±37
BE±37
±
Headlight does not come on with engine running and light control
switch in OFF.
1. ECU±B Fuse
2. GAUGE Fuse
3. Daytime Running Light Main Relay
4. Daytime Running Light No.2, 3, 4 Relay
5. Generator L Terminal
6. Parking Brake Switch
7. Wire HarnessBE±21
BE±21
BE±37
BE±37
DI±853
BE±92
±
*: HID Type

IN±16
± INTRODUCTIONFOR ALL OF VEHICLES
16 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(h) AIRBAG SENSOR ASSEMBLY
(1) Never reuse the airbag sensor assembly involved
in a collision when the SRS has deployed.
(2) The connectors to the airbag sensor assembly
should be connected or disconnected with the sen-
sor mounted on the floor. If the connectors are con-
nected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause
undesired ignition of the supplemental restraint sys-
tem.
(3) Work must be started after 90 seconds from the
time the ignition switch is turned to the ºLOCKº posi-
tion and the negative (±) terminal cable is discon-
nected from the battery, even if only loosing the set
bolts of the airbag sensor assembly.
(i) WIRE HARNESS AND CONNECTOR
The SRS wire harness is integrated with the instrument
panel wire harness assembly. All the connectors in the
system are a standard yellow color. If the SRS wire har-
ness becomes disconnected or the connector becomes
broken due to an accident, etc., repair or replace it as
shown on page RS±68.