2000 LEXUS GS400 Service Repair Manual

I04051
Wire Harness Side
I04061
Open Close
1 2
BE±62
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2363 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSPECT VANITY LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
1 ± GroundConstantBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
7. Front door:
INSPECT DOOR COURTESY SWITCH CONTINUITY
(a) Connect the connector to the front door ECU.
(b) Check that continuity exists between terminals 1 and 2
when door is opened.
(c) Check that no continuity exists between terminals 1 and
2 when door is closed.
If continuity is not as specified, replace the switch.
8. Front door:
INSPECT DOOR COURTESY SWITCH CIRCUIT
Driver side: (See page DI±868)
Passenger side: (See page DI±900)

I04066
Open Close
1 2
I04052e±2±2±J
21
I04053
Wire Harness Side
I04054
1 2
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±63
2364 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
9. Rear door:
INSPECT DOOR COURTESY SWITCH CONTINUITY
(a) Connect the connector to the rear door ECU.
(b) Check that continuity exists between terminals 1 and 2
when door is opened.
(c) Check that no continuity exists between terminals 1 and
2 when door is closed.
If continuity is not as specified, replace the switch.
10. Rear door:
INSPECT DOOR COURTESY SWITCH CIRCUIT
Rear LH side: (See page DI±930)
Rear RH side: (See page DI±947)
11. INSPECT DOOR COURTESY LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
12. INSPECT DOOR COURTESY LIGHT CIRCUIT
Driver side: (See page DI±874)
Passenger side: (See page DI±906)
Rear LH side: (See page DI±934)
Rear RH side: (See page DI±951)
13. INSPECT LUGGAGE COMPARTMENT DOOR COUR-
TESY SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF (closed)±No continuity
ON (opened)2 ± Switch bodyContinuity
If continuity is not as specified, replace the switch.

I04185
Wire Harness Side
I04056e±2±2±J
I04053
Wire Harness Side BE±64
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2365 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
14. INSPECT LUGGAGE COMPARTMENT DOOR COUR-
TESY SWITCH CIRCUIT
(See page DI±792)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± Body groundLuggage compartment door courtesy switch ON
(door opened)Continuity
If circuit is not as specified, inspect power source or wire har-
ness.
15. INSPECT LUGGAGE COMPARTMENT LIGHT CONTI-
NUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
16. INSPECT LUGGAGE COMPARTMENT LIGHT CIR-
CUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
1 ± Body groundConstantContinuity
If circuit is not as specified, inspect power source or wire har-
ness.

I04057
ONOFF
1 2
I04058
Wire Harness Side
12
I04059e±2±2±J
1 2
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±65
2366 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
17. INSPECT GLOVE COMPARTMENT DOOR COURTE-
SY SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF (closed)±No continuity
ON (opened)1 ± 2Continuity
If continuity is not as specified, replace the switch.
18. INSPECT GLOVE COMPARTMENT DOOR COURTE-
SY SWITCH CIRCUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
1 ± GroundLight control switch OFFNo voltage
1 ± GroundLight control switch TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
19. INSPECT GLOVE COMPARTMENT LIGHT CONTINU-
ITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.

I04053
Wire Harness Side
I04060e±2±2±J
I04053
Wire Harness Side BE±66
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2367 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. INSPECT GLOVE COMPARTMENT LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundGlove compartment door courtesy switch ONContinuity
1 ± GroundLIght control switch in TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
21. INSPECT LICENCE PLATE LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
22. INSPECT LICENCE PLATE LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
1 ± GroundConstantContinuity
2 ± GroundLight control switch TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.

BE0GW±08
I01355
Ignition Switch
Driver Side Junction Block

GAUGE Fuse
Back±up Lights
Park/Neutral Position Switch
± BODY ELECTRICALBACK±UP LIGHT SYSTEM
BE±67
2368 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BACK±UP LIGHT SYSTEM
LOCATION

BE0GX±05
BE±68
± BODY ELECTRICALBACK±UP LIGHT SYSTEM
2369 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
INSPECT PARK/ NEUTRAL POSITION SWITCH CONTINU-
ITY
(See page DI±372)

BE0H6±08
I01356
Stop Light Switch
Driver Side Junction Block

STOP Fuse
Light Failure Sensor
Stop Lights
± BODY ELECTRICALSTOP LIGHT SYSTEM
BE±69
2370 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
STOP LIGHT SYSTEM
LOCATION