LEXUS GS400 2000 Service Repair Manual

N22087
21
N21865
(a)
1(b)
2
2
1
N22088
21
N22089
21
N21865
(a)
(b)
2
1
1 2 BE±172
± BODY ELECTRICALPOWER SEAT CONTROL SYSTEM
2473 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Disconnect the leads from the terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 (1) and the negative (±)
lead to terminal 1 (2), check that the seat cushion begins
to descend.
If operation is not as specified, replace the seat adjuster.
13. INSPECT LIFTER MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, check that the
motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.
14. INSPECT LIFTER MOTOR PTC THERMISTOR OPERA-
TION
(a) Connect the positive (+) lead from the battery to terminal
2 (1), the positive (+) lead from the ammeter to terminal
1 (2) and the negative (±) lead to the battery negative (±)
terminal, then move the seat cushion to the highest posi-
tion.
(b) Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.
(c) Disconnect the leads from the terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 1 (2) and the negative (±)
lead to terminal 2 (1), check that the seat cushion begins
to descend.
If operation is not as specified, replace the seat adjuster.
15. INSPECT RECLINING MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, check that the
motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.

N21868
21
N21869
21
I04163
1 2
I05473
1 2
I04165
21
± BODY ELECTRICALPOWER SEAT CONTROL SYSTEM
BE±173
2474 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
16. INSPECT RECLINING MOTOR PTC THERMISTOR OP-
ERATION
(a) Connect the positive (+) lead from the battery to terminal
2, the positive (+) lead from the ammeter to terminal 1 and
the negative (±) lead to the battery negative (±) terminal,
then recline the seat back to the most forward position.
(b) Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.
(c) Disconnect the leads from the terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 1 and the negative (±)
lead to terminal 2, check that the seat back begins to fall
backward.
If operation is not as specified, replace the seat adjuster.
17. INSPECT LUMBAR SUPPORT MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, check that the
lumbar support moves to release side.
(b) Reverse the polarity, check that the lumbar support
moves forward.
If operation is not as specified, replace the seat adjuster.
18. INSPECT LUMBAR SUPPORT MOTOR CIRCUIT
BREAKER OPERATION
(a) Connect the positive (+) lead from the battery to terminal
2 and the negative (±) lead to terminal 1 on the lumbar
support motor connector and move the lumbar support to
front end position.

I04166
21
BE±174
± BODY ELECTRICALPOWER SEAT CONTROL SYSTEM
2475 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Continue to apply voltage, check that a circuit breaker op-
eration noise can be heard within 4 to 60 seconds.
(c) Reverse the polarity, check that the lumbar support be-
gins to move release side with in spproximately 60 se-
conds.
If operation is not as specified, replace the motor.

BE02J±10
I01368
Mirror Assembly

Mirror Motor
Mirror Switch

Left/Right Adjustment Switch

Mirror Control SwitchIgnition Switch
Driver Side Junction Block

Body ECU No.2
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
BE±175
2476 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER MIRROR CONTROL SYSTEM
LOCATION

BE10W±02
I04167
Left/Right Adjustment Switch
Mirror Switch
9
7
6
5 8
I07733
Retract Switch
Mirror Switch
Left/Right
Adjustment Switch
Mirror Switch
Retract Switch 9
8
7
6
5
BE±176
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
2477 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. USA/CANADA models:
INSPECT MIRROR SWITCH CONTINUITY
Switch positionTester connectionResistance (W)
LEFT8 ± 9100
RIGHT8 ± 90
Illumination5 ± 6Continuity
Measure resistance between terminals 7 and 9.
Switch positionResistance (W)
UPApprox. 100
RIGHT250
DOWN470
LEFT800
If continuity is not as specified, replace the switch.
2. USA/CANADA models:
INSPECT MIRROR SWITCH CIRCUIT
(See page DI±837)
3. TAIWAN model:
INSPECT MIRROR SWITCH CONTINUITY
Switch positionTester connectionResistance (W)
LEFT8 ± 9100
RIGHT8 ± 90
Illumination5 ± 6Continuity
Measure resistance between terminals 7 and 9.
Switch positionResistance (W)
UPApprox. 100
RIGHT250
DOWN470
LEFT800
If continuity is not as specified, replace the switch.
4. TAIWAN model:
INSPECT RETRACT SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF±No continuity
ON1 ± 2Continuity
If continuity is not as specified, replace the switch.
5. TAIWAN model:
INSPECT MIRROR SWITCH CIRCUIT
(See page DI±837)

I04270
5 4
I04271
5 4
I04272
56
I04273
56
I04168
12
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
BE±177
2478 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. w/o Driving position memory:
INSPECT MIRROR MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
4 and the negative (±) lead to terminal 5, and check that
the mirror turns to the left side.
(b) Reverse the polarity, and check that the mirror turns to the
right side.
(c) Connect the positive (+) lead from the battery to terminal
6 and the negative (±) lead to terminal 5, and check that
the mirror turns upward.
(d) Reverse the polarity, and check that the mirror turns
downward.
If operation is not as specified, replace the mirror assembly.
7. w/o Driving position memory:
INSPECT MIRROR MOTOR CIRCUIT
Left side: (See page DI±882)
Right side: (See page DI±916)
8. w/ Driving position memory:
INSPECT MIRROR MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, and check that
the mirror turns to the left side.

I04169
12
I04170
62
I04171
62
I04172
6 28
9
11
I04173
6 28
9
11
BE±178
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
2479 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Reverse the polarity, and check that the mirror turns to the
right side.
(c) Connect the positive (+) lead from the battery to terminal
6 and the negative (±) lead to terminal 2, and check that
the mirror turns upward.
(d) Reverse the polarity, and check that the mirror turns
downward.
If operation is not as specified, replace the mirror assembly.
9. w/ Driving position memory:
INSPECT MIRROR MOTOR CIRCUIT
Left side: (See page DI±882)
Right side: (See page DI±916)
10. w/ Driving position memory only:
INSPECT MIRROR POSITION SENSORS OPERATION
HINT:
Strip off the vinyl tape of the connector and remove terminals
1, 2, 6, 8, 9, 10 and 11 from the connector housing.
(a) Connect a series of three 1.5 V dry cell batteries.
(b) Connect the positive (+) lead from the dry cell batteries to
terminal 8 and the negative (±) lead to terminal 11.
(c) Connect the positive (+) lead from the voltmeter to termi-
nal 9 and the negative (±) lead to terminal 11.
(d) Apply battery positive voltage to terminals 2 and 6, then
check that the voltage gradually changes according to the
table below while the mirror moves between the upper-
most position and lowermost position.
Mirror
positionLowermostMirror
positionUppermost
Voltage2.8 ± 5.0Changes
gradually0 ± 1.8
If voltage value is not as specified, replace the motor assembly.

I04174
2
18
10
11
I04175
2
18
10
11
I04176
SW1
SW2
SET Switch
I07732
When folded front
At drive
position
At retract position(a)
(b)
(c)
(d)
(e)
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
BE±179
2480 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(e) Disconnect the 4 leads of the battery and voltmeter.
(f) Connect the positive (+) lead from the voltmeter to termi-
nal 10 and negative (±) lead to terminal 11.
(g) Apply battery positive voltage to terminals 1 and 2, then
inspect that the voltage gradually changes according to
the table below while the mirror moves between the left±
most position and right±most position.
Mirror
positionLeft±mostMirror
positionRight±most
Voltage
LEFT2.8 ± 5.0Changes
gradually0 ± 1.8
Voltage
RIGHT0 ± 1.8Changes
gradually2.8 ±5.0
If voltage value is not as specified, replace the motor assembly.
11. w/ Driving position memory only:
INSPECT MIRROR POSITION SENSORS CIRCUIT
Left side: (See page DI±884)
Right side (See page DI±918)
12. INSPECT DRIVING POSITION MEMORY AND RE-
TURN SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
SET switch ON1 ± 7Continuity
Return SW1 ON1 ± 3Continuity
Return SW2 ON1 ± 5Continuity
If continuity is not as specified, replace the switch.
13. INSPECT DRIVING POSITION MEMORY AND RE-
TURN SWITCH CIRCUIT (See page DI±887)
14. TAIWAN models:
INSPECT ELECTRICAL RETRACT MOTOR OPERA-
TION
(a) When folded front position:
(1) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the mirror operates at retract position.
(2) Reverse the polarity, check that the mirror does not
operate.
If operation is not as specified, replace the mirror assembly.
(b) Between folded front position and driving position:
(1) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the mirror operates at retract position.
(2) Reverse the polarity, check that the mirror operate
at folded front position.
If operation is not as specified, replace the mirror assembly.

BE±180
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
2481 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) When driving position:
(1) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the mirror operates at retract position.
(2) Reverse the polarity, check that the mirror does not
operate.
If operation is not as specified, replace the mirror assembly.
(d) Between driving position and retract position:
(1) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the mirror operates at retract position.
(2) Reverse the polarity, check that the mirror operate
at return position (Stopping at driving position).
If operation is not as specified, replace the mirror assembly.
(e) When retract position:
(1) Connect the positive (+) lead from the battery to ter-
minal 1 and negative (±) lead to terminal 2, check
that the mirror does not operates.
(2) Reverse the polarity, check that the mirror operate
at return position (Stopping at driving position).
If operation is not as specified, replace the mirror assembly.

BE0HC±06
I01369
Electro Chromic Outer Mirror
Electro Chromic Inner Mirror
Driver Side Junction Block

ECU±IG Fuse
± BODY ELECTRICALELECTRO CHROMIC MIRROR SYSTEM
BE±181
2482 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ELECTRO CHROMIC MIRROR SYSTEM
LOCATION