1991 LEXUS SC400 Service Repair Manual

oil temperature charging brakes lug pattern load capacity service schedule

Page 3969 of 4087

LEXUS SC400 1991 Service Repair Manual
OVERALL ELECTRICAL WIRING DIAGRAM
1234
11 LEXUS SC300
4ACC
IG1
ST1
AM1 2
1J
51C 6
1I
82
1J
7
1B
51C 1
1H
10
1B
4 1K
13 2
18 BT1 6Ba1
12 BT1 BT1 13 BT1 13 I F2 IF1 IF1 I F1
7B
GN D2
10 AUNSW
5AE1
4A A

Page 3970 of 4087

LEXUS SC400 1991 Service Repair Manual
567 8
11 LEXUS SC300(
Cont d )
2 1
M
2
1M
2
1M
M BK
Ba 1 Ba1 Ba1
8Ba1 3Ba1
Ba 14Bb1BL
17 BX1 18 BX1
18 BX1
5Bb1 6Bb1 7Bb1
Ba1
7
1 21
42
3
23222 13651 1313
CDC
D
C C C C C C C DDDDDDDD
D DCD DDDC
M

567 8
11 LEXUS SC300(
Cont ' d )
2 1
M
2
1M
2
1M
M BK
Ba 1 Ba1 Ba1
8Ba1 3Ba1
Ba 14Bb1BL
17 BX1 18 BX1
18 BX1
5Bb1 6Bb1 7Bb1
Ba1
7
1 21
42
3
23222 13651 1313
CDC
D
C C C C C C C DDDDDDDD
D DCD DDDC
M
21 M
12
D
C
C
2Ba1
346251
10 12 11
3
4
8
69
5
2
1
131
2
7
14
2
C
6 7 7152 9 4 111312145 10
193114122
16 6 14 3 10 5 15 8 17 1 8 18
B±R
R
L±W L±W R
GR
B±R
RL±W
R
L±W
VVV W±B W±B
BR±B
L±W
L±W
G±W
BR±B BR±B BR±B BR±B
BR± B
BR± BB
W Y±B BR BR BR
L±W
W± B BR BR
W±B W±B W±B
L
L±B V
LG
BR
BR
L±Y L±R
L±W
L±W
L±Y
L±R
V± R
W± B R
B
V± W
LG±R Y BR
BR
BR
B
R
L±W L±W
RB±R
B±R
L±W
V±B Y± R
Y±L
Y±G L±R
L±Y
L±B LL±W L±W
Y± L
Y± G L±RL±Y
L±B L
GR
G±W
LG
V
V
V Y±G
V± W
Y±R
Y±B
WB
W± B
W± B
BR±B
W± B
W
B
W± B
BR±B BR±B
BR±B
BR±B BR±B
G± W
B± R
SSRS PVCC SSSR RCL+ RCL± SSFV SSRV SI SO GND GND2 SGND
STOP I G SYSB P SLD+ SLD± FRV+ FRV± RRV+ RRV± +B2 +B
SL DFSLDR
FUPFDWN
RUPRDWN
RCLFRCLR
+B SYSB PRDC SLSW RRSW RFSW
SLDR SLDF GND SLD+ SLD± PVCC SSRS SGND 5 6 16 7 17 3 11 15 81 9 2 13 10
21
M
R
4912 13
G±R
G
P8
POWER SEAT CONTROL SW
(for Driver' s Seat )
From Stop Light SW
< 4±6> < 5±6>
POWER SEAT ECU (
Dr i ver ' s S sa t )
S20
SLI DE
POSITION
SENSOR LH P16
POWER
SEAT MOTOR
(
f or Driver' s
Seat Rclining
Contr ol ) F1 9
FRONT
VERTICAL
POSITI ON
SENSOR
R1 9
RE AR
VERT I CAL
POSI TI ON
SENSOR
P18
P OWE R S EA T MOT OR
(for Pass enger' s Seat
Reclining Control )
P9
POWER SEAT
CONTROL SW
(
for Pas senger ' S
Seat )
S21
SLIDE
POSI TION
SENSOR RH
P1 9
POWER SEAT MOTOR
(
for Passenger' s
Se at Sli d e
Co nt r o l )
T18
TENSION
REDUCER
SOLENOID LH
S1 9
SLIDE LIMIT SW
R2 0
RECLINING LIMIT SW
P12
POWER SEAT ECU (
Pas senger ' s Seat )
(
SHI ELDED )
Power Seat (
Driver' s ) Power Seat
(
Passenger' s )
and
Electric Tension Reducer
P15
POWER SEAT MOTOR
( for Driver' s Seat
Slide Control )
P13
POWER SEAT MOTOR
( for Driver' s Seat
Front Vertic al
Control )
P14
POWER SEAT MOTOR
( for Driver' s Seat
Rear Vertical
Control )
SL I DE F RONT SL I DE REARF. VER. UP
F . VE R. DOWN R. VER. UP
R. VER. DOWN RE C. F RONTRE C. RE AR
LUMBAR
SUPPORT FRONT
REAR
P14
POWER SEAT MOTOR
(
f or Driver' s Seat
Lumbar Suppor t
Cont rol )
D
LG±R
1 2BB±RT19
TE NS I ON REDUCER
SOLE NOI D RH
To Buc kl e
SW LH
<4±4><5±4>
D3
DIODE
(
f or Tens ion
Reducer )
B±L
L±W
RE AR
FRONT
VCC O/ P
GND
FRONT
RE AR
FRONT
RE AR
SLIDE RECLINING
B± R
P10 , P11 C
C 1 2
B±Y BRPBCL
12B5
BUCKLE SW RH2
134567
8 9 10 11 12 13 14 15 16
12 34 56 78
9 10 1112 13 14 1516 1718 D C
P10
P11
POWER SEAT ECU
(
Driver' s )
Under the center
pillar LH Under the center
pillar RH
2
1
WhereEverybodyKnowsYourName

Page 3971 of 4087

LEXUS SC400 1991 Service Repair Manual
OVERALL ELECTRICAL WIRING DIAGRAM
1234
12 LEXUS SC300
2
1B
5
1F
9 2
1F
8
1I
15
6 237
2 1
4 11 1B
2
1D
91J 21I 7
10 8 9 5 1 4
11 IF2 3 IF2
11 IP1 3 IP1 2 IP1
M
12
M
12
1D
10 1J 1
1F
6
IF
51
42
3
W± B

Page 3972 of 4087

LEXUS SC400 1991 Service Repair Manual
1234
13 LEXUS SC300
4ACC
IG1
ST 1
AM1 2
1J
7 21J
5
4
1B
4 2
441H
16
8IE1
9IE1
M
1
13
4 3
265 32
14 M
21
4IE1 3IE1
6B
7A 8B 17B 14A 13A
1J
1 1K
6
IF
L
L±W L±R
R± L L
W±B
B
G± R
WW
W± L W
B±YW
B

Page 3973 of 4087

LEXUS SC400 1991 Service Repair Manual
OVERALL ELECTRICAL WIRING DIAGRAM
1234
14 LEXUS SC300
1J
41J 7 1J
5
2
44
11
1B
4
441K
13 4 1A
52
22
3 1
4
2
3
2
4
1
5 22
13 IE1
2Bb1
10 IG2
16 IG1
3232
4
ACC
IG1
ST1
AM1 3
2
2 1
IF BL Bk EB
4Bb1
3H
1

OVERALL ELECTRICAL WIRING DIAGRAM
1234
14 LEXUS SC300
1J
41J 7 1J
5
2
44
11
1B
4
441K
13 4 1A
52
22
3 1
4
2
3
2
4
1
5 22
13 IE1
2Bb1
10 IG2
16 IG1
3232
4
ACC
IG1
ST1
AM1 3
2
2 1
IF BL Bk EB
4Bb1
3H
14
1E
18 3A
1 11
3232 1B
1
1J
8
3A
5
1D
11H 4
1C
7 1E
2
3F
5
4IP2
10 Bc 2
20 IP1 4
1
2 2
IJ
BL
B
B
W± B
W
W± LB
WB
B
B
B±R
B
B
W± B
W± B
W± B
W±B
W± B
G
L
R± Y R± Y B
R± Y
W± B
W±B W±B W±B W±B
W± B L
G
GL
R±L
L±R B
L±R
L±R B
W± B
W± B W± B
W± B
W±B
W± B
L±R P±L
L±R B B
P±L
B± Y
B±Y
120A ALT 100A AM1F9
FUSE BOX4
3
I15
IGNITION SW
40A
IGSW 15A
ECU±I G
15A
SEAT±HTR
SEAT HEATAER SW
S18
SEAT HEATER RH
( f or Driver' s Seat Cushion )
S16
SEAT HEATER LH
( f or Pas senger ' s Seat Cus hion )SEAT HEATER
RELAY
W Y
W Y
W± B
To A/C Con tro l
Assembly< 22±7>
BATTERY
S1 7
SEAT HEAT ER RH
( for Driver' s
Se at Bac k )
S1 5
SEAT HEAT ER LH
( for Passenger' s
Se at Bac k )
DEFOGGER
RELAY
10A
HT R
50A
DEFOGGER 10A
MI R± HT R
4 3
LH
RH
MIRROR HEATER
[ REMOTE CONTROL MIRROR]
C22
CHOKE COI L
RE AR WI NDOW
DE FOGGE R
C11
CIGARETTE
LIGHTER
15A
CI G
N2
NOI SE
FILTER
( for Def ogger Syst em )
Power
Source Seat Heater
Rear Window Defogger and
Mirror HeaterCigarette
Lighter
6 54
Lef t kick panel Under t he center pillar
RHUnd er t he
center pillar
LHFr ont s ide of
left fender
Under the
center
pillar RHRight k ic k panel
2
1
1
1J 10
1D 8
3F 2Ba2
Ba1
14
5Ba2 Ba1
12 *
1
* 2
* 1
* 2
3 BY1 2 BU1
5B 7A
10 A 3 A3B 4B
1
B
8
A (
A/ T )
( M/ T )
(
A/T )
( M/T )
*2: (
w/ o Memory Power Seat )
*
1:
(
w/ Me mo r y P ower S ea t )
L
G
W±B (
* 3
)
8E 8E
5F
(
* 4
)
5F 4F 7E
( * 4)
4F
(
* 3)
7E (
* 3)
( * 4)
( * 3
)
( * 4
)
*
3: (
w/ Me mor y )
* 4: (
w/ o Memo r y )
9876 4321 5 54 21
3
E
R16, R17 F
R1 6, R17
MI RROR HE A TER
[ R EMOT E C ON RT OL MI RR OR ] MIRROR HEATER
[REMOTE CONRTOL
MIRROR]
123456
12 34
5 6 10 11 789B
(
A/T )
S24
A
(
M/T )
T12
S2 4 B , T1 2 A
SEAT HEATAER SW
1C
1D
R14 C , R15 D
(* 3) (
* 4 )
L
B
1
1
C
R14 D
R15
REAR WI NDOW DEFOGGER
R17
R1 6 E F
EF
WhereEverybodyKnowsYourName

Page 3974 of 4087

LEXUS SC400 1991 Service Repair Manual
1234
15 LEXUS SC300
4ACC
IG1
ST1
IG2
AM1
3
2
6
11 AM2
1J
7 1J
81J 51J 3
1B
4 1E
21E 17 1I9
1G
6 1G
10
3G
6 3A
5
7IG2 16 IJ26IJ2
16 IE1
4 9 14 13 1
6 42 3315 138453
2 4
7 8 3H
15
3A
1
12 IG1
1
2
IJ IF

Page 3975 of 4087

LEXUS SC400 1991 Service Repair Manual
OVERALL ELECTRICAL WIRING DIAGRAM
1234
16 LEXUS SC300
4ACC
IG1
ST1
IG2
AM1 2
1
11 AM2
3A
4
1J
7
1B
5 1J
5
2
1J
5
3C
4
1B
4 1E
12 1K 13 2 1K 4
3E
13A 8
3D
13 1H 10
16 IE1
15 IG1
10 IK1 2IJ2 1IJ2 9IJ2

Page 3976 of 4087

LEXUS SC400 1991 Service Repair Manual
MEMO
WhereEverybodyKnowsYourName

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deactivate passenger airbag service indicator automatic transmission wiring diagram radio controls climate control