ECU LEXUS SC400 1991 Service Repair Manual

OVERALL ELECTRICAL WIRING DIAGRAM
1234
8 LEXUS SC300 (
Cont . ne xt pa ge )
4 ACC
IG1
ST1
AM1 2
1J
7 66 66 66 66
21J
5
1B
4 6666
66 66 66 2 1I
8
4 3 5 4
2
4 3
2
1 4
3
2
1 6
4
3
1
71124 1F 2F 3F
AABA A A B
C
B
A
B
A
A
A
A
A
A
BAABAABBB A A A A A B GGGF F
F
M
15 2 12 1 25 21 24 10 1 9
1 1326128 7 222 13 5 18 16 17 4 4 7IE2
1IO1
2 3
1 2
1
6
EB EA IJ M
2Bc2
12 IE2
H
4H 5H6H1H 2H3
I
2I 1J1
SFR SFL SRR SRL AST MT BSR BSM BSA
BS BM GND E2 PR VC SRC SMC SAC
MTT
BT M
EM2
BBBBBBBC
C
C
C
C
C
C
C
C
C
C
B
B
C 9IO1
EB1
6
10 IO1
3BW1 8BW1
6Bc2 5Bc2 2BW1 6BW1
7BW1
3B
1
221 1 112 2 320 741361511 7 81214 510
15 5 14 3 8 6 17
SFR SFL SRR SRL AST MT GND1 GND2 GND3 FL+ FL± FSS FR+ FR± RL+ RL± RSS RR+ RR± ALT LVL1 PKB W
B± Y
B±R
B±R R
VL
P± B
V±W R±B P
Y± B
LG
LG±B P± L
P± G
V±R
L
GR B
R± W
W±B (
SHIELDED )(
SHI ELDED)
B± R B± R
W± B L± Y G
V±Y
R± W
W± B MTT SR MR TMR E2 PR VC SRC SMC SAC TSR R± BAT I G STPTS WA TC D/G ABSO
RLORRO
FL OFRO
BRFA THFA
BRCBRP
TRCO NL PW±LR
Y
W
W
L±W B±R
R±B
L
Y R
V±Y
V±Y
V±Y
W
B±Y
R
R±W R
B±R
B±R
R
G± W
G±W B±Y
L±Y
R± B
Y
G
( SHI ELDED )
W
B
R
V± Y
V
V± W R± W R±W R±W
B±R V±Y W
W± L
V L
P±B
W± B W± B W± B
L±W Y± G
P± B P
B± Y
Y
L±W
L
W± B
W± B W± B
W
B
O±L
W± L W
O
O
W
W
O
L±GL±Y
L±G
L±Y Y±G Y±G
B
R±W
LR±W
B±Y V±R P± GP± L
LG±B LG
Y±B
P
R± B R±B V± W B±R B±R
V± Y
W±B W±B
(SHIELDED )
(
SHI EL DED )
(
SHI ELDED )I15
IGNITION SW
40A
IGSW
4 2 1456
R
T5
TRACTION PUMP
A N D MOT ORTRACTI ON BRAKE
ACTUATOR
ABS AND T RACTI ON ECU
60A MAIN
30A ABS NO. 2 60A ABS
NO. 1100A AM1
ABS
ACTUATOR
RELAY
ABS MOTOR
RELAY
TRACTION MOTOR
RELAY
TRACTION BRAKE
MAI N RELAY
10A DOME
6 BATTERY AB S A CT UA TOR
(SHI ELDED ) W± B
A7
ABS SPEED SENSOR
FRONT LH
A8
ABS SPEED SENSOR
FRONT RHA30
ABS SPEED SENSOR
REAR LH
F9
FUSE BLOCK
B±Y
From Stop Light
SW<4±6><5±6>
5BW1
A31
ABS SPEED SENSOR
REAR RH
From Alternator
º Lº < 1±2>
Power
Source ABS and Traction Control
B±R15A ECU±IGY
23 22 16 9 20 10 19
T3 ,T4
FG
(
SHI ELDED )
A4 , A5 , A6
HJ I A2 4 A , A25 B , A2 6 C
W
120A ALT
R
Fro nt s id e of
left fenderRight kick panel
Fr ont side of
right f ender
1
3
WhereEverybodyKnowsYourName

567 8
8LEXUSSC300(
Cont ' d )
22 11 4 14 8 1716 23
1B
5
3A
6 3E
3
3B
3 1E
11 3H 12
18 IK2 15 IK2 12 IJ 2 7IO1 8IO1
9IK2 5IK2 4IK2
2IK2 10IK1
23 E BRP
4E
TRCO 1D
BRC 5E
THFA 4D
BRFA 10 D
FRO 3D
FL O 12 D
RRO 5D
RLO 15 D
ABSO 8D
BAT 2E
IG1 6D
TC 16 E
TR5 11 D
IND 14 D
WT 5
K
15 K
1
K
7D P
16 D N
1EPKB
13 IK2 3H
7
From A/ T Indicat or SW
[ NEUTRAL START SW AND
BACK±UP LIGHT]< 3±7> 26 E
BCM
25 EB±
24 EB
11 E A
12 EA±
13 EACM
14 EGND
13 DCS W
3ES1
15 E
BM 2D
STP 21 E
TR2 6E
NE O 8E
VT H 19 E
VSH 10 E
IDL1 22 E
IDL2
6 2
16 IK2
13 IJ1 3H
14
1E
18 3A
2
1J
1
IJ IF EE
213645
BCM B± B A A± ACM 1J
52
3A
4
3D
13 1E
12 2 13 14
5EE1
1
L
To Engine and
ECT ECU< 2±8>
10A
GA U GE 7. 5A
TRAC
From Stop Light SW
<5±6><4±6>
From Trottle Position
Sensor< 2±8>
FromSubThrottlePosition
Sensor< 2±8>
WB±Y
L
V± R
P±G P±L
LG±B LG
Y±B P
R± B
V±W P±B L
V
R
B± R B± R
R±W L
GR
B
R±W GR
L V± W
P±B
WA TC TC ABS W TRC
B±Y
V± R
P±G P±L
LG±B LG
Y±B
P
R±B
R
B±R RR
R±B
B±Y
W
L±R Y
Y
L±R
G±W
Y± RP±L
V±Y
Y±L R
R±B
BR
Y± R
W± B
BR
G
W L
R Y B
B
W± B Y± R
W±B
W±B
W± B
BR L
GR
L
L
P±B
L±Y W
LG±R LG±R W P±B
V± W L±G
W
P±B
P±B
P±B
W±B
R± W
W
B±Y
TS WB
C3
CHECK
CONNECTOR T6
TDCL
(
Total Diagnstic
Communic ation Link )
TRACTION ECU ABS WARNI NG AND
TRACTION OFF INDICATOR
AND TRA CT I ON I NDI CA TOR
LI GHTABS
TRAC OFF
S8
SUB THROTTL E
ACTUATOR
T12
TRACTION CUT SW (
SHI ELDED )
ABS and Traction Control
To Parking Brake SW
(
Canada )
< 21±2>
To Brake Fluide Level SW
( USA )
< 21±2>
To Parking Brake SW
< 21±3>
C1 3 , C14 KL
T1 3 , T1 4 DE 7IJ2
L±R
ABS AND TRACTION ECU TRACTION ECUABS WARNING AND TRACTION OFF INDICATOR AND
TRA CT I ON I NDI CA TOR L I GHT
Right k ick panel Left k ickpanelRea r
side of
cylinder
head LH
G±W
E
E1
20
To Engine and
ECT ECU< 2± 8> BRBR
BR
1234 67891011
14 15 16 17 18 24
512
25 26
20
19 21 22 23 13 12345 7 891011
1214 15 16 17 18 22
6
19 20 21
13 12345678
16
15
14
13
12
11
10
9 12345678
16
15
14
13
12
11
10
9 1234 67891011
14 15 16 17 18 24
512
25 26
20
19 21 22 23 13
A
A2 4 B A2 5 CA26 DT13 DARK GRAY E T1 4 DARK GRAY
12 34 56 78
910 111213 141516 1718
17 18
1 2345 6789 10
23
22
21
20
19
15
14
13
12
11 16
K
C13 L C14 123
456
12
34
F
T 3 BLACK G T4 BLACK
WhereEverybodyKnowsYourName

OVERALL ELECTRICAL WIRING DIAGRAM
1234
9 LEXUS SC300
4ACC
IG1
ST 1
AM1 2
4 32
1
66 66
3H
12
1J
7
1B
4 666
66
3H
13 10IK1 25IK2 2IK2
5IO1 7IO1 1E
12 1I 82
1J
52
3A
4
3D
13 7IE2
3 BW1 8 BW1 7 BW1 2 BW1 6 BW1 5 BW1
2 Bc2 6 Bc2 5 Bc2
EB EA I J 12 IE2
M
4 3
5 4
2
6 6EB1
8 I O1 2 I O1
5A 4A 11A 21B 17B 6B 10B 11B 22B
1D 4D 3D 2D 5D
3C 1C16B 2B 13B 3A 10A 2A 1A 7A 14B 3B
1B6A12A8A9A 19 B 20 B
15
F 1
G
RR±
RR+
RL ±
RL+
FR±
FR+
FSS
FL ±
FL+
GN D3
GND2
PKB
MT
AST
SRR LY
B± R
ABS TC TC TS WAV±W
P± B
P±B VL
Y
B±R
R
L
L V
P±B
B±R
W±B
L±WB±R B±Y
R
V±Y
V± Y
W
W±L
R±YY± LL
B±R
W
Y
B±Y
P
Y±G
L±W
L±W
L
W± B
W± B
W± B
W± B
W± B
W
B W± B V±W
P±B
VL
O±L
W± L W
O W
O
L±G L±Y
L±Y
L±G
O
W
R
R± Y
V±Y
Y±L
221 1 112 2
14 4 111622
6 23
B±Y
W
L
R
W
SFR SFL
8BRS S
W± B V± Y
WB
40A I GSW I15
IGNITION SW
ABS MOTOR
RE LA Y ABS ACTUATOR
RELAY
T6
TDCL
(
Tot al Diagnos tic
Communic ation Link )
C3
CHECK CONNE CT OR
BATTERY F9
FUSE BL OCK
ABS ACTUATOR A7
ABS SPEED
SENSOR FRONT LHA8
ABS SPEED
SENSOR FRONT RHA3 0
ABS SPEED
SE NS OR RE A R L H A31
ABS SPEED
S ENSOR RE AR RH
ABS WARNING LIGHT
[COMB. METER]
10A
GAUGE
10A
DOME
15A
ECU±I G
ABS ECU (
w/oTractionControl )
ABS(
Anti±Lock Brake System )
To Par ki ng Brak e SW
< 21±2> R±W
( SHI ELDED )
( SHI ELDED )
( SHI ELDED )
(
SHIELDED ) (
SHI ELDED )
BAT
IG1
W
TS
TC
D/G
MR
R±
SR
60A MAIN
60A ABS
NO. 1
100A AM1
120A ALT
SFR SFL SRR AST MT
BM GND 3E
3
Power
Source4
2
7
6
R
BS
A4 , A33DC
B±R
C13 , C14 FG 2
1
A22 , A23 AB
W± B
W± B
W± B
P±B
ABS ECU
(w/oTractionControl )
ABS ACTUATOR ABS WARNING LIGHT
[COMB. MRTER]
Fro nt s id e of
left fender Fr ont side of
right f enderRight k ic k panel
C
4
D
A4
E
A5 GRAY
GRAY 1
3
1IO17
STP
G±W G±W
From Stop Light SW
< 5±6> < 4±6>B
2
1
34
1
2
3
45 6
WhereEverybodyKnowsYourName

1234
10 LEXUS SC300
4ACC
IG1
ST1
AM1 3
1J
7 1B
2
1J
8
1B
4 1H
8
1A
3A 5A 6A 2A 4A
7B 4B
9B 8B 10B 15B 13B 14B 12B 5B 6B 17 IF1 16 IF1
20 IF1
19 IF2 8 I F2 20 I F2 12823109
M
M
3IF1 4IF1 9IF2 1IF1 18IF1 2IF1 10IF1 3IP2 16IP1 1IP2 2IP2 9IP1
3126549 94562 16 B
2B
1B
3B
12 IP1
13 IP1
MM
13
W
W± L W± LW± L
W
W± L
W± LP± L
GR
P±B
Y±B
Y±R
LG±B LG
GR
P± B
Y± B
Y±R
LG±B L±R
W
BR± Y
BR±B
O
L±G
R± G
G±Y
B± W
B±W L±W
R± GG
LG±R
LG±B LG
BR±Y
BR±B
O
L±G
R±G G± Y
B±W
B±W L±W
R±G G
LG±R LG
LG±B
4
6 MVL MHL M+L VSRL VC HSRL E1 HSRR VSRR M+R MHR MVR
ACC +B SWB SWE SWLH SWLV SWRV SWRH SI
40A
IGSW
15A
ECU±B
7. 5A
RA DI O
No. 2
I15
IGNITION SW
120A ALT
100A AM1
F9
FUSE BL OCK SELECT
SW
RH
LH CONTROL
SW
UP
DOWN
RI GHT
LEFT
UP
DOWN
RI GHT
LEFT BEMLHMLVMRVMRH
R1 8
RE MOTE CONTROL MI RROR SW
To Tilt and Power
Telesc opic ECU
< 11±2>
R7 , R8
REMOTE CONT ROL MI RROR E CU
MV MH M+ VSRL VC HSRL E1 E1 HSRR VC VSRR M+ MH MV
BATTERY
R16
REMOTE CONTROL MIRROR LHR17
REMOTE CONTROL MIRROR RH
BA
P± L
Power
Source
Remot e Cont rol Mirr or
(
w/ Memor y )3
4
UP
DOWN
RIGHT
LEFT
UP
DOWN
RIGHT
LEFTB E MLH MLV MRV MRH
M
RH
LH
20 IF2 8 IF2 9 IF2
13IP1 12IP1 9IP1 MM MM Instrument
panel br ace
LH
IG
1D
10
1J
1 GND
11 B
LG±R
BR± B
R±Y LG±R LG±B
LG
LG
LG±B
LG±R
W± B W± B W±BW±B
89101123
132 213 1D
11 3
1H
L±G
LG±B
LG±R
LG±R GR
GR
W± R
R1 8
REMOTE CONTROL
MIRROR SW
R1 6
REMOTE CONTROL
MIRROR LH R1 7
RE MOTE CONTROL
MI RROR RH 2
134567
8 9 10 11 12 13 14 15 16 12
3456
BA
REMOTE CONTROL MIRROR ECU
R7 R8
Remote Control Mirror (
w/o Memory )
Left
kick
panelIF
3
WhereEverybodyKnowsYourName

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 ASW
16 A MSW
17 B
VC
11 A MRY
12 A M2
3A M1
8A ECUE
9A SO
1A SI
2A +
1B
IG 6B
P 18 A
BATT
IF IH 6BU1 47
68
3214
11
19 13 12 1B
2
1H
15
1C
8
1K
7
4B +B 2B
TEM+ 11 B
TEM±
10 B TIM+
6ATES
3B TIM±
7A TI S
M
M
10 1 5 6 3 4 1
WB
BR±B
B±R
R
L±W L±W R
GR
B±R
L±W L±Y L±B
R 6
5
BR 5W± L
W±L W
W
GR GR GR B±R
RR R
L±W
L±W
W
R± B
W± B
Y
B
W
BR±B
BR±B
R±WR±Y
R P
V±Y
V± W
B
W
BR±B
BR±B
P
R
R±Y
BR
P± L
R±L
R±B
Y±R
R±W
BR
L±Y
L±B
BR
W±B
60A MAIN
120A ALT 100A AM1F9
FUSE BLOCK 40A
IGSW
B±Y
GR B±R
BR±B
BR15A
ECU± I G 10A
DOME
Fr om A/ T Indicat or SW
< 3±6>
TI L T AND POWER TELESCOPI C ECU30A
POWER
30A
DOOR
TEL ESCO
LONG TILT
UP
TEL ESCO
SHORT TILT
DOWN
MANUAL SW AUTO SW
T I LT POSI TI ON
SENSOR
TI L T CONTROL MOTOR
TELESCOPIC POSITION
SENSOR
TE LE SCOP I C CONT ROL MOTOR No . 1
No . 2
SET
D1 2
DRIVING POSITION
MEMORY AND RETURN
SW
(
SHI ELDED )(
SHI ELEDED)
BATTERY
BR±B
T7
TELESCOPIC
POSI TI ON SENSOR
Power
Source Power Tilt and Power Telescopic
I15
IGNITION SW
6 74
To Unlock Warning SW
[IGNITION SW]< 4±4> < 5±4>
To Door Lock Mot or,
Door Unloc k Detec tion SW and
Door Open Detec tion SW LH< 17±4>
From Remote Cont rol Mirr or ECU
< 10±4> W
T10 A , T11 B
C17
TI LT AND POWER TELESCOPIC UNIT
[COMB. SW]
(
Cont . ne xt pa ge )
5
4
3
2
1
6789101112
12 34 56 78
9 10 1112 13 14 1516 1718
AA
T11 T10
TIL T AND POWER
TELESCOPI C ECU
W±L
Left kick panel Under t he ashtray LH2
1
3
4 1
2
To Parking Brake SW
< 21±2>
GR
( M/T )
(
A/T )
WhereEverybodyKnowsYourName

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

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 W±B
WW
W± L
Y
Y
5213
4
RR
L±W L±RL±Y
L±B
W±B
R
W±B G± Y
R±L
G±W
L
L
L
Y±R W± L
W
W±B R
G± Y
R
G±Y R± L
G± W
L G±W
R±L
W± B
W± B
10A
DOME
W± L W
1 2
R
60A MAIN
120A ALT
100A AM1
F9
FUSE BLOCK
D4
DAY/NI GHT
SHIFT SW INNER
MIRROR
M2
MOON ROOF CONTROL REL A Y
M3
MOON ROOF
CONTROL S W
POWER WI NDOW
RE LA YP5
POWER WINDOW MASTER SW AND
DOOR LOCK CONTROL SW LH
BATTERY
To Unlock Warning
SW<4±4><5±4>
From Theft Det err ent and
Door Lock ECU< 17±3>
P7
POWER WI NDOW
MOTOR RH
P6
POWER WI NDOW
MOTOR LH P4
POWER WI NDOW
CONTROL S W RHL
L 30A
POWER
POWER
MA I N RE LA Y
W±B
Power
Source Liquid Crystal
Inner Rear
View Mirror
Moon Roof Power Window
OP EN
CL OS E
UP
DOWN1
7 4589
8BZ1 7BZ1 6BZ1 2BZ1V
P
P±L
V± W NO. 2 NO. 1
M
4BZ1 5BZ1
B± Y
W± B
45
1326
B
6
BR
LG W
W± Y
B
W± B W± B
W±B
1BZ1 12
L
M4
MOON ROOF MOTOR
AND LIMIT SW
BZ13
L
R
WINDOW
LOCK 3 2
5 1
B
Left kick panel1
2
5
1F
R
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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±Y
L
L±R
L±W
L
B
G±R G±R
B WW
W± B
L
G±O G±O L
W±B
W± B
20A
WI PER
25A
HAZ±HORN
I15
IGNITION SW
40A
IGSW
60A MAIN 100A AM1
120A ALTF9
FUSE BLOCK HORN
RE LA Y
C15
HORN SW
[ COMB. SW]
To Thef t Deter rent and
Door Loc k ECU< 17±3>
11
HORN
H5
LH
H6
RH
BATTERY W5
WIPER MOTOR
WIPER RELAY
OFF
MIST
INT
LOW
HIGH
WASHER
INTTIME
+2 +1 S B B1 I N1 IN2 W E
WIPER AND WASHER SW
[COMB. SW] W2
WASHER
MOTOR
Power
Source
Wiper and Washer
B
6 74 WIPER AND WASHER SW
[COMB. SW]
C15B
,C16 A
C15
B
C1 6A
Horn
1
10 11 12 13 17 189
8
4
3
2 567
14 15 16 12
89
10 11 12 13 147
6
5
4
3
Left kick panel
5 6
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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
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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
4
1G
18
1E
13
1H 3
1G
1
IJ 1B
2
1G
11E 13
611
1211 10
11 10 12 9
1G
71G 9
3D
11
1E
31E 4
3A
3
3A
7
12
SPI RAL
CABLE
11
12
45 23 IK1
10 IK1 3B
2
3E
10
3E
33H 12
7
514
2
W
W± R
W±B
W±B
W±B
P±L
B±Y
B±O
L±R
L±R
L±R
B±R
B±R
L±R
B±O
W± R
W± R W± LB±O
B±Y
P±L
W± B P
LG±B
LG±R
W± B W± B R
W
GR B
YL
P± B
B±Y
B±Y
B±Y P±B
B±Y
P±B
B±Y P±B B± Y P± B
W± B W± B
V
P
LG±B
LG±R
G± W
V
W± B
W± B W
W±RW± L
W± L W± L W
W± R
40A
IGSW 15A
ECU± I G
15A
CI G
I15
IGNITION SW
100A AM1
120A ALT
30A AM2
30A INJ
SHI FT LOCK
SOLENOID
SHI FT LOCK
CONT ROL S W
F9
FUSE BLOCK S1 0
SHI FT LOCK ECU P2
PPS ECU
P1
PPS SOLENOI D
STP KLS+ E
E SPD SOL + SOL±
L±R
L G±RG
G±W
I15
KE Y I NTE RLOCK
SOLENOI D
[IGNITION SW]
Fr om Stop Light SW
<4±6><5±6>
From Combination
Meter< 21±5>
BATTERY E1 E2 +SL ±SL +SR ±SR D+ D± TC LA
+B
IG2
ACC
+B
IG
ACC
SLS+
SLS±
PT
P±
P2 7. 5A
IGN
15A
ECU± B
C12
AIRBAG
WARNING
LIGHT
[COMB. METER]
F1
FRONT AIRBAG
SENSOR LH F2
FRONT AI RBAG
SE NS OR RH
A29
AIRBAG SQUIB
T6
TDCL
(Total Diagnostic
Communicat ion Link )C3
CHECK CONNECTOR
TC AB TC AB
Power Source Shift Lock PPS SRS Airbag
C10
CENTER AIRBAG SENSOR ASSEMBLY
Right kick panel Left k ick panel
3
4
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