LEXUS SC400 1991 Service Repair Manual

OVERALL ELECTRICAL WIRING DIAGRAM
1234
5 LEXUS SC300
1J
7 22 2 21J
81B2
4
1B
5
1B
4 1K
11
22 22
22
44
1I 1E
3 1
4 2 3
4
1 2 23
1
5
4
ACC
IG1
ST1
AM1 3
2
1 21 2 1
21
2
19 IE1 12 IE1 11 IE1 5IE1 6IE1
9IG1
4
7
6 4
15 19 21 1
3 16 20 22 2
18 497 313
6 7
IJ 8IG1 1J
5
3A 1E 1C
1A
1I
15
1C
1F
1K 3D
7B 1A
2 1 9
10
BK IF 1H
1K 1J 1E W± BY Y
G± O G
G
W± L
Y
Y
W±B
R
W±B W±B R±YW± G
G± W
W± LW± L
W± L W
W± B
R±W W± B
W± B
R
R
LG±B G±W
L±W P± B
G±L
R± W
R± W
BR± W
B±L
B± L
W± B
W± B
W±B W±B W±B W±B W±B
W± B W± B
R±W
R±W
R
W±B R±B R± W
R± W R±G
R
W
G± W
G± W R
R R
W
P±L W
G G
P±L
B±Y
W
R± Y R±L R
Y VPower
Source
F9
FUSE BL OCK60A MAIN
100A AM1
120A ALT
22W
R±Y
TH
15A
HEAD
LH±LWR
15A HEAD RH±LWR
15A HEAD RH±UPR 15 A HEA D L H± UP R
40A
IGSW
H3LH
H4 RH
H2 RH H1LH
HEADLIGHT
(
LO )
HEADLIGHT (
HI )
DIMMER
RE LA Y HEADLIGHT
RELAY
Fr om Connerring Light
Relay< 8±7> DI ODE10A DOME
7. 5A RADIO No. 2
LIGHT
CONTROL
DIMMER
OFF
TAI L
HE AD
LOW
HI GH
FLASH ED HL HU HF EL T H
C15
COMBINATI ON
SW
BATTERY
C13
HIGH BEAM
I NDI CA TOR L I GHT
[COMB. METER]
To Door Lock Mot or and
Unlock Detection SW and
Doo r Open De t ect i on S W LH
< 17±1>
To Door Lock Mot or and
Unlock Detection SW and
Doo r Open De t ect i on S W RH
< 17±1> From Open Door War ning Light
From Per sonal Light< 6±2>
B4
BACKLE SW LH
I15
UNLOCK WARNING SW
[IGNITION SW] SEAT BELT WARNI NG
LI GHT[ COMB. MET ER]
5118
TAIL LIGHT
RELAY
To Thef t
Deter rent and
Do or L oc k ECU
< 17±3>
7. 5A PANEL15A TAIL
10A
GAUGE
3 12 2
13 4Y
BELT
H± LP B A CC TA I L I NTB I G
BKL KEY
12 2
9
To Thef t Deter rent
and Door Loc k ECU
< 17±3>
I15
IGNITION SW
I16
I NTEGRAT I ON REL AY
DIM TOUT
HF
HU
Y± B
R±L
CHG± P KBY±G
B
From Alternator º Lº < 1±2>
From Park ing Br ake SW < 21±2>
1 3 2
B±Y
G± O
1C
16DI ODE
1E
1
9
C1 2 , C1 4 AB
6
From Tens ion Reducer
Solenoid LH< 11±7>
Fr om Thef t Deter rent and
Door Loc k ECU< 17±2>
Fr om Day /Night Shift SW< 12±1>
Fr om Tilt and Power Teles copic
ECU< 11±1> Y
Y
W±B
12C 11C 5C
CCC CC 4C2C 9 8 7 10 13 111 12 7
642 8 105 GND
I NTEGRATI ON REL AY
SEAT BELT
WARNING LIGHT
[COMB. METER]
10 11 12 13 17 18 19 20 21 12345 6789
14 15 16
17 18
1 2345 6789 10
23
22
21
20
19
15
14
13
12
11 16 C
A
B I16
C12
C1 4
Headlight (
for Canada ) Unlock and
Seat Belt Warning
(
for Canada )
(
Cont . ne xt pa ge )
2
1
3C 1C
13
Y
12345678910111213
18
17
IG
W±B
6Ba2Ba 1
11
5Ba2 Ba 1
12 (
w/ Memor y )
( w/o Memory )
B±L
( w/ Memor y )
( w/o Memory )
XX
Right kic k panel
Unlock the center
pillar LHLeft kic k
panel
WhereEverybodyKnowsYourName

567 8
5LEXUSSC300(
Cont ' d )
1
2
1
2 1D
11 E 1I
10
3G
1
1B
2
3A
9
1C
10
1E
20
1H
1
9BU1
1Bd15IG7
11 Bc 1
Bc1 2 1
1 2
3A
10
1 2
3 84
921117
3G
83A 2
3A
1
2
12
1
1
4
1
2 1
2
EA BM BL 2Bd14
1
3
8
2 3
3C
3
3F
5
3H
1
3F 1
2
1
3
2
9
5
1
10
F 5
G
6
7
12
3A 9
3E 6
3E 6
3E
6
3H 2
3H 1
3H 1
2
10 11 1 2
G
GW±G
W± G
GW±G
G±O
G±O
G±O
G±O
G±O W± G W± G W± G
W± G W± G
W± G
G± W
W± BY Y
G±O
G
G
W± L
G
G
G
GW±BW± B W± B W± B
G
Y
V± G
V± G Y
G±W
G± W
W± B
GGG
G
W
G± W
G± W
B
W± B R± W
B
G±W G± W G±O
G±O
W
±B W
W± GBR
Y±V L±B L
W± B
W± B
W± B
W± B
W± B
G
W± G
W± B
±PK ±STP E HS +STP
ETCRLRVREILL±
7
G± O
G± O
+PK BWRN
T
15A
STOP
F3
LH
F4
RH
FRONT
CLEARANCE LI GHT
L3
LI GHT FAI LURE SENSOR
RE AR LI GHT WARNI NG
LI GHT[ COMB. MET ER]
S12
STOP L I GHT SW
To ABS ECU<8±3><9±4>
To Shi f t Lock ECU< 15±2>
G2
GLOVE BOX
LI GHT SW
F5
LH
F6
RH
FRONT SI DE
MARKER L I GHT
L2
LI CE NCE
PLATE LI GHT
W± BW± B
W± BH9
HI GH MOUNT
STOP L I GHT
H8
HI GH MOUNT
STOP L I GHT A15
A / C C ON TR OL SW
AND RADI O SW
RADI O AND PLAYER
( w/ o CD Pl ayer )
R2
RADI O AND PLAYER
( w/ CD Pl ayer )
T1 2
TRACTI ON CUT SW AND
SEAT HEATER SW
C1 1
CI GARETTE LI GHTER
A21
A/ T I NDI CATOR LI GHT E8
ECT PATTERN
SELECT SW
T1 5
TRI P SW AND THEFT DETERRENT
I NDI CATOR LI GHT
R9
RHEOSTAT
G1
GLOVE BOX
55
13 13W± B
W± B
W± B W± B W± B
R± W
G± R
R± W G± R G±RTAI L AND
STOP LI GHT
[ REAR COMB.
LI GHT]
R1 0
LH
R1 1
RH
TAI L
ST OP
TAI L
ST OP
To Engi ne and ECT ECU< 2±3>
To Tr act i on ECU< 8±8>
To Cr ui se Cont r ol ECU< 16±4>
To Cr ui se c ont r ol
ECU< 16±4>
To Po wer Se at E CU
(Dr i ver ' s )
< 11±5>
G± W
G± W
(
* 2
)
( * 2
)
(
* 1
)
C13 , C14
ED
H
H
H
H
I3C
1
17
2345
COMBI NATI ON METER C12 , C14 IH R5 , R6
FG
12 34
5678910
12
3456
RADI O AND PLAYER
(
w/ o CD Pl ay er )
Taillight and Stop Light (
for Canada )
Illumination(
for Canada )
*2:
(
w/ o Rear Spoi l er )
*
1:
(
w/ Rear Spoi l er )
W 10 11 12 13 17 18 19 20 2112345 6789
14 15 16
17 18
1 2345 6789 10
23
22
21
20
19
15
14
13
12
11 16 C1 2 I
C1 4 H
COMBI NATI ON METER
G±W
W± L
G± O (
* 1
)
Fr o nt s i de of
r i ght f ender Fr o nt s i de o f
l ef t f ender Bac k panel cent er
RE AR LI GHT WARNI NG
LI GHT[ COMB. MET ER]
10
3H
2
3G 62
IQ1 2
IQ14
GW±G GW±G
G
W ±G
A1
A/ C CONTROL
ASSEMBLY
23G
W± GH7
HAZARD SW
R5 F G
R6
WhereEverybodyKnowsYourName

OVERALL ELECTRICAL WIRING DIAGRAM
1234
6 LEXUS SC300
2
3A
6
2
1F
81H 91D61H10 1E 11
3D
4
2 1 2
12
1 2
1 2
1
6 22
12
11
3
7 11 A
12 B
4BX1 17 IP1
25 Bc 1
1F
6
1J
1
IF 1
To Int egr ation Relay
< 5±3> < 4±3>
1 2
5
1B
W±B
W± B
RR
W
W±B
W±B
W± B
W± B
BR±WR±W R±W R
RR
R
R
R
R
RR
R
R
RR
R± W R±W R± W
R±W
R± W R± W
R± W R
R±W
W
R
10A
DOME
60A MAINF9
FUSE BL OCK
VANITY LI GHT
V5
LH
V6
RH
P20
PERSONAL
LIGHT
LH
RH
ON
OFF
DOOR
I14
IGNITION KEY
CY LI NDER LI GHT
S1 1
ST EP LI GHT
D5
DOOR COURTESY
LIGHT LH
L7
LUGGAGE COMPARTMENT
LIGHT
D6
DOOR COURTESY
LIGHT RH
To Door Lock Motor,
Do or Unl oc k De t ec t i on SW an d
Do or Ope n De t ec t i on S W LH
< 17±5>
From CD Automatic Chenger
< 20±1>
4o Door Lock Motor,
Do or Unl oc k De t ec t i on SW an d
Do or Ope n De t ec t i on S W RH
< 17±5>
To Int egr ation Relay
< 5±3> < 4±3>
L6
LUGGAGE COMPARTMENT
LIGHT SW
OPEN DOOR WARNING
LI GHT [ COMB. MET ER]
BATTERY
Power
Source Interior Light
W
From Theft Deterrent
and Door Lock ECU
< 17±2> R±W
C12 , C14
BA OPEN DOOR WARNI NG LIGHT
[COMB. METER]
10 11 12 13 17 18 19 20 21 12345 6789
14 15 16
17 18
1 2345 6789 10
23
22
21
20
19
15
14
13
12
11 16 B
A
C12
C14
Lef t kic k panel
W± B
(
w/oMoonRoof )
( w/ Moon Roof )
WhereEverybodyKnowsYourName

1234
7 LEXUS SC300
4ACC
IG1
ST 1
AM1 2
1J
7 1J
5
1B
4 1E
72
74
6 1
2
4
5
3
2
1C
4
1A
7
2 3EB 6
5 12 IQ1 10 IQ1
11 IQ1
10 IG1 23 I G1
IG2
8
IG2 9
IE1
9
IQ23
IQ2 13
IQ2 8
1H
11 1H 7
4
4 4
4
4
12
43
1E
19 1E 14 1C 31A4
3A
1
1J
1 3G
3
1E
18
IF
BM EA 10
3D
6
1K
2 3
23 B
16 A 17 A
5756
6
3
10 8 9
4 WW
W± RR± B
R±W G±Y
G±B W± R
G±R
WWW±B
G±R
W±RR±B
R± W
R± WR±B
W± B
G±R B±Y
W
R± W R±B
R± W
R±B
R± B
R±W
W± B
R±B
R±W
G±Y G±Y G±B
G±B
W±B
W±B
W±B
W±B
W±B
W± B
W± B
W±B W±B G±B
G±Y
WW
W±L W
W
B± Y
60A MAIN
100A AM1
120A ALT
I15
IGNITION SW 20A
TURN
25A
HA Z± HORN
TURN SIGNAL FLASHER
BATTERY
F7
F RONT T URN S I GNA L
LIGHT LH
R1 0
REAR TURN SI GNAL LI GHT LH
[REAR COMB. LIGHT LH]
R11
REAR TURN SIGNAL LIGHT RH
[ REAR COMB. LIGHT RH] F8
F RONT T URN S I GNA L
LIGHT RH C1 6
TURN SI GNAL SW
[COMB. SW]
TURN SIGNAL INDICATOR
LIGHT[ COMB. METER]
OFF
ON B1 F B2TLTBTR
H7
HA ZA RD SW
B
FOD FOE
FOG FOF
1I
1
1I
2
55 55
2 1 5
3
18 IE1
17 I E1
1 2 1
2
EA
8
11
10
W± G
G± R
G± R
W± B
W± B
W±B R±G
P± Y
R±G
P± Y R± YTo I ntegrat ion Relay
<5±2><4±2>
CORNERI NG
LIGHT RELAY
C16
CONE RI NG L I GHT
SW[COMB. SW]CORNERI NG LI GHT
C6
LH C7
RH
F9
FUSE BLOCK
Power
Source
Cornering Light Turn Signal and Hazard Warning Light40A
IGSW TURN SIGNAL INDICATOR LIGHT
[COMB. METER]
12 34 56 78
9 10 1112 13 14 1516 1718 17 18
1 2345 6789 10
23
22
21
20
19
15
14
13
12
11 16
AB
C13 C14
C13 A , C14 B
Front side of
r ight fender Fr ont side of
left fender Bac k panel
c enterFront side of
r ight fenderLeft kick
panel
6
5
WhereEverybodyKnowsYourName

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