Lexus SC300 / Lexus SC400. Service manual — part 996
OVERALL ELECTRICAL WIRING DIAGRAM
1
2
34
21
LE
XU
S
S
C
300
(C
ont
.
ne
xt
pa
ge
)
4
AC
C
IG
1
ST
1
IG
2
AM
1
3
2
6
11
A
M
2
1J
7
1B
4
16
IE
1
20
IK
1
10
IK
2
1I
E
1
1J
31
J
51
J
82
1
B
2
1E
1E
18
1E
1H
1E
2
1
E
13
1B
IG
1
20
3D
3A
4
3D
2
3C
6
3A
2
3F
1
2
1
6
3F
5
3C
5
3A
IK
1
6
IK
1
7
10
IJ
1
IE1
10
IG
1
18
EB
19
IG
1
ED
E
A
13
IE
2
14
IG
3
W–
R
R
Y
B–
O
Y–
B
V–
R
V–
Y
R–
W
L–
R
W
R–
Y
B
V–
W
V
R
L–
R
P–
L
R
L–
R
L–
R
P–
L
P–
L
Y
B–
O
B–
Y
P–L
W–L
R–
W
B
W–
B
R–
W
B
W
W
W–L
W–L
W–L
W
W–R
Y–B
V–R
V–Y
R–W
V–Y
V–R
Y–B
W–R
W
W–R
B–O
R–W
R –W
B
B
R–W
R–W
R–W
V–Y
BR
W–B
R–W
Y
W–B
Y
R
47
1
3
21
1
1
4
12
8
7
9
2
1
2
3
40A
IG
SW
100A
AM
1
120A
ALT
60A
M A
IN
30A
IN
J
30A
AM
2
14
9
I1
5
IG
N
ITIO
N
SW
7.5
AI
G N
10A
G A
U G
E
15A
C IG
10A
DO
ME
15A
EC
U–B
Fro
mABS
EC U
<9–2
>
Fro
mABS
EC U
<8
–5>
(*1
)
(*2
)
6
BA
T
T
E
R
Y
F9
F
U
SE
BL
O
C
K
12
O2
O IL
PR
ES
SU
RE
SW
C5
C O
OLAN
TL
EU
EL
WAR
N IN
GS
W
E6
ENG
IN
EO
IL
LEV
EL
WAR
N IN
GS
W
P3
PA
R
K
IN
G
BR
AK
E
SW
D2
DIO
D E
(for
Par
king
Brake
)
B1
BR AK
EF
LU
ID
LEV
EL
SW
B
B
R–W
R –W
R–
W
R–
W
B
B
B
(C
anada
)
(C
anad
a)
(U
SA
)
(US
A)
(US
A
)
(U
SA
)
(C
a
nad
a
)
(C
ana
da
)
(C
anada
)
(*2
)
(*1
)
(US
A
)(
US
A
)
(US
A)
R–
W
R–
W
Fro
mD
ayt
im
e
R unn
ing
Lig
ht
R elay
<4–
4>
F
rom
C
rui
se
C
on
tr
o
l
E
C
U
<
16
–2
>
T1
5
TR
IP
S
W
A
N
D
TH
E
FT
D
E
TE
R
R
E
N
T
IN
DI
CA
T
O
R
L
IG
H
T
S3
SP
EED
SE
N
S
O
R
N
o
.
1
From
Trac
tion
EC
U
<8–7
>
2
W
12
1
2
2
54
11
13
*
1:
(w
/
T
rac
tio
n
C
ont
rol
)
*
2:
(w
/oT
ra
c
tio
nC
o
n
tr
o
l)
Po
w
e
r
S
our
c
e
C
o
m
b
inat
ion
M
et
er
R–
W
L–
R
R
4
3
SE
CU RI
TY
M
H
SE
T
R
ESE
T
A/
B
W1
W
A
SH
ER
LE
V
E
L
S
W
P–L
L–R
R
W–
R
Fro
mABS
EC U
<8–5
>
(*1
)
R
R
1
0
11
1
2
13
17
18
1
9
20
2
1
12
34
5
67
89
14
15
16
1
2
34
56
78
9
10
1
11
2
13
14
1
51
6
171
8
17
18
1
234
5
678
9
10
23
22
21
20
19
15
14
13
12
11
16
AB
C
C1
2
C1
3
C
1
4
C
O
M
B
IN
AT
IO
N
M
ET
ER
1
1
23
DE
F
U
EL
SE
N
D
ER
F1
7
F1
8
R
ear
si
de
of
c
yl
inde
r
he
ad
L
H
F
ront
si
de
o
f
ri
gh
t
fen
d
er
F
ront
s
ide
o
f
lef
t
fend
er
2
1
2
2
1
1
1
B
S
H
O
R
T
CO
N
NE
CT
O
R
1
2
12
F
S2
3
G
S2
2
7B
U
1
From
Tilt
and
Pow
erT
eles
copi
c
EC
U<
11–2
>
GR
B
(M/
T
)
3
G–
B
F
ro
m
T
h
ef
t
D
et
er
rent
and
D
o
or
Lo
ck
E
C
U
<
17
–2>
5
6
7
8
21 LEXUS SC300(Cont’ d)
AIR BAG
CHARGE
OIL
OIL LEVEL
COOLANT
LEVEL
REAR
LIGHT
PWR
ABS
TRAC
TRAC OFF
CRUISE
WASHER
O/D OFF
FUEL
SEAT BELT
P
R
N
D
2
L
A
C
C
A
A
B
B
B
C
C
C
C
C
C
C
B
C
C
B
B
B
A
B
A
A
C
C
A
A
A
A
A
A
A
A
C
C
C
C
C
C
A
C
C
B
B
B
B
B
A
A
C
C
10
:
0
0
BK
1E
18
3D
10
3A
1
1J
1
1K
12
IH
IF
ED
IK1
8
IK2
IK1
9
1
E
3
E
2
E
1
D
BU1
10
BU1
3
BU1
4
11
11
1
14
19
8
18
11
13
6
18
17
16
20
19
15
13
3
15
5
1
20
9
18
8
11
8
7
1
2
3
4
5
16
17
2
3
4
5
10
9
12
23
12
4
17
16
7
6
15
10
22
21
W–R
R
Y
B–O
Y–B
V–R
V–Y
R–W
L–R
W
R–Y
B
V–W
V
R
L–R
P–L
Y–B
B–Y
B–W
W–B
BR
B
W–B
W–B
BR–B
Y–G
B
Y–G
BR–B
W–
B
W–B
W–B
BR
–
B
W–
B
BR
Y–
G
WATER
TEMP.
HIGH BEAM
TURN
LH
RH
BRAKE
DOOR
TACHO
TR
IP
SP
EE
D
IL
L
U
M
IN
A
T
IO
N
CHECK–
ENGINE
FUEL
See Taillight and
Stop Light System
<4–6><5–6>
See Engine Control System
<2–3>
See ABS System<8–7><9–3>
See Cruise Control System
<16–3>
See ABS and Traction
Control System<8–7>
See ECT and A/T Indicator
System<3–5>
D
F17
, F18
E
FUEL SENDER
Y–B
B–Y
B–W
24
See SRS Airbag System<15–4>
See Charging System<1–2>
See Headlight System<4–1><5–1>
See Turn Signal and
Hazard Warning
Light System<7–3>
See ECT System<3–5>
From Neutral Start SW<1–3>
See Interier Light System<6–3>
From Igniter ” TAC” <1–5>
To Engine and ECT ECU<2–7>
To Cruise Control ECU<16–3>
To PPS ECU<15–2>
See Illumination System
<4–7><5–7>
See ECT and A/T Indicator
System<3–6>
See Unlock and Seat Belt
Warning System<4–4><5–4>
W3
WA
T
E
R
T
E
M
P
.
SE
N
D
E
R
Combination Meter
1
COMBINATION METER
C12 , C13 , C14
A
A
B
IG1
8
Under the
center
pillar LH
Under the
ashtray LH
Left
kick panel
Rear side of
cylinder head RH
C
2
G
2
F
1
F
14
L–R
P
P
SHORT CONNECTOR
S22 G , S23
F
L–R
OVERALL ELECTRICAL WIRING DIAGRAM
1
2
34
22
LE
XU
S
S
C
300
(C
ont
.
ne
xt
pa
ge
)
4
AC
C
IG
1
ST
1
AM
1
3
2
1J
7
21
J
51
K
2
22
22
1B
4
2
1A
5
22
2
22
2
1
3
5
4
5
3
1
2
EB1
E
B1
3I
N
1
2I
N
1
IN
1
6
1I
N
1
12
IN
1
EB
IJ
1
2
M
2
1
2
A
1
B
2
B
M
1A
IJ
1
2
5
4
216
4
6
12
4
74
3
W
B
P–
L
B–
Y
LW
–
G
R
W
P–
L
R–
L
L–
W
G–
Y
G–
R
R–
L
R–
W
BR
–
W
G–
W
BR
R–
Y
V
W–
G
BR
G–
Y
Y
B–
R
BR –W
G –W
BR
R –Y
V
W–
B
L
BR
G–Y
R
L–R
W–
B
W –B
W –B
W–B
W–B
B
W –L
W
W
W
B
L
W
I1
5
IG
N
IT
IO
N
SW
40A
IG
SW
60A
M A
IN
120A
ALT
100A
AM
1
F9
F
U
SE
BL
O
C
K
B
A
TTE
R
Y
To
Engi
neand
EC T
EC
U <
2–7
>
A/
C
M
AG
N
E
T
IC
CL
UT
C
H
R
E
L
A
Y
10A
H E
ATE
R
60A
H E
ATE
R
T
o
R
a
di
o
a
nd
P
lay
e
r
<
1
9–
3>
<
2
0–2
>
F
ro
m
R
adi
o
and
P
lay
e
r
<1
9
–
3
><2
0
–
1
>
F
ro
m
R
adi
o
and
P
lay
e
r
<1
9
–
3
><2
0
–
1
>
T
o
R
a
di
o
a
nd
P
lay
e
r
<
1
9–
3>
<
2
0–2
>
5
12
L–W
R–
L
C O
O L
WAR
M
Po
w
e
r
S
our
c
e
A
ut
om
at
ic
A
ir
C
ondi
tioner
R–
L
R–
L
R–
L
B
W–B
W –B
B3
BL
O
W
E
R
R
E
SIST
O
R
(fo
r
L
o
w
S
pee
d
)
A2
A/C
L
O
C
K
S
EN
SO
R
AN
D
A
/C
M
A
G
N
ET
IC
CL
UT
C
H
A1
7
,
A
1
8
A/C
P
O
W
ER
T
R
AN
SIST
O
R
AB
A2
7
A
IR
M
IX
CO
NT
RO
L
S
E
R
V
O
M
O
T
O
R
HE
A
T
E
R
RE
L
A
Y
B2
BL
O
W
E
R
MO
T
O
R
Y
B–
R
A/
C
P
O
W
E
R
T
R
AN
S
IST
O
R
L–W
L–R
W
12
12
AB
A1
7
A1
8
A/C
C
O
N
T
R
O
L
AS
SEM
BL
Y
1
23
45
6
7
8
9
10
11
12
14
15
13
12
34
5
6
7
8
9
1
0
11
12
13
14
15
16
2
0
21
2
2
23
24
25
12
34
56
78
9
10
11
17
1
8
19
EC
D
A1
2
A1
3
A
1
4
Fr
o
n
t
sid
e
o
f
lef
t
fen
der
Ri
g
h
t
ki
c
k
pan
el
1
2
5
6
7
8
22 LEXUS SC300(Cont’ d)
1
2
II1
7
II1
2
IR2
5
IR2
4
IR2
IR1
IR1
IR1
IR1
IR2
IR2
IR2
IR2
1J
8
2
1E
2
2
5
1B
3A
3A
3A
3E
3H
3G
3B
3G
11
1E
IQ1
IQ1
IQ1
IQ1
IQ1
IQ1
II1
5
IR2
IR1
IR1
IR1
IN1
4
EB1
1
2
IR1
13
IR1
IR1
5
IQ1
17
IQ1
6
IQ1
2
1
1
2
3
1
IQ1
16
D
D
D
D
D
D
C
D
D
D
E
E
D
IR1
4
D
C
C
D
D
E
IQ1
D
E
C
D
C
E
E
E
D
D
D
D
D
D
IQ1
C
E
D
IR1
IR2
5 IN1
1E
18
1J
1
EA
IF
POWER
VOLUME
AUTO
BC
D
S
W
(R
oom
T
e
m
p
.
C
ont
rol
S
W
)
M
E
IR1
M
W
P–L
R–L
L–W
G–Y
G–R[
R–L
R–W
BR–W
G–W
BR
R–Y
V
W–G
BR
G–Y
Y
B–R
R–G
B–Y
B–R
Y
G–O
V–R
V–W
L–W
BR–W
G–W
BR
R–Y
V
L–Y
G–Y
Y
B–R
P–L
P
GR
G–R
G
Y–L
Y–G
L–Y
LG–R
Y–R
L
W
L–B
Y–B
P–B
W–B
R
L–R
R–Y
B
L–R
L–O
B
R–Y
L–R
R
W–B
P–B
L–B
Y–L
W
L
Y–G
LG–R
L–Y
Y–R
Y–L
BR
BR
BR
BR
BR
BR–W
BR
BR–W
BR–W
BR
BR–W
Y–G
BR
W
Y–L
P–B
W–B
R
BR–W
G–W
BR
R–Y
V
W–G
BR
G–Y
Y
B–R
P–L
P–B
P–B
BR
GR
BR
LG
R–L
R–L
B–Y
B–Y
R–L
B–Y
P–L
W
L–R
L–
W
BR
–
W
BR
BR
–
W
BR
–
W
GR
BR
G–
R
BR
L–
G
L–
G
W–B
W–B
W
–
B
R
L–R
BR
–
W
BR
L–W
BR
BR–W
11
12
13
14
3
5
1
2
2
4
5
6
7
8
9
3
4
4
2
1
6
1
1
W/V
MGC
IGN
RDFGR
ACC
+B
E
DIN
MDEF
LP
MFACE
TC
TPM
TW
TE
ST
TR
IG+
SET5
SET4
SET3
SET2
SET1
SAUTO
HR
S5
TP
SG
MC
MH
A/CIN
LCKIN
LV
BLR
DOUT
TAM
TPI
MREC
MFRS
4
5
23
8
17
8
7
3
2
16
15
14
13
12
4
9
18
22
20
3
2
7
11
9
10
25
5
8
8
1
2
3
3
2
1
9
9
5
18
8
6
10
6
8
10
1
9
13
5
9
6
7
1
15
10
15
1
4
3
12
7
11
7
Automatic Air Conditioner
3
1
6
5
13
3
3
5
5
1
2
6
19
IR2
10
DEF
FACE
A3
A/C
P
R
E
SS
U
R
E
S
W
V 4
VSV(for Water Valve)
A15
A/C CONTROL
SW AND
RADIO SW
To TDCL<2–4>
A 1
A/C AMBIENT
TEMP. SENSOR
A3
3
A
IR
INL
E
T
CO
NT
RO
L
S
E
R
V
O
M
OT
OR
To Engine and ECT ECU
<2–7>
From Igniter
<1–5>
From Defogger
Relay<15–3>
To TDCL<2–4>
From Rheostat<5–7><6–7>
A28
AIR VENT MODE
CONTROL SERVO
MOTOR
W 6
WATER TEMP. SENSOR
(for A/C System)
A16
A/C EVAPORATOR
TEMP. SENSOR
A20
A/C SOLAR SENSOR
A19
A/C ROOM TEMP. SENSOR
15A
CIG
10A
DOME
A1
2
,
A1
3
,
A1
4
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