Lexus SC300 / Lexus SC400. Manual — part 995
OVERALL ELECTRICAL WIRING DIAGRAM
1
2
34
18
LE
XU
S
S
C
300
1J
7
2
3
1J
5
1B
4
2
4
1C
6
4
AC
C
IG
1
ST
1
AM
1
2
4
7
9A
1
0
A
8B
S
1
10
19
2
2
2
5
23
1
8
1
2
11
24
6
1
394
1
0
5
41
6
5
612
4B
5A
1
2
A
5B
1
2B
8A
8
B
1B
6B
2B
7B
2A
7A
6
2
0
Bc
1
4
Bc
2
3
Bc
2
1
9
Bc
1
1
6
Bc
1
5
B
c
1
1
7
Bc
1
6
Bc
1
1
5
Bc
1
7
Bc
2
4
B
c
1
8
Bc
2
10
IP
1
1
IP
1
5B
T
1
6
B
T
1
11
A
6A
1A
11
B
19
B
T
1
20
B
T
1
1
8
Bc
1
4
BS1
81
5
1
4
3
1
7
EB
165
43
8
7
2
52
3A
W–L
W–L
W
B–Y
B–R
W
W
W –L
R
Y–B
B
Y
O
R
BR
GR–W
G
R –W
G
W
B
B
W–B
W –B
W
BR
W
L–R
W
W
L–R
R–L
R–L
L–O
L–Y
L–B
B–Y
B–R
L
LG
L
LG
V
V
LG
L
LG
L
B–R
B–Y
L–B
L–Y
L–O
L
R–B
BR
G –W
R–W
L–W
B–W
LG
L
15
A
EC
U
–
IG
15
A
TE
L
40
A
IG
S
W
G–B
R
60A
MA
IN
100A
AM
1
120A
ALT
BA
T
T
E
R
Y
F9
F
U
SE
BL
O
C
K
Fro
mR
adio
and
Play
er
(w/
C D
Pla
yer
)<
19–1
>
From
Ste
reo
Pow
er
Am
plif
ier
(w/
oCD
Pla
yer
)<
20–
1>
To
R ad
io
and
Play
er
<19
–1><
20–
3>
F1
2
F
R
ON
T
D
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R
SP
EA
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R
R
H
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M1
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C
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M
obil
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Telephone
(SH
IE
LD
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(SH
IELD
ED )
(SH
IE
LD
ED)
(SH
IELD
ED )
(SH
IE
LD
ED)
(SH
IELD
ED )
W
I1
5
IG
N
IT
IO
N
S
W
T1
6
A
,
T
1
7
B
2
3
5
7
8
9
10
12
4
11
1
6
5
4
3
2
1
67
89
1
0
11
12
AB
T
E
L
E
P
H
O
NE
T
RA
NS
CE
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R
A
N
D
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P
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T1
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T1
7
12
F
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s
ide
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f
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t
fend
er
10
9
BR
BR
BR
BR
–
W
BR
–
W
BR
–
W
BR
BR
BR
–
W
1
2
3
4
19 LEXUS SC300
4
ACC
IG1
ST1
AM1
3
2
3 BV1
2 BV2
1 BV2
6 IQ2
7 IQ2
4 BV2
3 BV2
10 BV2
9 BV2
6 BV1
5 BV1
4 BV1
10 IF2
1 IF2
2 IG2
1 IG2
11 Bc2
12 Bc2
10 BV1
11 IQ2
3 IQ1
7 BV2
2 BV1
19 BV1
7 BV1
18 BV1
3 IG2
1 Bc2
10 Bc1
9 Bc1
8 Bc1
23 Bc1
8 BV2
12 IQ2
24 Bc1
II
BM
1J
5
1J
8
2
1C
6
1E
10
2
1B
4
1J
7
AMP
E
MUTE
AMP
RU–
RU+
7 A
10 C
4 C
8 A
3 A
4 A
3 D
1 D
6 D
2 D
3 C
1 A
6
5 A
2 A
6 A
1 B
3 B
2 B
6 B
1 C
5 C
9 C
2 C
7
4
MUTE
AMP
RU–
RU+
RL–
RL+
RR–
RR+
FL–
FL+
FR–
FR+
TLMT
PWR
VOL+
VOLC
SGND
B
ACC
ANT
ANTA
ANTB
WP+
WP–
ACC
+B
E
ANTB
ANTA
ANT
ACC
B
IG
6
3
8
5
2
1
7
3
4
9
10
2
6
5
1
4
7
B
W
P–
L
R–
B
BR
R–
B
P–
L
W
B
Y
B
W
R
V
V
V
R
W
B
Y
B
W
P–
L
BR
BR
P–
L
W–
B
Y–
R
L–
W
P–
G
GR
L–Y
B–
R
R–
W
B–
W
GR
L–
Y
BR
L–Y
GR
L–
Y
GR
P–
G
L–
W
Y–
R
L–
Y
G–
R
L–
Y
GR
P–
G
L–
W
Y–
R
Y–R
L–W
P–
G
GR
L–
Y
L–
Y
W
P–
L
VV
G–
R
R–
L
R–
W
G–
Y
W
W–
L
W
LG
L
P
P
P
P
V
LG
L
W
BR
BR
B–
Y
P–
L
B–
Y
E
1
1
1
2
2
2
2
1
60
A
M
A
IN
10
0A
A
M
1
12
0A
A
L
T
40A
IGSW
I15
IGNITION SW
BATTERY
20A
RADIO No. 1
7. 5A
RADIO No. 2
RADIO AND PLAYER
F 9
FUSE BLOCK
A32
AUTO ANTENNA MOTOR AND RELAY
W10
WOOFER SPEAKER
AMPLIFIER
W 9
WOOFER
SPEAKER
R12
REAR
SPEAKER LH
R13
REAR
SPEAKER RH
F1
0
F
R
O
N
T
D
OOR
SP
EA
K
ER
L
H
15A
ECU–IG
T
o
T
el
ep
hon
e
T
rans
cei
v
er
an
d
S
pea
ker
R
el
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y
<
1
8–
7>
T
o
A
/C
C
ont
rol
S
w
a
nd
R
adi
o
S
w
<
22
–4>
T
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A
/C
C
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w
a
nd
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adi
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w
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22
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T
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T
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T
ra
ns
c
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ve
r
an
d
S
p
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er
R
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ay
<
1
8–
7>
Power
Source
Radio and Player(w/o CD Player)
Auto Antenna
2 IE1
L–
Y
(SH
IE
L
D
ED
)
P–
L
( SH
IEL
D
E
D
)
R 2
, R 3
, R 5
, R 6
C
D
A
B
1 2
5
3 4
6 7 8 9 10
1
2
3 4 5 6
1 2
3 4
5 6 7 8 9 10
1
2
3 4 5 6
C
D
A
B
R 2
R 3
R 5
R 6
RADIO AND PLAYER
L–Y
GR
3
4
Under the
ashtray RH
Back panel
center
8
7
BR
Y
B
OVERALL ELECTRICAL WIRING DIAGRAM
1
2
34
20
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
1B
4
5
BV3
4
BV
3
15
BV
3
14
BV3
13
BV3
12
BV
3
1
BV
3
8
BV
3
11
BV
3
10
BV
3
3
BV3
2
BV
3
16
BV
3
10
BV
1
11
IQ
2
2
IE
1
3
IG
2
2
2
74
3F
8F
9F
1
0F
1F
6F
1
1F
2F
7F
4
F
5F
1
2F
3
E
2
C
6
C
1
C
3
C
4
D
6
1
G
3
G
2G
6
G
1H
5H
8H
2H
6H
9H
4H
3H
3
IQ
1
7
BV
2
2
BV1
1
BV
1
19
BV1
7
BV
1
18
BV
1
1J
8
1E
10
7D
6D
1
5D
1
4D
5D
1
3D
1
2D
1
1
D
1E
5
E
1D
2E
8D
4E
1
0
E
3D
13
BV
1
12
BV1
16
BV
1
15
BV
1
11
BV1
14
BV
1
8
BV
1
17
BV1
6
BV
1
5
BV
1
4
BV
1
9
BV
1
3
BV
1
7H
B–
Y
GR
L–
Y
L–
W
B–
R
L–
G
Y–
R
R–
B
L–
B
P–
L
W
BR
B
G
Y
W
BR
L
R
L–
Y
W
P–L
B–Y
W
W –L
W
G–W
G –O
Y–R
Y–L
B
W
BR
L
R
Y–B
V–W
G–B
V
L–Y
L–Y
W
P–
L
L–Y
L–Y
G R
L–Y
L–Y
P–G
L–W
Y–R
GR
GR
L–Y
L–W
B–R
L–G
Y–R
G–Y
R–W
R –L
G –R
V
G –B
V–W
Y–B
R
L
BR
W
B
Y–L
Y–R
G –O
G–W
R
L
BR
W
Y
G
BR–B
BR
B
W
P–L
R –B
P–L
W
B
BR
G
Y
W
BR
L
R
L–B
R –B
GR
T
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Lu
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C
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W
<
6–3
>
From
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Trans
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ver
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peak
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Rel
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1>
To
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C on
tro
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Wan
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adi
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W
<2
2–4>
From
A/C
C on
trol
SW
and
R ad
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W
<2
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40
A
IG
S
W
I1
5
IG
N
IT
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N
S
W
R–
W
T
X
M
+
T
X
M
–
T
X
S
+
T
X
S
–
C
DR
+
CD
R–
S
G
N
D
CD
L
+
CD
L
–
G
ND
+
B
A
C
C
SW
T
X
M
+
T
X
M
–
T
X
S
+
T
X
S
–
C
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+
CD
R–
S
G
N
D
CD
L
+
CD
L
–
G
ND
+
B
BA
T
T
E
R
Y
60A
MA
IN
100A
AM
1
120A
ALT
F9
F
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SE
BL
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C
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RF
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M
U
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B
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A
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AC
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AC
C
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A
N
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7.
5A
R A
D IO
No.
2
20A
RA
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N o.
1
C
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PL
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P
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(SH
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)
(SH
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)
(SH
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LD
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(SH
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D E
D)
(SH
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(PIO
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)
( PIO
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7
8
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67
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3
4
5
6
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8
9
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34
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D
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P
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R2
R4
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3
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34
56
7
8
9
10
1
1
12
13
14
1
5
BR
BR
BR
BR
5
6
7
8
20 LEXUS SC300(Cont’ d)
2
MUTE
5
RU–
1
RU+
9
WF–
10
WF+
6
AMP
8
GND
3
B
4
ACC
7
E
6 BV2
5 BV2
2 IG2
1 IG2
11 BC2
12 BC2
10 IF2
1 IF2
6 IQ2
7 IQ2
1 B
FR+
2 B
FL+
5 B
FR–
6 B
FL–
3 B
RR+
4 B
RR–
8 B
RL+
9 B
RL–
6 A
AMP
11 A
SGND
10 A
GND
9 A
BEEP
3 A
MUTE
8 A
R¥L
7 A
R¥R
2 A
R¥L
1 A
F¥R
7 A
E
2
1
2
1
2
1
2
1
8 BV2
12 IQ2
II
23 Bc1
9 Bc1
8 Bc1
1 Bc2
10 Bc1
1J
5
1C
6
4
AMP
7
E
1
ANTB
2
ANTA
5
ANT
3
B
8
ACC
6
IG
24 Bc1
BM
B–Y
GR
L–Y
L–W
B–R
L–G
Y–R
R–B
L–B
P–L
W
B
BR
G
Y
W
BR
L
R
L–Y
R–B
P–L
P–L
BR
BR
P
V
P
V
P
V
P
V
LG
L
P
V
B
Y
Y–
R
L–
W
P–
G
L–
Y
GR
B–
R
GR
L–
Y
B–
R
L–
G
Y–
R
Y
B
W
R
P–
L
P–
L
W–
B
BR
BR
BR
BR
R
L
BR
W
Y
G
BR
P–
L
GR
L–
Y
L–W
L–
B
P–
L
L–
Y
GR
GR
B–
Y
T
o
T
el
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on
T
ra
n
sc
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ive
r
a
n
d
R
el
ay
<
18
–1
>
15A
ECU–IG
W
B
B–
W
R–
W
W 9
WOOFER
SPEAKER
W10 WOOFER SPEAKER
AMPLIFIER
STEREO POWER AMPLIFIER
R12
REAR
SPEAKER LH
R13
REAR
SPEAKER RH
F10
FRONT DOOR
SPEAKER LH
A32
AUTO ANTENNA MOTOR AND RELAY
Radio and Player(w/ CD Player)
Auto Antenna
(SH
IE
L
D
ED
)
(SH
IE
L
D
ED
)
(SH
IE
L
D
ED
)
(PIONEER)
(PIONEER)
P–
L
( NA
K
A
M
ICH
I)
(PI
O
N
EE
R
)
(PIO
N
EE
R
)
BR
–
B
S13
, S14
A
B
6
4
3
2
1
7 8 9 10 11 12
14
5
13
1 2
5
3 4
6 7 8 9 10
A
B
STEREO POWER
AMPLIFIER
S13
S14
P–
L
L–
B
Under the
ashtray RH
Back panel center
(PIONEER)
10 B
14 A
L–
Y
GR
+B
ACC
L–Y
GR
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