Lexus SC300 / Lexus SC400. Service manual — part 1000
52
POWER SOURCE (Current Flow Chart)
*1: USA
*2: CANADA
T9
T19
T11
T12
T10
W5
V3
V5
V6
W3
W2
V4
VSV (for EV
A
P
)
T
ension Reducer
Solenoid LH
Theft
Deterrent and
Door Lock ECU
T
ilt and power
T
elescopic ECU
Seat Heater SW (A/T)
T
raction Cut SW
T
ri
p
SW and
Theft Deterrent Indicator
T
elephone T
ransceiver
and
Speaker Relay
T
ension Reducer
Solenoid RH
VSV
(for EGR)(EX. California)
W
asher Level SW
V
anity Light LH
V
anity Light RH
W
asher Motor
W
ater T
emp Sender
Wiper Motor
VSV (
for W
ater V
alve)
VSV (
for Fuel Pressure Up)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or Fuse
50A
DEFOG
30A
DOOR
30A
POWER
15A
STOP
15A
ECU–B
10A
MIR–HTR
10A
HEATER
20A
TURN
20A
WIPER
10A
GAUGE
15A
ECU–IG
7.5A
ENGINE
7.5A
IGN
15A
CIG
7.5A
RADIO No.2
15A
TAIL
7.5A
PANEL
7.5A
ST
15A
TEL
10A
DOME
20A
RADIO No.1
25A
HAZ–HORN
30A
EFI
7.5A
ALT SENCING
15A
HEAD LH*1
15A
HEAD RH*1
15A
HEAD LH–LWR*2
15A
HEAD RH–LWR*2
15A
HEAD LH–UPR
15A
HEAD RH–UPR
60A
HEATER
7.5A
TRAC
15A
SEAT–HTR
Location
T
raction ECU
T
raction ECU
W1
V1
V2
T18
T16
T15
T14
T13
T8
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.
[LOCATION]
(1)
: J/B No. 1 (See page
)
(2)
)
(3)
)
53
W7 W8 W10
Wireless
Door Lock
Main SW
Wireless Door Lock ECU
W
oofer Speaker Amplifier
Power Main Relay
A/C Magnetic Clutch Relay
EFI Main Relay
Heater Relay
Defogger Relay
T
urn Signal Flasher
Horn Relay
Diode
Cornering Light Relay
Starter Relay
Diode
(4)
: R/B No. 5 (See page )
56
POWER SOURCE
AM
2
AM
1
AC
C
IG
1
IG
2
3
2
1
6
4
11
ST
1
1B
2
1J
5
1J
6
1J
3
1J
8
1K
13
1K
4
1J
4
1B
4
1J
7
I24
I33
I11
P
N
2
3
IE1
16
IJ1
6
3
4
2
13
14
5
9
7
11
6
W
W
B
B
B
B–R
B–W
B–W
W–L
B
B–O
P–L
B
B
B
W–
L
R
W–
R
W–
R
B
W–
R
Y
W–
L
W–
R
W
W–
R
B–
Y
B–
W
P–
L
B–
O
B–
W
B–
W
B–
W
B–
W
W
B–R
15A ECU–B
15A STOP
30A POWER
30A DOOR
TAILLIGHT
RELAY
15A TAIL
7. 5A PANEL
BATTERY
15A ECU–IG
7. 5A ENGINE
20A WIPER
10A GAUGE
20A TURN
10A HEATER
7. 5A ST
7. 5A IGN
15A CIG
7. 5A RADIO NO. 2
40A
IGSW
NEUTRAL
START SW
T
O
EN
G
IN
E
AN
D
EC
T
E
C
U
TO CRUISE CONTROL ECU
T
O
ABS
A
C
T
U
AT
O
R
R
EL
A
Y,
A
B
S
M
OT
OR
R
E
L
A
Y
A
N
D
T
R
AC
T
IO
N
BR
A
KE
AC
T
U
A
T
O
R
R
E
L
AY
T
O
A
L
TE
R
N
A
TO
R
”
B
”
IG
NIT
IO
N
S
W
FUSE BLOCK
TO TRACTION MOTOR RELAY
10
0A
A
M
1
60
A
A
B
S
N
O
.
1
30
A
IN
J
12
0A
A
LT
30A
A
M
2
30
A
A
B
S
N
O
.
2
60A
MA
IN
F 9
N 1
I1
5
5
1
3
2
2
6
3
4
1
5
1
2
IJ2
8
B
B–
W
B
B
(M/T)
(M/T
)
C2
3
CL
UT
CH
S
T
A
R
T
S
W
(A/
T
)
57
8
7
6
5
4
3
2
1
10
9
12
11
14
13
2
1
22
21
20
19
18
17
16
15
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
IF
4
1B
1
4
4
2
2
4
4
EB1
3
W
B
B
B
B–R
R–L
B
B
L–O
R–Y
L–R
W
R
B–Y
W
L–Y
W–L
R
R
R
R–G
R–B
R–W
B
R–Y
B
B
B–R
2
B
W–
B
B
R
1
2
1
2
1
2
2
4
3
1
1
3
4
3
1
3
5
2
2
4
4
3
5
3
4
20A RADIO NO. 1
25A HAZ–HORN
30A EFI
10A DOME
15A TEL
7. 5A ALT SENCING
7. 5A TRAC
HEADLIGHT
RELAY
STARTER
RELAY
60A HEATER
50A DEFOGGER
DEFOGGER
RELAY
15A SEAT–HTR
15A HEAD (LH–UPR)
15A HEAD (RH–UPR)
15A HEAD (LH) (FOR USA)
15A HEAD (LH–LWR) (FOR CANADA)
15A HEAD (RH) (FOR USA)
15A HEAD (RH–LWR) (FOR CANADA)
DIMMER
RELAY
SEAT HEATER
RELAY
10A MIR–HTR
W–B
I 1
W–B
B
(M/
T
)
(A/
T
)
(CA
NA
DA
)
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