1991 LEXUS SC400 horn

50
POWER SOURCE (Current Flow Chart)*1: USA
*2: CANADA
P18
P11
N2 N4 O2 P2 O8 P4 P6 R5 R4 P20
P14
226
154
192
154
190 68 154 90
202
202
P8
P7
184 94
O5 P5 P3
Parking Brake SW
Power Window Motor RH Power Window Motor LHOil Pressure SW
Power Seat Control SW
(for Driver's Seat)
Power Seat Control SW
(for Passenger's Seat)Power Seat ECU (Passenger's)Oxygen Sensor Sub
(for California)Power Seat Motor (for Driver's
Lumbar Support Control)O/D Main SW
Radio and Player Personal LightRadio and Player (w/ CD Player)Noise Filter
(for A/C System)Power Seat Motor (for Passenger's
Reclining Control)PPS ECU
Power Window Control SW RH
Power Window Master SW and
Door Lock Control SW LH
*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
LocationP9 P12 P10 R2
Power Seat ECU (Driver's)Noise Filter
(for Defogger System)
216 126 216 208
122


* 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 o\
n the page indicated here.
[LOCATION](1): J/B No. 1 (See page 20)(2): R/B No. 2 (See page 19)(3): R/B No. 4 (See page 23)
20
19 22
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51
R5 R7S11
R11
R9 R17 R16 R18
R10 S3 S10 S13 S12
168
90
202
212
208
68
184
216
186 188
S14 T1 T6 S24
216
101 98 104 173
190
173 188
90
216 94 112
Radio and Player
(w/o CD Player)
Rheostat
S18
S17 S23
S15 S16
TDCLRear Turn Signal Light RH
[Rear Comb. Light RH] Back±Up Light LH
[Rear Comb. Light LH]
Stop Light LH
[Rear Comb. Light LH] Rear Turn Signal Light LH
[Rear Comb. Light LH]
Taillight LH
[Rear Comb. Light LH]
Back±Up Light RH
[Rear Comb. Light RH]
Stop Light RH
[Rear Comb. Light RH]
Taillight RH
[Rear Comb. Light RH]
Stop LightSeat Heater
(for Driver's Seat Back)Short Connector
Seat Heater SW (M/T) Remote Control Mirror LH Remote Control Mirror ECU
Speed Sensor No. 1
Shift Lock ECU
Stereo Power Amplifier
Theft Deterrent Horn Remote Control Mirror RH
Remote Control Mirror SW
Stop Light SWSeat Heater
(for Driver's Seat Cushion)
Seat Heater
(for Passenger's Seat Back)
Seat Heater
(for Passenger's Seat Cushion)
86 101 98 86 104 148
154
186
68
98
134
144 134
144
148
178
(4)
: R/B No. 5 (See page ) 22
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52
POWER SOURCE (Current Flow Chart)*1: USA
*2: CANADA
T9 T19T11 T12
T10 W5
V3 V5 V6 W3 W2
188
11 2
194
204 200
162 216
V4 200
112 90 134 68 156
192
226 94
VSV (for EVAP) Tension Reducer
Solenoid LHTheft
Deterrent and
Door Lock ECU
Tilt and power
Telescopic ECU
Seat Heater SW (A/T)
Traction Cut SWTrip SW and
Theft Deterrent Indicator
Telephone Transceiver and
Speaker Relay
Tension Reducer
Solenoid RHVSV
(for EGR)(EX. California)
Washer Level SW Vanity Light LH
Vanity Light RH
Washer Motor
Water Temp Sender
Wiper MotorVSV (
for Water Valve)
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
216
90
216
Traction ECU
Traction 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 o\
n the page indicated here.
[LOCATION](1): J/B No. 1 (See page 20)(2): R/B No. 2 (See page 19)(3): R/B No. 4 (See page 23)
20 19
22
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53
118 10422662
68
11 2
208
212
226 102
94
W7 W8 W10
Wireless Door Lock
Main SW
Wireless Door Lock ECU
Woofer Speaker Amplifier
Power Main Relay
A/C Magnetic Clutch Relay
EFI Main Relay
Heater Relay
Defogger Relay
Turn Signal Flasher
Horn Relay Diode
Cornering Light Relay Starter Relay
11 2
194 68
126 190
226
102
111
11 2
Diode
(4): R/B No. 5 (See page )
22
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57
87
65
43
21
10 9
12 11
14 13
21
22 21
20 19
18 17
16 15
2
2
2
2
2
2
2
2
2
2
2 2 22
2
2
2
2
2
22
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
WR
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
212
1 2
2
4
3
1
1
3 43
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
RE LA Y
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 I1W±B
B
(
M/T )
( A/T )
( CA NA DA )
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11 4
THEFT DETERRENT AND DOOR LOCK CONTROL
2
5
1K
71E 5
44 1I
71J 1
3 11 IE1
9
2
1
BM IF BL
BT1
8BT1 7IG1 2IJ1
4
IJ1
9
B
11
HORN B
4
SH B
8
PRLY A
8
+B 2
B
1 LUG
B
10 DS WL
A
9 IND
4
I72
12
1
4
3
3
15
10 1 2
BY1
8
IH FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
25A
HAZ±HORN 30A
POWER30A
DOOR
POWER
MAIN
RELAY
W
WW W
G±R
WW
B±O
B±O
Y±RW±B
L±W
L±W
L±R
L±R
W±B W±B G±B
R±W L±G
L±G
R±W G±B
R
BR W±B
TRIP S W AND
THEFT DETERRENT
INDICATOR LIGHT
COMB INATION
METER
FUEL L I D
OPENER SOLENOID
FUEL LI D
OPENER SW
THEFT
DETERRENT
HORN
HORN
RELAY
LUGGAGE COMPARTMENT
LIGHT SW LUGGAGE COMPARTMENT
KEYUNLOCKSW
THEFT DETERRENT AND DOOR LOCK ECU T8
,T9 T1
F1 0
F1 4
T1 5
C14
L6 L5
B
A
B
6
52
31
WhereEverybodyKnowsYourName

104
TURN SIGNAL AND HAZARD WARNING LIGHT
1E
7 2
1A
71A 41C 41C 31E19 1E14
2 3 2 3 1H
11 1H 7
1J 1 3G
3
3A 1
1E 18
1K 6 3D
10
4
4
4
4
4
IQ2
8
IQ1
10 IQ1
12 IQ1 11
IG2
9IG1 10 IG123
IQ2
13
I7 I7
B15
EB EA BM IF 55
9
756 4123 10 8
66
1
4
2
5
3
A
16 A 17
B
23
IG2
8
IQ2 3
IE19
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
HAZARD TURNRH
LH
OFF
ON 20A
TURN
25A
HAZ±HORN
TURN SIGNAL
FLASHER TURN SIGNAL SW [COMB. SW]
HA ZARD SW
FRONT TURN
SIGNAL LIGHT
REAR TURN SIGNAL LIGHT
[REAR COMB. LIGHT] TURN SIGNAL INDICATOR
LIGHT [COMB. METER]
LH RH RH
LH WW
R±W R±B
R±W
R±W W±R
R±B
G± Y
G± B
W±BW±B
W±B
W±B
G±R
G±R
W
W
W±R
W±B
W±R
R±WR±B
R±B
R±W
R±W
R±B
R±W
W±BR±B
G±Y
G±B
G±Y
G±B
G±Y
G±Y G±B
W±B W±B
W±B W±B W±B W±B
W±B 5
R±B
H7
C16
F7 F8 R10 R11
C13 , C 1 4AB
LH RH
6
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