1991 LEXUS SC300 window

OVERALL ELECTRICAL WIRING DIAGRAM
1234
14 LEXUS SC300
1J
41J 7 1J
5
2
44
11
1B
4
441K
13 4 1A
52
22
3 1
4
2
3
2
4
1
5 22
13 IE1
2Bb1
10 IG2
16 IG1
3232
4
ACC
IG1
ST1
AM1 3
2
2 1
IF BL Bk EB
4Bb1
3H
14
1E
18 3A
1 11
3232 1B
1
1J
8
3A
5
1D
11H 4
1C
7 1E
2
3F
5
4IP2
10 Bc 2
20 IP1 4
1
2 2
IJ
BL
B
B
W± B
W
W± LB
WB
B
B
B±R
B
B
W± B
W± B
W± B
W±B
W± B
G
L
R± Y R± Y B
R± Y
W± B
W±B W±B W±B W±B
W± B L
G
GL
R±L
L±R B
L±R
L±R B
W± B
W± B W± B
W± B
W±B
W± B
L±R P±L
L±R B B
P±L
B± Y
B±Y
120A ALT 100A AM1F9
FUSE BOX4
3
I15
IGNITION SW
40A
IGSW 15A
ECU±I G
15A
SEAT±HTR
SEAT HEATAER SW
S18
SEAT HEATER RH
( f or Driver' s Seat Cushion )
S16
SEAT HEATER LH
( f or Pas senger ' s Seat Cus hion )SEAT HEATER
RELAY
W Y
W Y
W± B
To A/C Con tro l
Assembly< 22±7>
BATTERY
S1 7
SEAT HEAT ER RH
( for Driver' s
Se at Bac k )
S1 5
SEAT HEAT ER LH
( for Passenger' s
Se at Bac k )
DEFOGGER
RELAY
10A
HT R
50A
DEFOGGER 10A
MI R± HT R
4 3
LH
RH
MIRROR HEATER
[ REMOTE CONTROL MIRROR]
C22
CHOKE COI L
RE AR WI NDOW
DE FOGGE R
C11
CIGARETTE
LIGHTER
15A
CI G
N2
NOI SE
FILTER
( for Def ogger Syst em )
Power
Source Seat Heater
Rear Window Defogger and
Mirror HeaterCigarette
Lighter
6 54
Lef t kick panel Under t he center pillar
RHUnd er t he
center pillar
LHFr ont s ide of
left fender
Under the
center
pillar RHRight k ic k panel
2
1
1
1J 10
1D 8
3F 2Ba2
Ba1
14
5Ba2 Ba1
12 *
1
* 2
* 1
* 2
3 BY1 2 BU1
5B 7A
10 A 3 A3B 4B
1
B
8
A (
A/ T )
( M/ T )
(
A/T )
( M/T )
*2: (
w/ o Memory Power Seat )
*
1:
(
w/ Me mo r y P ower S ea t )
L
G
W±B (
* 3
)
8E 8E
5F
(
* 4
)
5F 4F 7E
( * 4)
4F
(
* 3)
7E (
* 3)
( * 4)
( * 3
)
( * 4
)
*
3: (
w/ Me mor y )
* 4: (
w/ o Memo r y )
9876 4321 5 54 21
3
E
R16, R17 F
R1 6, R17
MI RROR HE A TER
[ R EMOT E C ON RT OL MI RR OR ] MIRROR HEATER
[REMOTE CONRTOL
MIRROR]
123456
12 34
5 6 10 11 789B
(
A/T )
S24
A
(
M/T )
T12
S2 4 B , T1 2 A
SEAT HEATAER SW
1C
1D
R14 C , R15 D
(* 3) (
* 4 )
L
B
1
1
C
R14 D
R15
REAR WI NDOW DEFOGGER
R17
R1 6 E F
EF
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244
Rear Window Defogger
and Mirror Heater
Remote Control Mirror
Seat Heater
Shift Lock
SRS AIRBAG
Starting
Taillight and
Stop Light
Theft Deterrent and
Door Lock Control
Turn Signal and Hazard
Warning Light
Wiper and Washer
Wireless Door Lock
Remote Control
Horn
Ignition
Illumination
Interior Light
Liquid Crystal Inner
Rear View Mirror
Moon Roof
Power Seat
(Driver's)
Power Source
Power Window
PPS (Progressive
Power Steering
Radio and Player
ABS and
Traction Control
Automatic
Air Conditioner
Auto Antenna
Back±Up Light
Cellular Mobile
Telephone
Charging
Cigarette Lighter
Combination Meter
Cruise Control
Headlight and Light Auto
Turn Off (for USA)
Headlight
(for Canada) ECT and
A/T Indicator
4±2 16±2 7±2
3±2 21±2 3±8
14±4
18±2 19±4 (w/o CD Player)
20±8 (w/ CD Player)9±2 8±2
4±7 (for USA)
5±7 (for Canada)11±2
12±311±5 (w/ Driving
Position Memory)11±7 12±1 1±5 13±2
6±2 15±2 14±2
13±2
17±7 7±3 17±2 15±3
1±315±2
Power Tilt and
Power Telescopic12±2
Power Seat (Passengerºs
and Electric Tension Header
5±2 2±2
Cornering Light ABS (Anti±Lock
Brake System)
22±2
Engine Control Unlock and Seat
Belt Warning
1±2
23±2 (w/o Driving
Position Memory)
1 23±119±2 (w/o CD Player
20±2 (w/ CD Player
14±310±2 (w/ Memory)
5±7 (w/o Memory)
4±3 (for USA)
5±3 (for Canada) 4±5 (for USA)
5±5 (for Canada)
OVERALL ELECTRICAL WIRING DIAGRAM
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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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122
POWER WINDOW
2
1H
10
1D
8 1J
11D 10 1D 91J 2
1B
5
1I
16
6 3 6
3
IF IJ IP1
20 IP1
15
B4 8
31
1I
7
24
A
20 A 8A2
A
16 A 13 A12 4
B 8
R
R
L±WB±R
W±B
W±B L
LW±B
R±B
R±W
W±B
W±B
W±B
W±B R±W
R±W
W±B
W±B
W±B
L
R±W
R±W
L
W±B W±B Y±R
10A
DOME
30A
DOOR15A
ECU±IG 30A
POWER
KEY OFF POWER
CIRCUIT POWER
MAIN
RELAY
DOOR OPEN
DE TE CTION SW RHDOOR OPEN
DE TECTION S W LH
THEFT DETERRENT
AND DOOR LOCK ECU
POWERWINDOWMASTERAND
DOOR LOCK CONTROL SW LH
DOOR LOCK
T8 ,T9
B A
1 2
1K
71K 13
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
D10
D11
P5
62
51
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123
UP
DOWN
M
UP
DOWN
3
42 IP1
2
IP1
3
IP1
11 IF2
11 IF2 3
M
21
910 5 7
51
R±L
G±W
R±L
G±W
G±Y
R
R
G±Y R±L
G±W L L
L L
POWER WINDOW MASTER AND
DOOR LOCK CONTROL SW LH
DRIVER' S PASSENGER' S
LH RH
DOWNAUTO UP
LOCK
NORMAL
S
R
Q
12
POWER WINDOW
CONTROL SW RH
POWER WINDOW
MOTOR RH
POWER WINDOW
MOTOR LH P7
P6
P4
P5
±
+
±
+
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124
POWER WINDOW
WITH THE IGNITION SW TURNED ON, CURRENT FLOWS THROUGH THE ECU±IG FUSE " TERMINAL (A)2 OF THE THEFT
DETERRENT ECU " (B)8 " TERMINAL 2 OF THE POWER MAIN RELAY " TERMINAL 3 " TO GROUND, THIS ACTIVATES THE RELAY
AND THE CURRENT FLOWING TO TERMINAL 4 OF THE RELAY FROM POWER FUSE FLOWS TO TERMINAL 1 OF THE RELAY "
TERMINAL 4 OF THE POWER WINDOW MASTER SW, TERMINAL 3 OF THE POWER WINDOW SW.
1. MANUAL OPERATION (DRIVER'S WINDOW)
WITH THE IGNITION SW TURNED ON AND WITH THE POWER WINDOW MASTER SW (DRIVER'S) IN UP POSITION, THE CURRENT
FLOWING TO TERMINAL 4 OF THE POWER WINDOW MASTER SW FLOWS TO TERMINAL 10 OF THE MASTER SW " TERMINAL 1 OF
THE POWER WINDOW MOTOR " TERMINAL 2 " TERMINAL 9 OF THE MASTER SW " TERMINAL 8 " TO GROUND AND CAUSES
THE POWER WINDOW MOTOR TO ROTATE IN THE UP DIRECTION. THE WINDOW ASCENDS ONLY WHILE THE SW IS BEING PUSHED.
IN DOWN OPERATION, THE FLOW OF CURRENT FROM TERMINAL 4 OF THE POWER WINDOW MASTER SW TO TERMINAL 9 OF THE
MASTER SW CAUSES THE FLOW OF CURRENT FROM TERMINAL 2 OF THE MOTOR " TERMINAL 1 " TERMINAL 10 OF THE
MASTER SW " TERMINAL 8 " TO GROUND, FLOWING IN THE OPPOSITE DIRECTION TO MANUAL UP OPERATION AND CAUSING
THE MOTOR TO ROTATE IN REVERSE, LOWERING THE WINDOW.
2. DRIVER'S WINDOW AUTO DOWN OPERATION
WHEN THE DRIVER'S WINDOW SW IS PUSHED STRONGLY ON THE DOWN SIDE, THE CURRENT FLOWING TO TERMINAL 4 OF THE
POWER WINDOW MASTER SW FLOWS TO THE DOWN CONTACT POINT AND AUTO DOWN CONTACT POINT OF THE DRIVER'S SW.
THIS ACTIVATES THE RELAY (DOWN SIDE) INSIDE THE POWER WINDOW MASTER SW AND THE HOLD CIRCUIT ALSO TURNS ON AT
THE SAME TIME, SO THE RELAY (DOWN SIDE) REMAINS ACTIVATED EVEN WHEN THE SW IS RELEASED.
CURRENT FLOWS AT THIS TIME FROM TERMINAL 4 OF THE POWER WINDOW MASTER SW " TERMINAL 9 " TERMINAL 2 OF
POWER WINDOW MOTOR " MOTOR " TERMINAL 1 " TERMINAL 10 OF POWER WINDOW MASTER SW " TERMINAL 8 " GROUND,
SO THE MOTOR CONTINUES TO OPERATE UNTIL THE DRIVER'S WINDOW IS FULLY DOWN.
WHEN THE DRIVER'S WINDOW FINISHES DOWN OPERATION THE HOLD CIRCUIT GOES OFF, SO THE RELAY (DOWN SIDE) ALSO
TURNS OFF. THIS STOPS THE CURRENT FLOW FROM TERMINAL 4 OF THE POWER WINDOW MASTER SW TO TERMINAL 9, SO THE
POWER WINDOW MOTOR STOPS AND AUTO DOWN OPERATION STOPS.
WHEN THE DRIVER'S SW IS PULLED ON THE UP SIDE DURING AUTO DOWN OPERATION, THE HOLD CIRCUIT IS TURNED OFF SO
CURRENT FLOW FROM TERMINAL 4 OF THE POWER WINDOW MASTER SW TO TERMINAL 9 IS CUT OFF AND THE POWER WINDOW
MOTOR STOPS. IF THE SW REMAINS PULLED UP THE RELAY (UP SIDE) IS ACTIVATED, SO CURRENT FLOWS FROM TERMINAL 4 OF
THE POWER WINDOW MASTER SW " TERMINAL 10 " TERMINAL 1 OF POWER WINDOW MOTOR " MOTOR " TERMINAL 2 "
TERMINAL 9 " TERMINAL 8 " GROUND, THE POWER WINDOW MOTOR ROTATES IN THE UP DIRECTION AND MANUAL UP
OPERATION OCCURS WHILE THE SWITCH IS PULLED UP.
3. MANUAL OPERATION BY POWER WINDOW SW (PASSENGER'S WINDOW)
WITH POWER WINDOW SW (PASSENGER'S) PULLED TO THE UP SIDE, CURRENT FLOWING FROM TERMINAL 3 OF THE POWER
WINDOW CONTROL SW FLOWS TO TERMINAL 5 OF THE POWER WINDOW SW " TERMINAL 1 OF THE POWER WINDOW MOTOR "
TERMINAL 2 " TERMINAL 1 OF THE POWER WINDOW SW " TERMINAL 2 " TERMINAL 7 OF THE MASTER SW " TERMINAL 8 " TO
GROUND AND CAUSES THE POWER WINDOW MOTOR (PASSENGER'S) TO ROTATE IN THE UP DIRECTION. UP OPERATION
CONTINUES ONLY WHILE THE POWER WINDOW SW IS PULLED TO THE UP SIDE. WHEN THE WINDOW DESCENDS, THE CURRENT
FLOWING TO THE MOTOR FLOWS IN THE OPPOSITE DIRECTION, FROM TERMINAL 2 TO TERMINAL 1, AND THE MOTOR ROTATES IN
REVERSE. WHEN THE WINDOW LOCK SW IS PUSHED TO THE LOCK SIDE, THE GROUND CIRCUIT TO THE PASSENGER'S WINDOW
BECOMES OPEN.
AS A RESULT, EVEN IF OPEN/CLOSE OPERATION OF THE PASSENGER'S WINDOW IS TRIED, THE CURRENT FROM TERMINAL 8 OF
THE POWER WINDOW MASTER SW IS NOT GROUNDED AND THE MOTOR DOES NOT ROTATE, SO THE PASSENGER'S WINDOW CAN
NOT BE OPERATED AND WINDOW LOCK OCCURS.
4. KEY OFF POWER WINDOW OPERATION
WITH THE IGNITION SW TURNED FROM ON TO OFF, THE THEFT DETERRENT ECU OPERATES AND CURRENT FLOWS FROM DOOR
FUSE TO TERMINAL (A)8 OF THE ECU OR DOME FUSE TO TERMINAL (A)20 OF THE ECU " TERMINAL (B)8 " TERMINAL 2 OF
POWER MAIN RELAY " TERMINAL 3 " TO GROUND FOR ABOUT 60 SECONDS. THE SAME AS NORMAL OPERATION, THE CURRENT
FLOWS FROM POWER FUSE " TERMINAL 4 OF THE POWER MAIN RELAY " TERMINAL 1 " TERMINAL 4 OF THE POWER WINDOW
MASTER SW AND TERMINAL 5 OF THE POWER WINDOW SW. AS A RESULT, FOR ABOUT 60 SECONDS AFTER THE IGNITION SW IS
TURNED OFF, THE FUNCTIONING OF THIS RELAY MAKES IT POSSIBLE TO RAISE AND LOWER THE POWER WINDOW. ALSO, BY
OPENING THE FRONT DOOR (DOOR DETECT SW ON) WITHIN ABOUT 60 SECONDS AFTER TURNING THE IGNITION SW TO OFF, A
SIGNAL IS INPUT TO TERMINALS (A)12 OR (A)13 OF THEFT DETERRENT ECU. AS A RESULT, THE ECU TURNS OFF AND UP AND
DOWN MOVEMENT OF THE POWER WINDOW STOPS.
SYSTEM OUTLINE
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125
P 5 POWER WINDOW MASTER AND DOOR LOCK CONTROL SW LH
4±GROUND: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
8±GROUND: ALWAYS CONTINUITY
10±GROUND: APPROX. 12 VOLTS WITH IGNITION SW ON AND MASTER SW (DRIVER'S WINDOW) AT UP POSITION
9±GROUND: APPROX. 12 VOLTS WITH IGNITION SW ON AND MASTER SW (DRIVER'S WINDOW) AT DOWN OR AUTO DOWN
POSITION
WINDOW LOCK SW
OPEN WITH WINDOW LOCK SW AT LOCK POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
D1029P 529T 8B29
D1129P 629T 9A29
P 429P 729
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
219ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE
1D20FRONT DOOR LH WIRE
1H
1I20COWL WIRE1J20COWL WIRE
1K
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IF236FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IP138FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IF36LEFT KICK PANEL
IJ36RIGHT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
B 440FRONT DOOR LH WIRE
SERVICE HINTS
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192
REAR WINDOW DEFOGGER AND MIRROR HEATER
1B
11C 71D 11H 4
3A
1
1J
1
22
2
1A
5
3G
3
1D
10
22
1E18
IE1
13
IQ1
13
IP1
20
IG1
16 IP1
4
Bc2
10
BL IF IJ
E9
A
10
B
7 2
34
1
12
W±B
BB
B
R±L
R±Y
R±Y
R±Y
R±Y
W±B
W±B L±R B
B
L±R
L±R
B
W±B W±B
W±B
W±B
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
10A
HTR 50A
DEFOGGER 10A
MIR±HTR
DEFOGGER
RE LA Y
REA R
WINDOW
DEFOGGER CHOKE
COILMIRROR
HEATER LH
MIRROR
HEATER RH
RDFGR GND
IQ1
10
W±B
DEFOGGER SW
[A/C CONTROLASSEMBLY]
A12 , A 1 3
C22
R16 R17
B
A
43
2 1EB
B
4 A
7
B
4 A
7
A
8
B
5 A
8
B
5 (
W/ MEMORY )
( W/O MEMORY )
( W/ MEMORY )
( W/O MEMORY )
B
W±B
NOISE FILTERN2
A
1
B
1
BL
R14 , R15 A
B
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