Lexus SC300 / Lexus SC400. Manual — part 1001
58
POWER SOURCE
HEADLIGHT RELAY (FOR USA)
1–2 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION OR DIMMER SW AT FLASH POSITION
HEADLIGHT RELAY (FOR CANADA)
1–2 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION OR DIMMER SW AT FLASH POSITION
: CLOSED WITH ENGINE RUNNING AND PARKING BRAKE PEDAL RELEASED (PARKING BRAKE SW OFF)
TAILLIGHT RELAY (FOR USA)
5–3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
TAILLIGHT RELAY (FOR CANADA)
5–3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
: CLOSED WITH ENGINE RUNNING AND PARKING BRAKE PEDAL RELEASED (PARKING BRAKE SW OFF)
IGNITION MAIN RELAY
2–1 : CLOSED WITH IGNITION KEY AT ON OR ST POSITION
I15
IGNITION SW
4–3 : CLOSED WITH IGNITION KEY AT ACC OR ON POSITION
4–2 : CLOSED WITH IGNITION KEY AT ON OR ST POSITION
11–6: CLOSED WITH IGNITION KEY AT ON OR ST POSITION
4–1 : CLOSED WITH IGNITION KEY AT ST POSITION
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
C23
I15
F 9
N 1
: RELAY BLOCKS
CODE
SEE PAGE
RELAY BLOCKS (RELAY BLOCK LOCATION)
2
ENGINE COMPARTMENT LEFT
4
LEFT KICK PANEL (J/B NO.1 LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B
ENGINE ROOM MAIN WIRE
1J
COWL WIRE
1K
COWL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EB1
ENGINE WIRE AND ENGINE ROOM MAIN WIRE (FRONT SIDE OF R/B NO. 2)
IE1
ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)
IJ1
ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IJ2
ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODE
SEE PAGE
GROUND POINTS LOCATION
IF
LEFT KICK PANEL
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
I 1
COWL WIRE
I24
ENGINE ROOM MAIN WIRE
I11
COWL WIRE
I33
ENGINE WIRE
SERVICE HINTS
122
POWER WINDOW
2
1H
10
1D
8
1J
1
1D
10
1D
9
1J
2
1B
5
1I
16
6
3
6
3
IF
IJ
IP1
20
IP1
15
B 4
8
3
1
1I
7
2
4
A
20
A
8
A
2
A
16
A
13
A
12
4
B
8
R
R
L–
W
B–
R
W–
B
W–
B
L
L
W–
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
DOOR
15A
ECU–IG
30A
POWER
KEY OFF POWER
CIRCUIT
POWER
MAIN
RELAY
D
OOR
O
P
E
N
DE
T
E
CT
IO
N
S
W
R
H
D
OOR
OP
E
N
DE
T
E
C
T
IO
N
S
W
L
H
THEFT DETERRENT
AND DOOR LOCK ECU
P
O
W
E
RW
IN
D
O
W
M
A
S
T
E
RA
N
D
DO
O
R
L
O
CK
C
O
NT
RO
L
S
W
L
H
D
OOR
L
OC
K
T 8
, T 9
B
A
1
2
1K
7
1K
13
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
D1
0
D1
1
P5
6
2
5
1
123
UP
DO
W
N
M
UP
DO
W
N
3
4
2
IP1
2
IP1
3
IP1
11
IF2
11
IF2
3
M
2
1
9
10
5
7
5
1
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
DO
W
N
AU
T
O
UP
LOCK
NORMAL
S
R
Q
1
2
PO
W
ER
W
IN
D
O
W
CO
N
T
RO
L
S
W
R
H
POWER WINDOW
MOTOR RH
POWER WINDOW
MOTOR LH
P 7
P 6
P4
P 5
–
+
–
+
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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