Lexus SC300 / Lexus SC400. Manual — part 1004
157
2
1
1
2
1
4
2
3
5
6
2
1
3
4
1
12
15
13
10
2
11
3
8
6
5
16
7
17
1
3
2
BX1
4
BX1
17
Bb1
6
Bb1
5
B29
B30
B29
B29
M
1
2
M
2
1
BL
Bb1
4
+B
SLDF
SLDR
GND
SLD+
SLD–
L–W
W–B
BR
BR
BR
BR
BR
R
L–W
W–
B
W–
B
W
–
B
Y–
R
Y–
B
L–W
L–W
L–W
R
BR
B–
Y
BR
LG
–
R
Y
V–
W
LG
V
L–
Y
L–R
W–
B
L
L–
B
R
L–W
BR
SYSB
PBCL
SGND
RRSW
PFSW
SLSW
SSRS
PVCC
B
UCK
L
E
S
W
RH
RE
CLIN
ING
L
IM
IT
SW
S
L
ID
E
L
IM
IT
SW
S
L
IDE
P
O
S
IT
IO
N
S
E
N
S
O
R
(F
O
R
P
AS
SE
N
G
ER
’
S
SE
AT
)
POWER SEAT ECU (FOR PASSENGER’ S SEAT)
POWER SEAT CONTROL SW
(FOR PASSENGER’ S SEAT)
POWER SEAT MOTOR
(FOR PASSENGER’ S
SEAT RECLINING
CONTROL)
POWER SEAT MOTOR
(FOR PASSENGER’ S
SEAT SLIDE CONTROL)
P12
B5
R2
0
S1
9
S2
1
P 9
P18
P19
158
POWER SEAT (w/ DRIVING POSITION MEMORY)
CURRENT IS ALWAYS APPLIED FROM THE DOME FUSE TO TERMINAL SYSB OF THE POWER SEAT ECU, FROM DOOR FUSE TO
TERMINAL +B OF THE POWER SEAT ECU AND FROM STOP FUSE TO TERMINAL 2 OF THE STOP LIGHT SW.
WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS FROM ECU–IG FUSE TO TERMINAL IG OF THE POWER SEAT ECU AND
FROM THE GAUGE FUSE TO TERMINAL 9 OF A/T INDICATOR SW.
POWER SEAT OPERATION (FOR DRIVER’S SEAT)
CURRENT IS ALWAYS APPLIED TO TERMINAL SYSB AND TERMINAL +B OF POWER SEAT ECU SO THAT THE POWER SEAT ECU IS
ALWAYS READY TO OPERATE.
WHEN THE POWER SEAT CONTROL SW IS PUSHED TO THE “FRONT SIDE POSITION” SIDE, A SIGNAL IS INPUT INTO TERMINAL
SLDF OF POWER SEAT ECU, THE ECU OPERATES AND THE CURRENT TO TERMINAL +B OF POWER SEAT ECU FLOWS FROM
TERMINAL SLD+ OF POWER SEAT ECU
→
TERMINAL 2 OF POWER SEAT MOTOR (FOR DRIVER’S SEAT SLIDE CONTROL)
→
MOTOR
TERMINAL 1
→
TERMINAL SLD– OF POWER SEAT ECU
→
TERMINAL GND
→
GROUND, ROTATING THE POWER SEAT MOTOR SO
THAT THE SEAT SLIDES FORWARD WHILE THE POWER SEAT CONTROL SW IS BEING PRESSED.
TO SIDE THE DRIVER’S SEAT TO THE REAR, PUSHING THE POWER CONTROL SW TO THE “REAR SLIDE POSITION” SIDE, INPUTS A
SIGNAL TO TERMINAL SLDR OF POWER SEAT ECU. THIS CAUSES THE CURRENT FLOWING FROM THE ECU TO THE MOTOR TO
FLOW FROM TERMINAL SLD– OF POWER SEAT ECU
→
TERMINAL 2 OF POWER SEAT MOTOR (FOR DRIVER’S SEAT SLIDE
CONTROL)
→
MOTOR
→
TERMINAL 1
→
TERMINAL SLD+ OF POWER SEAT ECU, FLOWING THE REVERSE TO FRONT SLIDE
OPERATION AND CAUSING THE MOTOR TO ROTATE IN REVERSE, SO THAT THE DRIVER’S SEAT MOVES TO THE REAR.
THE MOVEMENT TO OTHER POSITIONS OCCURS SIMILARLY, SO ONLY THE FLOW OF CURRENT TO EACH MOTOR IS SHOWN:
FRONT VERTICAL CONTROL ’UP’ OPERATION
TERMINAL +B OF POWER SEAT ECU
→
TERMINAL FRV+
→
TERMINAL 2 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 1
→
TERMINAL FRV– OF ECU
→
TERMINAL GND
→
GROUND.
FRONT VERTICAL CONTROL ’DOWN’ OPERATION
TERMINAL +B OF POWER SEAT ECU
→
TERMINAL FRV–
→
TERMINAL 1 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 2
→
TERMINAL FRV+ OF ECU
→
TERMINAL GND
→
GROUND.
REAR VERTICAL CONTROL ’UP’ OPERATION
TERMINAL +B OF POWER SEAT ECU
→
TERMINAL RRV+
→
TERMINAL 2 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 1
→
TERMINAL RRV– OF ECU
→
TERMINAL GND
→
GROUND.
REAR VERTICAL CONTROL ’DOWN’ OPERATION
TERMINAL +B OF POWER SEAT ECU
→
TERMINAL RRV–
→
TERMINAL 1 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 2
→
TERMINAL RRV+ OF ECU
→
TERMINAL GND
→
GROUND.
LUMBAR SUPPORT CONTROL ’FRONT’ OPERATION
TERMINAL 7 OF POWER SEAT CONTROL SW
→
TERMINAL 4 OF LUMBAR SUPPORT SW
→
TERMINAL 1
→
TERMINAL 11 OF POWER
SEAT CONTROL SW
→
TERMINAL 1 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 2
→
TERMINAL 10 OF POWER SEAT
CONTROL SW
→
TERMINAL 2 OF LUMBAR SUPPORT SW
→
TERMINAL 3
→
TERMINAL 12 OF POWER SEAT CONTROL SW
→
GROUND.
LUMBAR SUPPORT CONTROL ’REAR’ OPERATION
TERMINAL 7 OF POWER SEAT CONTROL SW
→
TERMINAL 4 OF LUMBAR SUPPORT SW
→
TERMINAL 2
→
TERMINAL 10 OF POWER
SEAT CONTROL SW
→
TERMINAL 2 OF POWER SEAT MOTOR
→
MOTOR
→
TERMINAL 1
→
TERMINAL 11 OF POWER SEAT
CONTROL SW
→
TERMINAL 1 OF LUMBAR SUPPORT SW
→
TERMINAL 3
→
TERMINAL 12 OF POWER SEAT CONTROL SW
→
GROUND.
THE NUMBER OF TURNS OF EACH MOTOR (AMOUNT OF MOVEMENT OF EACH PART OF THE SEAT) IS DETECTED BY THE POSITION
SENSORS AND INPUT TO THE ECU, MAKING IT POSSIBLE TO PERFORM MEMORY AND RETURN FUNCTIONS FOR THE SEAT
POSITION USING THE DRIVING POSITION MEMORY AND RETURN SWITCH.
POWER WALK–IN OPERATION (FOR PASSENGER’S SEAT)
WALK–IN OPERATION
WHEN THE WALK–IN PEDAL IS DEPRESSED OR THE RECLINING HANDLE IS LIFTED UP, THE SEAT BACK RECLINES FULLY
FORWARD AND RECLINING LIMIT SWITCH NO. 2 OPERATES, SO A SIGNAL IS INPUT TO TERMINAL RFSW OF THE POWER SEAT ECU
→
TERMINAL SLD+
→
TERMINAL 1 OF THE POWER SEAT MOTOR (FOR PASSENGER’S SEAT SLIDE CONTROL)
→
MOTOR
→
TERMINAL 2
→
TERMINAL SLD– OF THE ECU
→
TERMINAL GND
→
GROUND. THIS CAUSES THE SEAT TO SLIDE FORWARD 100 MM
IN THE WALK–IN MODE. HOWEVER, WHEN THE INITIAL SLIDE POSITION IS 100 MM OR LESS FROM THE MOST FORE POSITION, THE
SEAT CAN ONLY SLIDE FORWARD AS FAR AS THE MOST FORE POSITION.
SYSTEM OUTLINE
159
RETURN OPERATION
WHEN THE SEAT BACK IS RAISED UP FROM THE WALK–IN POSITION AND RETURNED TO THE UPRIGHT LOCK POSITION,
RECLINING LIMIT SWITCH NO. 1 OPERATES AND A SIGNAL IS INPUT TO TERMINAL RRSW OF THE POWER SEAT ECU
→
TERMINAL
SLD–
→
TERMINAL 2 OF POWER SEAT MOTOR (FOR PASSENGER’S SEAT SLIDE CONTROL)
→
MOTOR
→
TERMINAL 1
→
TERMINAL
SLD+ OF ECU
→
TERMINAL GND
→
GROUND. THIS CAUSES THE SEAT TO SLIDE BACK TO A POSITION 120 MM FROM THE MOST
REAR POSITION, COMPLETING RETURN OPERATION. HOWEVER, IF THE SEAT IS POSITIONED WITHIN 120 MM OF THE MOST REAR
POSITION, RETURN OPERATION DOES NOT OCCUR, THUS MAINTAINING SUFFICIENT SPACE FOR THE REAR SEAT PASSENGER.
D10
DOOR LOCK MOTOR, DOOR UNLOCK DETECTION SW AND DOOR OPEN DETECTION SW LH
3–6 : CLOSED WITH FRONT LH DOOR OPEN
N 1
A/T INDICATOR SW [NEUTRAL START SW]
9–1 : CLOSED WITH SHIFT LEVER AT “P” POSITION
P10
(A)
, P11
(B) POWER SEAT ECU (FOR DRIVER’S SEAT)
(A) 6–GROUND
: APPROX. 12 VOLTS WITH STOP LIGHT SW ON
(B) 7–GROUND
: ALWAYS APPROX. 12 VOLTS
(A) 7–GROUND
: APPROX. 12 VOLTS WITH IGNITION SW ON
(A) 15–GROUND
: APPROX. 12 VOLTS WITH IGNITION SW ON AND SHIFT LEVER AT “P” RANGE
(A) 2–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT FRONT SLIDE OPERATION
(A) 9–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT REAR SLIDE OPERATION
(A) 4–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT FRONT VERTICAL UP OPERATION
(A) 11–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT FRONT VERTICAL DOWN OPERATION
(A) 13–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT REAR VERTICAL UP OPERATION
(A) 12–GROUND
: APPROX. 12 VOLTS WITH DRIVER’S SEAT AT REAR VERTICAL DOWN OPERATION
(B) 18–GROUND
: ALWAYS CONTINUITY
(A) 5, (A) 14–GROUND : ALWAYS APPROX. 12 VOLTS
(A) 1, (A) 8–GROUND : ALWAYS CONTINUITY
P 8
POWER SEAT CONTROL SW (FOR DRIVER’S SEAT)
4–14
: CLOSED WITH DRIVER’S SEAT AT FRONT RECLINING OPERATION
3–14
: CLOSED WITH DRIVER’S SEAT AT REAR RECLINING OPERATION
1–14
: CLOSED WITH DRIVER’S SEAT AT FRONT SLIDE OPERATION
2–14
: CLOSED WITH DRIVER’S SEAT AT REAR SLIDE OPERATION
5–14
: CLOSED WITH DRIVER’S SEAT AT FRONT VERTICAL UP OPERATION
6–14
: CLOSED WITH DRIVER’S SEAT AT FRONT VERTICAL DOWN OPERATION
9–14
: CLOSED WITH DRIVER’S SEAT AT REAR VERTICAL UP OPERATION
8–14
: CLOSED WITH DRIVER’S SEAT AT REAR VERTICAL DOWN OPERATION
P12
POWER SEAT ECU (FOR PASSENGER’S SEAT)
1–GROUND : ALWAYS APPROX. 12 VOLTS
8–GROUND : ALWAYS APPROX. 12 VOLTS
7–GROUND : APPROX. 12 VOLTS WITH PASSENGER’S SEAT AT FRONT SLIDE OPERATION
17–GROUND : APPROX. 12 VOLTS WITH PASSENGER’S SEAT AT REAR SLIDE OPERATION
S12
STOP LIGHT SW
2–1 : CLOSED WITH STOP LIGHT SW ON
SERVICE HINTS
160
POWER SEAT (w/ DRIVING POSITION MEMORY)
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
B 5
P11
B
R19
D10
P12
R20
D12
P13
S12
F19
P14
S19
N 1
P15
S20
P 3
P16
S21
P 8
P17
T10
P 9
P18
T19
P10
A
P19
: RELAY BLOCKS
CODE
SEE PAGE
RELAY BLOCKS (RELAY BLOCK LOCATION)
2
ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B
ENGINE ROOM MAIN WIRE
1C
FLOOR WIRE
1D
FRONT DOOR LH WIRE
1H
1I
COWL WIRE
1J
COWL WIRE
1K
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IF1
FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IF2
FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IJ1
ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IT1
ENGINE WIRE AND A/C WIRE (BEHIND GLOVE BOX)
BT1
FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)
BU1
FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
BX1
FLOOR NO. 3 WIRE AND COWL WIRE (RIGHT KICK PANEL)
Ba1
FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)
Ba2
FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)
Bb1
FLOOR NO. 3 WIRE AND FRONT SEAT RH WIRE (UNDER THE FRONT RH SEAT)
: GROUND POINTS
CODE
SEE PAGE
GROUND POINTS LOCATION
IF
LEFT KICK PANEL
IH
UNDER THE ASHTRAY LH
BK
UNDER THE CENTER PILLAR LH
BL
UNDER THE CENTER PILLAR RH
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
I 4
COWL WIRE
B27
FRONT SEAT LH WIRE
I 5
COWL WIRE
B28
FRONT SEAT LH WIRE
B 8
FLOOR MAIN WIRE
B29
FRONT SEAT RH WIRE
B26
FRONT SEAT LH WIRE
B30
FRONT SEAT RH WIRE
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