1991 LEXUS SC400 Service Repair Manual

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Page 4009 of 4087

$LEXUS SC400 1991 Service Repair Manual 11015 14 13 12 12345 123 GRAY GRAY C14 P 1 P 2 S 3 X 2 2 BA S22 S23 187 THE PPS (HYDRAULIC REACTION TYPE) CONTROLS THE HYDRAULIC PRESSURE APPLIED\ TO THE HYDRAULIC REACTION CHAMBER IN THE GEAR BOX C$

11015
14
13 12
12345 123
GRAY GRAY
C14 P 1 P 2 S 3
X
2 2
BA
S22 S23
187
THE PPS (HYDRAULIC REACTION TYPE) CONTROLS THE HYDRAULIC PRESSURE APPLIED\
TO THE HYDRAULIC REACTION
CHAMBER IN THE GEAR BOX CONTROL UNIT USING THE PPS ECU, TO CHANGE THE STEERING FORCE AND PROVIDE OPTIMUM
STEERING FEELING AT ANY VEHICLE SPEED AND UNDER ANY STEERING CONDITIONS.
(PPS OPERATION)
WHEN THE IGNITION SW IS TURNED ON THE STARTING CURRENT FLOWS FROM THE ECU±IG FUSE TO TERMINAL 4 OF THE PPS
ECU. THE SPEED SENSOR MONITORS THE VEHICLE SPEED AND TRANSMITS CONTROL SIGNALS TO TERMINAL 3 OF THE ECU.
WHEN THE VEHICLE SPEED IS LOW, THE PPS ECU SENDS A HIGHER±VOLTAGE FROM TERMINAL 1 OF THE ECU " TERMINAL 1 OF
THE SOLENOID VALVE " TERMINAL 2 " TERMINAL 5 OF THE ECU " TERMINAL 2 " GROUND, INCREASING THE SOLENOID VALVE
OPENING ANGLE TO PROVIDE COMFORTABLE STEERING OPERATION. WHEN THE VEHICLE SPEED IS HIGH, THE PPS ECU
DECREASES THE SOLENOID VALVE OPENING ANGLE BY REDUCING THE VOLTAGE TO THE VALVE TO PROVIDE RESPONSIVE
STEERING FEELING.
P 1 PPS SOLENOID
1±2 : APPROX. 7.7 (25 °C, 77°F)
P 2 PPS ECU
4±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
2±GROUND : ALWAYS CONTINUITY
1±5 : APPROX. 0.8A WITH VEHICLE SPEED BELOW 20 KM/H ( 12 MPH)
APPROX. 0.45A WITH VEHICLE SPEED AT 80 KM/H ( 48 MPH)
APPROX. 0.2A WITH VEHICLE SPEED ABOVE 160 KM/H ( 96 MPH)
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C1428P 229S22B29
P 127S 327S23A29
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E20INSTRUMENT PANEL WIRE
1H20COWL WIRE1I20COWL WIRE
3A22INSTRUMENT PANEL WIRE3D22INSTRUMENT PANEL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IG236INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)
IJ136ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)IJ236ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IK136ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IH36UNDER THE ASHTRAY LH
IJ36RIGHT KICK PANEL
SYSTEM OUTLINE
SERVICE HINTS
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Page 4010 of 4087

LEXUS SC400 1991 Service Repair Manual
162
POWER SEAT (w/o DRIVING POSITION MEMORY)
FROM POWER SOURCE SYSTEM(
SEE PAGE 56 )
30A
DOOR
1C
8
Ba2
4
BK
Ba2
5
POWER SEAT CONTROL SW
(
FOR DRIVER S SEAT )
REARFRONT
HOLD RE LEA SE
12
12
7
UP
DOWN

Page 4011 of 4087

LEXUS SC400 1991 Service Repair Manual
163
P 8 POWER SEAT CONTROL SW (FOR DRIVERS SEAT)
12±GROUND :ALWAYS CONTINUITY 7±GROUND :ALWAYS APPROX. 12 VOLTS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
P 832P1432P1632
P1332P1532P1

Page 4012 of 4087

LEXUS SC400 1991 Service Repair Manual
154
POWER SEAT (w/ DRIVING POSITION MEMORY)
PRND 2 L146578 9
GR
R±B
L
G±W G
W
A/T INDICATOR SW
[NEUTRAL START SW AND BACK±UP LIGHT SW]
N1
IT1
12
1I
10 1H 12
1C
10 1H
1
A
6
STOP A
15
P
A
3 RCL+
A
1

Page 4013 of 4087

LEXUS SC400 1991 Service Repair Manual
155
M
21
M
21
M
21
IH IF
6 3
214
3
12
11
2
1
9
8 3
B
18 SGND
B
8 SI
B
17 SO
A
2
SLD+ A
9
SLD± A
4
FRV+ A
11
FRV± A
13
RRV+ A
12
RRV±
1D
8
1J
1
Ba1
4Ba1 9
Ba2
13 1I
16
1D
10
BT1
11 BT1 12 IF1 12 IF

Page 4014 of 4087

LEXUS SC400 1991 Service Repair Manual
156
POWER SEAT (w/ DRIVING POSITION MEMORY)
REARFRONT
M
12
BK
A
8 GND2
A
1 GND
B
1 SLDF
B
9 SLDR
B
3 FUP
B
11 FDWN
B
4 RUP
B
12 RDWN
B
2 RCLF
B
10 RCLR
B
9
SYSB
A
7
IG A
14
+B2 A
+B A
5
1B
5
1C
1
1C

Page 4015 of 4087

LEXUS SC400 1991 Service Repair Manual
157
2 1
1
2 1
42
3
56 2
134
1 12151310 2 113
86516717 13 2
BX1
4
BX1
17 Bb1
6
Bb1
5 B29 B30
B29
B29
M
12
M
21
BL
Bb1
4
+B SLDF SLDR GND SLD+ SLD±
L±W
W±BBR
BR BR BR
BR
R
L± W
W±B
W±B W±B Y±R

Page 4016 of 4087

LEXUS SC400 1991 Service Repair Manual
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

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 ªFRONT SIDE POSITIONº 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 ªREAR SLIDE POSITIONº 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
WhereEverybodyKnowsYourName

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