Lexus ES300 (1997 year). Service manual — part 400
N21260
Seat Position Control ECU
SGND
SYSB
Battery
ECU–B
R/B No.2
BR
2J
1V
B
J/C
BR
W–R
W–R
W–R
2A
1W
B
9
1
9
4
5
1
7
BS2
Instrument Panel J/B
W–R
ID1
SHOR
T–PIN
B–G
FL MAIN
BS2
10
3
IH
S15
S15
W–R
N21252
SGND
SYSB
LOCK
11
9
(+)
(–)
Connect
Seat Position Control ECU
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–377
529
1997 LEXUS ES300 (RM511U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power for ECU operation and is also the power source for the sensor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals SYSB and SGND of Seat Position Control ECU
connector.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminals SYSB and SGND of Seat
Position Control ECU connector.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
DI0G1–01
N21253
Seat Position Control ECU
Disconnect
(+)
(–)
11
SGND
DI–378
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
530
1997 LEXUS ES300 (RM511U)
2
Check continuity between terminals SGND of Seat Position Control ECU connec-
tor and body ground.
CHECK:
Measure resistance between terminal SGND of Seat Position
Control ECU connector and body ground.
OK:
Resistance: Continuity (below 1
Ω
)
NG
Repair or replace harness or connector.
OK
3
Check ECU–B fuse.
NG
Check for short in all the harness and compo-
nents connected to ECU–B fuse and repair them
(See attached wiring diagram).
OK
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.
N21261
Reclining Motor
Slide Motor
Rear Vertical Motor
Front Vertical Motor
Seat Position Control ECU
RCL–
RCL+
SLD–
SLD+
RRV–
RRV+
FRV–
FRV+
R–B
R–G
L–B
L
L–Y
R
L–R
R–L
GND
8
A
2
J/C
5
W–B
W–B
4
3
2
1
6
9
10
7
1
2
1
2
2
1
1
S14
BN
BS2
S14
S14
S14
S14
S14
S14
S14
S14
N21468
2
Slide Motor
2
1
1
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–379
531
1997 LEXUS ES300 (RM511U)
Motor Circuit
CIRCUIT DESCRIPTION
The Seat Position Control ECU controls the 4 motors for slide, front vertical, rear vertical and reclining.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check motor.
PREPARATION:
1. Remove seat.
2. Disconnect each motor connector.
CHECK:
Check seat movement when battery positive voltage is applied
to each motor.
Slide motor
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the slide motor connector.
OK:
The seat moves forward.
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the slide motor connector.
OK:
The seat moves back.
DI0G4–01
N21467
N21465
N21466
I00528
Front Vertical Motor
Reclining Motor
Rear Vertical Motor
2
1
2
1
2
1
2
1
2
1
2
1
DI–380
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
532
1997 LEXUS ES300 (RM511U)
Front vertical motor
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the front vertical motor connector.
OK:
The front of the seat cushion rises.
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the front vertical motor connector.
OK:
The front of the seat cushion lowers.
Rear vertical motor
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the rear vertical motor connector.
OK:
The front of the seat cushion rises.
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the rear vertical motor connector.
OK:
The front of the seat cushion lowers.
Reclining motor
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the reclining motor connector.
OK:
The seat back return to up right.
CHECK:
Connect battery
to terminal 2 and battery
to terminal 1 of
the reclining motor connector.
OK:
The seat back reclining.
NG
Replace motor.
OK
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