Lexus ES300 (1997 year). Manual — part 403
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–389
541
1997 LEXUS ES300 (RM511U)
2
Check voltage between terminal P of Seat Position Control ECU connector and
body ground.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminal P of Seat Position
Control ECU connector and body ground when the shift
lever is positioned to the following ranges.
OK:
Shift position
Voltage
P
10
∼
14 V
Other than P
0 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
Check and repair harness and connector be-
tween Seat Position Control ECU and park/
neutral position switch.
N21265
Instrument Panel J/B
Seat Position Control ECU
Ignition Switch
Battery
ALT
J/C
F6
Instrument Panel J/B
FL
3
IG
20
B–R
W
B–R
4
B–R
B–R
B–Y
4
2
2
1
1
FL MAIN
2
S15
IF1
1K
1K
F11
BS2
1D
1K
8
1
AM1
B–R
B–G
ECU–B
N21256
Seat Position Control ECU
ON
LOCK
Connect
(–)
(+)
20
IG
ON
LOCK
DI–390
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
542
1997 LEXUS ES300 (RM511U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
This circuit sends an ignition switch ON or OFF signal to the ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminal IG of Seat Position Control ECU connector and
body ground.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminal IG of Seat Position Control
ECU connector and body ground when ignition switch is on and
off.
OK:
Ignition switch
Voltage
ON
10
∼
14 V
OFF
0 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
DI0GF–01
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–391
543
1997 LEXUS ES300 (RM511U)
NG
2
Check ECU–IG fuse.
NG
Check for short in all the harness and compo-
nents connected to ECU–IG fuse.
NG
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.
N21266
Power Seat Control Switch
Power Seat Control ECU
SLDF
SLDR
RUP
RDWN
FUP
FDWN
RCLF
RCLR
12
L
BR
8
SGND
13
14
15
16
17
18
19
11
L–B
Y–G
L–Y
L–R
G
G–B
BR
BR
4
2
3
10
9
1
5
12
8
S15
S15
S15
S15
S15
S15
S15
S15
S15
G–W
BS2
IH
N21257
Seat Position Control ECU
SLDF
SLDR
RUF
RDWN
FUR
FDWN
RCLF
RCLR
SGND
(–)
(+)
Connect
DI–392
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
544
1997 LEXUS ES300 (RM511U)
Power Seat Control Switch Circuit
CIRCUIT DESCRIPTION
When the power seat control switch is operated, a signal is sent from the power seat control switch to the
ECU and the ECU sends a signal to the motor to make it operate.
Even if a malfunction should occur with the position sensor and return operation is prohibited, manual opera-
tion will occur as normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between each terminal of the Power Seat Control Switch and
SGND of Seat Position Control ECU connector.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between each terminal of the Power Seat
Control Switch and SGND of Seat Position Control ECU con-
nector. (The illustration shows inspection of the reclining as an
example.)
OK:
At each terminal with switch ON
0 V
At each terminal with switch OFF
10
∼
14 V
DI0GG–01
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