TOYOTA AVALON 2001 Service Repair Manual

DI-496- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
652 Author
: Date
:
2001 AVALON (RM808U)
3 Check POWER SEAT fuse.
NG Check for short in all the harness and compo-
nents connected to the POWER SEAT fuse, and
repair them (See attached wiring diagram).
OK
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.

I13626
SGND
SYSB J14
J/C
25 19
3C5
FL MAIN
BatteryEngine Room J/B J/B No. 3
IHP21
P21
W-G
DCC ECU-B
FL BlockB
BR BRB 9
BC1
BR 9
IA1
BR
J13
J/C A
A3E14
W-G W-G5
BC1
Driver Side J/B
1B9
1J9
W-L
2C1
2G2
B
F71
F61
B
BRPower Seat ECU
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-497
653 Author
: Date
:
2001 AVALON (RM808U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power for ECU operation and is also the power source for the sensor.
WIRING DIAGRAM
DI0G1-09

I11592
(-)
(+)
25 (SYSB)19 (SGND)
I11591
(-)(+)19 (SGND)
DI-498- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
654 Author
: Date
:
2001 AVALON (RM808U)
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
problem symptom table (See page DI-493).
NG
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 W)
NG Repair or replace harness or connector.
OK

- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-499
655 Author
: Date
:
2001 AVALON (RM808U)
3 Check ECU-B No. 2 fuse.
NG Check for short in all the harness and compo-
nents connected to ECU-B No. 2 fuse and repair
them (See attached wiring diagram).
OK
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.

I14526
Power Seat ECU
Battery 7
IG 13
8
R-B
43 1
FL MAIN 2
B-L AM1
B FL Block
IG
W-BR-B R-B
Ignition Switch
4
2
W-L W-L
B
ALTBC1 ID1 2
4 1D
1C 1BIG1 RELAY
GAUGE NO. 1
1
2
1
1 55
2H
2G1
F81
F6
I15 W-R
7
IF1P21
AM1 IG1 Driver Side J/B
Engine Room R/B No. 5
Engine Room J/B 3 1
1G
F10
1
W DI-508
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
664 Author
: Date
:
2001 AVALON (RM808U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
This circuit sends an ignition switch ON or OFF signal to the ECU.
WIRING DIAGRAM
DI0GF-09

I11595
(+)
(-)
13 (IG)
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-509
665 Author
: Date
:
2001 AVALON (RM808U)
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 switchVoltage
ON10 ~ 14 V
OFF0 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-493).
NG
2 Check GAUGE fuse.
NG Check for short in all the harness and compo-
nents connected to GAUGE fuse.
NG
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.

I13619
Remoto Control Mirror Switch
MIRE
MIRG MIRB 18
2 1 3
Y-G 9
8
7P21
W-L
PP21
P21 15
3 10
14 4 IA1 BC1
PP
Y-G Y-G W-L W-L E
MSW
M+
R5
Power Seat ECU
IA1
IA1BC1
BC1
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-515
671 Author
: Date
:
2001 AVALON (RM808U)
Mirror switch circuit
CIRCUIT DESCRIPTION
This circuit detects the conditions of the mirror selection switch and the mirror position switch.
WIRING DIAGRAM
DI6KZ-01

DI-516- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
672 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check mirror switch (See page BE-1 14).
NG Replace the mirror switch.
OK
2 Check wireharness and connector between mirror switch and power seat control
ECU.
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-493).

I13625
RCL-
RCL+
SLD-
SLD+
LFT+
LFT- FRV-
FRV+ W-BGND
2 17Power Seat ECU
12
21
2
1 21
W-B
W-BCCJ14
J/C
11
A
J11
J/CP20
P20
P20
P20
P20
P20
P20
P20
P20 BK BC1P24 Power Seat Motor
Reclining Control
P22 Power Seat Motor
Front Vertical Control
P25 Power Seat Motor
Slide Control
P23 Power Seat Motor
Rear Vertial ControlR-B
R-W
L-W
L-R
L-B
L
L-Y
R9
10
3
4
6
5 DI-500
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
656 Author
: Date
:
2001 AVALON (RM808U)
Motor Circuit
CIRCUIT DESCRIPTION
The Seat Position Control ECU controls the 4 motors for slide, front vertical, rear vertical and reclining.
WIRING DIAGRAM
DI0G4-08

N21468
Slide Motor
21
21
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-501
657 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check motor.
PREPARATION:
(a) Remove seat.
(b) 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 backward.