2001 TOYOTA AVALON diagram

- 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

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

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

BE3991
1 pulse output per one
turn of motor
Position Sensor
(in Motor)8 V
0 V
ECU
N14754
Example: Slide Motor
Motor Sensor
(+)
2
(+) (-)
(-)1 31 2
DI-506- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
662 Author
: Date
:
2001 AVALON (RM808U)
Position Sensor Circuit
CIRCUIT DESCRIPTION
The position sensor senses movement of the seat and send
pulse signals to the ECU. The position sensor sends pulse to
the ECU in proportion to the amount of seat movement, as
shown in the diagram on the left.
The ECU uses the number of pulses to constantly calculate the
position relative to the memory position and returns the seat to
the memorized position.
If a malfunction occurs in a position sensor and a sensor signal
is not input to the ECU even when the motor operates, the ECU
prohibits return operation.
WIRING DIAGRAM
See page DI-504.
INSPECTION PROCEDURE
1 Check position sensor.
PREPARATION:
Disconnect the connector of the sensor and the connector of
the motor leading to the sensor.
CHECK:
(a) Connect positive
lead to terminal 3 of sensor and nega-
tive  lead to terminal 2.
(b) Measure voltage between terminal 1 of sensor and body
ground when battery positive voltage is applied between
terminals 1 and 2 of motor connector.
HINT:
When the battery positive voltage is applied to the motor con-
nector terminals,
and  are interchangeable.
OK:
ConditionVoltage
Motor stopped
(Check several times with the motor in a
different position each time.)0 V or battery positive voltage according
to stop position.
with motor turninghalf of battery positive voltage
NG Replace position sensor.
OK
DI0G9-08

I13624
SSRR
PVCC
SSFV SSRS
SSRL L-BL
R
L-W53
4 16
17Power Seat ECU
1 2
1 2
1 2
1 2
3 3 3 3
BR
BR
BR B
BB B
BR J14
J/C
9
9
BR
BR A
AJ3
J/C
IHP21
P21
P21
P21
P21 L-R BR
P30
P29
P32
P31
Power Seat
Position Sensor
Reclining Control
Front Vertical Control
Rear Vertical Control Slide Control
IA1 BC1
BR
J/CJ14
A
A
A A R
R
R
R DI-504
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
660 Author
: Date
:
2001 AVALON (RM808U)
Position Sensor Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to the slide, front vertical and reclining position sensors.
WIRING DIAGRAM
DI0G6-09

I11593
(+) (-)
5 (PVCC)
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-505
661 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminal PVCC of Seat Position Control ECU connector
and body ground.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
While operating the Power Seat Control Switch and moving the
seat, check voltage between terminal PVCC of Seat Position
Control ECU connector and body ground.
OK:
Voltage: 7.2 - 8.8 V
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-493).
NG
2 Check harness and connector connected to terminal PVCC of Seat Position Con-
trol ECU (See page IN-30).
CHECK:
Check for open or short in the harness and check connectors for the position sensor power source circuit
outlined in the diagram with a thick line (-).
NG Repair or replace harness or connector.
OK
Check and replace Seat Position Control
ECU.

I13623
Power Seat Switch
RCLR
BKJ11
J/C 8R-B
B-Y
R-W
R-YG
G-B
B
7 2
3
10
9 6 5
11B-R
W-B
A W-B W-B W-B 1
CC CRCLF
FDWN
FUP
SLDR
SLDF
LUP
LDWN
GND Power Seat ECU
P18
BC1P21
P21
P21
P21
P21
P21
P21
P21
P2112
10
24
23
8
6
22
11
7
J14
J/C DI-510
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
666 Author
: Date
:
2001 AVALON (RM808U)
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
DI0GG-06