Page 1087 of 1897
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
Page 1088 of 1897
I11594
(+)
(-)
12 (RLCR)
24 (FDWN)
23 (FUP)11 (LDWN) 10 (RCLF)
8 (SLDR)
6 (SLDF)
19 (SGND)
22 (LUP)
I04159
Lifter
Up
DownReclining
Front Vertical
Up
Down Front BackForward
Rear
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-51 1
667 Author: Date:
2001 AVALON (RM808U)
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 ON0 V
At each terminal with switch OFF10 ~ 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-493).
NG
2 Check power seat control switch.
PREPARATION:
(a) Remove seat.
(b) Disconnect power seat control switch.
CHECK:
Check continuity between terminals when switch operated.
OK:
Driver 's seat slide switch:
Switch positionTester connectionSpecified condition
FRONT1 - 9Continuity
BACK1 - 6Continuity
Driver 's seat front vertical switch:
Switch positionTester connectionSpecified condition
UP1 - 5Continuity
DOWN1 - 10Continuity
Driver 's seat lifter switch:
Switch positionTester connectionSpecified condition
UP1 - 8Continuity
DOWN1 - 7Continuity
Page 1089 of 1897
DI-512- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
668 Author: Date:
2001 AVALON (RM808U)
Driver 's seat reclining switch:
Switch positionTester connectionSpecified condition
FORWARD1 - 3Continuity
REAR1 - 2Continuity
Passenger 's slide switch:
Switch positionTester connectionSpecified condition
FRONT1 - 9Continuity
BACK1 - 6Continuity
Passenger 's front vertical switch:
Switch positionTester connectionSpecified condition
UP1 - 10Continuity
DOWN1 - 5Continuity
Passenger 's lifter switch:
Switch positionTester connectionSpecified condition
UP1 - 7Continuity
DOWN1 - 8Continuity
Passenger 's reclining switch:
Switch positionTester connectionSpecified condition
FORWARD1 - 3Continuity
REAR1 - 2Continuity
NG Replace power seat control switch.
OK
3 Check harness and connectors between Seat Position Control ECU and power
seat control switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace Seat Position Control
ECU.
Page 1090 of 1897
I13621
Seat Memory SwitchPower Seat ECU
SWE SW2
MMRY 21
320
9SW1
7 1 4
2
P21 P21 P21
P21
2
1
MMRY
EY
G-W
G-Y
W-B
S14
I11616
(+)
(-)9 (MMRY)
19 (SGND)
20 (SW2) 21 (SW1)
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-513
669 Author: Date:
2001 AVALON (RM808U)
Seat Memory Switch
CIRCUIT DESCRIPTION
Seat memory switch send memory and return signals to the seat position control ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between each terminal of the seat memory switch and SGND of
Seat Position Control ECU connector.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminal of the seat memory switch
and SGND of Seat Position Control ECU connector.
(The illustration shows inspection of the Memory 1 as an exam-
ple.)
OK:
At each terminal with switch ON0 V
At each terminal with switch OFF10 ~ 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-493).
DI0GH-06
Page 1091 of 1897
N21463
(Example)
Inspection of SET Switch
2
1
DI-514- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
670 Author: Date:
2001 AVALON (RM808U)
NG
2 Check seat memory switch.
PREPARATION:
Disconnect seat memory switch connector.
CHECK:
Check continuity of each terminal.
OK:
Switch positionTerminal
SET switch ON1 - 2
Memory switch 12 - 3
Memory switch 22 - 4
NG Replace seat memory switch.
OK
3 Check harness and connectors between Seat Position Control ECU and seat
memory switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace Seat Position Control
ECU.
Page 1092 of 1897
DI0FR-06
POWER SEAT CONTROL SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
How Often Problem Occurs
/ /
Continuous Intermittent ( Times a day) Brought in
Manual Function
does not operate. Slide Front Vertical Rear Vertical Reclining
Memory function does not operate.
Position return function does not stop when brake pedal is depressed.
Date Problem First Occurred
Problem Symptom
Slide Front Vertical Rear Vertical
Does not operate in any conditions
Only with key inserted
Only with key not inserted
Only with memory & return switch 1 or 2 Return Function
does not operate.
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-489
645 Author: Date:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 1093 of 1897
DI0FP-07
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not occur
Problem Symptom Table
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
EndTitles inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations. 1
23
4
5
7P. DI-489
P. DI-493
P. IN-20
P. DI-494 - DI-513
Symptom occur
6
Parts Inspection
Step 5, 7 : Diagnostic steps permitting the use
of the hand-held tester and break-
out-box.
DI-488- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
644 Author: Date:
2001 AVALON (RM808U)
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.
Page 1094 of 1897
DI0FT-05
I12537Front Vertical MotorEngine Room Junction Block
ECU-B NO. 1 Fuse
Instrument Panel Junction Block
PWR SEAT M-Fuse
Reclining Motor
Power Seat Control ECU
Rear Vertical
Motor
Slide MotorLumbar Support Switch
Seat Memory Switch
Power Seat Control Switch DI-490
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
646 Author: Date:
2001 AVALON (RM808U)
PARTS LOCATION
