Page 1079 of 1897
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
Page 1083 of 1897
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
Page 1085 of 1897
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
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 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 1098 of 1897
DI4CK-03
H01451
Y-B
D+ C6 14Airbag Sensor Assembly
13
C6D- Y 1
2
Spiral
Cable D Squib DI-362
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
518 Author: Date:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC B0100/13 Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-3.
DTC B0100/13 is recorded when a short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0100/13
Short circuit between D+ wire harness and D- wire har-
ness of squib
D squib malfunction
Spiral cable malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Page 1103 of 1897
R14286H01001H01139
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+ u"
(-) (+)D-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-367
523 Author: Date:
2001 AVALON (RM808U)
DTC B0101/14 Open in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see OPERATION on page RS-3.
DTC B0101/14 is recorded when an open is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0101/14
Open circuit in D+ wire harness or D- wire harness of
squib
D squib malfunction
Spiral cable malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
See page DI-362.
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-475)
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D-.
OK:
Resistance: Below 1 W
NG Go to step 5.
OK
DI4CL-02
Page 1107 of 1897
H01001H02145H02198
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(-) (+)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-371
527 Author: Date:
2001 AVALON (RM808U)
DTC B0102/11 Short in D Squib Circuit (to Ground)
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-3.
DTC B0102/11 is recorded when a ground short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0102/11
Short circuit in D squib wire harness (to ground)
D squib malfunction
Spiral cable malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
See page DI-362.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and body ground.
OK:
Resistance: 1 MW or Higher
NG Go to step 5.
OK
DI4DM-02
