Toyota Sequoia (2005). Manual — part 430
I28446
B–R
W–B
W–R
W–L
W–B
W–R
W–R
W–R
W–R
B–R
B–R
B–R
W–R
L–O
L–O
L–O
L–O
B–Y
B–R
L–O
1
2
3
4
5
6
8
5
4
A
B
C
F
I
W
B
A
A
A
B
B
W–B
8
1
1
3
L
C
G
1C
1E
1F
1G
1J
2C
2D
3A
3C
1L
1C
3A
3A
4
16
4
1
2
2
1
9
15
16
8
8
Sub J/B No. 3
J/C
J/C
J24 J/C
J/C
1
11
Sub J/B No. 3
J31
J32
J37
J38
J33
J34
J33
J34
J24 J/C
Instrument Panel J/B
I18
Ignition SW
Engine Room J/B
F10
FL Block
ALT
8
BI2
M7
M6
M6
BI2
BI2
Position Control
ECU & Switch
+B
IG
SYSB
GND
1
2
BI2
Battery
BH
AM1
AM1
PWR SEAT
ECU–IG
IG1
M7
ECU–B
Short Pin
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1515
1709
WIRING DIAGRAM
DI–1516
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1710
INSPECTION PROCEDURE
1
Check fuse (PWR SEAT, ECU–IG, AM1).
PREPARATION:
Remove the PWR SEAT, ECU–IG and AM1 fuses from the instrument panel J/B.
CHECK:
Measure the resistance.
OK:
Below 1
Ω
NG
Replace fuse.
OK
I28698
Position Control ECU & Switch Assy
Wire Harness Side
Connector Front View:
M7
M6
GND
+B
IG
SYSB
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1517
1711
2
Inspect position control ECU & switch assy.
PREPARATION:
Disconnect the M6 and M7 ECU connectors.
CHECK:
(a)
Measure the voltage of each terminal of the wire harness side connectors.
OK:
Tester Connection (Symbol)
Condition
Specified Condition
M7–5 (+B) – Body ground
Always
10 to 14 V
M6–8 (SYSB) – Body ground
Always
10 to 14 V
M6–4 (IG) – Body ground
Ignition switch OFF
→
ON
Below 1 V
→
10 to 14 V
(b)
Measure the resistance between the M7 ECU wire harness side connector and body ground.
OK:
Tester Connection (Symbol)
Specified Condition
M7–1 (GND) – Body ground
Below 1
Ω
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
).
I28447
D24
Seat Memory Switch
Body ECU
SET
4
3
2
1
W–B
L
L–Y
G
23
22
24
B6
A
M1
M2
MM
B6
B6
1
2
E
J8 J/C
IE
M1
M2
MRY
DI–1518
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1712
Memory switch circuit
CIRCUIT DESCRIPTION
The seat memory switch sends signals to the position control ECU & switch assy via multiplex communica-
tion to memorize a given seat position. This memory system does not use a position sensor. The seat posi-
tion is detected by counting pulses that are output when the motor turns. If there is no pulse output from the
motor, the motor will stop operating. The seat memory switch is later used to send signals to the position
control ECU to return to one of the memorized positions.
The power seat memory operation is performed only when the ignition switch is in the ON position and the
park/neutral position switch is in the P (park) position.
WIRING DIAGRAM
DIDE8–01
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