Toyota Sequoia (2005). Manual — part 431
I27717
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1519
1713
INSPECTION PROCEDURE
1
Inspect seat memory switch.
PREPARATION:
Disconnect the seat memory switch connector.
CHECK:
Measure the resistance of each terminal, as shown in the il-
lustration and table.
OK:
Tester Connection
Switch Position
Specified Condition
1 – 4
SET switch OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
2 – 4
Memory switch 1 OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
3 – 4
Memory switch 2 OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
NG
Replace seat memory switch.
OK
I27700
B6
Body ECU Wire Harness View:
MM
M1
M2
DI–1520
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1714
2
Check harness and connector (Body ECU & seat memory switch – body ground).
PREPARATION:
(a)
Reconnect the seat memory switch connector.
(b)
Disconnect the B6 body ECU connector.
CHECK:
Measure the resistance of each terminal, as shown in the il-
lustration and table.
OK:
Tester Connection
(Symbol)
Switch Position
Specified Condition
B6–23 (M1) –
Body ground
Memory switch 1 OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
B6–24 (MM) –
Body ground
SET switch OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
B6–22 (M2) –
Body ground
Memory switch 2 OFF
→
ON
10 k
Ω
or higher
→
Below 1
Ω
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
).
I28448
PWR SEAT
Instrument Panel J/B
ALT
16
1
1
2
L–O
L–O
BI2
9
L4
Lumbar Support Control
Switch (Driver’s Seat)
3
1
2
4
5
Rear
Front
W
W–B
W–B
BH
Battery
L
R
1
L
A
A
BI2
1G
1L
F10
FL Block
J24 J/C
L3
Lumbar Support
Control Motor
L–O
J24 J/C
J/C
L–O
J31
J32
3
R
B
H
B
5
8
C
G
B
B
B
2
W–B
W–B
E2
E
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1521
1715
Lumbar support control switch circuit
CIRCUIT DESCRIPTION
The lumbar support control switch that controls lumbar support is connected to the lumbar support control
motor via a wire harness. This circuit can freely operate regardless of the condition of the ECU.
WIRING DIAGRAM
DIDE9–01
I28700
HOLD (Front)
RELEASE (Rear)
DI–1522
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1716
INSPECTION PROCEDURE
1
Check fuse (PWR SEAT).
PREPARATION:
Remove the PWR SEAT fuse from the instrument panel J/B.
CHECK:
Measure the resistance.
OK:
Below 1
Ω
NG
Replace fuse.
OK
2
Inspect lumbar support control switch.
PREPARATION:
Disconnect the lumbar support control switch connector.
CHECK:
Measure the resistance of each terminal, as shown in the il-
lustration and table.
OK:
Tester Connection
Switch Position
Specified Condition
1 – 2
HOLD (Front)
Below 1
Ω
3 – 4
HOLD (Front)
Below 1
Ω
1 – 2
OFF
Below 1
Ω
4 – 5
OFF
Below 1
Ω
1 – 3
RELEASE (Rear)
Below 1
Ω
4 – 5
RELEASE (Rear)
Below 1
Ω
NG
Replace lumbar support control switch assy
(See page
OK
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