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 

DI–1508

).

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