Toyota Sequoia (2005). Manual - part 530

I28465

D22
Driver Door ECU

S19
Sliding Roof
Control ECU

Combination Meter

I19
A/C ECU
(Integration Control and Panel)

Memory Seat ECU
& Switch

Body ECU

J/C

Back Door ECU

F18
Passenger
Door ECU

Instrument Panel J/B

J/C

IB1

1M

1G

B7

B7

B5

M6

C5

II2

J33

J34

BI2

BD2

BF1

B11

C5

C5

B11

J33

J34

BD2

BF1

II2

J33

J34

IB1

MPX1

MPX2

MPX3

MPX1

MPX2

MPX1

MPX1

MPX2

MPX1

MPX2

MPX1

MPX–

MPX+

W–L

G–B

G–O

LG–B

L–Y

LG–R

W

W–L

G–O

W

LG–R

LG–R

B

LG–R

B

B

B

B

B

A

G

H

A

G

W

(*2)

10

8

11 (*2)

2

1

14

7

6

2

4

G–B

17

1

3

13

24

31

32

30

8

(*3)

(*1)

(*1)

(*1)

(*3)

3

9

12

20

22

8

20

2

G–B

(*1): w/ Driving Position Memory
(*2): w/o Driving Position Memory
(*3): w/ Sliding Roof

8 (*1)

(*1)

20

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1915

2109

WIRING DIAGRAM

DI–1916

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2110

INSPECTION PROCEDURE

1

Check apparatus.

CHECK:
Choose the apparatus to be inspected.

Apparatus

Go to step

w/ Sliding roof

A

w/o Sliding roof

B

B

Go to step 4.

A

2

Check the communication circuit inside the sliding roof control ECU.

PREPARATION:
Disconnect connector ”S19” of the sliding roof control ECU.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace sliding roof control ECU.

NG

3

Check for a short circuit between the sliding control ECU and body ECU.

PREPARATION:
(a)

Reconnect connector ”S19” of the sliding roof control ECU (only vehicles w/ sliding roof).

(b)

Disconnect connector ”B7” of the body ECU.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1917

2111

OK

Repair or replace the wire harness between the
sliding roof control ECU and body ECU.

NG

4

Check the communication circuit inside the driver door ECU.

PREPARATION:
(a)

Reconnect connector ”B7” of the body ECU (only vehicles w/ sliding roof).

(b)

Disconnect connector ”D22” of the driver door ECU.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the driver door ECU.

NG

5

Check the communication circuit inside the front passenger door ECU.

PREPARATION:
(a)

Reconnect connector ”D22” of the driver door ECU.

(b)

Disconnect connector ”F18” of the front passenger door ECU.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the front passenger door ECU.

NG

DI–1918

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2112

6

Check for a short circuit between the driver door ECU and front passenger door
ECU.

PREPARATION:
Disconnect connector ”D22” of the driver door ECU.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Repair or replace the wire harness between the
driver door ECU and front passenger door ECU.

NG

7

Check communication circuit inside the back door ECU.

PREPARATION:
(a)

Reconnect connector ”D22” of the driver door ECU.

(b)

Reconnect connector ”F18” of the passenger door ECU.

(c)

Disconnect connector ”B11” of the back door ECU.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the back door ECU.

NG