Toyota Sequoia (2005). Manual — part 538

I28471

Combination Meter

Memory Seat ECU
& SW

Sub J/B No. 3

J/C

J24
J/C

Instrument Panel J/B

F10
Fusible Link Block

I18
Ignition SW

Engine Room J/B

Battery

BH

J24
J/C

J/C

J/C

C5

J33

BI2

M6

J34

J31

J32

3A

3A

J33

J34

J33

J34

BI2

BI2

BI2

M6

M6

M7

AM1

ECU–IG

1F

1L

1J

1E

1G

1C

1

4

6

1

16

2

1C

2

4

PWR SEAT

1

2

M7

BI2

ECU–B

Short Pin

2D

2C

1

8

ALT

IG1

AM1

1

2

B

B

W–B

W–B

W–B

B

5

8

W

W–L

W–R

W–R

B–Y

B–R

L–O

3

W–R

W–R

W–R

W–R

B–R

B–R

B–R

L–O

L–O

L–O

L–O

3

1

11

8

15

16

4

1

5

A

9

C

A

G

G

A

W

W

W

17

30

C

L

I

F

MPX1

+B

IG

SYSB

GND

1

4

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1947

2141

WIRING DIAGRAM

DI–1948

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2142

INSPECTION PROCEDURE

1

Check power seat control system (w/ driving position memory).

CHECK:
Check the operation of the power seat.
OK:

The power seat control system operates normally.

NG

Go to power source circuit (See page

DI–1514

).

OK

2

Check wire harness (Memory seat ECU & switch – combination meter).

PREPARATION:
Disconnect connector ”M6” of the memory seat ECU and ”C5” of the combination meter.
CHECK:
Measure the resistance according to the values in the table below.
OK:

Tester connection (Symbols)

Condition

Specified condition

M6–1 (MPX1) – C5–30

Always

Below 1

Ω

M6–1 (MPX1) – Body ground

Always

10 k

Ω

or higher

NG

Repair or replace wire harness or connector.

OK

Replace memory seat ECU & switch.

If the problem recurs even after replacement, replace the body ECU.

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1949

2143

DTC

B1273

Sliding roof ECU communication stop
(w/ Sliding roof)

CIRCUIT DESCRIPTION

This DTC is indicated when communication fails between the sliding roof ECU and body ECU.

DTC No.

DTC Detecting Condition

Trouble Area

B1273

No communication from sliding roof ECU for more than 10

Sliding roof ECU

Wi

h

B1273

No communication from sliding roof ECU for more than 10

seconds.

Wire harness

Body ECU

DIDFL–01

I28472

S19
Sliding Roof
Control ECU

Instrument Panel J/B

Body ECU

I18
Ignition SW

Instrument Panel J/B

F10
Fusible Link Block

Battery

IE

J8
J/C

MPX1

E

B

IG

MPX3

IG1

AM1 1

2

AM1

ECU–IG

1F

1L

1M

B7

1

6

1

2

1C

4

SUN–ROOF

7

ALT

5

8

W

A

W–B

B

W–B

1

5

1M

1M

10

W–L

L–W

B–R

W–L

B–Y

2

7

5

1M

1G

L–W

W–B

G–O

G–O

B–R 8

9

12

20

1C

DI–1950

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2144

WIRING DIAGRAM