Toyota Sequoia (2005). Manual - part 536

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1939

2133

2

Check wire harness and connector between automatic light control sensor and
body ECU.

PREPARATION:
Disconnect connector ”A27” of the automatic light control sensor and connector ”B6” of the body ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:

Tester connection (Symbols)

Condition

Specified condition

A27–4 – B6–12 (CLTS)

Always

Below 1 

Ω

A27–1 – B6–4 (CLTB)

Always

Below 1 

Ω

A27–3 – B6–3 (CLTE)

Always

Below 1 

Ω

A27–4 – Body ground

Always

10 k

Ω 

or higher

A27–1 – Body ground

Always

10 k

Ω 

or higher

A27–3 – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace wire harness or connector.

OK

Replace the body ECU.

DI–1940

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2134

DTC

B1262

A/C ECU communication stop

CIRCUIT DESCRIPTION

This DTC is indicated when communication fails between the integration control and panel and  the body
ECU.

DTC No.

DTC Detecting Condition

Trouble Area

B1262

No communication from integration control and panel for more

than 10 seconds.

A/C ECU (Integration control and panel)

Wire harness

Body ECU

DIDFI–01

I28469

I19
Integration Control
and Panel

Body ECU

I18
Ignition SW

Combination Meter

F10
FL Block

To Ignition
Switch

J43
J/C

IG

Battery

DOME

ALT

AM1

CIG

ACC

AM1

Short Pin

J/C

MPX–

ACC

+B

MPX+

MPX2

IG+

GND

C5

B5

J15

1E

1L

1J

J15

1E

1C

1C

2D

2C

3A

3E

3A

3E

O

B

R

W

W–L

O

B

R

P

P

P

R

R–L

R–L

L–Y

LG–B

D

D

32

24

13

3

11

3

1

1

1

8

6

20

1

5

2

8

5

4

1

3

6

6

16

15

1

2

10

Instrument Panel J/B

Engine Room J/B

Sub J/B No.3

A

A

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1941

2135

WIRING DIAGRAM

DI–1942

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2136

INSPECTION PROCEDURE

1

Check air conditioning system.

CHECK:
Check the operation of the air conditioning system.
OK:

The air conditioning system operates normally.

NG

Go to air conditioning system

 

(See page 

DI–2301

).

OK

2

Check wire harness (Integration control and panel – combination meter, integra-
tion control and panel – body ECU).

PREPARATION:
Disconnect connector ”B5” of the body ECU connector, ”I19” of the integration control and panel and connec-
tor ”C5” of the combination meter.
CHECK:
Measure the resistance according to the values in the table below.
OK:

Tester connection (Symbols)

Condition

Specified condition

C5–32 – I19–13 (MPX–)

Always

Below 1 

Ω

B5–24 (MPX2) – I19–3 (MPX+)

Always

Below 1 

Ω

C5–32 – Body ground

Always

10 k

Ω 

or higher

B5–24 (MPX2) – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace wire harness.

OK

Replace integration control and panel.

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