Toyota Sequoia (2005). Manual - part 328

F19704

Translate ECU

ENG+

ENG–

14
T5

16
T5

R

W

1

J55

2

J55

1

J53

2

J53

Junction Connector

L

W

33

E5

34

E5

3

E4

ECM

CANH

CANL

BATT

B–Y

11

IA4

D6 DLC3

6

14

CANH

CANL

BAT

B

W

1

J54

2

J54

1

J56

2

J56

Suspension Control ECU

G

W

(*1)

(*1)

29

S25

28

S25

25

S25

CANH

CANL

BAT

V

B

J37

C

J38

V

V

5

IA5

B–Y

V

V

Engine Room J/B & R/B No.2

EF1 No.1

AIR SUS No.2

7

2H

2

2

1

2D

B

W

W
W

B

W

4 9

8

AIR 
SUS

ALT

5 B

F10 
FL 
Block

Battery

1

1L

13
1F

1

2

OBD

Instrument Panel J/B

W–R

16

*1: w/ Air Suspension System

1

2

J/C

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1107

1301

Check CAN Bus Line For Short To + B

CIRCUIT DESCRIPTION

A short to +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 6
(CANH) or terminals 16 (BAT) and 14 (CANL) of the DLC3.

Symptom

Trouble Area

There is continuity between terminals 16 (BAT) and 6
(CANH) or 16 (BAT) and 14 (CANL) of the DLC3.

Short to +B in CAN bus line

ECM

Translate ECU

Suspension control ECU

WIRING DIAGRAM

DIDIF–01

F19749

Junction Connector ”A” Side 
(w/ Earth Terminal) Wire Harness View:

J54

W

B

Earth Terminal

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

F19737

DLC3:

D6

CANH

CANL

BAT

DI–1108

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1302

INSPECTION PROCEDURE

1

Check CAN bus line for short to +B (DLC3 sub bus line).

PREPARATION:
Disconnect the DLC3 sub bus line connector (J54) from the
junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified value

D6–16 (BAT) – 

D6–6 (CANH)

Ignition Switch OFF

1 M

Ω

 or higher

D6–16 (BAT) – 

D6–14 (CANL)

Ignition Switch OFF

1 M

Ω

 or higher

NG

Repair or replace DLC3 sub bus line or connec-
tor (CAN–H, CAN–L).

OK

2

Connect the connector.

Reconnect the DLC3 sub bus line connector (J54) to the junction connector.

NEXT

F19749

Junction Connector ”A” Side
(w/ Earth Terminal)
Wire Harness View:

J53

W

L

Earth Terminal

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

F19737

DLC3:

D6

CANH

CANL

BAT

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1109

1303

3

Check CAN bus line for short to +B (ECM main bus line).

PREPARATION:
Disconnect the ECM main bus line connector (J53) from the
junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified value

D6–16 (BAT) – 

D6–6 (CANH)

Ignition Switch OFF

1 M

Ω

 or higher

D6–16 (BAT) – 

D6–14 (CANL)

Ignition Switch OFF

1 M

Ω

 or higher

OK

Go to step 8.

NG

4

Connect the connector.

Reconnect the ECM main bus line connector (J53) to the junction connector.

NEXT

F19749

Junction Connector ”A” Side
(w/ Earth Terminal)
Wire Harness View:

J55

W

R

Earth Terminal

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

F19737

DLC3:

D6

CANH

CANL

BAT

DI–1110

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1304

5

Check CAN bus line for short to +B (Translate ECU main bus line).

HINT:
For vehicles without an enhanced air suspension system, go to
step 11.
PREPARATION:
Disconnect the translate ECU main bus line connector (J55)
from the junction connector.
NOTICE:

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified value

D6–16 (BAT) – 

D6–6 (CANH)

Ignition Switch OFF

1 M

Ω

 or higher

D6–16 (BAT) – 

D6–14 (CANL)

Ignition Switch OFF

1 M

Ω

 or higher

OK

Go to step 10.

NG

6

Connect the connector.

Reconnect the translate ECU main bus line connector (J55) to the junction connector.

NEXT