Toyota Sequoia (2005). Manual - part 322

F19706

Suspension 
Control ECU

IG

10

S25

B–R

J37

J/C

J37

Sub J/B No.3

B–R

8

3C

8

3A

B–R

Instrument Panel J/B

4

1F

1

1L

ECU–IG

AM1

4

1C

6

1C

B–Y

2

I18
Ignition SW

AM1

IG1

W–L

W

8

ALT

5

B

Battery

F10
FL Block

GND

22

S25

W–B

A

J12
J/C

IF

1

2

1

A

A

Translate ECU

ENG+

ENG–

T5

T5

14

16

ECM

CANH

CANL

Junction Connector

E5

E5

33

34

R

W

W

L

J55

J55

J53

J53

1

2

1

2

J56

J56

1

2

W

G

CANH

CANL

S25

S25

29

28

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1083

1277

Suspension Control ECU Communication Stop Mode

MODE DESCRIPTION

Detection Item

Symptom

Trouble Area

Suspension Con-

trol ECU Commu-

nication Stop

Mode

”RIAR AIRSUS” is not displayed on the ”BUS CHECK”
screen of the hand–held tester.

DTCs are output from each ECU in suspension control
ECU communication stop mode in the ”DTC COMBINA-
TION TABLE” (see page 

DI–1067

).

Power source or inside the suspension control ECU

Suspension control ECU sub bus line

WIRING DIAGRAM

DIDIB–01

F16805

IG

S25

Suspension Control ECU
Wire Harness View:

GND

DI–1084

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1278

INSPECTION PROCEDURE

1

Check wire harness (Suspension control ECU – Battery and Suspension control
ECU – Body ground).

PREPARATION:
Disconnect the suspension control ECU connector (S25).
CHECK:
(a)

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

OK:

Tester connection

Condition

Specified value

S25–22 (GND) – 

Body ground

Always

Below 1 

Ω

(b)

Measure the voltage according to the value(s) in the table
below.

OK:

Tester connection

Condition

Specified value

S25–10 (IG) – 

Body ground

Ignition Switch ON

10 to 14 V

NG

Repair or replace harness or connector 
(Suspension Control ECU – Battery or Suspen-
sion Control ECU – Body ground).

OK

F16805

Suspension Control ECU
Wire Harness View:

CANH

CANL

S25

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1085

1279

2

Check CAN bus line (Suspension control ECU sub bus line).

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

Tester connection

Condition

Specified value

S25–29 (CANH) – 

S25–28 (CANL)

Ignition Switch OFF

54 to 69 

Ω

NG

Repair or replace suspension control ECU sub
bus line or connector (CAN–H, CAN–L).

OK

Replace suspension control ECU
(See page 

SA–171

).

F19701

Translate ECU

ENG+

ENG–

Junction Connector

14

T5

16

T5

R

W

1

J55

2

J55

1

J53

2

J53

L

W

33

E5

34

E5

ECM

CANH

CANL

D6 DLC3

1

J54

2

J54

B

W

6

14

CANH

CANL

DI–1086

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1280

Check CAN Main Bus Line For Disconnection

CIRCUIT DESCRIPTION

The CAN main bus line and DLC3 sub bus line may have a disconnection when the resistance between ter-
minals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 

Ω

.

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of

the DLC3 is more than 69 

Ω

.

CAN main bus line

ECM

Translate ECU

DLC3 sub bus line

WIRING DIAGRAM

DIDIC–01