Mitsubishi 380. Manual - part 711

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-254

STEP 16. Check the CAN_L and H lines (communication 
lines including the SRS-ECU) between joint connector (3) 
and the SRS-ECU for a short circuit. Measure the 
resistance at joint connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02, and measure the 

resistance at the wiring harness side of joint connector (3) 
C-02.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between joint connector (3) 

terminals 3 and 14.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

20 if vehicle has multi-centre display or go to Step 24 
if vehicle not equipped with multi-centre display .

NO :  If the resistance measures less than 1 k

Ω, go to Step 

17.

16DB408A

CONNECTOR: C-02

AC209438

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS

AV

TEST 

HARNESS

HARNESS SIDE: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-255

STEP 17. Check the CAN_L and H lines (communication 
lines only) between the SRS-ECU connector and joint 
connector for a short circuit. Measure the resistance at 
joint connector C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector C-02 and SRS-ECU connector 

C-121, and measure the resistance at the wiring harness 
side of joint connector C-02.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between intermediate connector 

terminals 3 and 14.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

18  .

NO :  If the resistance measures less than 1 k

Ω, repair the 

wiring harness between joint connector C-02 and 
SRS-ECU connector.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

16DB408A

CONNECTOR: C-02

AC209438

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS

AV

TEST 

HARNESS

HARNESS SIDE: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-256

STEP 18. Check SRS-ECU connector C-121 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-4

.

Q: Is SRS-ECU connector C-121 in good condition?

YES : Go to Step 19.
NO :  Repair the damaged parts.

STEP 19. Check the SRS-ECU for short circuit. Measure 
the resistance at SRS-ECU connector C-121.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

(1) Disconnect SRS-ECU connector C-121, and measure the 

resistance at the component side of SRS-ECU connector 
C-121.

(2) Measure the resistance between SRS-ECU connector 

terminals 32 and 43.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, diagnose 

CAN bus lines thoroughly by referring to 

P.54C-323

.

NO :  If the resistance measures less than 1 k

Ω, replace the 

SRS-ECU.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

AC209438

48

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

AC209438

TEST 
HARNESS

AU

TEST 

HARNESS

COMPONENT SIDE: C-121

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-257

STEP 20. Check the CAN_L and H lines (communication 
lines including the multi-center display unit ) between joint 
connector (3) and the middle-grade multi-center display 
for a short circuit. Measure the resistance at joint 
connector (3) C-02.

NOTE: If vehicle not equipped with multi-centre display go 
to Step 24

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02, and measure the 

resistance at the wiring harness side of joint connector (3) 
C-02.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between joint connector (3) 

terminals 8 and 19.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

24  .

NO :  If the resistance measures less than 1 k

Ω, go to Step 

21.

STEP 21. Check multi-center display unit  connector C-05 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-4

.

Q: Is multi-center display unit  connector C-05 in good 

condition?
YES : Go to Step 22.
NO :  Repair the damaged parts.

16DB408A

CONNECTOR: C-02

AC209438

AC209438

TEST 
HARNESS

AW

TEST 

HARNESS

1110 9 8 7 6 5 4 3 2 1
22 21201918 171615141312

HARNESS SIDE: C-02

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)