Mitsubishi 380. Manual - part 819

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-200

STEP 5. Check the harness for open circuit between 
SRS-ECU connector C-121 (terminal No.23 <DTC B1476> 
or terminal No.24 <DTC B1477>) and the ignition switch 
connector C-308 (terminal No.2).

NOTE: After inspecting intermediate connectors , C-211 and 
C-215, inspect the wiring harness. If intermediate connectors 
are damaged, repair or replace wiring harness. Refer to 
GROUP 00E, Harness Connector Inspection . Then go to Step 
10.

Q: Is the harness wire between SRS-ECU connector C-121 

(terminal No.23 <DTC B1476> or terminal No.24 <DTC 
B1477>) and the ignition switch connector C-308 
(terminal No.2) in good condition?
YES : Go to Step 10.
NO :  Replace the harness wire between SRS-ECU 

connector C-121 and the ignition switch connector 
C-308. Then go to Step 10.

35DB042A

CONNECTOR: C-308

C-308

2

5

4

1

6

3

24DB062A

CONNECTOR: C-121

C-121 (Y)

SRS-ECU

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

43

35

46

24

B

A

C-121

INSTRUMENT

HARNESS

CONNECTOR

(REAR VIEW)

52DB021A

CONNECTORS: C-211, C-215

HARNESS SIDE

C-211

HARNESS SIDE

C-215

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-201

STEP 6. Check a burned-out fuse.
(1) Replace the fuse.
(2) Turn the ignition switch to the "ON" position, wait for at least 

one minute and then turn the ignition switch to the "LOCK" 
(OFF) position. 

(3) Check the fuse.

Q: Is the fuse in good condition?

YES : Go to Step 10.
NO :  It is possible that the circuit using fuse No18 <DTC 

B1476> or No.19 <DTC B1477> is shorted, go to Step 
7.

STEP 7. Check the SRS-ECU power supply circuit for short 
circuit to ground. Measure the resistance at the junction 
block connector C-211.
(1) Disconnect junction block connector C-211, and measure at 

the wiring harness side.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(2) Check for continuity between terminal 7 <DTC B1476> or 

24 <DTC B1477> and body ground.
It should be open circuit.

Q: Does continuity exist?

YES : Check the other circuit, which flows through fuse 

No.18 <DTC B1476> or fuse No.19 <DTC 
B1477>.Then go to Step 10.

NO :  Go to Step 8.

AC308200

1 2 3 4 5 6 7 8 9 10 11121314

151617181920 2122232425262728

C-211 HARNESS SIDE
CONNECTOR (REAR VIEW)

AB

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-202

STEP 8. Check the power supply circuit for short circuit to 
ground. Measure the resistance at the SRS-ECU connector 
C-121.
(1) Disconnect SRS-ECU connector C-121, and measure at 

the wiring harness side.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(2) Check for continuity between terminal 23 <DTC B1476> or 

24 <DTC B1477> and body ground.
It should be open circuit.

Q: Does continuity exist?

YES : Go to Step 9.
NO :  Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1476 or B1477 
sets, replace the SRS-ECU (Refer to 

P.52B-234

). 

Then go to Step 10.

STEP 9. Check the harness for short circuit to ground 
between SRS-ECU connector C-121 (terminal No.23 <DTC 
B1476> or terminal No.24 <DTC B1477>) and junction 
block connector C-211 (terminal No.7 <DTC B1476> or 
terminal No.24 <DTC B1477> ).

24DB062A

CONNECTOR: C-121

C-121 (Y)

SRS-ECU

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

43

35

46

24

B

A

C-121

INSTRUMENT

HARNESS

CONNECTOR

(REAR VIEW)

AC308195

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

43

35

46

24

B

A

C-121 HARNESS SIDE
CONNECTOR (REAR VIEW)

AB

24DB062A

CONNECTOR: C-121

C-121 (Y)

SRS-ECU

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

43

35

46

24

B

A

C-121

INSTRUMENT

HARNESS

CONNECTOR

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-203

NOTE: 2, Inspect the wiring harness. If intermediate connec-
tors are damaged, repair or replace wiring harness. Refer to 
GROUP 00E, Harness Connector Inspection . Then go to Step 
10.

Q: Is the harness wire between SRS-ECU connector C-121 

(terminal No.23 <DTC B1476> or terminal No.24 <DTC 
B1477>) and junction block connector C-211 (terminal 
No.7 <DTC B1476> or 24 <DTC B1477>) in good 
condition?
YES : Go to Step 10.
NO :  Replace the harness wire between SRS-ECU 

connector C-121 and junction block connector C-211. 
Then go to Step 10.

STEP 10. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC B1476 or DTC B1477 set?

YES : Return to Step 1.
NO :  The procedure is complete.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827