Mitsubishi Galant (2004+). Manual - part 1590

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-253

STEP 5. Measure the voltage at passenger’s seat belt 
warning light connector C-07.

(1) Disconnect passenger’s seat belt warning light connector 

C-07.

(2) Measure the voltage between C-07 harness side connector 

terminal 1 and body ground.
Voltage should measure approximately 12 volt.

Q: Is the check result satisfactory?

YES : Go to Step 7 .
NO :  Go to Step 6 .

STEP 6. Check the harness for short circuit between 
ignition switch connector C-308 (terminal No.2) and 

passenger’s seat belt warning light C-07 (terminal No.1).

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

AC308201

C-07 HARNESS SIDE
CONNECTOR

AB

AC305235AG

CONNECTOR: C-308

C-308

2
5

4

1

6

3

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-254

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

P.00E-2

. Then 

go to Step 10   .
Q: Are the harness wires between Ppassenger’s seat belt 

warning light connector C-07 (terminal No.1) and the 
ignition switch connector C-308 (terminal No.2) in good 
condition?
YES : Go to Step 7 .
NO :  Repair the harness wires. Then go to Step 10 .

STEP 7. Check SRS-ECU connector C-121.

Q: Is the connector correctly engaged?

YES : Go to Step 8 .
NO :  Engage the connector correctly. Then go to Step 10 .

AC305416

CONNECTORS: C-211, C-215

JUNCTION BLOCK 
(FRONT VIEW)

C-215

C-211

HARNESS SIDE

C-211

HARNESS SIDE

C-215

AK

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-255

STEP 8. Check the harness for short circuit between 
passenger’s seat belt warning light C-07 (terminal No.3) 
and SRS-ECU connector C-121 (terminal No.42).

NOTE: After inspecting intermediate connector C-22 inspect 
the wiring harness. If intermediate connector C-22 is damaged, 
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection 

P.00E-2

. Then go to Step 10  .

Q: Are the harness wires between SRS-ECU connector 

C-121 (terminal No.42) and the passenger’s seat belt 
warning light C-07 (terminal No.3) in good condition?
YES : Go to Step 9 .
NO :  Repair the harness wires. Then go to Step 10 .

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

AC305362

CONNECTOR: C-121

C-121 (Y)

AH

SRS-ECU

C-121
HARNESS SIDE 
CONNECTOR
(REAR VIEW)

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

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-256

STEP 9. Check the passenger’s seat belt warning light.

(1) Disconnect the negative battery terminal.
(2) Disconnected the SRS-ECU connector C-121, and 

measure at the wiring harness side.

(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(5) Connect terminal No.42 to ground.
Q: Does the warning light illuminate?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1487 set, 
replace the SRS-ECU. (Refer to 

P.52B-365

). Go to 

Step 10 .

NO :  Replace the passenger’s seat belt warning light 

(Refer to GROUP 52A, Instrument Panel Assembly 

P.52A-3

). 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 B1487 set?

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

AC305362

CONNECTOR: C-121

C-121 (Y)

AH

SRS-ECU

C-121
HARNESS SIDE 
CONNECTOR
(REAR VIEW)

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

AC308203

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

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827