Mitsubishi Galant (2004+). Manual - part 1554

 

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Mitsubishi Galant (2004+). Manual - part 1554

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-109

STEP 4. Check the passenger's air bag module circuit. 
Measure the resistance at the SRS-ECU connector C-121.

(1) Disconnect SRS-ECU connector C-121.

DANGER

To prevent the air bag from deploying unintentionally, 
disconnect the passenger’s air bag module connec-
tor C-110 to short the squib circuit.

(2) Unclip passenger’s air bag module connector C-110.
(3) Disconnect the passenger's air bag module connector 

C-110.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(4) Check for continuity between C-121 harness side connector 

terminals 27 and 28 <1st squib> or 30 and 31 <2nd squib>, 
and body ground.
It should be open circuit.

Q: Does continuity exist? 

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1413 <1st 
squib> B1493 <2nd squib> sets, replace the 
SRS-ECU. (Refer to 

P.52B-365

). Then go to Step 6.

NO :  Go to Step 5.

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

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24

B

A

AC307137AC

C-110 (Y)

FRONT DECK
CROSSMEMBER

CONNECTOR: C-110

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

AC301592

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

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24

B

A

C-121 HARNESS SIDE 
CONNECTOR (REAR VIEW)

<1ST SQUIB>

AC

AC308154

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

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24

B

A

C-121 HARNESS SIDE 
CONNECTOR (REAR VIEW)

<2ND SQUIB>

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-110

STEP 5. Check the harness wires for short circuit to 
ground between SRS-ECU connector C-121 (terminal 
No.27 and 28 <1st squib> or terminal No.30 and 31 <2nd 
squib>) and passenger's air bag module connector C-110 
(terminal No.1 and 2 <1st squib> or terminal No.4 and 3 
<2nd squib>).

NOTE: After inspecting intermediate connector C-22 inspect 
the wiring harness. If the intermediate connector C-22 is dam-
aged, repair or replace it.
Q: Are the harness wires between SRS-ECU connector 

C-121 (terminal No.27 and 28 <1st squib> or terminal 
No.30 and 31 <2nd squib>) and passenger's air bag 
module connector C-110 (terminal No.1 and 2 <1st 
squib> or terminal No.4 and 3 <2nd squib>) in good 
condition? 
YES : 
Go to Step 6.
NO :  Replace the harness wires between SRS-ECU 

connector C-121 and passenger's air bag module 
connector C-110. Then go to Step 6.

AC307137AC

C-110 (Y)

FRONT DECK
CROSSMEMBER

CONNECTOR: C-110

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

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

C-22 (Y)

CO

CONNECTOR: C-22

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-111

STEP 6. 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 B1413 <1st squib> B1493 <2nd squib> set?

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

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-112

DTC B1417: Front Impact Sensor (LH) Power Supply Circuit System

INTERFACE CIRCUIT

SRS-ECU

FRONT IMPACT 
SENSOR (LH)

FRONT IMPACT 
SENSOR (RH)

Front Impact Sensor Circuit

AC305210

CONNECTOR: A-23

AW

A-23 (Y)

AC305233 AO

CONNECTOR: C-22

C-22 (Y)

AC305231BF

CONNECTOR: C-29

AC305362

CONNECTOR: C-121

C-121 (Y)

AD

SRS-ECU

 

 

 

 

 

 

 

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