Mitsubishi Galant 9G. Manual — part 1465

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-270

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 . Then go to
Step 10.

Q: Are the harness wires between passenger’s air bag OFF

indicator light connector C-06 (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

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

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23

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32

43

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24

B

A

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-271

STEP 8. Check the harness for short circuit between
passenger’s air bag OFF indicator light C-06 (terminal
No.3) and SRS-ECU connector C-121 (terminal No.21).

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 . Then go to Step 10.

Q: Are the harness wires between SRS-ECU connector

C-121 (terminal No.21) and the passenger’s air bag OFF
indicator light C-06 (terminal No.3) in good condition?
YES : Go to Step 9.
NO : Repair the harness wires. Then go to Step 10.

AC305233CX

CONNECTOR: C-06

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

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24

B

A

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-272

STEP 9. Check the passenger’s air bag OFF indicator 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.21 to ground.

Q: Does the indicator light illuminate?

YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1489 set,
replace the SRS-ECU (Refer to

P.52B-365

). Then go

to Step 10.

NO : Replace the passenger’s air bag OFF indicator light

(Refer to GROUP 52A, Instrument Panel Assembly

P.52A-3

). 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 B1489 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

AC308206

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

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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

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-273

DTC B1489: Passenger’s Air Bag OFF Indicator Light Drive Circuit System Fault 1 (Light does not
Switch Off).

SRS-ECU

IGNITION
SWITCH (IG1)

JUNCTION
BLOCK

AIR BAG OFF
INDICATOR
LIGHT
(PASSEGER'S SIDE)

RELAY
BOX

JOINT
CONNECTOR (1)

TAILLIGHT
RELAY

FRONT ECU

AIR BAG OFF
INDICATOR LIGHT
DRIVE CIRCUIT

JUNCTION
BLOCK

Air Bag OFF Indicator Light Drive Circuit