Mitsubishi Galant 9G. Manual — part 1461

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-254

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 . Th
en 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-255

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

). Then go

to Step 10.

NO : Replace the passenger’s seat belt warning 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 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

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-256

DTC B1487: Passenger’s seat belt warning Light Drive Circuit System Fault 1 (Light does not Switch
Off).

Seat Belt Warning Light Drive Circuit

SRS-ECU

IGNITION
SWITCH (IG1)

JUNCTION
BLOCK

SEAT BELT
WARNING
LIGHT
(PASSEGER'S SIDE)

RELAY
BOX

JOINT
CONNECTOR (1)

TAILLIGHT
RELAY

FRONT ECU

JUNCTION
BLOCK

SEAT BELT
WARNING LIGHT
DRIVE CIRCUIT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-257

CAUTION

If DTC B1487 is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

CIRCUIT OPERATION

• Power for the passenger’s seat belt warning light

is supplied from the ignition switch (IG1).

• The passenger’s seat belt warning light illumi-

nates when the ignition switch is turned to the
"ON" position and goes out after approximately
seven seconds if there is not a malfunction in the
SRS system.

• If a failure occurs in the system, the SRS-ECU

will stop sending that SRS warning light "OFF"
signal, thus causing the combination meter to illu-
minate the SRS warning light.

• The SRS warning light "OFF" signal is not sent to

the combination meter in the cases below, either.
Therefore, the combination meter will illuminate
the SRS warning light.

• The SRS-ECU connector is disconnected.

• The SRS-ECU is not working normally due to

a failure in its power supply lines.

• The wiring harness between the passenger’s

seat belt warning light and the SRS-ECU is
broken.

.

DTC SET CONDITIONS

This DTC will be set if an open circuit has occurred in
the wiring harness between the passenger’s seat
belt warning light and the SRS-ECU. If the vehicle
condition returns to normal, DTC B1487 will be auto-
matically erased, and the passenger’s seat belt
warning light will go out.

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

• Malfunction of the passenger’s seat belt warning

light

.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN

Communication System)

AC305233CY

CONNECTOR: C-07

AC305233 AO

CONNECTOR: C-22

C-22 (Y)

AC305362

CONNECTOR: C-121

C-121 (Y)

AD

SRS-ECU

AC305415

CONNECTORS : C-211, C-215

C-211

C-215

AZ

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Текст

Политика конфиденциальности