Mitsubishi 380. Manual — part 792

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-92

STEP 3. Using diagnostic tool MB991958, read the
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOOK (OFF)" position.

Q: Is DTC B1519 set?

YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Check SRS-ECU connector D-26.
Q: Is the connector correctly engaged?

YES : Go to Step 5.
NO : Engage the connector correctly. Then go to Step 9.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

24DB063A

CONNECTOR: D-26

SRS-ECU

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

D-26 (Y)

D-26 FLOOR

HARNESS

CONNECTOR

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-93

STEP 5. Check SRS-ECU connector D-26 and side-airbag
module (RH) connector D-32. (Using diagnostic tool
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors D-26 and D-32, and then reconnect

them.

(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code memory, and check the

diagnostic trouble code.

Q: Is DTC B1420 out put?

YES : Go to Step 6.
NO : The procedure is complete. It is assumed that DTC

B1420 set because connector D-26 or D-32 was
engaged improperly.

AC307779

D-32 (R)

AD

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

CONNECTOR : D-32

24DB063A

CONNECTOR: D-26

SRS-ECU

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

D-26 (Y)

D-26 FLOOR

HARNESS

CONNECTOR

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-94

STEP 6. Check the side-airbag module (RH). (Using
diagnostic tool MB991958, read the diagnostic trouble
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (RH) connector D-32.

(3) Connect special tool MB991865 to special tool MB991866.

CAUTION

Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the D-32 harness side

connector by testprobe.

(5) Connect the negative battery terminal.
(6) Erase the diagnostic trouble code memory, and check the

diagnostic trouble code.

Q: Is DTC B1420 set?

YES : Go to Step 7.
NO : Replace the seatback frame of the front seat (RH)

(Refer to GROUP 52A, Front Seat

P.52A-33

). Then

go to Step 9.

AC307779

D-32 (R)

AD

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

CONNECTOR : D-32

AC006042BO

MB991866

(RESISTOR HARNESS)

D-32 HARNESS SIDE

CONNECTOR

D-32 SIDE-AIRBAG

MODULE (RH) CONNECTOR

MB991865 (DUMMY
RESISTOR: 3

Ω)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-95

STEP 7. Check the side-airbag module (RH) circuit.
Measure the resistance at the SRS-ECU connector D-26.
(1) Disconnect SRS-ECU connector D-26.

DANGER

To prevent the air bag from deploying unintentionally,
disconnect the side-airbag module (RH) connector
D-32 to short the squib circuit.

(2) Disconnect side-airbag module connector D-32.

CAUTION

Insert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.
(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)

thick] between terminals 57, 58 and the short spring to
release the short spring.

(4) 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.
(5) Check for continuity between D-26 harness side connector

terminals 57 and 58.
It should be open circuit.

Q: Does continuity exist?

YES : Go to Step 8.
NO : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1420 sets,
replace the SRS-ECU (Refer to

P.52B-234

). Then go

to Step 7.

24DB063A

CONNECTOR: D-26

SRS-ECU

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

D-26 (Y)

D-26 FLOOR

HARNESS

CONNECTOR

(REAR VIEW)

AC307779

D-32 (R)

AD

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

CONNECTOR : D-32

24DB069A

D-26 HARNESS SIDE

CONNECTOR (FRONT VIEW)

TERMINAL

CABLE
TIE

SECT-

ION

A - A

4 mm (0.16 inch) OR MORE

SHORT SPRING

A

A

24DB070A

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

D-26 HARNESS SIDE

CONNECTOR

(REAR VIEW)