Mitsubishi 380. Manual - part 800

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-124

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-27.
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

24DB064A

CONNECTOR: D-27

SRS-ECU

D-27 (Y)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

D-27 Floor 

harness

connector

(rear view)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-125

STEP 5. Check SRS-ECU connector D-27 and side-airbag 
module (LH) connector D-24. (Using diagnostic tool 
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors D-27 and D-24, 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 B1430 out put?

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

B1430 set because connector D-27 or D-24 was 
engaged improperly.

AC307778

CONNECTOR : D-24

AC

D-24 (R)

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

24DB064A

CONNECTOR: D-27

SRS-ECU

D-27 (Y)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

D-27 Floor 

harness

connector

(rear view)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-126

STEP 6. Check the side-airbag module (LH). (Using 
diagnostic tool MB991958, read the diagnostic trouble 
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (LH) connector D-24.

(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-24 harness side 

connector by testprobe.

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

diagnostic trouble code. 

Q: Is DTC B1430 set?

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

(Refer to GROUP 52A, Front Seat 

P.52A-33

). Then 

go to Step 9.

AC307778

CONNECTOR : D-24

AC

D-24 (R)

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC006042BP

MB991866
(RESISTOR HARNESS)

D-24 HARNESS SIDE
CONNECTOR

D-24 SIDE-AIRBAG 

MODULE (LH) CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3

 

Ω)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-127

STEP 7. Check the side-airbag module (LH) circuit. 
Measure the resistance at the SRS-ECU connector D-27.
(1) Disconnect SRS-ECU connector D-27.

DANGER

To prevent the air bag from deploying unintentionally, 
disconnect the side-airbag module (LH) connector 
D-24 to short the squib circuit.

(2) Disconnect left hand side-airbag module (LH) connector 

D-24.

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 9, 10 and the short spring to 
release the short spring.

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 D-27 harness side connector 

terminals 9 and 10.
It should be open circuit.

Q: Is the circuit normal? 

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1430 sets, 
replace the SRS-ECU (Refer to 

P.52B-234

). Then go 

to Step 9. 

NO :  Go to Step 8. 

AC307778

CONNECTOR : D-24

AC

D-24 (R)

2

1

HARNESS SIDE
CONNECTOR
(REAR VIEW)

24DB064A

CONNECTOR: D-27

SRS-ECU

D-27 (Y)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

D-27 Floor 

harness

connector

(rear view)

24DB074A

A

A

D-27 FLOOR HARNESS SIDE

CONNECTOR (FRONT VIEW)

TERMINAL

SHORT SPRING

4 mm (0.16 inch) OR MORE

SEC-
TION
A - A

CABLE TIE

24DB075A

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

D-27 FLOOR HARNESS

SIDE CONNECTOR

(REAR VIEW)