Mitsubishi Galant (2004+). Manual - part 1605

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-313

STEP 3. Check the driver’s seat belt switch.

AC305264

AS

CONNECTOR: D-28

D-28 (B)

HARNESS SIDE

AC308221AB

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

BUCKLE

TONGUE

AC308214AB

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

AC308219AB

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-314

Disconnect driver’s seat belt switch connector D-28. Then 
check continuity between the switch terminals.

Q: Is driver’s seat belt switch in good condition?

YES : Go to Step 4.
NO :  Replace inner seat belt. (Refer to GROUP 52A, Front 

Seat Belt 

P.52A-33

.)

ITEM

TESTER 
CONNECTION

STANDARD 
VALUE

SPECIFIED 
CONDITION

Fastened seat 
belt

3 

− 5

820 

± 20 Ω

−

3 

− Ground

−

No continuity

5 

− Ground

−

No continuity

Unfastened 
seat belt

4 

− 5

820 

± 20 Ω

−

4 

− Ground

−

No continuity

5 

− Ground

−

No continuity

AC308215

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

AB

AC308218 AB

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-315

STEP 4. Check the driver’s seat belt switch circuit D-28. 
Measure the resistance at SRS-ECU connector C-122.

(1) Disconnect driver’s seat belt switch connector D-28.

(2) Install the driver’s seat belt to the driver’s seat belt switch.

(3) Disconnect SRS-ECU connector C-122 and measure at the 

harness side (rear side).

(4) Measure the resistance between terminal 3 and  4.

Resistance should be 820 

± 82 Ω

AC305264

AS

CONNECTOR: D-28

D-28 (B)

HARNESS SIDE

AC308221AD

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

BUCKLE

TONGUE

AC305362

CONNECTOR: C-122

C-122 (Y)

AI

SRS-ECU

C-122 
Harness side
connector 
(rear view)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

AC308212

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-316

(5) Remove the driver’s seat belt from the driver’s seat belt 

switch.

(6) Disconnect SRS-ECU connector C-122 and measure at the 

harness side (rear side).

(7) Measure the resistance between terminal 18 and  4.

Resistance should be 820 

± 82 Ω

Q: Does the resistance meet the value above?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1530, B1531, 
B1532, B1533, B1534, B1535, B1536, B1537, B1538 
or B1539 are set, replace the SRS-ECU. (Refer to 

P.52B-365

.) Then go to Step 6. 

NO :  Go to Step 5.

AC308221AC

D-28 DRIVER'S 
SEAT BELT SWITCH
CONNECTOR

BUCKLE

TONGUE

AC305362

CONNECTOR: C-122

C-122 (Y)

AI

SRS-ECU

C-122 
Harness side
connector 
(rear view)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

AC308213

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AB