Mitsubishi Galant (2004+). Manual - part 1603

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-305

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

AC305264

AT

CONNECTOR: D-29

HARNESS SIDE

AC308036 AB

AC308224

D-29 PASSENGER'S 
SEATBELT SWITCH 
CONNECTOR

AB

AC308222

D-29 PASSENGER'S 
SEATBELT SWITCH 
CONNECTOR

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-306

Disconnect passenger’s seat belt switch connector D-29. Then 
check continuity between the switch terminals.

Q: Is passenger’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

1 

− 3

820 

± 20 Ω

−

1 

− Ground

−

No continuity

3 

− Ground

−

No continuity

Unfastened 
seat belt

2 

− 3

820 

± 20 Ω

−

2 

− Ground

−

No continuity

3 

− Ground

−

No continuity

AC308225

D-29 PASSENGER'S 
SEATBELT SWITCH 
CONNECTOR

AB

AC308223

D-29 PASSENGER'S 
SEATBELT SWITCH 
CONNECTOR

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-307

STEP 4. Check the passenger’s seat belt switch circuit 
D-29. Measure the resistance at SRS-ECU connector 
C-120.

(1) Disconnect passenger’s seat belt switch connector D-29.

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

(3) Disconnect SRS-ECU connector C-120 and measure at the 

harness side (rear side).

AC305264

AT

CONNECTOR: D-29

HARNESS SIDE

AC308611 AD

D-29 PASSENGER'S 
SEAT BELT SWITCH
CONNECTOR

BUCKLE

TONGUE

AC305362

CONNECTOR: C-120

C-120 (Y)

AG

SRS-ECU

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

C-120 
Harness side
connector 
(rear view)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-308

(4) Measure the resistance between terminal 52 and terminal 

51.

Resistance should be 820 

± 82 Ω

(5) Remove the passenger’s seat belt from the seat belt switch.

(6) Disconnect SRS-ECU connector C-120 and measure at the 

harness side (rear side).

(7) Measure the resistance between terminal 65 and terminal 

51.

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 B1520, B1521, 
B1522, B1523, B1524, B1525, B1526, B1527, B1528 
or B1529 are set, replace the SRS-ECU. (Refer to 

P.52B-365

.) Then go to Step 6. 

NO :  Go to Step 5.

AC305362

CONNECTOR: C-120

C-120 (Y)

AG

SRS-ECU

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

C-120 
Harness side
connector 
(rear view)

AC308227

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AB

AC308611 AC

D-29 PASSENGER'S 
SEAT BELT SWITCH
CONNECTOR

BUCKLE

TONGUE

AC305362

CONNECTOR: C-120

C-120 (Y)

AG

SRS-ECU

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

C-120 
Harness side
connector 
(rear view)

AC308228

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AB