Mitsubishi 380. Manual - part 809

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-160

STEP 3. Check the driver's seat belt pre-tensioner. (Using 
diagnostic tool MB991958, read the diagnostic trouble 
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect driver's seat belt pre-tensioner connector D-33. 

Use a flat-tipped screwdriver to unlock the locking button at 
the harness side connector by withdrawing it toward you in 
two stages, and then disconnect the connector.

(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-33 harness side 

connector.

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

diagnostic trouble code.

Q: Is DTC B1461 set?

YES : Go to Step 4.
NO :  Replace the passenger's seat belt pre-tensioner 

(Refer to 

P.52B-250

). Then go to Step 5.

AC307915AC

CONNECTOR: D-33

D-33 (B)

FORWARD

CENTER 
PILLAR

HARNESS SIDE
CONNECTOR
(FRONT VIEW)

2 1

MB991884

MB991885

AC103283AP

MB991865
(DUMMY RESISTOR : 3Ω)

MB991884
(RESISTOR 
HARNESS)

D-33  HARNESS SIDE 
CONNECTOR

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-161

STEP 4. Check the harness for open circuit between 
SRS-ECU connector D-26 (terminal No.59 and 60) and the 
driver's seat belt pre-tensioner connector D-33 (terminal 
No.1 and 2).
(1) Disconnect SRS-ECU connector D-26 and driver's seat belt 

pre-tensioner connector D-33. For connector D-33, use a 
flat-tipped screwdriver to unlock the locking button at the 
harness side connector by withdrawing it toward you in two 
stages, and then disconnect the connector.

(2) Connect D-33 harness side connector to special tool 

MB991884.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(3) Check for continuity between the following terminals. It 

should be less than 2 ohms. 

• SRS-ECU connector D-26 (terminal No.59) and the spe-

cial tool (terminal No.1)

• SRS-ECU connector D-26 (terminal No.60) and the spe-

cial tool (terminal No.2)

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1461 sets, 
replace the SRS-ECU (Refer to 

P.52B-234

). Then go 

to Step 5.

NO :  Replace the harness wires between SRS-ECU 

connector D-26 driver’s seat belt pre-tensioner 

AC307915AC

CONNECTOR: D-33

D-33 (B)

FORWARD

CENTER 
PILLAR

HARNESS SIDE
CONNECTOR
(FRONT VIEW)

2 1

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)

AC201287AU

D-33 
HARNESS SIDE 
CONNECTOR

MB991884

24DB081A

2

1

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

D-26 FLOOR HARNESS 

SIDE CONNECTOR

(REAR VIEW)

<D-33 HARNESS SIDE

CONNECTOR>

SPECIAL TOOL 

MB991884

(FRONT VIEW)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-162

connector D-33. Then go to Step 5.

STEP 5. 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 B1461 set?

YES : Return to Step 1. 
NO :  The procedure is complete. 

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-163

DTC B1462: Seat Belt Pre-Tensioner (RH) (Squib) System Fault for Power Supply Circuit 
(Short-Circuited to Power Supply)

CAUTION

If DTC B1462 is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

CIRCUIT OPERATION

The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analog G-sensor. If the impact is 
over a predetermined level, the SRS-ECU sends an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the pre-tensioner will deploy. 

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the driver's seat belt 
pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• Damaged wiring harnesses or connectors

• Short to the power supply in the driver's seat belt 

pre-tensioner (squib) harness

• Malfunction of the SRS-ECU

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

.

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)

AC307915AB

CONNECTOR: D-33

D-33 (B)

FORWARD

CENTER 
PILLAR