Mitsubishi Grandis. Manual - part 1022

 

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Mitsubishi Grandis. Manual - part 1022

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-140

STEP 3. Check the seat belt pre-tensioner (RH). 
(MUT-III diagnosis code.)
(1) Disconnect the negative battery terminal.

(2) Disconnect seat belt pre-tensioner (RH) 

connector D-32. 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 dummy resistor (MB991865) 

to special tool resistor harness (MB991884).

(4) Connect special tool MB991884 to the D-32 

harness side connector.

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

the diagnosis code.

Q: Is diagnosis code B1463 set?

YES : 

Go to Step 4.

NO : 

Replace the seat belt pre-tensioner (RH) 
(Refer to 

P.52B-239

).

STEP 4. Check the passenger's seat belt 
pre-tensioner circuit. Voltage measurement at the 
SRS-ECU connector C-118.

(1) Disconnect SRS-ECU connector C-118.

(2) Disconnect seat belt pre-tensioner (RH) 

connector D-32. 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.

AC302394AC

 D-32 (B)

Connector: D-32

Centre
pillar

Front vehicle

Harness side
(front view)

AC103556AX

Locking button

Flat-tip screw
driver

D-32 Harness
side connector

D-32 Seat belt
pre-tensioner (RH)
connector

MB991884
MB991885

AC103283AU

MB991865
(Dummy resistor : 3

Ω)

MB991884
(Resistor
harness)

D-32  Harness side
connector

AC311438 AC

C-118 (Y)

Connector: C-118

Harness side
(front view)

AC302394AC

 D-32 (B)

Connector: D-32

Centre
pillar

Front vehicle

Harness side
(front view)

AC103556AX

Locking button

Flat-tip screw
driver

D-32 Harness
side connector

D-32 Seat belt
pre-tensioner (RH)
connector

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-141

(3) Turn the ignition switch to the "ON" position,

CAUTION

Do not insert a test probe into the terminal from 
its front side directly, as the connector contact 
pressure may be weakened.
(4) Measure the voltage between C-118 harness 

side connector terminals 59, 60 and body earth.

OK: 0 V

Q: Is the measured voltage within the specified 

range?

YES : 

Go to Step 5.

NO : 

Repair the harness wire between SRS-ECU 
connector C-118 (terminal No.59 and 60) 
and seat belt pre-tensioner (RH) connector 
D-32 (terminal No.1 and 2).

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1463 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-223

). 

NO : 

An intermittent malfunction is suspected 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-5

). 

AC301577

63

55

51

69

61

66

58

65

64

56 57

68

60

67

59

70

62

53

52 B

A

54

AF

C-118 Harness side
connector (rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-142

Code No.B1404: Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Short 
Circuit
Code No.B1405: Driver's Air Bag Module (1st Squib Ignition Drive Circuit) System Detected Open 
Circuit
Code No.B1414: Passenger’s (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System 
Detected Short Circuit
Code No.B1415: Passenger’s (Front) Air Bag Module (1st Squib Ignition Drive Circuit) System 
Detected Open Circuit
Code No.B1424: Side-Airbag Module (RH) (Squib) System Detected Short Circuit
Code No.B1425: Side-Airbag Module (RH) (Squib) System Detected Open Circuit
Code No.B1434: Side-Airbag Module (LH) (Squib) System Fault 3 for Ignition Drive Circuit
Code No.B1435: Side-Airbag Module (LH) (Squib) System Fault 4 for Ignition Drive Circuit
Code No.B1444: Curtain air bag Module (RH) (Squib) System Fault 3 for Ignition Drive Circuit
Code No.B1445: Curtain air bag Module (RH) (Squib) System Fault 4 for Ignition Drive Circuit
Code No.B1454: Curtain air bag Module (LH) (Squib) System Fault 3 for Ignition Drive Circuit
Code No.B1455: Curtain air bag Module (LH) (Squib) System Fault 4 for Ignition Drive Circuit
Code No.B1464: Seat Belt Pre-tensioner (RH) (Squib Ignition Drive Circuit) System Detected Short 
Circuit
Code No.B1465: Seat Belt Pre-tensioner (RH) (Squib Ignition Drive Circuit) System Detected Open 
Circuit
Code No.B1466: Analog G-Sensor System in the SRS-ECU
Code No.B1467: Safing G-Sensor Open Circuit
Code No.B1468: Safing G-Sensor Short Circuit
Code No.B1469: Safing G-Sensor for Side Air Bag Faults
Code No.B1474: Seat Belt Pre-tensioner (LH) (Squib Ignition Drive Circuit) System Detected Short 
Circuit
Code No.B1475: Seat Belt Pre-tensioner (LH) (Squib Ignition Drive Circuit) System Detected Open 
Circuit
Code No.B1478: SRS-ECU Capacitor Circuit Voltage too High
Code No.B1479: SRS-ECU Capacitor Circuit Voltage too Low
Code No.B1484: Driver's Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Short 
Circuit
Code No.B1485: Driver's Air Bag Module (2nd Squib Ignition Drive Circuit) System Detected Open 
Circuit
Code No.B1494: Passenger’s (Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System 
Detected Short Circuit
Code No.B1495: Passenger’s (Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System 
Detected Open Circuit
Code No.B1496: SRS-ECU Non-Volatile Memory (EEPROM)
Code No.B1497: SRS-ECU ASIC (for frontal activation)
Code No.B1498: SRS-ECU ROM or RAM
Code No.B1548: CAN Communication Malfunction
Code No.B1549: CAN Communication error
Code No.B1552: Changing Circuit shorted
Code No.B1553: Changinmg Circuit open
Code No.B1554: SG BY-PASS Circuit Malfunction
Code No.B1555: SG BY-PASS Circuit (FET) Open
Code No.B1557: SRS-ECU ASIC

CAUTION

If diagnosis codes is set in the SRS-ECU, always 
diagnose the CAN main bus line.

DIAGNOSIS CODE SET CONDITIONS

• These diagnosis code are set when a fault is 

detected in the SRS-ECU. The most likely 
causes for this code to be set are shown in the 
table below:

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-143

PROBABLE CAUSE

• Malfunction of the SRS-ECU

Code No.

Part/Circuit integral to 
SRS-ECU

Trouble causes

B1404

Driver's air bag module (1st squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1405

• Open circuit in the squib ignition drive circuit

B1414

Front passenger's air bag module 
(1st squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1415

• Open circuit in the squib ignition drive circuit

B1424

Side-airbag module (RH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1425

• Open circuit in the squib ignition drive circuit

B1434

Side-airbag module (LH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1435

• Open circuit in the squib ignition drive circuit

B1444

Curtain air bag module (RH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1445

• Open circuit in the squib ignition drive circuit

B1454

Curtain air bag module (LH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1455

• Open circuit in the squib ignition drive circuit

B1464

Seat belt pre-tensioner (RH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1465

• Open circuit in the squib ignition drive circuit

B1466

Analog G-sensor

• When the analog G-sensor is not operating

• When the characteristics of the analog G-sensor are 

abnormal

• When the output from the analog G-sensor is 

abnormal

B1467

Safing G-sensor (front air bag)

• Open circuit in the safing G-sensor

B1468

• Short circuit in the safing G-sensor

B1469

Safing G-sensor (side-airbag)

• When the safing G-sensor is not operating

• When the characteristics of the safing G-sensor are 

abnormal

• When the output from the safing G-sensor is abnormal

B1474

Seat belt pre-tensioner (LH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1475

• Open circuit in the squib ignition drive circuit

B1478

Capacitor

• Voltage at the capacitor terminal is higher than the 

specified value for five seconds or more

B1479

• Voltage at the capacitor terminal is lower than the 

specified value for five seconds or more (This is not 
detected if diagnosis code No.41 or 42 indicating 
battery positive voltage drop has been set).

B1484

Driver's air bag module (2nd 
squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1485

• Open circuit in the squib ignition drive circuit

B1494

Front passenger's air bag module 
(2nd squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1495

• Open circuit in the squib ignition drive circuit

B1496

Non-volatile memory (EEPROM)

• When the non-volatile memory (EEPROM) are 

abnormal

B1497

ASIC (for frontal activation)

• When the ASIC (frontal activation) are abnormal

B1498

ROM or RAM

• When the ROM or RAM are abnormal

 

 

 

 

 

 

 

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