Infiniti EX35. Manual - part 1354

SRC-42

< COMPONENT DIAGNOSIS >

B1050, B1055 DRIVER AIRBAG MODULE

B1050, B1055 DRIVER AIRBAG MODULE

Description

INFOID:0000000003591770

DTC B1050, B1055 [VB-SHORT] DRIVER AIRBAG MODULE

For driver air bag module, crash is judged by main “G” sensor output signal and Safing algorithm in front direc-
tion.

OPERATION

In case of frontal collision whose acceleration exceeds the specified level, the ignition materials are ignited by
electric ignition system. The system burns and introduces the chemical reaction of gas generating materials to
generate hot gases that flow into the air bag through a filter and expand the bag.

STRUCTURE

Driver air bag module mainly consists of air bag and inflator which inflates air bag.

INSTALLATION

Driver air bag module is installed on the center of steering wheel with fixed bolts.

DTC Logic

INFOID:0000000003591771

DTC DETECTION LOGIC 

With CONSULT-III

DTC No. Index (“SELF-DIAG [CURRENT]”), (“SELF-DIAG [PAST]” or “TROUBLE DIAG RECORD”)

DTC CONFIRMATION PROCEDURE (WITH CONSULT-III)

1.

CHECK SELF-DIAG RESULT

1.

Turn ignition switch ON.

2.

Check the screen of CONSULT-III.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-42, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC CONFIRMATION PROCEDURE (WITHOUT CONSULT-III)

NOTE:
• SRS will not enter diagnosis mode if no malfunction is detected in user mode.

1.

CHECK AIR BAG WARNING LAMP

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to warning lamp flash code chart. Refer to 

SRC-128, "DTC Index"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003591772

WITH CONSULT-III

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3

minutes. (To discharge backup capacitor.)

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1050
B1055

DRIVER AIRBAG MOD-
ULE 
[VB-SHORT]

Driver air bag module circuit is shorted 
to some power supply circuit
(including the spiral cable)

• Disconnection of wiring harness and 

short

• Internal breakdown in driver air bag 

module

• Internal breakdown in spiral cable
• Internal breakdown in air bag diag-

nosis sensor unit

B1050, B1055 DRIVER AIRBAG MODULE

SRC-43

< COMPONENT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

• Do not use unspecified tester or other measuring device. 

DIAGNOSTIC PROCEDURE

1.

CHECK HARNESS CONNECTOR

Check the connection of harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace harness connector.

2.

CHECK WIRING HARNESS

Check the wiring harness externals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace wiring harness.

3.

CHECK SPIRAL CABLE CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect driver side air bag module harness connector and body side harness connector.

3.

Check continuity between driver side air bag module harness connector and body side harness connec-
tor.

4.

Check continuity between driver side air bag module harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace spiral cable. Refer to 

SR-6, "Removal and Installation"

.

4.

CHECK DRIVER AIR BAG MODULE

1.

Replace driver air bag module. Refer to 

SR-4, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-42, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace driver air bag diagnosis sensor unit. Refer to 

SR-16, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-42, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END

Driver side air bag module 

harness connector

Terminal

Body side harness 

connector

Terminal

Continuity 

M302

10

M35

28

Existed

11

30

M301

12

29

9

30

Driver side air bag module harness con-

nector

Terminal

Ground

Continuity 

M302

10

Not existed

11

M301

12

9

SRC-44

< COMPONENT DIAGNOSIS >

B1051, B1056 DRIVER AIRBAG MODULE

B1051, B1056 DRIVER AIRBAG MODULE

Description

INFOID:0000000003591773

DTC B1051, B1056 [GND-SHORT] DRIVER AIRBAG MODULE

For driver air bag module, crash is judged by main “G” sensor output signal and Safing algorithm in front direc-
tion.

OPERATION

In case of frontal collision whose acceleration exceeds the specified level, the ignition materials are ignited by
electric ignition system. The system burns and introduces the chemical reaction of gas generating materials to
generate hot gases that flow into the air bag through a filter and expand the bag.

STRUCTURE

Driver air bag module mainly consists of air bag and inflator which inflates air bag.

INSTALLATION

Driver air bag module is installed on the center of steering wheel with fixed bolts.

DTC Logic

INFOID:0000000003591774

DTC DETECTION LOGIC 

With CONSULT-III

DTC No. Index (“SELF-DIAG [CURRENT]”), (“SELF-DIAG [PAST]” or “TROUBLE DIAG RECORD”)

DTC CONFIRMATION PROCEDURE (WITH CONSULT-III)

1.

CHECK SELF-DIAG RESULT

1.

Turn ignition switch ON.

2.

Check the screen of CONSULT-III.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-44, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC CONFIRMATION PROCEDURE (WITHOUT CONSULT-III)

NOTE:
• SRS will not enter diagnosis mode if no malfunction is detected in user mode.

1.

CHECK AIR BAG WARNING LAMP

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to warning lamp flash code chart. Refer to 

SRC-128, "DTC Index"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003591775

WITH CONSULT-III

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3

minutes. (To discharge backup capacitor.)

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1051
B1056

DRIVER AIRBAG MOD-
ULE 
[GND-SHORT]

Driver air bag module circuit is shorted 
to ground
(including the spiral cable)

• Disconnection of wiring harness and 

short

• Internal breakdown in driver air bag 

module

• Internal breakdown in spiral cable
• Internal breakdown in air bag diag-

nosis sensor unit

B1051, B1056 DRIVER AIRBAG MODULE

SRC-45

< COMPONENT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

• Do not use unspecified tester or other measuring device. 

DIAGNOSTIC PROCEDURE

1.

CHECK HARNESS CONNECTOR

Check the connection of harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace harness connector.

2.

CHECK WIRING HARNESS

Check the wiring harness externals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace wiring harness.

3.

CHECK SPIRAL CABLE CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect driver side air bag module harness connector and body side harness connector.

3.

Check continuity between driver side air bag module harness connector and body side harness connec-
tor.

4.

Check continuity between driver side air bag module harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace spiral cable. Refer to 

SR-6, "Removal and Installation"

.

4.

CHECK DRIVER AIR BAG MODULE

1.

Replace driver air bag module. Refer to 

SR-4, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-44, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace driver air bag diagnosis sensor unit. Refer to 

SR-16, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-44, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END

Driver side air bag module 

harness connector

Terminal

Body side harness 

connector

Terminal

Continuity 

M302

10

M35

28

Existed

11

30

M301

12

29

9

30

Driver side air bag module harness con-

nector

Terminal

Ground

Continuity 

M302

10

Not existed

11

M301

12

9