Infiniti G37 Coupe. Manual - part 1199

SRC-46

< COMPONENT DIAGNOSIS >

B1050, B1055 DRIVER AIRBAG MODULE

Is the inspection result normal?

YES

>> Check the intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

NO

>> Replace spiral cable.

B1051, B1056 DRIVER AIRBAG MODULE

SRC-47

< COMPONENT DIAGNOSIS >

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B1051, B1056 DRIVER AIRBAG MODULE

Description

INFOID:0000000001694524

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

For driver air bag module, crash is judged by main “G” sensor output signal and sub “G” sensor 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:0000000001694525

DTC DETECTION LOGIC 

With CONSULT-lll

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

DTC CONFIRMATION PROCEDURE (With CONSULT-lll)

1.

INSPECTION START

Turn ignition switch ON.

>> GO TO 2.

2.

CHECK SELF-DIAG RESULT

Check the screen of CONSULT-lll.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-48, "Diagnosis Procedure (Component diagnosis)"

.

NO

>> INSPECTION END.

DTC CONFIRMATION PROCEDURE (Without CONSULT-lll)

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

1.

INSPECTION START

Turn ignition switch ON.

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 diagnosis sen-

sor unit (ACU).

SRC-48

< COMPONENT DIAGNOSIS >

B1051, B1056 DRIVER AIRBAG MODULE

>> GO TO 2.

2.

CHECK AIR BAG WARNING LAMP

Check the warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-133, "DTC Index"

.

NO

>> INSPECTION END.

Diagnosis Procedure (Component diagnosis)

INFOID:0000000001694526

With CONSULT-lll

WARNING:

• Before servicing, turn ignition switch OFF, disconnect both battery terminals and wait at least 3 min-

utes. (To discharge backup capacitor.)

• 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

>> Repair or replace harness connector.

2.

CHECK WIRING HARNESS

Check the wiring harness externals.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace wiring harness.

3.

CHECK DRIVER AIR BAG MODULE

1.

Replace driver air bag module.

2.

Check the screen of CONSULT-III.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> GO TO 4.

4.

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.

Driver side air bag module 

harness connector

Terminal

Body side harness 

connector

Terminal

Continuity 

M302

10

11

M35

28
30

Existed

M301

9

12

30
29

Driver side air bag module harness con-

nector

Terminal

Ground

Continuity 

M302

10

11

Not existed

M301

9

12

B1051, B1056 DRIVER AIRBAG MODULE

SRC-49

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Is the inspection result normal?

YES

>> Check the intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

NO

>> Replace spiral cable.