Infiniti EX35. Manual - part 1361

SRC-70

< COMPONENT DIAGNOSIS >

B1087 PRE-TEN FRONT LH

B1087 PRE-TEN FRONT LH

Description

INFOID:0000000003591817

DTC B1087 [VB-SHORT] PRE-TEN FRONT LH

For front LH seat belt pre-tensioner, crash is judged by main “G” sensor output signal and Safing algorithm in
front direction.

OPERATION

In the case of a frontal collision that exceeds specified impact level, the air bag diagnosis sensor unit detects
the deceleration caused by collision. It restrains the passenger with seat belt easing the stress on passengers
chest with load limiter.

STRUCTURE

The restraint system for front seat occupant consists of the pre-tensioner mechanism and load limiter mecha-
nism.

INSTALLATION

Front LH seat belt pre-tensioner is installed on the underside of center pillar with fixed nuts.

DTC Logic

INFOID:0000000003591818

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-70, "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:0000000003758575

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

B1087

PRE-TEN FRONT LH
[VB-SHORT]

Front LH seat belt pre-tensioner circuit 
is shorted to some power supply circuit

• Disconnection of wiring harness and 

short

• Internal breakdown in front LH seat 

belt pre-tensioner

• Internal breakdown in air bag diag-

nosis sensor unit

B1087 PRE-TEN FRONT LH

SRC-71

< 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 FRONT SEAT BELT PRE-TENSIONER

1.

Replace front LH seat belt pre-tensioner. Refer to 

SB-5, "SEAT BELT RETRACTOR : Exploded View"

.

2.

Check “Self diagnosis result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-70, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4. 

NO

>> INSPECTION END

4.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT 

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-16, "Exploded View"

.

2.

Check “Self diagnosis result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-70, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1. 

NO

>> INSPECTION END

SRC-72

< COMPONENT DIAGNOSIS >

B1088 PRE-TEN FRONT LH

B1088 PRE-TEN FRONT LH

Description

INFOID:0000000003591820

DTC B1088 [GND-SHORT] PRE-TEN FRONT LH

For front LH seat belt pre-tensioner, crash is judged by main “G” sensor output signal and Safing algorithm in
front direction.

OPERATION

In the case of a frontal collision that exceeds specified impact level, the air bag diagnosis sensor unit detects
the deceleration caused by collision. It restrains the passenger with seat belt easing the stress on passengers
chest with load limiter.

STRUCTURE

The restraint system for front seat occupant consists of the pre-tensioner mechanism and load limiter mecha-
nism.

INSTALLATION

Front LH seat belt pre-tensioner is installed on the underside of center pillar with fixed nuts.

DTC Logic

INFOID:0000000003591821

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-72, "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:0000000003758584

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

B1088

PRE-TEN FRONT LH 
[GND-SHORT]

Front LH seat belt pre-tensioner circuit 
is shorted to ground

• Disconnection of wiring harness and 

short

• Internal breakdown in front LH seat 

belt pre-tensioner

• Internal breakdown in air bag diag-

nosis sensor unit

B1088 PRE-TEN FRONT LH

SRC-73

< 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 FRONT SEAT BELT PRE-TENSIONER

1.

Replace front LH seat belt pre-tensioner. Refer to 

SB-5, "SEAT BELT RETRACTOR : Exploded View"

.

2.

Check “Self diagnosis result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-72, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4. 

NO

>> INSPECTION END

4.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT 

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-16, "Exploded View"

.

2.

Check “Self diagnosis result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-72, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1. 

NO

>> INSPECTION END