Infiniti M35/M45 Y50. Manual - part 1109

FRONT SEAT BELT PRE-TENSIONER

SRS-51

C

D

E

F

G

I

J

K

L

M

A

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SRS

FRONT SEAT BELT PRE-TENSIONER

PFP:86884

Removal and Installation

NHS0009I

For removal and installation procedures, refer to 

SB-29, "Removal and Installation of Front Seat Belt"

 .

SRS-52

DIAGNOSIS SENSOR UNIT

DIAGNOSIS SENSOR UNIT

PFP:28556

Removal and Installation

NHS0009J

REMOVAL

CAUTION:

●

Before servicing, turn ignition switch OFF, disconnect both battery terminal and wait at least 3
minutes.

●

Before disconnecting the air bag sensor unit harness connector, be sure to disconnect the each
harness connector of the air bag module and pre-tensioner seatbelt to prevent air bag deployment
by static electricity and pre-tensioner seatbelt operation.

●

Do not use air tools or electric tools for servicing.

●

Do not use old fixing bolts after removal; replace with new bolts.

●

Do not make an impact to the diagnosis sensor unit by dropping etc. Replace the diagnosis sen-
sor unit if it has been dropped or sustained an impact.

●

Replace the diagnosis sensor unit of deployed SRS air bag and deployed SRS front seat belt pre-
tensioner. 

1.

Remove the diagnosis sensor unit.

●

Disconnect each connector of all air bag modules and pre-tensioner seat belts.

●

Remove the center console assembly. Refer to 

IP-10, "INSTRUMENT PANEL ASSEMBLY"

 .

●

Disconnect diagnosis sensor unit harness connector.

●

Remove hex bolts and ground bolt, then remove the diagno-
sis sensor unit. 

INSTALLATION

Install in the reverse order of removal.

CAUTION:

●

Be careful not to damage the diagnosis sensor harness.

●

After the work is completed, make sure no system malfunction is detected by air bag warning
lamp.

●

In case that malfunction is detected by the air bag warning lamp, reset by the self-diagnosis func-
tion and delete the memory by CONSULT

−

ll. 

●

In case that malfunction is still detected after the above operation, perform self-diagnosis to repair
malfunctions. Refer to 

SRS-20, "SRS Operation Check"

 .

ECU DISCRIMINATED NO.

After replacing the diagnosis sensor unit, confirm that the diagnosis sensor unit identification is correct for the
vehicle as equipped.

Hex bolts 

: 

24.5 N·m (2.5 kg

−

m, 18 ft

−

lb)

Ground bolt A

: 

6.9 N·m (0.7kg

−

m, 61 in

−

lb)

PHIA0869J

Specification

ECU DISCRIMINATED No.

2WD
AWD

Models with driver and passenger air bags, seat belt pre-tensioner, side air bags and curtain air 
bags

FAD4H

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

SRS-53

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A

B

SRS

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

PFP:98852

Removal and Installation

NHS0009K

The occupant classification system control unit, seat pressure sensor, and bladder are an integral part of the
front passenger seat cushion and are replaced as an assembly. Refer to 

SE-166, "Passenger's Seat Compo-

nents"

 .

SRS-54

COLLISION DIAGNOSIS

COLLISION DIAGNOSIS

PFP:00015

For Frontal Collision

NHS0009L

To repair the SRS, perform the following steps.
When SRS (except the front side air bag and side curtain air bag modules) is activated in a collision:
1.

Replace the diagnosis sensor unit.

2.

Remove the air bag modules (except the front side air bag modules and side curtain air bag modules),
crash zone sensor assembly, bracket and seat belt pre-tensioner assemblies.

3.

Check the SRS components using the table below:

–

Replace any SRS components showing visible signs of damage (dents, cracks and deformation).

4.

Install new air bag modules (except the front side air bag modules and side curtain air bag modules) crash
zone sensor assembly, bracket and seat belt pre-tensioner assemblies.

5.

Conduct self-diagnosis using CONSULT-II or “AIR BAG” warning lamp. Refer to 

SRS-20, "SRS Operation

Check"

  for details. Ensure entire SRS operates properly.

When SRS is not activated in a collision:

1.

Check the SRS components using the table below:

–

Replace any SRS components showing visible signs of damage (dents, cracks and deformation).

2.

Conduct self-diagnosis using CONSULT-II or “AIR BAG” warning lamp. Refer to 

SRS-20, "SRS Operation

Check"

  for details. Ensure entire SRS operates properly.

When only one front air bag module is activated in a collision:

1.

Replace the following components:

–

Diagnosis sensor unit

–

Crash zone sensor

–

Activated front air bag and seat belt pre-tensioner.

2.

Check the other SRS components using the table below (Refer to “SRS is NOT activated”).

–

Replace any SRS components showing visible signs of damage (dents, cracks and deformation).

3.

Conduct self-diagnosis using CONSULT-II or “AIR BAG” warning lamp. Refer to 

SRS-20, "SRS Operation

Check"

  for details. Ensure entire SRS operates properly.

Only one front air bag may inflate a crash, depending on the crash severity and whether the front occupants
are belted or unbelted. This does not indicate improper performance of the system. Perform self-diagnosis to
make sure the entire SRS operates properly.

SRS INSPECTION (FOR FRONTAL COLLISION)

Part

SRS is activated

SRS is NOT activated

Driver airbag 
module

If the Driver airbag has deployed:
REPLACE.
Install with new fasteners.

If the Driver air bag has NOT been activated:
[same text as in current manual]

Passenger front 
airbag module

If the Passenger front airbag has deployed: 
REPLACE.
Install with new fasteners.

If the Passenger front air bag has NOT been activated:
[same text as in current manual]

Crash zone 
sensor

If any of the front airbags or seat belt pre-
tensionsers have been activated:
REPLACE the crash zone sensor and bracket 
with new fasteners. 

If the front airbags or seat belt pre-tensionsers have NOT
been activated:
[same text as in current manual]

Seat belt pre-ten-
sioner assemblies

If the driver or passenger Seat belt pre-ten-
sioner has been activated:
REPLACE the seat belt pre-tensioner
assemblies with new  fasteners. 

If the pre-tensioners have NOT been activated:
[same text as in current manual]

Diagnosis sensor 
unit

If any of the SRS components have been
activated:
REPLACE the Diagnosis sensor unit.
Install with new fasteners.

If none of the SRS components have been activated:
[same text as in current manual]