Infiniti M35/M45 Y50. Manual — part 1097

PRECAUTIONS

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SRS

PRECAUTIONS

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Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”

NHS0008O

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

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To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

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Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

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Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

NHS0008P

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Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.

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Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 min-
utes.
For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt
pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes
have passed.

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Diagnosis sensor unit must always be installed with their arrow marks “

⇐

” pointing towards the front of the

vehicle for proper operation. Also check diagnosis sensor unit for cracks, deformities or rust before instal-
lation and replace as required.

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The spiral cable must be aligned with the neutral position since its rotations are limited. Do not turn steer-
ing wheel and column after removal of steering gear.

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Handle air bag module carefully. Always place driver and front passenger air bag modules with the pad
side facing upward and seat mounted front side air bag module standing with the stud bolt side facing
down.

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Conduct self-diagnosis to check entire SRS for proper function after replacing any components.

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After air bag inflates, the front instrument panel assembly should be replaced if damaged.

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Always replace instrument panel pad following front passenger air bag deployment.

Occupant Classification System Precaution

NHS0008Q

Replace occupant classification system control unit and passenger front seat cushion as an assembly.
Refer to

SE-166, "Passenger's Seat Components"

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SRS-4

PREPARATION

PREPARATION

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Commercial Service Tools

NHS0008R

Tool name

Description

Tamper resistant TORX bit

—

S-NT757

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

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SRS Configuration

NHS0008S

The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the ON or START posi-
tion.
The collision modes for which supplemental restraint systems are activated are different among the SRS sys-
tems. For example, the driver air bag module and front passenger air bag module are activated in a frontal col-
lision but not in a side collision.
SRS configurations which are activated for some collision modes are as follows;

PHIA1120E

SRS configuration

Frontal collision

Left side collision

Right side collision

Driver air bag module

×

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—

Front passenger air bag module

×

—

—

Front LH seat belt pre-tensioner

×

—

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Front RH seat belt pre-tensioner

×

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Front LH side air bag module

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×

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Front RH side air bag module

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×

LH side curtain air bag module

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×

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RH side curtain air bag module

—

—

×

SRS-6

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

Front Seat Belt Pre-Tensioner with Load Limiter

NHS0008T

The seat belt pre-tensioner system with load limiter is installed for
both the driver's seat and the front passenger's seat. It operates
simultaneously with the SRS air bag system in the event of a frontal
collision with an impact exceeding a specified level.
When the frontal collision with an impact exceeding a specified level
occurs, seat belt slack resulting from clothing or other factors is
immediately taken up by the pre-tensioner. Vehicle passengers are
securely restrained.
When passengers in a vehicle are thrown forward in a collision and
the restraining force of the seat belt exceeds a specified level, the
load limiter permits the specified extension of the seat belt by the
twisting of the ELR shaft, and a relaxation of the chest-area seat belt
web tension while maintaining force.

Front Side Air Bag

NHS0008U

Front side air bag is built-in type.
The front seatback with built-in type side air bag have the labels as
shown.

Side Curtain Air Bag

NHS0008V

The side curtain air bags have the labels as shown.

SRS444

SHIA0170E

BF-2006D