Infiniti Q45 (FY33). Manual - part 524

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

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

Before servicing the SRS, turn ignition switch “OFF”, disconnect both battery cables and wait at least 3
minutes.
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.

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
installation and replace as required.

The spiral cable must be aligned with the neutral position since its rotations are limited. Do not attempt to
turn steering wheel or column after removal of steering gear.

Handle air bag module carefully. Always place driver and passenger air bag modules with the pad side
facing upward and side air bag module (built-in type) with the stud bolt side facing down.

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

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

Special Service Tools

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)
Tool name

Description

KV991072S0
(J38381-KIT)
Air bag deployment kit

NT357

Disposing of air bag module

KV99106400
(J38381)
Deployment tool

KV991065S0
(J38381-30)
Deployment tool
adapters

NT353

*Deployment tool adapters for seat belt
pre-tensioner and for passenger air bag
module with black connector are not neces-
sary for servicing INFINITI Q45.

KV99105300
(J41246)
Air bag module bracket

NT354

Anchoring air bag module

HT61961000 and
HT62152000 combined
(J38219)
*Special torx bit

NT361

Use for special bolts
[TAMPER RESISTANT TORX (Size T50)]

a: 3.5 (0.138) dia.
b: 8.5 - 8.6 (0.335 - 0.339) dia.
c: approx. 10 (0.39) sq.
Unit: mm (in)

KV99108200
(J38381-50)
Deployment tool adapters for
seat belt pre-tensioner

NT721

*: Special tool or commercial equivalent

IDX

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

RS-11

Description

The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in “ON” or “START” posi-
tion.

SRS585-C

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 passenger air bag module are activated in a frontal colli-
sion but not in a side collision.
SRS configurations which are activated for some collision modes are as follows;

SRS configuration

Frontal collision

Left side collision

Right side collision

Driver air bag module

—

Passenger air bag module

—

Seat belt pre-tensioner (LH)

—

Seat belt pre-tensioner (RH)

—

Side air bag module (LH)

—

Side air bag module (RH)

—

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

RS-12

SRS501

Seat Belt Pre-tensioner with Load Limiter

The seat belt pre-tensioner system with load limiter is installed to
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 fron-
tal 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
stopper-A pin will break, allowing the ring gear to rotate. At this
point, resistance force from the belt housing is applied to the wire
attached to the ring gear so that the wire keeps a constant level of
tension (resistance against further rotation of the ring gear in the
normal direction). As the ring gear stopper-A rotates and reaches
the stopper-B position, it will cease rotation, causing the seat belt
webbing to stop extending. By the mechanism, the load limiter
permits the specified extension of the seat belt, and a relaxation of
the chest-area seat belt web tension while maintaining force.

SRS808

Built-in Type Side Air Bag

Side air bag is built-in type.
The front seat back with built-in type side air bag has the label
shown in the figure at left.

IDX

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

RS-13

SRS Component Parts Location

SRS768

SRS222

Maintenance Items

CAUTION:

Do not use a circuit tester to check SRS circuit.
1.

Check operation of “AIR BAG” and “SEAT BELT” warning
lamps.
After turning ignition key to “ON” position, both warning lamps
illuminate. The “AIR BAG” warning lamp will go off after about
7 seconds if no malfunction is detected. The “SEAT BELT”
warning lamp will also go off after about 7 seconds after seat
belt has been fastened and no malfunction is detected. (When
seat belt has not been fastened, the warning lamp continues
to illuminate until seat belt is fastened.)
If any of the following warning lamp conditions occur, immedi-
ately check the air bag or seat belt pre-tensioner system. Refer
to RS-38 or RS-39 for details.

The “AIR BAG” or “SEAT BELT” warning lamp does not illumi-
nate when the ignition switch is turned “ON”.

The “AIR BAG” or “SEAT BELT” (with seat belt fastened) warn-
ing lamp does not go off about 7 seconds after the ignition
switch is turned “ON”.

The “AIR BAG” or “SEAT BELT” (with seat belt fastened) warn-
ing lamp blinks after about 7 seconds after the ignition switch
is turned “ON”.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

RS-14

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