service INFINITI QX56 2007 Factory Service Manual

SRS-2
< SERVICE INFORMATION >
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003532849
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:
• 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 performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SRS section.
• 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 har-
ness connectors.
Precaution for SRS "AIR BAG" and "SEAT BELT PRE-TENSIONER" Service
INFOID:0000000003532850
• 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 min-
utes.
For approximately 3 minutes after the cables are removed, it is still possible for the air bags and seat belt
pre-tensioners to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes
have passed.
• The air diagnosis sensor unit must always be installed with the arrow mark “⇐” pointing toward the front of
the vehicle for proper operation. Also check air bag 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 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.
• 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.
Occupant Classification System PrecautionINFOID:0000000003532851
Replace control unit and passenger front seat cushion as an assembly.

PREPARATION
SRS-3
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PREPARATION
Special Service ToolINFOID:0000000003532852
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
—
(J-42057)
Air bag lock master key setRemoving and installing air bag lock
LRS210

SRS-4
< SERVICE INFORMATION >
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS ConfigurationINFOID:0000000003532853
The air bag deploys if the air bag diagnosis sensor unit is activated while the ignition switch is in the ON or
START position.
The collision modes for which supplemental restraint systems are activated are different among the SRS sys-
tems. For example, the driver air bag module, front passenger air bag module, front seat belt pre-tensioners
and seat belt buckle pre-tensioner assemblies are activated in a frontal collision but not in a side collision.
SRS configurations for some collision modes are as follows:
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SRS configuration Frontal collision Left side collisionRight side colli-
sionRollover
Driver air bag module x — — —
Front passenger air bag module x — — —
Front LH seat belt pre-tensioner x — — x
Front LH seat belt buckle pre-tensioner assembly x — — x
Front RH seat belt pre-tensioner x — — x
Front RH seat belt buckle pre-tensioner assembly x — — x
Front LH side air bag module — x — —
Front RH side air bag module — — x —
LH side curtain air bag module — x — x
RH side curtain air bag module — — x x

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS-5
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Driver Air Bag ModuleINFOID:0000000003532854
The driver air bag module is dual stage and located in the steering
wheel assembly. It operates with the SRS system in a frontal colli-
sion exceeding a specified level.
Front Passenger Air Bag ModuleINFOID:0000000003532855
The front passenger air bag module is located behind the instrument
panel assembly. It operates with the SRS system in a frontal colli-
sion exceeding a specified level. Refer to SRS-6, "
Occupant Classi-
fication System (OCS)" for more information.
Front Side Air BagINFOID:0000000003532856
Front side air bag modules are built into the front seatback assem-
blies. Vehicles with side air bags are equipped with labels as shown.
Side Curtain Air BagINFOID:0000000003532857
Side curtain air bag modules are located above the vehicle headlining.
Vehicles with side curtain air bags are equipped with labels as
shown.
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SRS-6
< SERVICE INFORMATION >
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Front Seat Belt Pre-tensioner with Load Limiter
INFOID:0000000003532858
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.
Occupant Classification System (OCS)INFOID:0000000003532859
The occupant classification system (OCS) identifies different size occupants, out of position occupants, and
detects if child seat is present in the front passenger seat. The OCS receives inputs from the occupant classi-
fication sensor (located inside the passenger seat cushion assembly) and belt tension sensor (part of the pas-
senger front seat belt assembly and located at the belt anchor location). Depending on classification of the
passenger, the OCS sends a signal to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit
uses this signal and the seat belt buckle switch RH signal to determine deployment or non deployment of the
passenger front air bag in the event of a collision. Depending on the signals received, the air bag diagnosis
sensor unit can disable the passenger front air bag completely.
NOTE:
In case of customer concern, CONSULT-II can be used to confirm the passenger air bag status (readiness).
Passenger Air Bag Status Conditions
NOTE:
Passenger does not meet Occupant Classification System specifications for passenger air bag activation.
Direct-connect SRS Component ConnectorsINFOID:0000000003532860
The following SRS components use direct-connect style harness connectors.
• Driver air bag module
• Front passenger air bag module
• LH side front curtain air bag module
• LH side rear curtain air bag module
• RH side front curtain air bag module
• RH side rear curtain air bag module
• Front LH seat belt pre-tensioner
• Front RH seat belt pre-tensioner
• Seat belt buckle pre-tensioner assembly LH
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Front Passenger Seat
(Condition)PASS AIR BAG OFF Indicator
(Status)Passenger Air Bag Status
(Readiness)CONSULT-II Display
Seat occupied OFF Active (enabled) ON
Seat occupied
NOTEON Deactivated (disabled) OFF
Seat empty OFF Deactivated (disabled) OFF
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS-7
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• Seat belt buckle pre-tensioner assembly RH
Always pull up to release black locking tab prior to removing connector from SRS component.
Always push down to lock black locking tab after installing connector
to SRS component. When locked, the black locking tab is level with
the connector housing.
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SRS-8
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
Trouble Diagnosis IntroductionINFOID:0000000003532861
CAUTION:
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in
this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness con-
nectors.
• Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it
with a new one.
• Keep ground connections clean.
DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using “AIR BAG” warning lamp and/or CONSULT-II.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system mal-
function through the operation of the “AIR BAG” warning lamp.
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the “AIR BAG” warning lamp and CONSULT-II are as follows:
HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
Information From Customer
WHAT - Vehicle model
WHEN - Date, Frequencies
WHERE - Road conditions
HOW - Operating conditions, Symptoms
Preliminary Check
Check that the following parts are in good order.
• Battery (Refer to SC-4, "
How to Handle Battery" .)
• Fuse (Refer to SRS-12, "
Wiring Diagram - SRS -" .)
• System component-to-harness connections
WORK FLOW
User mode Diagnosis mode Display type
“AIR BAG” warning lamp X X ON-OFF operation
CONSULT-II — X Monitoring

TROUBLE DIAGNOSIS
SRS-9
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*1: "Preliminary Check" *2:SRS-20*3:SRS-21
*4:SRS-28
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SRS-10
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
SRS Component Parts Location
INFOID:0000000003532862
1. Side curtain air bag modules 2. Front RH side air bag module 3. Belt tension sensor
4. RH side air bag (satellite) sensor 5. Front RH seat belt pre-tension-
er6. Seat belt buckle pre-tensioner assembly
RH
7. Occupant classification system sen-
sor8. Occupant classification system
control unit9. Front passenger air bag off indicator
10. Front passenger air bag module 11. Crash zone sensor 12. Air bag warning lamp
13. Spiral cable 14. Driver air bag module 15. LH side air bag (satellite) sensor
16. Front LH seat belt pre-tensioner 17. Air bag diagnosis sensor unit 18. Front LH side air bag module
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TROUBLE DIAGNOSIS
SRS-11
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SchematicINFOID:0000000003532863
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