INFINITI QX56 2008 Factory Service Manual

DIAGNOSIS AND REPAIR WORK FLOWSRC-3
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work FlowINFOID:0000000001735282
OVERALL SEQUENCE
DETAILED WORK FLOW
1.CUSTOMER INFORMATION
Get detailed information from the customer about the symptom.
>> GO TO 2
2.PRELIMINARY CHECK
Perform preliminary check. Refer to SRC-13, "
Trouble Diagnosis Introduction".
*1 SRC-13, "Trouble Diagnosis Intro-
duction"
*2SRC-13, "SRS Operation Check"*3 SRC-5, "Trouble Diagnosis with
CONSULT-III"
*4SRC-15, "Self-Diagnosis Function
(Without CONSULT-III)"
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Revision: March 2010 2008 QX56

SRC-4
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORK FLOW
>> GO TO 3
3.TECHNICAL SERVICE BULLETINS
Check for technical service bulletins.
>> GO TO 4
4.USER MODE
Perform self-diagnosis using the "AIR BAG" warning lamp in User mode. Refer to SRC-13, "
SRS Operation
Check".
>> GO TO 5
5.SELF-DIAGNOSIS
Perform SELF-DIAGNOSIS. Refer to SRC-5, "
Trouble Diagnosis with CONSULT-III" (w/CONSULT-III) or
SRC-15, "
Self-Diagnosis Function (Without CONSULT-III)" (w/o CONSULT- III).
>> GO TO 6
6.REPLACE PART
Replace the malfunctioning part.
>> GO TO 7
7.FINAL CHECK
Check SRS using Diagnosis mode and User mode.
Does Diagnosis mode and User mode indicate SRS normal?
YES >> Inspection end.
NO >> GO TO 5
Revision: March 2010 2008 QX56

INTERMITTENTS INCIDENTSRC-5
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INTERMITTENTS INCIDENT
Inspection ProcedureINFOID:0000000001735283
INTERMITTENT TROUBLE
An intermittent incident may have occured in the past but is not being detected currently. This DTC will not be
detected on SELF DIAG [CURRENT], but may be view ed on SELF DIAG [PAST] using CONSULT-III.
Trouble Diagnosis with CONSULT-IIIINFOID:0000000001735284
DIAGNOSTIC PROCEDURE 4
Check SRS Repair History
1.CONSIDER POSSIBILITY THAT SELF-DIAGNOSTIC RESULT WAS NOT ERASED AFTER REPAIR
Check repair history of the SRS.
Have any previous repairs been made to the SRS?
Yes >> Self-diagnostic result “SELF-DIAG [PAST]” (previously stored in the memory) might not be erased after repair. Go to "DIAGNOSTIC PROCEDURE 3". Refer to SRC-15, "
Self-Diagnosis Function
(Without CONSULT-III)".
No >> Go to "DIAGNOSTIC PROCEDURE 2". Refer to SRC-13, "
SRS Operation Check".
Revision: March 2010 2008 QX56

SRC-6
< FUNCTION DIAGNOSIS >
SRS AIR BAG SYSTEM
FUNCTION DIAGNOSIS
SRS AIR BAG SYSTEM
SRS ConfigurationINFOID:0000000001735369
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 collision Right side colli-
sion Rollover
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 —— xx
Revision: March 2010 2008 QX56

SRS AIR BAG SYSTEMSRC-7
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SRS Component Parts LocationINFOID:0000000001735370
Driver Air Bag ModuleINFOID:0000000001735287
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.
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- sor 8. Occupant classification system
control unit 9. 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 module15. 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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Revision: March 2010 2008 QX56

SRC-8
< FUNCTION DIAGNOSIS >
SRS AIR BAG SYSTEM
Front Passenger Air Bag Module
INFOID:0000000001735288
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 SRC-10, "
Occupant Clas-
sification System (OCS)" for more information.
Front Side Air BagINFOID:0000000001735289
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:0000000001735290
Side curtain air bag modules are located above the vehicle headlining.
Vehicles with side curtain air bags are equipped with labels as
shown.
Front Seat Belt Pre-te nsioner with Load LimiterINFOID:0000000001735291
The seat belt pre-tensioner system wi th 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 im pact 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.
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Revision: March 2010 2008 QX56

SRS AIR BAG SYSTEMSRC-9
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Direct-connect SRS Co mponent ConnectorsINFOID:0000000001735292
The following SRS components use dire ct-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
• Seat belt buckle pre-tensioner assembly RH
Always pull up to release 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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Revision: March 2010 2008 QX56

SRC-10
< FUNCTION DIAGNOSIS >
OCCUPANT CLASSIFICATION SYSTEM
OCCUPANT CLASSIFICATION SYSTEM
System DiagramINFOID:0000000001735293
Occupant Classification System (OCS)INFOID:0000000001735294
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 diagnos is 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-III can be used to confirm the passenger air bag status (readiness).
Passenger Air Bag Status Conditions
NOTE:
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Front Passenger Seat
(Condition) PASS AIR BAG OFF Indicator
(Status) Passenger Air Bag Status
(Readiness) CONSULT-III Display
Seat occupied OFF Active (enabled)ON
Seat occupied
NOTEON Deactivated (disabled) OFF
Seat empty OFF Deactivated (disabled) OFF
Revision: March 2010 2008 QX56

OCCUPANT CLASSIFICATION SYSTEMSRC-11
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Passenger does not meet Occupant Classification System specifications for passenger air bag activation.
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Revision: March 2010 2008 QX56

SRC-12
< FUNCTION DIAGNOSIS >
PASSENGER SEAT BELT WARNING SYSTEM
PASSENGER SEAT BELT WARNING SYSTEM
System DiagramINFOID:0000000001735295
System DescriptionINFOID:0000000001735296
The passenger seat belt warning system will remind the driver if the
driver or front passenger seat belt should be buckled by turning on
the seat belt warning light (1). The system works in conjunction with
the occupant classification system. Refer to SRC-10, "
Occupant
Classification System (OCS)".
Passenger Seat Belt Warning System Operation
Component Parts LocationINFOID:0000000001735297
Refer to SRC-7, "SRS Component Parts Location".
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Driver seat status
(Ignition switch ON) Passenger seat status Seat belt buckle switch
LH status Seat belt buckle switch
RH statusSeat belt warning lamp
Seat occupied Seat occupied
Buckled Buckled
Off
Unbuckled On
Seat unoccupied —Off
— Unbuckled On
Revision: March 2010 2008 QX56