2011 INFINITI QX56 belt

LAP PRE-TENSIONERSR-29
< REMOVAL AND INSTALLATION >
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LAP PRE-TENSIONER
Exploded ViewINFOID:0000000006418803
Refer to SB-6, "SEAT BELT RETRACTOR : Exploded View".
Removal and InstallationINFOID:0000000006156561
For removal and installation procedures, refer to SB-8, "SEAT BELT BUCKLE : Removal and Installation".
Revision: 2010 May2011 QX56

SRC-1
RESTRAINTS
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SECTION SRC
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CONTENTS
SRS AIRBAG CONTROL SYSTEM
PRECAUTION ................ ...............................6
PRECAUTIONS .............................................. .....6
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
6
Service ......................................................................6
SYSTEM DESCRIPTION ..............................8
COMPONENT PARTS ................................... .....8
Component Parts Location .................................. ......8
Component Description .............................................9
SYSTEM .............................................................11
System Diagram .................................................. ....11
System Description .................................................12
DIAGNOSIS SYSTEM (AIR BAG) .....................14
Description .......................................................... ....14
On Board Diagnosis Function .................................14
CONSULT-III Function ............................................19
DIAGNOSIS SYSTEM (OCCUPANT DETEC-
TION SYSTEM) .............................................. ....
21
CONSULT-III Function ........................................ ....21
ECU DIAGNOSIS INFORMATION ..............22
DIAGNOSIS SENSOR UNIT .......................... ....22
DTC Index .......................................................... ....22
WIRING DIAGRAM ......................................27
SRS AIR BAG SYSTEM ................................. ....27
Wiring Diagram ................................................... ....27
BASIC INSPECTION ...................................36
DIAGNOSIS AND REPAIR WORK FLOW .... ....36
Work Flow ........................................................... ....36
INSPECTION AND ADJUSTMENT ....................39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ....
39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description .................................
39
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement ......
39
ZERO POINT RESET ............................................. ....39
ZERO POINT RESET : Description .........................39
ZERO POINT RESET : Special Repair Require-
ment .........................................................................
39
DTC/CIRCUIT DIAGNOSIS .........................41
B1001, B1002, B1003, B1004, B1005 DIAG-
NOSIS SENSOR UNIT ......................................
41
DTC Logic ............................................................ ....41
Diagnosis Procedure ...............................................41
B1006, B1007, B1008, B1009, B1010 DIAG-
NOSIS SENSOR UNIT ......................................
42
DTC Logic ................................................................42
Diagnosis Procedure ...............................................42
B1011, B1012, B1013, B1014, B1015 DIAG-
NOSIS SENSOR UNIT ......................................
43
DTC Logic ................................................................43
Diagnosis Procedure ...............................................43
B1017, B1020, B1021 OCCUPANT SENS C/U
...
44
Description ........................................................... ....44
DTC Logic ................................................................44
Diagnosis Procedure ...............................................44
B1018 OCCUPANT SENS ................................46
Description ........................................................... ....46
DTC Logic ................................................................46
Diagnosis Procedure ...............................................46
B1022 OCCUPANT SENS C/U .........................48
Description ...............................................................48
Revision: 2010 May2011 QX56

SRC-2
DTC Logic ...............................................................48
Diagnosis Procedure ..............................................48
B1023 PASS A/B INDCTR CKT ........................50
Description ........................................................... ...50
DTC Logic ...............................................................50
Diagnosis Procedure ..............................................50
B1025, B1032, B1048 OCS SENSOR ...............52
Description ........................................................... ...52
DTC Logic ...............................................................52
Diagnosis Procedure ..............................................52
B1026, B1027, B1028, B1029, B1030, B1031
DIAGNOSIS SENSOR UNIT ..............................
54
DTC Logic ............................................................ ...54
Diagnosis Procedure ..............................................54
B1033, B1034 CRASH ZONE SENSOR ...........55
DTC Logic ............................................................ ...55
Diagnosis Procedure ..............................................55
B1035 CRASH ZONE SENSOR ........................57
DTC Logic ............................................................ ...57
Diagnosis Procedure ..............................................57
B1036 CRASH ZONE SENSOR ........................59
DTC Logic ............................................................ ...59
Diagnosis Procedure ..............................................59
B1037, B1039, B1041 CRASH ZONE SEN-
SOR ....................................................................
60
DTC Logic ............................................................ ...60
Diagnosis Procedure ..............................................60
B1042, B1043, B1044, B1045, B1046, B1047
DIAGNOSIS SENSOR UNIT ..............................
62
DTC Logic ............................................................ ...62
Diagnosis Procedure ..............................................62
B1049, B1054 DRIVER AIR BAG MODULE .....63
DTC Logic ............................................................ ...63
Diagnosis Procedure ..............................................63
B1050, B1055 DRIVER AIR BAG MODULE .....65
DTC Logic ............................................................ ...65
Diagnosis Procedure ..............................................65
B1051, B1056 DRIVER AIR BAG MODULE .....67
DTC Logic ............................................................ ...67
Diagnosis Procedure ..............................................67
B1052, B1057 DRIVER AIR BAG MODULE .....69
DTC Logic ............................................................ ...69
Diagnosis Procedure ..............................................69
B1058, B1059, B1060, B1061, B1062, B1063
DIAGNOSIS SENSOR UNIT ..............................
71
DTC Logic ............................................................ ...71
Diagnosis Procedure ..............................................71
B1065, B1070 PASSENGER AIR BAG MOD-
ULE ....................................................................
72
DTC Logic ............................................................ ...72
Diagnosis Procedure ...............................................72
B1066, B1071 PASSENGER AIR BAG MOD-
ULE ....................................................................
74
DTC Logic ............................................................ ...74
Diagnosis Procedure ...............................................74
B1067, B1072 PASSENGER AIR BAG MOD-
ULE ....................................................................
76
DTC Logic ............................................................ ...76
Diagnosis Procedure ...............................................76
B1068, B1073 PASSENGER AIR BAG MOD-
ULE ....................................................................
78
DTC Logic ............................................................ ...78
Diagnosis Procedure ...............................................78
B1074, B1075, B1076, B1077, B1078, B1079
DIAGNOSIS SENSOR UNIT .............................
80
DTC Logic ............................................................ ...80
Diagnosis Procedure ...............................................80
B1080, B1096 DRIVER AIR BAG MODULE .....81
DTC Logic ............................................................ ...81
Diagnosis Procedure ...............................................81
B1081 SEAT BELT PRE-TENSIONER RH .......83
DTC Logic ............................................................ ...83
Diagnosis Procedure ...............................................83
B1082 SEAT BELT PRE-TENSIONER RH .......85
DTC Logic ............................................................ ...85
Diagnosis Procedure ...............................................85
B1083 SEAT BELT PRE-TENSIONER RH .......87
DTC Logic ............................................................ ...87
Diagnosis Procedure ...............................................87
B1084 SEAT BELT PRE-TENSIONER RH .......89
DTC Logic ............................................................ ...89
Diagnosis Procedure ...............................................89
B1086 SEAT BELT PRE-TENSIONER LH .......91
DTC Logic ............................................................ ...91
Diagnosis Procedure ...............................................91
B1087 SEAT BELT PRE-TENSIONER LH .......93
DTC Logic ............................................................ ...93
Diagnosis Procedure ...............................................93
B1088 SEAT BELT PRE-TENSIONER LH .......95
DTC Logic ............................................................ ...95
Diagnosis Procedure ...............................................95
B1089 SEAT BELT PRE-TENSIONER LH .......97
DTC Logic ............................................................ ...97
Diagnosis Procedure ...............................................97
Revision: 2010 May2011 QX56

SRC-6
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006219946
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
ServiceINFOID:0000000006219947
 Never use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
 Before servicing the SRS, turn ignition switch OF F, disconnect battery negative terminal and wait 3 minutes
or more.
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, never work on any SR S 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 chec k diagnosis sensor unit for cracks, deformities or rust before installa-
tion and replace as required.
 The spiral cable must be aligned with the neutral position since its rotations are limited. Never turn steering
wheel and 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.
 Always replace instrument panel pad following front passenger air bag deployment.
 Never solder the harness when making repairs. Check that harness is not pinched and that there is no con-
tact with other components.
 Never allow harness to come in contact with oil, grease, waste oil, or water.
 Never insert foreign materials, such as a screwdriver , into the harness connector. (This is to prevent acci-
dental activation caused by static electricity.)
 Always use CONSULT-III or SRS air bag warning lamp to perform the circuit diagnosis. (Never use an elec- tric tester such as a circuit tester.)
 Never enter in the deployment area of the pop-up roll bar. Never put an object in the deployment area of the
pop-up roll bar. (This is to prevent injury in case of an unintentional deployment.)
Revision: 2010 May2011 QX56

SRC-8
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006219948
1. Driver air bag module 2. Combination meter 3. Front passenger air bag off indicator
4. Passenger air bag module 5. Seat belt pre-tensioner 6. Front satellite sensor
7. Side air bag module 8. Rear satellite sensor 9. Rear curtain air bag module
10. Front curtain air bag module 11. Lap pre-tensioner 12. Air bag diagnosis sensor unit
JMHIA1650ZZ
Revision: 2010 May2011 QX56

COMPONENT PARTSSRC-9
< SYSTEM DESCRIPTION >
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Component DescriptionINFOID:0000000006219949
13. Occupant detection system control unit 14. Occupant detection system seat
sensor 15. Crash zone sensor
16. Combination switch (spiral cable)
A. Behind center pillar lower garnish B. View with seatback pad removed C. View with laggage side finisher lower removed
D. View with headlining assembly re- moved E. View with headlining assembly re-
moved F. View with center console assembly
removed
G. Backside of passenger seat cushion frame H. View with bumper fascia assembly
removed I. View with steering wheel removed
Component Function
Air bag diagnosis sensor unit  Detects a collision and supplies power supply for deployment to air bag module and
pre-tensioner seat belt.
 It contains the “G” sensors for both frontal and side collisions and spare battery function in case of main battery damage in collision.
Combination meter (air bag warning lamp) Indicates air bag malfunctioning and deployment by blinking and illuminating air bag
warning lamp.
Combination switch (spiral cable) Supplies power supply to driver air bag module on steering wheel.
Crash zone sensor  Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs.
 Crash zone sensor is a G sensor that outputs voltage signal during deceleration at
the time of a vehicle frontal collision that is more than the specified limit is detected.
Curtain air bag module (front/rear)  Deploys according to collision judgment of G sensor, and safing sensor.
 Receives collision signal from air bag diagnosis sensor unit, ignites, and burns ig-
nition material by electric ignition system, when side collision exceeds setting limit
of the vehicle. Gas is generated by chemical reaction of ignition material, passes
filter, and deploys air bag.
 Air bag module mainly consists of air bag and inflator that deploys air bag.
Driver air bag module  Receives signal from air bag diagnosis sensor unit and deploys air bag.
 In case of frontal collision where acceleration is more than the specified level, the
ignition materials are ignited by electric ignition system. The system burns the gas
generating materials resulting in a chemical reaction. This generates hot gases that
flow into the air bag through a filter and expand the bag.
Occupant detection system control unit Detects front passenger seat occupant.
Passenger air bag module  Receives signal from air bag diagnosis sensor unit and deploys air bag.
 In case of frontal collision where acceleration is more than the specified level, the
ignition materials are ignited by electric ignition system. The system burns the gas
generating materials resulting in a chemical reaction. This generates hot gases that
flow into the air bag through a filter and expand the bag.
Passenger air bag OFF indicator Indicates whether or not passenger air bag is in the activation mode based on the
judgement of occupant classification system.
Satellite sensor (front/rear)  Transmits signal to air bag diagnosis sensor unit when a side collision occurs.
 When air bag diagnosis sensor unit defines both signal voltage of the “G” sensor,
and the safing algorithm to be that of collision which is more than the specified lev-
el, the driving circuit switches on and feeds the electric ignitor of both the side air
bag and curtain air bag and seat belt pre-tensioner.
Seat belt buckle switch LH/RH Controls deployment timing depending on the seat belt condition that is fastened or
unfastened.
Seat belt pre-tensioner LH/RH  Receives signal from air bag diagnosis sensor unit and deploys seat belt pre-ten-
sioner.
 In the case of a frontal collision or side collision or roll over that exceeds specified impact level, the air bag diagnosis sensor unit detects the deceleration caused by
collision. It restrains the passenger with seat belt easing the stress on passengers
chest with load limiter.
Revision: 2010 May2011 QX56

SRC-10
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Side air bag module LH/RH Receives signal from air bag diagnosis sensor unit and deploys air bag.
 In case of side collision where acceleration is more than the specified level, the ig-
nition materials are ignited by electric ignition system. The system burns the gas
generating materials resulting in a chemical reaction. This generates hot gases that
flow into the air bag through a filter and expand the bag.
Lap pre-tensioner LH/RH  Receives signal from air bag diagnosis sensor unit and deploys lap pre-tensioner.
 In the case of a frontal collision or side collision or roll over that exceeds specified
impact level, the air bag diagnosis sensor unit detects the deceleration caused by
collision. It restrains the passenger with seat belt easing the stress on passengers
chest with load limiter.
 Lap pre-tensioner upgrades passenger restrain function by reducing movement of lumber during a frontal collision or side collision or roll over.
Component Function
Revision: 2010 May2011 QX56

SRC-12
< SYSTEM DESCRIPTION >
SYSTEM
System Description
INFOID:0000000006219951
Supplemental Restraint System (SRS ) activates air bag module and seat belt pre-tensioner when it detects a
frontal collision or a side collision or rollover that is more than the specified limit. Together with other safety
devices, it reduces the impact that occup ant receives when vehicle collision occurs.
Air bag diagnosis sensor unit supplies power supply to air bag module and pre-tensioner seat belt when decel-
eration that is more than the specified limit is detec ted by G sensor in air bag diagnosis sensor unit, crash
zone sensor, or satellite sensor. Air bag module is composed of electric igniter (squib), filter, pyrotechnic mate-
rial, and gas generating material. When air bag module re ceives a signal from air bag diagnosis sensor unit,
air bag module ignites pyrotechnic material using electric igniter (squib) so that gas generating material gener-
ates high temperature nitrogen gas. The gas through filter activates air bag. At the same time, pre-tensioner
seat belt receives power supply from air bag diagnosis sensor unit, gasgenerator is activated, and then gas is
generated. Balls in pipe are moved according to generated gas pressure and strike pinion gear on ELR shaft.
ELR shaft rotates and retracts seat belt.
AIR BAG DIAGNOSIS SENSOR UNIT FUNCTIONS
Air bag diagnosis sensor unit has the following functions.
 Detects a collision and supplies the energy for deploying air bag and seat belt pre-tensioner.
 Detects and records electrical malfunction in air bag system and seat belt pre-tensioner system, and blinking
air bag warning lamp.
 Detects and records the deployment of air bag and s eat belt pre-tensioner, and turns ON air bag warning
lamp.
 Indicates malfunctioning portion via the number of blin ks from the air bag warning lamp in the diagnosis
mode.
 Indicates the malfunction record via CONSULT-III.
COLLISION MODES
The operation of SRS is different depending on the collision modes applications.
SRS configurations that are activa ted for the following collision modes.
×: Apply —: Not apply
OCCUPANT DETECTION SYSTEM
This Occupant Detection System has the following functions.
1. Suppress the deployment of front passenger air bag w hen front passenger seat is empty, or when occu-
pied by child and child-seat. Turns ON front passenger air bag OFF indicator when front passenger seat is
occupied by child-seat and child.
2. Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.
3. Indicates the malfunctioning record by CONSULT-III.
4. When “zero point reset” for occupant detection system is incomplete, CONSULT-III indicates that “zero
point reset” is incomplete.
This function is applied to NISSAN genuine parts only.
NOTE:
SRS configuration Frontal collision Left side collision Right side collision Roll over
Driver air bag module ×———
Passenger air bag module ×———
Seat belt pre-tensioner LH ××—×
Seat belt pre-tensioner RH ×— ××
Lap pre-tensioner LH ××—×
Lap pre-tensioner RH ×— ××
Side air bag module LH — ×——
Side air bag module RH — — ××
Front curtain air bag module LH — ×— ×
Front curtain air bag module RH — — ××
Rear curtain air bag module LH — ×— ×
Rear curtain air bag module RH — — ××
Revision: 2010 May2011 QX56