warning INFINITI QX56 2011 Factory Service Manual

SR-26
< REMOVAL AND INSTALLATION >
DIAGNOSIS SENSOR UNIT
DIAGNOSIS SENSOR UNIT
Exploded ViewINFOID:0000000006113065
Removal and InstallationINFOID:0000000006113066
WARNING:
 Before servicing, turn ignition switch OFF, disconnect battery ne gative terminal and wait 3 minutes
or more.
 Before disconnecting the air bag diagnosis sensor unit harness conn ectors, be sure to disconnect
the each harness connector of the air bag module and seat belt pre-tensioner to prevent air bag
deployment by static electricity and seat belt pre-tensioner operation.
 Never use the air tools or electric tools for servicing.
 When replacing the air bag diagno sis sensor unit, always check with th e parts department for the lat-
est parts information. Installing an incorrect air bag diagnosis sen sor unit may or may not cause the
air bag warning lamp to illuminate and may cause in correct deployment of the supplemental air bags
and seat belt pre-tensioners in a collision r esulting in serious personal injury or death.
REMOVAL
1. Always check the air bag diagnosis sensor unit E CU discriminated number (identification number) using
CONSULT-III.
2. Disconnect the each connector of all air bag modules and pre-tensioner seat belts.
3. Remove the console finisher assembly. Refer to IP-25, "
Removal and Installation".
4. Remove the diagnosis sensor unit fixing bolts, ground bolt, and then remove diagnosis sensor unit.
5. Disconnect the diagnosis sensor unit harness connector.
1. Diagnosis sensor unit
Refer to GI-4, "
Components" for symbols in the figure.
JMHIA1478GB
Revision: 2010 May2011 QX56

DIAGNOSIS SENSOR UNITSR-27
< REMOVAL AND INSTALLATION >
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CAUTION:
 Never impact the diagnosis sensor unit.
 Replace the diagnosis sensor uni t if it has been dropped or
sustained an impact.
 Replace the diagnosis sensor unit of deployed SRS air bag and deployed front seat belt pre-ten-
sioner.
INSTALLATION
Install in the revers order of removal.
CAUTION:
 Never use the old fixing bolts afte r removal, replace with the new bolts.
 Never damage the harness co nnector while installing.
 If malfunction is detected by the air bag warnin g lamp, after repair or replacement of the malfunc-
tioning parts, reset the memory using sel f-diagnosis or CONSULT-III. Refer to SRC-14, "
On Board
Diagnosis Function" or SRC-19, "CONSULT-III Function".
 After the work is completed, check that no system malfunction is detected by air bag warning lamp.
 After replacing the air bag diag nosis sensor unit, confirm using CO NSULT-III that the ECU discrimi-
nated number (identification nu mber) of the new replacement air bag sensor unit matches the ECU
discriminated number (identification number) of the replaced (old) air bag diagnosis sensor unit.
NOTE:
If the ECU discriminated number of the new replacement air bag diagnosis sensor unit differs from the ECU
discriminated number of the replaced air bag diagnosis sens or unit, reconfirm the parts information and verify
that the correct air bag diagnosis sensor unit was installed.
JMHIA0009ZZ
Revision: 2010 May2011 QX56

SRC-5
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B1313, B1315, B1316, B1317 SATELLITE
SEN LH ........................................................... ..
190
DTC Logic ........................................................... ..190
Diagnosis Procedure .............................................190
B1314 SATELLITE SEN LH .............................192
DTC Logic ........................................................... ..192
Diagnosis Procedure .............................................192
SYMPTOM DIAGNOSIS ............................193
SRS AIR BAG WARNING LAMP DOES NOT
TURN OFF ........ ...............................................
193
Diagnosis Procedure ........................................... ..193
SRS AIR BAG WARNING LAMP DOES NOT
TURN ON ........................................................
194
Diagnosis Procedure ........................................... ..194
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

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-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

SYSTEMSRC-13
< SYSTEM DESCRIPTION >
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 Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from Occupant Detection System.
 Even if zero point reset is “complete”, always perfo rm zero point reset after the removal and installation of
seat or the removal of control unit harness connector.
Status (front passenger
seat) Passenger air bag Front passenger air
bag OFF indicatorAir bag warning lamp
Seat belt warning lamp
(when front passenger
seat is unbuckled)
Empty Suppress OFF OFF OFF
An object Suppress ON OFF OFF
Child/ child-seat Suppress ON OFF ON
Adult Enable to deploy OFF OFF ON
Malfunction Suppress ON Blinking OFF
Zero point reset
Not yet performed (NIS-
SAN genuine parts
only) Suppress ON Blinking OFF
Revision: 2010 May2011 QX56

SRC-14
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AIR BAG)
DIAGNOSIS SYSTEM (AIR BAG)
DescriptionINFOID:0000000006219952
CAUTION:
 Never use electrical test equipment on any circuit related to the SRS unless instructed in this Ser-
vice Manual. SRS wiring harnesses can be identifi ed by yellow and/or orange harnesses or harness
connectors.
 Never repair, splice or modify the SRS wiring harn ess. If the harness is damaged, replace it with a
new one.
 Keep ground portion clean.
DIAGNOSIS FUNCTION
 The SRS self-diagnostic results can be read with air bag warning lamp and/or CONSULT-III.
 The user mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction 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-III are as per the following items.
× : Application, —: Not application
On Board Diagn osis FunctionINFOID:0000000006219953
ON-BOARD DIAGNOSIS
There are two self diagnosis functions with air bag warning lamp per the following items.
USER MODE
 DIAGNOSIS MODE
METHOD OF STARTING
 Diagnosis mode changes from user mode to di agnosis mode when changing operation is performed.
 In user mode, when SRS air bag warning lamp is not blinking, changing to diagnosis mode by ignition switch
operation is not possible.
 In diagnosis mode, when repair is complete and system is normal, the mode changes to user mode when
ignition switch is turned from OFF to ON.
Procedure to Change Diagnosis Mode
1. Turn ignition switch from OFF to ON.
2. SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 1second after the lamp turns OFF.
3. After turning ignition switch OFF, wait for 3 seconds or more.
4. Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3times in total.
5. Turn ignition switch from OFF to ON. Diagnosis mode changes.
USER MODE
In USER MODE, air bag warning lamp on combination meter blinks when a malfunction is detected and warns
the customer (driver).
How to Read Air Bag Warning Lamp
1. Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.
2. Compare the air bag warning lamp blinking pattern with the examples.
Air Bag Warning Lamp Examples
Diagnosis tool User mode Diagnosis mode
Air bag warning lamp ××
CONSULT-III – ×
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (AIR BAG)SRC-15
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DIAGNOSIS MODE
The diagnosis mode can only be switched when a malfuncti on is detected in the user mode. Malfunctioning
system is indicated according to blinking pattern of air bag warning lamp.
How to Read Air Bag Warning Lamp
1. Follow the procedures of “PROCEDURE TO CHANG E DIAGNOSIS MODE”, and switch to the diagnosis
mode.
2. Turn ignition switch ON. Check the blinking pattern of air bag warning lamp. There are 2 blinking patterns for the air bag warning lamp as per the following items.
 Front air bag system: 3 second blink followed by a 0.5 second blink repeated.
Air bag warning lamp operation (user mode) SRS condition Reference item
 No malfunction is detected
 No further action is necessary —
 The system is malfunctioning
 Self diagnostic result is not erased af- ter repair Erase “Self Diagnostic Result”
Refer to
SRC-19, "
CONSULT-III
Function", How to Erase Self-diag-
nostic Result
Battery voltage is low (less than 9 V) Check “CAUSE OF WARNING” in
“Special Function” with CONSULT-III
Refer to
SRC-19, "
CONSULT-III
Function"
Intermittent malfunction is detected in
the past Go to
GI-40, "Intermittent Incident"
 Air bag is deployed
 Seat belt pre-tensioner is deployed Go to
SRC-174, "Diagnosis Proce-
dure" or SRC-175, "Diagnosis Pro-
cedure"
 Air bag diagnosis sensor unit is mal-
functioning
 Air bag power supply circuit is mal- functioning
 Air bag warning lamp circuit is mal-
functioning Go to
SRC-193, "
Diagnosis Proce-
dure"
 Air bag diagnosis sensor unit is mal-
functioning
 Air bag warning lamp circuit is mal- functioning Go to
SRC-194, "
Diagnosis Proce-
dure"
SHIA0011E
SHIA0012E
SHIA0013E
SHIA0014E
Revision: 2010 May2011 QX56

SRC-18
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AIR BAG)
How to Erase Self-diagnostic Result
After a malfunction is repaired, turn the ignition swit ch OFF for one second or more, then turn ignition switch
ON. The diagnosis mode returns to the user mode. At that time the self-diagnostic result is cleared.
EXAMPLE OF AIR BAG WARNING LAMP OPERATION IN THE DIAGNOSIS MODE
System Normal
When system is normal.
Single System Malfunction
 Front air bag system
When air bag diagnosis sensor unit system (Item display 1) is malfunctioning.
 Side air bag system When rear curtain air bag module LH syst em (Item display 1) is malfunctioning.
Multiple Systems Malfunction
 Front air bag system
When driver air bag module (Item display 1) and air bag diagnosis sensor unit system (Item display 2) are
malfunctioning.
 Side air bag system
JMHIA0945GB
JMHIA0946GB
JMHIA0948GB
JMHIA0947GB
Revision: 2010 May2011 QX56