sensor INFINITI QX56 2011 Factory Service Manual

COMPONENT PARTSSRC-9
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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

SYSTEMSRC-13
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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

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-16
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AIR BAG)
 Side air bag system: Two 1.5 second blinks followed by a 0.5 second blink repeated.
Front air bag system
Number of 0.5 second blinks Malfunctioning items Blinking pattern0  Self-diagnostic result is not erased after repair
 Intermittent malfunction is detected in the past Refer to the following items
 Refer to How to Erase Self-di-
agnostic Result
 GI-40, "
Intermittent Incident"
1 Seat belt pre-tensioner RH Refer to the following items

SRC-83, "
DTC Logic"
SRC-85, "DTC Logic"
SRC-87, "DTC Logic"
SRC-89, "DTC Logic"
2 Driver air bag module Refer to the following items

SRC-63, "
DTC Logic"
SRC-65, "DTC Logic"
SRC-67, "DTC Logic"
SRC-69, "DTC Logic"
SRC-81, "DTC Logic"
3 Seat belt pre-tensioner LH Refer to the following items

SRC-91, "
DTC Logic"
SRC-93, "DTC Logic"
SRC-95, "DTC Logic"
SRC-97, "DTC Logic"
SRC-177, "DTC Logic"
5 Occupant detction system control unit Refer to the following items

SRC-44, "
DTC Logic"
SRC-46, "DTC Logic"
SRC-48, "DTC Logic"
SRC-52, "DTC Logic"
SRC-179, "DTC Logic"
6 Crash zone sensor Refer to the following items

SRC-55, "
DTC Logic"
SRC-57, "DTC Logic"
SRC-59, "DTC Logic"
SRC-60, "DTC Logic"
7 Air bag diagnosis sensor unit Refer to the following items

SRC-41, "
DTC Logic"
SRC-42, "DTC Logic"
SRC-43, "DTC Logic"
SRC-54, "DTC Logic"
SRC-62, "DTC Logic"
SRC-71, "DTC Logic"
SRC-80, "DTC Logic"
SRC-99, "DTC Logic"
SRC-100, "DTC Logic"
SRC-111, "DTC Logic"
SRC-128, "DTC Logic"
SRC-146, "DTC Logic"
SRC-147, "DTC Logic"
SRC-156, "DTC Logic"
SRC-173, "DTC Logic"
SRC-181, "DTC Logic"
SRC-182, "DTC Logic"
8 Passenger air bag module Refer to the following items

SRC-72, "
DTC Logic"
SRC-74, "DTC Logic"
SRC-76, "DTC Logic"
SRC-78, "DTC Logic"
11 Front passenger air bag OFF indicator Refer to SRC-50, "DTC Logic"
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (AIR BAG)SRC-17
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Side air bag system
12 Lap pre-tensioner RH Refer to the following items

SRC-148, "
DTC Logic"
SRC-149, "DTC Logic"
SRC-150, "DTC Logic"
SRC-151, "DTC Logic"
13 Lap pre-tensioner LH Refer to the following items

SRC-152, "
DTC Logic"
SRC-153, "DTC Logic"
SRC-154, "DTC Logic"
SRC-155, "DTC Logic"
17 Air bag diagnosis sensor unit Refer to SRC-129, "DTC Logic"
Number of 0.5-second blinks Malfunctioning items Blinking pattern
1 Side air bag module RH Refer to the following items

SRC-112, "
DTC Logic"
SRC-114, "DTC Logic"
SRC-116, "DTC Logic"
SRC-118, "DTC Logic"
2 Side air bag module LH Refer to the following items

SRC-120, "
DTC Logic"
SRC-122, "DTC Logic"
SRC-124, "DTC Logic"
SRC-126, "DTC Logic"
3 Front satellite sensor RH Refer to the following items

SRC-101, "DTC Logic"
SRC-103, "DTC Logic"
SRC-105, "DTC Logic"
4 Front satellite sensor LH Refer to the following items

SRC-106, "DTC Logic"
SRC-108, "DTC Logic"
SRC-110, "DTC Logic"
5 Rear curtain air bag module RH Refer to the following items

SRC-130, "
DTC Logic"
SRC-132, "DTC Logic"
SRC-134, "DTC Logic"
SRC-136, "DTC Logic"
6 Rear curtain air bag module LH Refer to the following items

SRC-138, "
DTC Logic"
SRC-140, "DTC Logic"
SRC-142, "DTC Logic"
SRC-147, "DTC Logic"
7 Front curtain air bag module RH Refer to the following items

SRC-157, "
DTC Logic"
SRC-159, "DTC Logic"
SRC-161, "DTC Logic"
SRC-163, "DTC Logic"
8 Front curtain air bag module LH Refer to the following items

SRC-165, "
DTC Logic"
SRC-167, "DTC Logic"
SRC-169, "DTC Logic"
SRC-171, "DTC Logic"
11 Rear satellite sensor RH Refer to the following items

SRC-183, "DTC Logic"
SRC-185, "DTC Logic"
SRC-187, "DTC Logic"
12 Rear satellite sensor LH Refer to the following items

SRC-188, "DTC Logic"
SRC-190, "DTC Logic"
SRC-192, "DTC Logic"
Number of 0.5 second blinks Malfunctioning items Blinking pattern
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

DIAGNOSIS SYSTEM (AIR BAG)SRC-19
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When front satellite sensor LH (Item display1) and r ear curtain air bag module LH system (Item display 2)
are malfunctioning.
 Front air bag system and side air bag system When driver air bag module (Item display 1) and front satellite sensor RH (Item display2) are malfunctioning.
CONSULT-III FunctionINFOID:0000000006219954
APPLICATION ITEM
CONSULT-III performs the following functions.
HOW TO ERASE SELF DIAGNOSTIC RESULTS
 “Self Diagnostic Result”
A current self-diagnostic result is displayed on CONSULT-III screen in real time.
After the malfunction is repaired completely, no malfunction is detected on “Self Diagnostic Result”.
 “SELF-DIAG [PAST]” Return to “Self Diagnostic Result” CONSULT-III scr een by touching the “BACK” key of CONSULT-III and
select “Self Diagnostic Result” in SELECT DIAG MO DE. Touch “Erase” in “Self Diagnostic Result” mode.
NOTE:
If the memory of the malfunction in “SELF-DIAG [P AST]” is not erased, the user mode shows the system
malfunction by the illumination of the warning lamp even if the malfunction is repaired completely.
 “TROUBLE DIAG RECORD”
JMHIA0949GB
JMHIA0950GB
Diagnosis mode Description
Ecu Identification Air bag diagnosis sensor unit ECU discriminated number (identification num-
ber) is displayed. Air bag diagnosis sensor unit has individual ECU discriminat-
ed number (identification number) based on model and equipment.
Self Diagnostic Result The current self diagnosis results (also indicated with the number of air bag
warning lamp blinks in the diagnosis mode) are displayed on CONSULT-III
screen in real time. This refers to a malfunctioning part requiring repairs.
Refer to
SRC-22, "
DTCIndex".
Function Test CAR COMPUTER DIAG. Test result is indicated using “OK” or “NG” so that the customer recognizes eas-
ily.
Special function SELF-DIAG [PAST]
Diagnosis results previously stored in the memory are displayed on CONSULT-
III screen. The stored results are not erased until memory erasing is executed.
TROUBLE DIAG RECORD With TROUBLE DIAG RECORD, diagnosis results previously erased by a re-
set operation can be displayed on CONSULT-III screen.
SELF-DIAG RESULT [CAN] This item is displayed, but cannot be supported.
CAUSE OF WARNING It displays the cause of warning lamp illumination that is not recorded in mem-
ory.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (OCCUPANT DETECTION SYSTEM)
SRC-21
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DIAGNOSIS SYSTEM (OCCUP ANT DETECTION SYSTEM)
CONSULT-III FunctionINFOID:0000000006219955
ZERO POINT RESET DESCRIPTION
This vehicle adopts occupant detection system with a we ight detecting method. When replacing, or removing
and installing passenger seat, always perform “zero point rest” so that the vehicle recognizes zero point.
If zero point reset is incomplete, occupant detection sensor does not operate normally.
WORK SUPPORT
Monitor item Description
Zero point reset function Perform zero point reset. Refer to
SRC-39, "
ZERO POINT RE-
SET : Special Repair Requirement".
Revision: 2010 May2011 QX56