Infiniti QX56 (Z62). Manual - part 1202

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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 occupant 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 detected 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 receives 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 seat belt pre-tensioner, and turns ON air bag warning

lamp.

• Indicates malfunctioning portion via the number of blinks 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 activated for the following collision modes.

: Apply —: Not apply

OCCUPANT DETECTION SYSTEM

This Occupant Detection System has the following functions.

Suppress the deployment of front passenger air bag when 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.

Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.

Indicates the malfunctioning record by CONSULT-III.

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

—

SYSTEM

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SRC

• 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 perform 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 indicator

Air bag warning lamp

Seat belt warning lamp
(when front passenger
seat is unbuckled)

Empty

Suppress

OFF

An object

Suppress

OFF

Child/ child-seat

Suppress

OFF

Adult

Enable to deploy

OFF

Malfunction

Suppress

Blinking

OFF

Zero point reset
Not yet performed (NIS-
SAN genuine parts
only)

Suppress

Blinking

OFF

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DIAGNOSIS SYSTEM (AIR BAG)

DIAGNOSIS SYSTEM (AIR BAG)

Description

INFOID: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 identified by yellow and/or orange harnesses or harness
connectors.

• Never repair, splice or modify the SRS wiring harness. 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 Diagnosis Function

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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 diagnosis 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

Turn ignition switch from OFF to ON.

SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 1second after
the lamp turns OFF.

After turning ignition switch OFF, wait for 3 seconds or more.

Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3times in total.

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

Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.

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

–

DIAGNOSIS SYSTEM (AIR BAG)

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DIAGNOSIS MODE

The diagnosis mode can only be switched when a malfunction 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

Follow the procedures of “PROCEDURE TO CHANGE DIAGNOSIS MODE”, and switch to the diagnosis
mode.

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