Infiniti FX35, FX50 (S51). Manual - part 1712

 

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Infiniti FX35, FX50 (S51). Manual - part 1712

 

 

SRS AIR BAG SYSTEM

SRC-13

< SYSTEM DESCRIPTION >

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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.

Air bag module
• Driver
• Passenger
• Front side
• Side curtain

Receives signal from air bag diagnosis sensor unit and deploys air bag.

Front seat belt pre-tensioner

Receives signal from air bag diagnosis sensor unit and deploys pre-tensioner seat 
belt.

Seat belt buckle switch

Controls deployment timing depending on the seat belt condition that is fastened or 
unfastened.

Crash zone sensor

Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs.

Satellite sensor (LH/RH)

Transmits signal to air bag diagnosis sensor unit when a side collision occurs.

Occupant Detection System

Detects front passenger seat occupant and judges whether or not deploys front pas-
senger seat air bag.

Combination meter (air bag warning lamp)

Indicates air bag malfunctioning and deployment by blinking and illuminating air bag 
warning lamp.

Front passenger air bag OFF indicator

Indicates whether or not front passenger air bag is in activation mode subject to the 
judgement by occupant detection system.

Combination switch (spiral cable)

Supplies power supply to driver air bag module on steering wheel.

SRC-14

< SYSTEM DESCRIPTION >

OCCUPANT DETECTION SYSTEM

OCCUPANT DETECTION SYSTEM

System Diagram

INFOID:0000000005241053

OCCUPANT DETECTION SYSTEM

System Description

INFOID:0000000005241054

This Occupant Detection System has the following functions.

1.

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.

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:
• 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.

JMHIA0683GB

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

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

OFF

OFF

OCCUPANT DETECTION SYSTEM

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< SYSTEM DESCRIPTION >

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Component Parts Location

INFOID:0000000005241055

Component Description

INFOID:0000000005241056

1.

Air bag diagnosis sensor unit

2.

Occupant Detection System control 
unit 

3.

Occupant Detection System sensor

4.

Passenger air bag OFF indicator

A.

View with center console assembly 
removed

B.

Backside of the seat cushion

JMHIA0688ZZ

Component parts

Outline of function

Occupant Detection System sensor

Detects if the passenger seat is empty or occupied

Occupant Detection System control unit

Transmits the passenger seat status (occupied or empty) to air bag diagnosis sensor unit

Front passenger air bag OFF indicator

Turns the front passenger air bag OFF indicator lamp ON when the front passenger seat is 
occupied by a child or a child-seat

Air bag diagnosis sensor unit

Performs the deploy judgement of passenger air bag based on the information from Occu-
pant Detection System control unit

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< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (AIRBAG)

DIAGNOSIS SYSTEM (AIRBAG)

Diagnosis Description

INFOID:0000000005241057

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-diagnosis results can be read by using 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.

×

: Application, —: Not application

HOW TO PERFORM TROUBLE DIAGNOSIS FOR QUICK AND ACCURATE REPAIR

A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.

Information from Customer.

• WHAT..... Vehicle model.
• WHEN..... Date, Frequencies.
• WHERE..... Road conditions.
• HOW..... Operating conditions, Symptoms.

Preliminary Check.

Check that the following parts are in good order.
• Battery (Refer to 

PG-3, "How to Handle Battery"

).

• Fuse (Refer to 

PG-128, "Fuse"

).

• System component-to-harness connections.

Air Bag Warning Lamp Diagnosis

INFOID:0000000005241058

SELF-DIAGNOSIS FUNCTION

• The reading of these results is accomplished by “User mode” and “Diagnosis mode”.
• After a malfunction is repaired, turn ignition switch ON. Diagnosis mode returns to the user mode. At that

time, the self-diagnosis result is cleared.

User mode

Diagnosis mode

Display type

Air bag warning lamp

X

X

ON-OFF operation

CONSULT-III

X

Monitoring

 

 

 

 

 

 

 

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