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Nissan Pathfinder (2009 year). Manual - part 600

SRC-6

< FUNCTION DIAGNOSIS >

SRS AIR BAG SYSTEM

FUNCTION DIAGNOSIS

SRS AIR BAG SYSTEM

SRS Configuration

INFOID:0000000003937569

The air bag deploys if the air bag diagnosis sensor unit is activated while the ignition switch is in the ON or
START position.
The collision modes for which supplemental restraint systems are activated are different among the SRS sys-
tems. For example, the driver air bag module, front passenger air bag module and front seat belt pre-tension-
ers are activated in a frontal collision but not in a side collision.
SRS configurations for some collision modes are as follows:

AWHIA0235GB

SRS configuration

Frontal collision

Left side collision

Right side colli-

sion

Rollover

Driver air bag module

—

Front passenger air bag module

—

Front LH seat belt pre-tensioner

—

Front RH seat belt pre-tensioner

—

Front LH side air bag module

—

Front RH side air bag module

—

LH side curtain air bag module

—

RH side curtain air bag module

—

2009 Pathfinder

SRS AIR BAG SYSTEM

SRC-7

< FUNCTION DIAGNOSIS >

SRC

SRS Component Parts Location

INFOID:0000000003937570

Driver Air Bag Module

INFOID:0000000003937571

The driver air bag module is dual stage and located in the steering
wheel assembly. It operates with the SRS system in a frontal colli-
sion exceeding a specified level.

Side curtain air bag modules

Front RH side air bag module

Front RH seat belt pre-tensioner

Belt tension sensor

Seat belt buckle switch RH

RH side air bag (satellite) sensor

Occupant classification system sen-
sor

Occupant classification system
control unit

Front passenger air bag off indicator

10. Front passenger air bag module

11.

Crash zone sensor

12. Air bag warning lamp

13. Spiral cable

14. Driver air bag module

15. LH side air bag (satellite) sensor

16. Front LH seat belt pre-tensioner

17. Air bag diagnosis sensor unit

18. Front LH side air bag module

WHIA0196E

WHIA0325E

2009 Pathfinder

SRS AIR BAG SYSTEM

SRC-9

< FUNCTION DIAGNOSIS >

SRC

Direct-connect SRS Component Connectors

INFOID:0000000003937576

The following SRS components use direct-connect style harness connectors.
• Driver air bag module
• Front passenger air bag module
• LH side front curtain air bag module
• LH side rear curtain air bag module
• RH side front curtain air bag module
• RH side rear curtain air bag module
• Front LH seat belt pre-tensioner
• Front RH seat belt pre-tensioner
Always pull up to release locking tab prior to removing connector from SRS component.
Always push down to lock locking tab after installing connector to
SRS component. When locked, the locking tab is level with the con-
nector housing.

WHIA0103E

2009 Pathfinder

SRC-10

< FUNCTION DIAGNOSIS >

OCCUPANT CLASSIFICATION SYSTEM

OCCUPANT CLASSIFICATION SYSTEM

System Diagram

INFOID:0000000003937577

Occupant Classification System (OCS)

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The occupant classification system (OCS) identifies different size occupants, out of position occupants, and
detects if child seat is present in the front passenger seat. The OCS receives inputs from the occupant classi-
fication sensor (located inside the passenger seat cushion assembly) and belt tension sensor (part of the pas-
senger front seat belt assembly and located at the belt anchor location). Depending on classification of the
passenger, the OCS sends a signal to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit
uses this signal and the seat belt buckle switch RH signal to determine deployment or non deployment of the
passenger front air bag in the event of a collision. Depending on the signals received, the air bag diagnosis
sensor unit can disable the passenger front air bag completely.
NOTE:
In case of customer concern, CONSULT-III can be used to confirm the passenger air bag status (readiness).

Passenger Air Bag Status Conditions

NOTE:

ALHIA0042GB

Front Passenger Seat

(Condition)

PASS AIR BAG OFF Indicator

(Status)

Passenger Air Bag Status

(Readiness)

CONSULT-III Display

Seat occupied

OFF

Active (enabled)

Seat occupied

NOTE

Deactivated (disabled)

OFF

Seat empty

OFF

Deactivated (disabled)

OFF

2009 Pathfinder

OCCUPANT CLASSIFICATION SYSTEM

SRC-11

< FUNCTION DIAGNOSIS >

SRC

Passenger does not meet Occupant Classification System specifications for passenger air bag activation.

WHIA0195E

2009 Pathfinder

SRC-12

< FUNCTION DIAGNOSIS >

PASSENGER SEAT BELT WARNING SYSTEM

PASSENGER SEAT BELT WARNING SYSTEM

System Diagram

INFOID:0000000003937579

System Description

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The passenger seat belt warning system will remind the driver if the
driver or front passenger seat belt should be buckled by turning on
the seat belt warning light (1). The system works in conjunction with
the occupant classification system. Refer to

SRC-10, "Occupant

Classification System (OCS)"

Passenger Seat Belt Warning System Operation

Component Parts Location

INFOID:0000000003937581

Refer to

SRC-7, "SRS Component Parts Location"

ALHIA0028GB

ALHIA0043ZZ

Driver seat status
(Ignition switch ON)

Passenger seat status

Seat belt buckle switch
LH status

Seat belt buckle switch
RH status

Seat belt warning lamp

Seat occupied

Buckled

Off

Unbuckled

Seat unoccupied

—

Off

—

Unbuckled

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRC-13

< FUNCTION DIAGNOSIS >

SRC

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Trouble Diagnosis Introduction

INFOID:0000000003937582

CAUTION:

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in

this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness con-
nectors.

• Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it

with a new one.

• Keep ground connections 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 mal-
function 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 follows:

HOW TO PERFORM TROUBLE DIAGNOSES 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
• Fuses
• System component-to-harness connections

SRS Operation Check

INFOID:0000000003937583

DIAGNOSTIC PROCEDURE 1

Checking SRS Operation Using “AIR BAG” Warning Lamp—User Mode

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

Compare the SRS air bag warning lamp blinking pattern with the
examples.

User mode

Diagnosis mode

Display type

“AIR BAG” warning lamp

ON-OFF operation

CONSULT-III

—

Monitoring

BF-1845D

2009 Pathfinder

SRC-14

< FUNCTION DIAGNOSIS >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRS Air bag warning lamp examples

DIAGNOSTIC PROCEDURE 2

Connect CONSULT-III.

Diagnostic code is displayed on "SELF-DIAG [CURRENT]".
If no malfunction is detected on "SELF-DIAG [CURRENT]", but malfunction is detected in "SRS Operation
Check" using the "AIR BAG" warning lamp, the following cases may exist:
• "SELF-DIAG [PAST]" memory might not be erased.
• The SRS system malfunctions intermittently.
Perform DIAGNOSTIC PROCEDURE 4. Refer to

SRC-15, "Self-Diagnosis Function (Without CONSULT-

III)"

“AIR BAG” warning lamp (User mode)

SRS condition

Reference item

• No malfunction is detected.
• No further action is necessary.

—

The system is malfunctioning and
needs to be repaired as indicated.

Go to DIAGNOSTIC PROCEDURE
2 that follows (with CONSULT-III) or

SRC-15, "Trouble Diagnosis without
CONSULT-III"

(without CONSULT-

III).