Nissan Titan. Manual - part 549

OCCUPANT CLASSIFICATION SYSTEM

SRC-11

< SYSTEM DESCRIPTION >

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

WHIA0187E

SRC-12

< SYSTEM DESCRIPTION >

PASSENGER SEAT BELT WARNING SYSTEM

PASSENGER SEAT BELT WARNING SYSTEM

System Diagram

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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

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Refer to 

SRC-7, "SRS Component Parts Location"

.

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ALHIA0056ZZ

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

Seat occupied

Buckled

Buckled

Off

Unbuckled

On

Seat unoccupied

—

Off

—

Unbuckled

On

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRC-13

< SYSTEM DESCRIPTION >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

Trouble Diagnosis Introduction

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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. 

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 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 (Refer to 

PG-4, "How to Handle Battery"

.)

• Fuse (Refer to 

SRC-66, "Wiring Diagram"

.)

• System component-to-harness connections

SRS Operation Check

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DIAGNOSTIC PROCEDURE 1

Checking SRS Operation Using AIR BAG Warning Lamp—User Mode

1. Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.
2. Compare the SRS air bag warning lamp blinking pattern with the

examples.

User mode

Diagnosis mode

Display type

AIR BAG warning lamp

X

X

ON-OFF operation

CONSULT

—

X

Monitoring

BF-1845D

SRC-14

< SYSTEM DESCRIPTION >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRS Air bag warning lamp examples

DIAGNOSTIC PROCEDURE 2

1. Connect CONSULT.
2. 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 CON-

SULT)"

.

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) or 

SRC-15, "Trouble Diagnosis without 
CONSULT"

 (without CONSULT).

• Air bag is deployed.
• Seat belt pre-tensioner is deployed.

Go to COLLISION DIAGNOSIS 

SR-

20, "For Frontal Collision"

 or 

SR-22, 

"For Side and Rollover Collision"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag power supply circuit is mal-

functioning.

• SRS air bag warning lamp circuit is 

malfunctioning.

Go to 

SRC-76, ""AIR BAG" Warning 

Lamp Does Not Turn Off"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag warning lamp circuit is mal-

functioning.

Go to 

SRC-76, ""AIR BAG" Warning 

Lamp Does Not Turn On"

.

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