Nissan Frontier D40. Manual - part 990

SRC-12

< FUNCTION DIAGNOSIS >

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"

.

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

Seat occupied

Buckled

Buckled

Off

Unbuckled

On

Seat unoccupied

—

Off

—

Unbuckled

On

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRC-13

< FUNCTION DIAGNOSIS >

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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-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

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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-III

—

X

Monitoring

BF-1845D

SRC-14

< FUNCTION DIAGNOSIS >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRS Air bag warning lamp examples

DIAGNOSTIC PROCEDURE 2

1.

Connect CONSULT-III.

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 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).

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

Go to COLLISION DIAGNOSIS 

SR-

18, "For Frontal Collision"

 or 

SR-19, 

"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-86, ""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-86, ""AIR BAG" Warning 

Lamp Does Not Turn On"

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SHIA0011E

SHIA0012E

SHIA0013E

SHIA0014E

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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Trouble Diagnosis without CONSULT-III

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DIAGNOSTIC PROCEDURE 6

Inspect SRS Malfunction Using "AIR BAG" Warning Lamp—Diagnosis Mode

NOTE:
SRS will not enter Diagnosis mode if no malfunction is detected in User mode.

1.

Turn ignition switch ON.

2.

After “AIR BAG” warning lamp lights for 7 seconds, turn ignition switch OFF within 1 second.

3.

Wait more than 3 seconds.

4.

Repeat steps 1 to 3 two more times (3 times total).

5.

Turn ignition switch ON.

SRS is now in Diagnosis mode.  Refer to 

SRC-82, "Trouble Diagnosis without CONSULT-III"

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CONSULT-III Function (AIR BAG)

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CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

Self-Diagnosis Function (Without CONSULT-III)

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• The reading of these results is accomplished using one of two modes —“User mode” and “Diagnosis mode”.
• After a malfunction is repaired, turn the ignition switch OFF for at least one second, then back ON. Diagnosis

mode returns to the User mode. At that time, the self-diagnostic result is cleared.

AIR BAG diagnostic mode

Description

SELF-DIAG [CURRENT]

A current Self-diagnosis result (also indicated by the number of warning lamp flashes in the Diagnosis 
mode) is displayed on the CONSULT-III screen in real time. This refers to a malfunctioning part requir-
ing repairs.

SELF-DIAG [PAST]

Diagnosis results previously stored in the memory are displayed on the CONSULT-III screen. The 
stored results will remain until memory erasing is executed.

TROUBLE DIAG RECORD

With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT-III screen.

ECU DISCRIMINATED NO.

Air bag diagnosis sensor unit ECU discriminated number (identification number) is displayed.  Air bag 
diagnosis sensor unit has individual ECU discriminated number (identification number) based on model 
and equipment.

PASSENGER AIR BAG

The STATUS (readiness) of the front passenger air bag module is displayed.  The STATUS displayed 
(ON/OFF) depends on the signals supplied to the occupant classification system control module and 
air bag diagnosis sensor unit.  Refer to 

SRC-10, "Occupant Classification System (OCS)"

  for more in-

formation.