Nissan Altima L32. Manual - part 1370

SRC-10

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OCCUPANT CLASSIFICATION SYSTEM

OCCUPANT CLASSIFICATION SYSTEM

System Diagram

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Occupant Classification System (OCS)

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The occupant classification system (OCS) identifies if a child or child seat is present in the front passenger

seat. The OCS receives inputs from the occupant classification sensor mat (located inside the passenger seat

cushion assembly). Depending on classification of the passenger, the OCS control unit 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 front passenger air bag module in the

event of a collision. Depending on the signals received, the air bag diagnosis sensor unit can disable the front

passenger air bag module completely.

NOTE:

In case of customer concern, CONSULT-III can be used to confirm the front passenger air bag status (readi-

ness).

Front Passenger Air Bag Status Conditions

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

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Front Passenger Seat

(Condition)

PASS AIR BAG OFF Indicator

(Status)

Front Passenger Air Bag Status

(Readiness)

CONSULT-III Display

Seat occupied

OFF

Active (enabled)

ON

Seat occupied 

NOTE

ON

Deactivated (disabled)

OFF

Seat empty

OFF

Deactivated (disabled)

OFF

1.

Seat cushion foam

2.

OCS control unit

3.

OCS sensor mat

4.

OCS sensor mat cell (internal)

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PASSENGER SEAT BELT WARNING SYSTEM

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PASSENGER SEAT BELT WARNING SYSTEM

System Diagram

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System Description

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The seat belt warning lamp (1) will remind the driver if the driver or

front passenger seat belt should be buckled.  The system works in

conjunction with the occupant classification system.  Refer to 

SRC-

10, "Occupant Classification System (OCS)"

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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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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

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< FUNCTION DIAGNOSIS >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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

• Fuse

• 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

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

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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-14, "Self-Diagnosis Function (Without CONSULT-

III)"

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“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.

Proceed to DIAGNOSTIC PROCE-
DURE 2 that follows (with CON-
SULT-III) or 

SRC-14, "Trouble 

Diagnosis without CONSULT-III"

 

(without CONSULT-III).

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

Proceed to COLLISION DIAGNO-
SIS 

SR-20, "For Frontal Collision"

 or 

SR-21, "For Side and Rollover Colli-
sion"

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• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag power supply circuit is mal-

functioning.

• SRS air bag warning lamp circuit is 

malfunctioning.

Refer to 

SRC-74, ""AIR BAG" Warn-

ing Lamp Does Not Turn Off"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag warning lamp circuit is mal-

functioning.

Refer to 

SRC-74, ""AIR BAG" Warn-

ing Lamp Does Not Turn On"

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