Infiniti M35/M45 Y50. Manual - part 1098

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS-7

SRS

Occupant Classification System (OCS)

NHS0008W

The occupant classification system identifies different size occupants, out of position occupants, and detects if
child seat is present in the front passenger seat. The occupant classification system receives inputs from the
occupant classification sensor (located inside the passenger seat cushion assembly) and belt tension sensor
(part of the passenger front seat belt assembly and located at the belt anchor location). Depending on classifi-
cation of passenger, the occupant classification system sends a signal to the diagnosis sensor unit. The diag-
nosis sensor unit uses this signal to determine full, partial, or non deployment of passenger front air bag in the
event of a collision. Depending on the signal received, the diagnosis sensor unit can disable the passenger
front air bag completely.

NOTE:
In case of customer concern, CONSULT-ll can be used to confirm the passenger air bag status (readiness).

Passenger Air Bag Status Condition

NHS0008X

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

Component Parts of Occupant Classification System

NHS0008Y

Front Passenger Seat

(Condition)

PASS AIR BAG OFF Indicator

(Status)

Passenger Air Bag Status

(Readiness)

CONSULT-ll Display

Seat occupied

OFF

Active (enabled)

seat occupiedNOTE

Deactivated (disabled)

OFF

Seat empty

OFF

Deactivated (disabled)

OFF

PHIA1177E

Occupant classification system con-
trol unit

Belt tension sensor

Seat pressure sensor

Bladder

Front passenger air bag OFF indica-
tor (Cutoff telltaile)

SRS-8

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

Passenger Seatbelt Warning System

NHS0009R

SYSTEM DESCRIPTION

This system warns when passenger seatbelt is not fasten.

This system is composed of the following items.

●

Seatbelt warning lamp.

●

Seatbelt buckle switch (passenger side).

●

Air bag diagnosis sensor unit.

●

Occupant classification system.

Seatbelt warning lamp is used for both driver seatbelt warning and passenger seatbelt warning.
Seatbelt warning lamp turns ON when all conditions below are met.

●

Driver seatbelt is fastened.

●

Occupant is on passenger seat.

●

Passenger seatbelt is not fasten.

TROUBLE DIAGNOSIS

SRS-9

SRS

TROUBLE DIAGNOSIS

PFP:00004

Trouble Diagnosis Introduction

NHS00090

CAUTION:

●

Do not 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 har-
ness connectors.

●

Do not 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-II.
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-II are as follows:

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

Make sure the following parts are in good order.

●

Battery (Refer to

SC-4, "How to Handle Battery"

●

Fuse (Refer to

SRS-13, "Wiring Diagram — SRS —"

●

System component-to-harness connections