Nissan March K13. Manual - part 616

PRECAUTIONS

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< PRECAUTION >

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PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

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The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.

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

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Service

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• Never use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
• Before servicing the SRS, turn ignition switch OFF, disconnect battery negative terminal and wait 3 minutes

or more.
For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-
tensioner to deploy. Therefore, never work on any SRS connectors or wires until at least 3 minutes have
passed.

• Diagnosis sensor unit must always be installed with their arrow marks “

⇐

” pointing towards the front of the

vehicle for proper operation. Also check diagnosis sensor unit for cracks, deformities or rust before installa-
tion and replace as required.

• The spiral cable must be aligned with the neutral position since its rotations are limited. Never turn steering

wheel and column after removal of steering gear.

• Handle air bag module carefully. Always place driver and front passenger air bag modules with the pad side

facing upward and seat mounted front side air bag module standing with the stud bolt side facing down.

• Conduct self-diagnosis to check entire SRS for proper function after replacing any components.
• After air bag inflates, the front instrument panel assembly should be replaced if damaged.
• Always replace instrument panel pad following front passenger air bag deployment.
• Never solder the harness when making repairs. Check that harness is not pinched and that there is no con-

tact with other components.

• Never allow harness to come in contact with oil, grease, waste oil, or water.
• Never insert foreign materials, such as a screwdriver, into the harness connector. (This is to prevent acci-

dental activation caused by static electricity.)

• Always use CONSULT-III or SRS air bag warning lamp to perform the circuit diagnosis. (Never use an elec-

tric tester such as a circuit tester.)

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COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

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Component Description

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1.

Driver air bag module

2.

Combination switch (spiral cable)

3.

Combination meter
Refer to 

MWI-4, "Component Parts 

Location"

4.

Crash zone sensor

5.

Air bag diagnosis sensor unit

A.

View with bumper fascia assembly 
removed

B.

View with center console assembly 
removed

JMHIA1511ZZ

Component

Function

Air bag diagnosis sensor unit

• Detects a collision and supplies power supply for deployment to 

air bag module.

• It contains the “G” sensors for both frontal collisions and spare 

battery function in case of main battery damage in collision.

Driver air bag module

• Receives signal from air bag diagnosis sensor unit and deploys 

air bag.

• In case of frontal collision where acceleration is more than the 

specified level, the ignition materials are ignited by electric ignition 
system. The system burns the gas generating materials resulting 
in a chemical reaction. This generates hot gases that flow into the 
air bag through a filter and expand the bag.

COMPONENT PARTS

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Crash zone sensor

• Transmits signal to air bag diagnosis sensor unit when a frontal 

collision occurs.

• Crash zone sensor is a G sensor that outputs voltage signal dur-

ing deceleration at the time of a vehicle frontal collision that is 
more than the specified limit is detected. 

Combination switch (spiral cable)

Supplies power supply to driver air bag module on steering wheel.

Combination meter (air bag warning lamp)

Indicates air bag malfunctioning and deployment by blinking and il-
luminating air bag warning lamp.

Component

Function

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SYSTEM

SYSTEM

System Diagram

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System Description

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Supplemental Restraint System (SRS) activates air bag module when it detects a frontal collision that is more
than the specified limit. Together with other safety devices, it reduces the impact that occupant receives when
vehicle collision occurs.
Air bag diagnosis sensor unit supplies power supply to air bag module when deceleration that is more than the
specified limit is detected by G sensor in air bag diagnosis sensor unit, crash zone sensor. Air bag module is
composed of electric igniter (squib), filter, pyrotechnic material, and gas generating material. When air bag
module receives a signal from air bag diagnosis sensor unit, air bag module ignites pyrotechnic material using
electric igniter (squib) so that gas generating material generates high temperature nitrogen gas. The gas
through filter activates air bag.

AIR BAG DIAGNOSIS SENSOR UNIT FUNCTIONS

Air bag diagnosis sensor unit has the following functions.
• Detects a collision and supplies the energy for deploying air bag.
• Frontal collision G sensor is integrated for detecting a collision.
• Additional power supply function is integrated in preparation for battery power supply damage at a collision.
• Detects and records electrical malfunction in air bag system blinks air bag warning lamp.
• Detects and records the deployment of air bag turns ON air bag warning lamp.
• Indicates malfunctioning portion via the number of blinks of the air bag warning lamp in the diagnosis mode.

COLLISION MODES

Collision modes are for a frontal collision only.
SRS configurations are activated for the following collision modes.

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: Apply

JMHIA1510GB

SRS configuration

Frontal collision

Driver air bag module

×