Nissan Leaf. Manual - part 1102

SYSTEM

SRC-9

< SYSTEM DESCRIPTION >

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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 and seat belt pre-tensioner.

• Detects and records electrical malfunction in air bag system and seat belt pre-tensioner system, and blinking

air bag warning lamp.

• Detects and records the deployment of air bag and seat belt pre-tensioner and turns ON the air bag warning

lamp.

• Indicates malfunctioning portion via the number of blinks from the air bag warning lamp in the diagnosis

mode.

• Indicates the malfunction record via CONSULT.

• Suppresses the deployment of passenger air bag when passenger seat is empty or occupied by child or

child-seat.

• When passenger seat is occupied by child or child seat, turns ON passenger air bag OFF indicator. 

• When judges that passenger seat is occupied by a adult or a child and passenger seat belt is not fasten,

turns ON seat belt warning lamp. Further information for the seat belt warning system.

COLLISION MODES

The operation of SRS is different depending on the collision modes applications. For example, the driver air

bag module, passenger air bag module, and seat belt pre-tensioner are activated in a frontal collision or side

collision.

SRS configurations that are activated for the following collision modes.

×: Apply   —: Not apply

OCCUPANT CLASSIFICATION SYSTEM

Occupant Classification System has the following functions.

1. Suppresses the deployment of passenger air bag when passenger seat is empty, or when occupied by

child and child-seat.

2. Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.

3. Indicates the malfunctioning record by CONSULT.

SRS configuration

Frontal collision

Left side collision

Right side collision

Driver air bag module

×

—

—

Passenger air bag module

×

—

—

Seat belt pre-tensioner LH

×

×

—

Seat belt pre-tensioner RH

×

—

×

Lap pre-tensioner LH

×

×

—

Side air bag module LH

—

×

—

Side air bag module RH

—

—

×

Curtain air bag module LH

—

×

—

Curtain air bag module RH

—

—

×

AWHIA0390GB

SRC-10

< SYSTEM DESCRIPTION >

SYSTEM

4. When “Zero point reset” for occupant detection system is incomplete, CONSULT indicates that “Zero point

reset” is incomplete.

NOTE:

• Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from

Occupant Classification System.

• Even if zero point reset is “Complete”, always perform zero point reset after the removal and installation of

seat or the removal of control unit harness connector. 

Status
(front passenger seat)

Passenger air bag 

Front passenger air 
bag OFF indicator

Air bag warning lamp

Seat belt warning lamp 
(when front passenger 
seat is unbuckled)

Empty

Suppress

OFF

OFF

OFF

An object

Suppress

ON

OFF

OFF

Child/ child-seat

Suppress

ON

OFF

ON

Adult

Enable to deploy

OFF

OFF

ON

Malfunction

Suppress

ON

Blinking

OFF

Zero point reset
Not yet performed 
(NISSAN genuine parts 
only)

Suppress

ON

Blinking

OFF

DIAGNOSIS SYSTEM (AIR BAG)

SRC-11

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (AIR BAG)

Description

INFOID:0000000010122782

CAUTION:

• Never 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 harness

connectors.

• Never 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-diagnostic results can be read with 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

malfunction 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 per the following items.

×: Application, —: Not application

On Board Diagnosis Function

INFOID:0000000010122783

ON-BOARD DIAGNOSIS 

There are two self diagnosis functions with air bag warning lamp per the following items.

• USER MODE

• DIAGNOSIS MODE

METHOD OF STARTING

• Diagnosis mode changes from user mode to diagnosis mode when changing operation is performed.

• In user mode, when SRS air bag warning lamp is not blinking, changing to diagnosis mode by ignition switch

operation is not possible.

• In diagnosis mode, when repair is complete and system is normal, the mode changes to user mode when

ignition switch is turned from OFF to ON.

Procedure to Change Diagnosis Mode

1. Turn ignition switch from OFF to ON.

2. SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 1second after

the lamp turns OFF.

3. After turning ignition switch OFF, wait for 3 seconds or more.

4. Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3times in total.

5. Turn ignition switch from OFF to ON. Diagnosis mode changes.

USER MODE

In USER MODE, air bag warning lamp on combination meter blinks when a malfunction is detected and warns

the customer (driver).

How to Read Air Bag Warning Lamp

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

Air Bag Warning Lamp Examples

Diagnosis tool

User mode

Diagnosis mode

Air bag warning lamp

×

×

CONSULT

–

×

SRC-12

< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (AIR BAG)

DIAGNOSIS MODE

The diagnosis mode can only be switched when a malfunction is detected in the user mode. Malfunctioning

system is indicated according to blinking pattern of air bag warning lamp.

How to Read Air Bag Warning Lamp

1. Follow the procedures of “PROCEDURE TO CHANGE DIAGNOSIS MODE”, and switch to the diagnosis

mode.

Air bag warning lamp operation (user mode) 

SRS condition

Reference item

• No malfunction is detected.
• No further action is necessary.

—

• The system is malfunctioning.
• Self diagnostic result is not erased af-

ter repair.

Erase “Self Diagnostic Result” 
Refer to 

SRC-13, "CONSULT Func-

tion"

, How to Erase Self-diagnostic 

Result.

Battery voltage is low (less than 9 V) or 
high battery voltage (more than 16V).

Check “CAUSE OF WARNING” in 
“Special Function” with CONSULT
Refer to 

SRC-13, "CONSULT Func-

tion"

.

Occupant detection function is dis-
abled.

Refer to 

SRC-15, "CONSULT Func-

tion"

.

Zero point reset is incomplete.

Refer to 

SRC-37, "ZERO POINT 

RESET : Special Repair Require-
ment"

.

Intermittent malfunction is detected in 
the past.

Go to 

GI-53, "Intermittent Incident"

.

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

Go to 

SR-13, "For Frontal Collision"

 

or 

SR-15, "For Side and Rollover 

Collision"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag power supply circuit is mal-

functioning.

• Air bag warning lamp circuit is mal-

functioning.

Go to 

SRC-107, "Diagnosis Proce-

dure"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag warning lamp circuit is mal-

functioning.

Go to 

SRC-108, "Diagnosis Proce-

dure"

.

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