Nissan Quest E52. Manual - part 1121

SYSTEM

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< SYSTEM DESCRIPTION >

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

Occupant Detection 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 (NIS-
SAN genuine parts 
only)

Suppress

ON

Blinking

OFF

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< SYSTEM DESCRIPTION >

SYSTEM

Schematic

INFOID:0000000009649843

JMHIA2033GB

DIAGNOSIS SYSTEM (AIR BAG)

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< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (AIR BAG)

Description

INFOID:0000000009649844

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:0000000009649845

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

×

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CONSULT

–

×

SRC-16

< 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-19, "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-19, "CONSULT Func-

tion"

Occupant detection function is disabled

Refer to 

SRC-203, "Diagnosis Pro-

cedure"

Zero point reset is incomplete

Refer to 

SRC-41, "ZERO POINT 

RESET : Special Repair Require-
ment"

Intermittent malfunction is detected in 
the past

Go to 

GI-42, "Intermittent Incident"

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

Go to 

SRC-168, "Diagnosis Proce-

dure"

 or 

SRC-169, "Diagnosis Pro-

cedure"

• 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-201, "Diagnosis Proce-

dure"

• Air bag diagnosis sensor unit is mal-

functioning

• Air bag warning lamp circuit is mal-

functioning

Go to 

SRC-202, "Diagnosis Proce-

dure"

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