Nissan GT-R (2007-2014 year). SRS AIRBAG CONTROL SYSTEM / STEERING CONTROL SYSTEM. Service Manual

• Detects a collision and supplies the energy for deploying air bag and seat belt pre-tensioner.
• Detects electrical malfunction in SRS Air Bag System and Seat Belt Pre-tensioner System, records malfunc-

tion code, and blinking air bag warning lamp.

JMHIA0771GB

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SRS AIR BAG SYSTEM

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< SYSTEM DESCRIPTION >

SRC

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

lamp.

• Indicates malfunctioning portion with blinking times of air bag warning lamp in diagnosis mode.
• Indicates the malfunction record by CONSULT.
• Suppress the deployment of front passenger air bag when front passenger seat is empty or is occupied by a

child or a child-seat.

• When passenger seat is occupied by a child or a child seat, turns ON front 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.

COLLISION MODE

• The operation of supplemental restraint system is different depending on the collision modes applications.

For example, the driver air bag module, front passenger air bag module and front seat belt pre-tensioner are
activated in a frontal collision but not in a side collision.

• SRS configurations that are activated for some collision modes are as per the following.

: Apply

—: Not apply

SRS configuration

Frontal collision

Left side collision

Right side collision

Driver air bag module

—

Front passenger air bag module

—

Front LH seat belt pre-tensioner

—

Front RH seat belt pre-tensioner

—

Front LH side air bag module

—

Front RH side air bag module

—

LH side curtain air bag module

—

RH side curtain air bag module

—

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SRS AIR BAG SYSTEM

Component Parts Location

INFOID:0000000009162962

Component Description

INFOID:0000000009162963

Front passenger air bag module

Driver air bag module

Combination switch (Spiral cable)

LH/RH satellite sensor

Front LH/RH seat belt pre-tensioner

Seat belt buckle switch (Driver side/
Passenger side)

Air bag diagnosis sensor unit

Front LH/RH side air bag module

Crash zone sensor

10. LH/RH side curtain air bag module

11.

Combination meter (air bag warning
lamp)

12. Front passenger air bag OFF indica-

tor

13. Occupant Classification System con-

trol unit

14. Occupant Classification System seat

sensor

View from vehicle side

Passenger front seat

JMHIA0772ZZ

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Component

Function

Air bag diagnosis sensor unit

Detects a collision and supplies power supply for deployment to air bag module and
pre-tensioner seat belt.

Air bag module
• Driver
• Passenger
• Front side
• Side curtain

Receives signal from air bag diagnosis sensor unit and deploys air bag.

Front seat belt pre-tensioner

Receives signal from air bag diagnosis sensor unit and deploys pre-tensioner seat
belt.

Seat belt buckle switch

Controls deployment timing depending on the seat belt condition that is fastened or
unfastened.

Crash zone sensor

Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs.

Satellite sensor (LH/RH)

Transmits signal to air bag diagnosis sensor unit when a side collision occurs.

Occupant Classification System control unit

Detects front passenger seat occupant and judges whether or not deploys front pas-
senger seat air bag.

Combination meter (air bag warning lamp)

Indicates air bag malfunctioning and deployment by blinking and illuminating air bag
warning lamp.

Front passenger air bag OFF indicator

Indicates whether or not front passenger air bag is in activation mode subject to the
judgement by Occupant Classification System control unit.

Combination switch (spiral cable)

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

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OCCUPANT CLASSIFICATION SYSTEM

OCCUPANT CLASSIFICATION SYSTEM

System Diagram

INFOID:0000000009162964

OCCUPANT CLASSIFICATION SYSTEM

System Description

INFOID:0000000009162965

THIS OCCUPANT CLASSIFICATION SYSTEM HAS THE FOLLOWING FUNCTION.

• Suppress the deployment of front passenger air bag when front passenger seat is empty, or when occupied

by child and child-seat. Turns on front passenger air bag OFF indicator when front passenger seat is occu-
pied by child-seat and child.

• Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.
• Indicates the malfunctioning record by CONSULT.
NOTE:
Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from Occu-
pant Classification System

JMHIA0673GB

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

Child/ child-seat

Suppress

OFF

Adult

Enable to deploy

OFF

Malfunction

Suppress

Blinking

OFF

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OCCUPANT CLASSIFICATION SYSTEM

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Component Parts Location

INFOID:0000000009162966

1. Air bag diagnosis sensor unit

2. Occupant Classification System con-

trol unit

3. Occupant Classification System seat

sensor mat

4. Passenger air bag OFF indicator

A. View with rear console assembly re-

moved

B. Front passenger seat

Component parts

Outline of function

Occupant Classification System seat
sensor mat

Detects if the passenger seat is empty or occupied

Occupant Classification System control
unit

Transmits the passenger seat status (occupied or empty) to air bag diagnosis sensor unit

Front passenger air bag OFF indicator

Turns the front passenger air bag OFF indicator lamp ON when the front passenger seat is
occupied by a child or a child-seat

Air bag diagnosis sensor unit

Performs the deploy judgement of passenger air bag based on the information from Occu-
pant Classification System control unit

JMHIA0773ZZ

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< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (AIRBAG)

DIAGNOSIS SYSTEM (AIRBAG)

Diagnosis Description

INFOID:0000000009162967

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-diagnosis results can be read by using air bag warning lamp.
• 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 is as per the following.

: Application, —: Not application

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.

Check that the following parts are in good order.
• Battery (Refer to

PG-3, "How to Handle Battery"

)

• Fuse (Refer to

PG-24, "Fuse"

)

• System component-to-harness connections

Air Bag Warning Lamp Diagnosis

INFOID:0000000009162968

SELF-DIAGNOSIS FUNCTION

• The reading of these results is accomplished by “User mode” and “Diagnosis mode”.
• After a malfunction is repaired, turn ignition switch ON. Diagnosis mode returns to the user mode. At that

time, the self-diagnosis result is cleared.

User mode

Diagnosis mode

Display type

Air bag warning lamp

ON-OFF operation

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DIAGNOSIS SYSTEM (AIRBAG)

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HOW TO CHANGE SELF-DIAGNOSIS MODE WITHOUT CONSULT

DIAGNOSTIC PROCEDURE (USER MODE)

Checking air bag operation according to air bag warning lamp-User mode

Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.

Compare the air bag warning lamp blinking pattern with the
examples.

PHIA0709E

BF-1845D

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DIAGNOSIS SYSTEM (AIRBAG)

Air bag warning lamp examples (User mode)

Air bag warning lamp operation -User mode

SRS condition

• No malfunction is detected
• No further action is necessary

• The system is malfunctioning and needs to be repaired

as indicated

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

• Air bag diagnosis sensor unit is malfunctioning
• Air bag power supply circuit is malfunctioning
• Air bag warning lamp circuit is malfunctioning

• Air bag diagnosis sensor unit is malfunctioning
• Air bag warning lamp circuit is malfunctioning

SHIA0011E

SHIA0012E

SHIA0013E

SHIA0014E

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DIAGNOSIS SENSOR UNIT

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< ECU DIAGNOSIS INFORMATION >

SRC

ECU DIAGNOSIS INFORMATION

DIAGNOSIS SENSOR UNIT

Wiring Diagram - SRS AIR BAG CONTROL SYSTEM -

INFOID:0000000009163142

For connector terminal arrangements, harness layouts, and alphabets in a

(option abbreviation; if not

described in wiring diagram), refer to

GI-12, "Connector Information"

JRHWC0358GB

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DIAGNOSIS SENSOR UNIT

JRHWC0359GB

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PRECAUTIONS

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SRC

PRECAUTION

PRECAUTIONS

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

INFOID:0000000009163145

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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that 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 “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

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

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never 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

INFOID:0000000009163146

• Do not 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 at least 3

minutes.
For approximately 3 minutes after the battery negative terminal is removed, it is still possible for the air bag
and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3
minutes have elapsed.

• 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 in the neutral position since its rotations are limited. Do not 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.

Occupant Classification System Precaution

INFOID:0000000009163147

• Replace Occupant Classification System control unit and passenger front seat cushion as an assembly.

Refer to

SE-49, "Removal and Installation"

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STEERING

SECTION

STC

STC

CONTENTS

STEERING CONTROL SYSTEM

EPS

PRECAUTION ...............................................

PRECAUTIONS ...................................................

Precaution for Working Range at a Regular Deal-
ership ........................................................................

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

Precautions Necessary for Steering Wheel Rota-
tion After Battery Disconnection ...............................

Precaution for Battery Service ..................................

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< PRECAUTION >

[EPS]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Working Range at a Regular Dealership

INFOID:0000000009180800

CAUTION:

The service items unmentioned on this manual are recommended to be performed by a GT-R certified
NISSAN dealer. Because those service items require special equipment and a GT-R certified technical
staff who completed special training.

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

INFOID:0000000009160031

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that 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 “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

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

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

• 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.

Precautions Necessary for Steering Wheel Rotation After Battery Disconnection

INFOID:0000000009160032

CAUTION:

Comply with the following cautions to prevent any error and malfunction.
• Before removing and installing any control units, first turn the ignition switch to the LOCK position,

then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect

both battery cables.

• Always use CONSULT to perform self-diagnosis as a part of each function inspection after finishing

work. If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.

OPERATION PROCEDURE

Connect both battery cables.

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PRECAUTIONS

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< PRECAUTION >

[EPS]

STC

NOTE:
Supply power using jumper cables if battery is discharged.

Turn the ignition switch to ACC position.
(At this time, the steering lock will be released.)

Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.

Perform the necessary repair operation.

When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the ignition switch from ACC position to ON position, then to LOCK position. (The steering wheel will lock
when the ignition switch is turned to LOCK position.)

Perform self-diagnosis check of all control units using CONSULT.

Precaution for Battery Service

INFOID:0000000009160033

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.

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