Nissan GT-R (2007-2014 year). SEAT BELT CONTROL SYSTEM. Service Manual

Interview the customer to obtain as much malfunction information (conditions and environment when the mal-
function occurred) as possible when the customer brings the vehicle in.

>> GO TO 2.

REPRODUCE THE MALFUNCTION INFORMATION

Check the malfunction on the vehicle that the customer describes.
Inspect the relation of the symptoms and the condition when the symptoms occur.

>> GO TO 3.

IDENTIFY THE MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS”

Use “Symptom diagnosis” from the symptom inspection result in step 2 and then identify where to start per-
forming the diagnosis based on possible causes and symptoms.

>> GO TO 4.

IDENTIFY THE MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”

Perform the diagnosis with “Component diagnosis” of the applicable system.

>> GO TO 5.

REPAIR OR REPLACE THE MALFUNCTIONING PARTS

Repair or replace the specified malfunctioning parts.

>> GO TO 6.

FINAL CHECK

Check that the malfunction is not reproduced, referring to the symptom inspection result in step 2.
Are the malfunctions corrected?

YES

>> INSPECTION END

>> GO TO 3.

Revision: 2012 November

2014 GT-R

SEAT BELT WARNING SYSTEM

SBC-3

< SYSTEM DESCRIPTION >

SBC

SYSTEM DESCRIPTION

SEAT BELT WARNING SYSTEM

System Diagram

INFOID:0000000009161808

System Description

INFOID:0000000009161809

• Turns ON seat belt warning lamp, when the Occupant Classification System judges adult or child in the front

passenger seat and the passenger seat belt buckle switch is OFF.

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

Occupant Classification System.

• In addition, seat belt warning lamp illuminates, when the driver side seat belt is not fasten. This does not

relate to the air bag diagnosis sensor unit.

• For driver seat belt function, refer to

MWI-3, "METER SYSTEM : System Diagram"

JMHIA0794GB

Status (front passenger seat)

Seat belt warning lamp (When front passenger seat is unbuck-
led)

Empty

OFF

An object

OFF

Child/ child-seat

Adult

Malfunction

OFF

Revision: 2012 November

2014 GT-R

SBC-4

< SYSTEM DESCRIPTION >

SEAT BELT WARNING SYSTEM

Component Parts Location

INFOID:0000000009161810

Component Description

INFOID:0000000009161811

Combination meter (Seat belt warn-
ing lamp)

Seat belt buckle switch (Driver side)

Seat belt buckle switch (Passenger
side)

Air bag diagnosis sensor unit

Occupant Classification System con-
trol unit

Occupant Classification System seat
sensor

Front passenger air bag OFF indica-
tor

View with rear console assembly re-
moved

Front passenger seat

JMHIA0795ZZ

Component parts

Outline of function

Seat belt buckle switch (Driver side)

Detects if the seat belt buckle switch (driver side) is fastened or unfastened

Seat belt buckle switch (Passenger side)

Detects if the seat belt buckle switch (passenger side) is fastened or unfastened

Seat belt warning lamp

Turns the seat belt warning lamp ON when the seat belt is unfastened

Occupant Classification System control unit

Judges the passenger seat condition based on the information from Occupant Classi-
fication System control unit

Occupant Classification System seat sensor

Detects if the passenger seat is empty or occupied

Air bag diagnosis sensor unit

Turns ON seat belt warning lamp based on the information from Occupant Classifica-
tion System control 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

Revision: 2012 November

2014 GT-R

SEAT BELT BUCKLE SWITCH

SBC-5

< DTC/CIRCUIT DIAGNOSIS >

SBC

DTC/CIRCUIT DIAGNOSIS

SEAT BELT BUCKLE SWITCH

DRIVER SIDE

DRIVER SIDE : Description

INFOID:0000000009161812

• Performs the control of tension reducer according to the seat belt buckle switch ON/OFF.
• Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt is not fas-

tened, illuminates the seat belt warning lamp on the combination meter.

• The seat belt buckle switch is installed in the seat belt buckle.

DRIVER SIDE : Component Function Check

INFOID:0000000009161813

CHECK SEAT BELT BUCKLE SWITCH

When checking “BUCKLE SW” in DATA MONITOR in METER/M&A, check that ON/OFF display changes syn-
chronized with the insertion operation to the seat belt buckle.

Is the inspection result normal?

YES

>> Seat belt buckle switch (driver side) circuit is normal.

>> Refer to

SBC-5, "DRIVER SIDE : Diagnosis Procedure"

DRIVER SIDE : Diagnosis Procedure

INFOID:0000000009161814

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT

Turn ignition switch ON.

Check voltage between seat belt buckle switch (driver side) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

>> GO TO 2.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT

Turn ignition switch OFF.

Disconnect combination meter and seat belt buckle switch (driver side) connector.

Check continuity between combination meter harness connector and seat belt buckle switch (driver side)
harness connector.

Check continuity between combination meter harness connector and ground.

Monitor item

Condition

BUCKLE SW

When driver side seat belt is not fastened: ON

When driver side seat belt is fastened: OFF

(+)

(–)

Condition

Voltage (V)

(Approx.)

Seat belt buckle switch (driver side)

Connector

Terminal

B12

Ground

When driver side seat belt is fastened

Battery voltage

When driver side seat belt is not fastened

Combination meter

Seat belt buckle switch (driver side)

Continuity

Connector

Terminal

Connector

Terminal

M53

B12

Existed

Combination meter

Ground

Continuity

Connector

Terminal

M53

Not existed

Revision: 2012 November

2014 GT-R

SBC-6

< DTC/CIRCUIT DIAGNOSIS >

SEAT BELT BUCKLE SWITCH

Is the inspection result normal?

YES

>> Repair or replace combination meter.

>> Repair or replace harness between combination meter and seat belt buckle switch (driver side).

CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT

Check continuity between seat belt buckle switch (driver side) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace harness between seat belt buckle switch and ground.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

Check seat belt buckle switch (driver side). Refer to

SBC-6, "DRIVER SIDE : Component Inspection (Belt

Buckle Switch)"

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace seat belt buckle switch (driver side).

DRIVER SIDE : Component Inspection (Belt Buckle Switch)

INFOID:0000000009161815

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

Turn ignition switch OFF

Disconnect seat belt buckle switch connector.

Check continuity of seat belt buckle (driver side).

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace seat belt buckle switch (driver side).

PASSENGER SIDE

PASSENGER SIDE : Description

INFOID:0000000009161816

not fastened, illuminates the seat belt warning lamp on the combination meter.

• The seat belt buckle switch is installed in the seat belt buckle.

PASSENGER SIDE : Component Function Check

INFOID:0000000009161817

CHECK SEAT BELT WARNING FUNCTION

Sit down to passenger seat.

Check that seat belt warning lamp turns OFF when passenger seat belt is fastened, and then turns ON
when passenger seat belt is unfastened.

Is the inspection result normal?

YES

>> Seat belt buckle switch (passenger side) circuit is normal.

>> Refer to

SBC-7, "PASSENGER SIDE : Diagnosis Procedure"

Seat belt buckle switch (driver side)

Ground

Continuity

Connector

Terminal

B12

Existed

Seat belt buckle switch (driver side)

Condition

Continuity

Terminal

When driver side seat belt is
not fastened

Existed

When driver side seat belt is
fastened

Not existed

Revision: 2012 November

2014 GT-R

SEAT BELT BUCKLE SWITCH

SBC-7

< DTC/CIRCUIT DIAGNOSIS >

SBC

PASSENGER SIDE : Diagnosis Procedure

INFOID:0000000009161818

CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE) CIRCUIT

Turn ignition switch ON.

Check that voltage between seat belt buckle switch (passenger side) and ground.

Is the inspection result normal?

YES

>> GO TO 3.

>> GO TO 2.

CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE) CIRCUIT

Turn ignition switch OFF.

Disconnect air bag diagnosis sensor unit connector and seat belt buckle switch (passenger side) connec-
tor.

Check continuity between air bag diagnosis sensor unit harness connector and seat belt buckle switch
(passenger side) harness connector.

Check continuity between air bag diagnosis sensor unit harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

>> Repair or replace harness between air bag diagnosis sensor unit and seat belt buckle switch (pas-

senger side).

CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT

Check continuity between seat belt buckle switch (passenger side) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace harness between seat belt buckle switch and ground.

CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)

Check seat belt buckle switch (passenger side). Refer to

SBC-8, "PASSENGER SIDE : Component Inspection

(Belt Buckle Switch)"

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace seat belt buckle switch (passenger side).

(+)

(–)

Condition

Voltage (V)

(Approx.)

Seat belt buckle switch (passenger side)

Connector

Terminal

B212

Ground

When passenger side
seat belt is fastened

2.0 or more

When passenger side
seat belt is not fastened

Air bag diagnosis sensor unit

Seat belt buckle switch (passenger side)

Continuity

Connector

Terminal

Connector

Terminal

B268

B212

Existed

Air bag diagnosis sensor unit

Ground

Continuity

Connector

Terminal

B268

Not existed

Seat belt buckle switch (passenger side)

Ground

Continuity

Connector

Terminal

B212

Existed

Revision: 2012 November

2014 GT-R

SBC-8

< DTC/CIRCUIT DIAGNOSIS >

SEAT BELT BUCKLE SWITCH

PASSENGER SIDE : Component Inspection (Belt Buckle Switch)

INFOID:0000000009161819

CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)

Turn ignition switch OFF.

Disconnect seat belt buckle switch connector.

Check continuity of seat belt buckle (passenger side).

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace seat belt buckle switch (passenger side).

Seat belt buckle switch (passenger side)

Condition

Continuity

Terminal

When driver side seat belt is
not fastened

Existed

When driver side seat belt is
fastened

Not existed

Revision: 2012 November

2014 GT-R

SEAT BELT WARNING LAMP

SBC-9

< DTC/CIRCUIT DIAGNOSIS >

SBC

SEAT BELT WARNING LAMP

Diagnosis Procedure

INFOID:0000000009161820

CHECK COMBINATION METER GROUND CIRCUIT

Turn the ignition switch OFF.

Disconnect air bag diagnosis sensor unit connector.

Driver seat belt is fastened.

Turn the ignition switch ON.

Check that voltage between air bag diagnosis sensor unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace air bag diagnosis sensor unit.

>> GO TO 2.

CHECK COMBINATION METER GROUND CIRCUIT

Turn ignition switch OFF.

Disconnect combination meter connector.

Check continuity between combination meter harness connector and air bag diagnosis sensor unit har-
ness connector.

Check continuity between combination meter and ground.

Is the inspection result normal?

YES

>> Replace combination meter.

>> Repair or replace harness between combination meter and air bag diagnosis sensor unit.

(+)

(–)

Voltage (V)

(Approx.)

Air bag diagnosis sensor unit

Connector

Terminal

M157

Ground

Battery voltage

Combination meter

Air bag diagnosis sensor unit

Continuity

Connector

Terminal

Connector

Terminal

M53

M157

Existed

Combination meter

Ground

Continuity

Connector

Terminal

M53

Not existed

Revision: 2012 November

2014 GT-R

SBC-10

< DTC/CIRCUIT DIAGNOSIS >

SEAT BELT WARNING SYSTEM

SEAT BELT WARNING SYSTEM

Wiring Diagram - SEAT BELT WARNING SYSTEM -

INFOID:0000000009161821

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

(option abbreviation; if not

described in wiring diagram), refer to

GI-12, "Connector Information"

JRHWC0357GB

Revision: 2012 November

2014 GT-R

DIAGNOSIS SENSOR UNIT

SBC-11

< ECU DIAGNOSIS INFORMATION >

SBC

ECU DIAGNOSIS INFORMATION

DIAGNOSIS SENSOR UNIT

Wiring Diagram - SRS AIR BAG CONTROL SYSTEM -

INFOID:0000000009161823

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

Revision: 2012 November

2014 GT-R

SBC-12

< ECU DIAGNOSIS INFORMATION >

DIAGNOSIS SENSOR UNIT

JRHWC0359GB

Revision: 2012 November

2014 GT-R

SEAT BELT WARNING LAMP DOES NOT TURN OFF

SBC-13

< SYMPTOM DIAGNOSIS >

SBC

SYMPTOM DIAGNOSIS

SEAT BELT WARNING LAMP DOES NOT TURN OFF

Diagnosis Procedure

INFOID:0000000009161824

CHECK SEAT BELT BUCKLE SWITCH CIRCUIT (DRIVER SIDE)

Check seat belt buckle switch circuit (driver side). Refer to

SBC-5, "DRIVER SIDE : Component Function

Check"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace the malfunctioning parts.

.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT (PASSENGER SIDE)

Check seat belt buckle switch circuit (passenger side). Rer to

SBC-6, "PASSENGER SIDE : Component Func-

tion Check"

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace the malfunctioning parts.

.CHECK SEAT BELT WARNING LAMP CIRCUIT

Check seat belt warning lamp circuit. Rer to

SBC-9, "Diagnosis Procedure"

Is the inspection result normal?

YES

>> GO TO 4.

>> Repair or replace the malfunctioning parts.

CONFIRM THE OPERATION

Confirm the operation again.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-38, "Intermittent Incident"

>> GO TO 1.

Revision: 2012 November

2014 GT-R

SBC-14

< PRECAUTION >

PRECAUTIONS

PRECAUTION

PRECAUTIONS

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

INFOID:0000000009161826

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.

Precaution for Seat Belt Service

INFOID:0000000009161827

CAUTION:

• Before removing the seat belt pre-tensioner assembly, turn the ignition switch off, disconnect the

both battery cables and wait at least 3 minutes.

• Do not use electrical test equipment for seat belt pre-tensioner connector.
• After replacing or reinstalling seat belt pre-tensioner assembly, or reconnecting front seat belt pre-

tensioner connector, check the system function. Refer to

SRC-8, "Diagnosis Description"

• Do not use disassemble buckle or seat belt assembly.
• Replace anchor bolts if they are deformed or worn out.
• Never oil tongue and buckle.
• If any component of seat belt assembly is questionable, do not repair. Replace the whole seat belt

assembly.

• If webbing is cut, frayed, or damaged, replace seat belt assembly.
• When replacing seat belt assembly, use a genuine NISSAN seat belt assembly.

AFTER A COLLISION

WARNING:

Inspect all seat belt assemblies including retractors and attaching hardware after any collision.
NISSAN recommends that all seat belt assemblies in use during a collision be replaced unless the col-
lision was minor and the belts show no damage and continue to operate properly. Failure to do so
could result in serious personal injury in an accident. Seat belt assemblies not in use during a colli-
sion should also be replaced if either damage or improper operation is noted. Seat belt pre-tensioner
should be replaced even if the seat belts are not in use during a frontal collision in which the air bags
are deployed.

Revision: 2012 November

2014 GT-R

PRECAUTIONS

SBC-15

< PRECAUTION >

SBC

Replace any seat belt assembly (including anchor bolts) if:
• The seat belt was in use at the time of a collision (except for minor collisions and the belts, retractors and

buckles show no damage and continue to operate properly).

• The seat belt was damaged in an accident. (i.e. torn webbing, bent retractor or guide).
• The seat belt attaching point was damaged in an accident. Inspect the seat belt attaching area for damage

or distortion and repair as necessary before installing a new seat belt assembly.

• Anchor bolts are deformed or worn out.
• The seat belt pre-tensioner should be replaced even if the seat belts are not in use during the collision in

which the air bags are deployed.

Precaution for Battery Service

INFOID:0000000009161828

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.

Revision: 2012 November

2014 GT-R

///////////////////////////////////////