Nissan GT-R (2007-2014 year). SEAT BELT CONTROL SYSTEM. Service Manual
SBC-1
RESTRAINTS
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SECTION
SBC
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SBC
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CONTENTS
SEAT BELT CONTROL SYSTEM
BASIC INSPECTION . . . . . . . . .
DIAGNOSIS AND REPAIR WORK FLOW . . .
Work Flow . . . . . . . . . . . . . . . .....
SYSTEM DESCRIPTION . . . . . . . ..
SEAT BELT WARNING SYSTEM . . . . . ...
System Diagram . . . . . . . . . . . . . ....
System Description . . . . . . . . . . . . ...
Component Parts Location . . . . . . . . . ....
Component Description . . . . . . . . . . .....
DTC/CIRCUIT DIAGNOSIS . . . . . . ..
SEAT BELT BUCKLE SWITCH . . . . . . ..
DRIVER SIDE . . . . . . . . . . . . . . . ..
DRIVER SIDE : Description . . . . . . . . . ..
DRIVER SIDE : Component Function Check . . ....
DRIVER SIDE : Diagnosis Procedure . . . . . ...
DRIVER SIDE : Component Inspection (Belt
Buckle Switch) . . . . . . . . . . . . . . ...
PASSENGER SIDE . . . . . . . . . . . . .....
PASSENGER SIDE : Description . . . . . . .....
PASSENGER SIDE : Component Function Check
. ..
PASSENGER SIDE : Diagnosis Procedure . . . ..
PASSENGER SIDE : Component Inspection (Belt
Buckle Switch) . . . . . . . . . . . . . . ..
SEAT BELT WARNING LAMP . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ....
SEAT BELT WARNING SYSTEM . . . . .
Wiring Diagram - SEAT BELT WARNING SYS-
TEM - . . . . . . . . . . . . . . . . . ...
ECU DIAGNOSIS INFORMATION . . . ..
DIAGNOSIS SENSOR UNIT . . . . . . . .
Wiring Diagram - SRS AIR BAG CONTROL SYS-
TEM - . . . . . . . . . . . . . . . . . ...
SYMPTOM DIAGNOSIS . . . . . . . ..
SEAT BELT WARNING LAMP DOES NOT
TURN OFF . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
PRECAUTION . . . . . . . . . . . ..
PRECAUTIONS . . . . . . . . . . . . .
Precaution for Seat Belt Service . . . . . . . ..
Precaution for Battery Service . . . . . . . . .
Revision: 2012 November
2014 GT-R
SBC-2
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow
INFOID:0000000009161807
DETAILED FLOW
1.
OBTAIN INFORMATION ABOUT SYMPTOM
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.
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.
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.
4.
IDENTIFY THE MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”
Perform the diagnosis with “Component diagnosis” of the applicable system.
>> GO TO 5.
5.
REPAIR OR REPLACE THE MALFUNCTIONING PARTS
Repair or replace the specified malfunctioning parts.
>> GO TO 6.
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
NO
>> GO TO 3.
Revision: 2012 November
2014 GT-R
SEAT BELT WARNING SYSTEM
SBC-3
< SYSTEM DESCRIPTION >
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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
ON
Adult
ON
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
1.
Combination meter (Seat belt warn-
ing lamp)
2.
Seat belt buckle switch (Driver side)
3.
Seat belt buckle switch (Passenger
side)
4.
Air bag diagnosis sensor unit
5.
Occupant Classification System con-
trol unit
6.
Occupant Classification System seat
sensor
7.
Front passenger air bag OFF indica-
tor
A.
View with rear console assembly re-
moved
B.
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 >
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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
1.
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.
NO
>> Refer to
SBC-5, "DRIVER SIDE : Diagnosis Procedure"
DRIVER SIDE : Diagnosis Procedure
INFOID:0000000009161814
1.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
1.
Turn ignition switch ON.
2.
Check voltage between seat belt buckle switch (driver side) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect combination meter and seat belt buckle switch (driver side) connector.
3.
Check continuity between combination meter harness connector and seat belt buckle switch (driver side)
harness connector.
4.
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
3
Ground
When driver side seat belt is fastened
Battery voltage
When driver side seat belt is not fastened
0
Combination meter
Seat belt buckle switch (driver side)
Continuity
Connector
Terminal
Connector
Terminal
M53
30
B12
3
Existed
Combination meter
Ground
Continuity
Connector
Terminal
M53
30
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.
NO
>> Repair or replace harness between combination meter and seat belt buckle switch (driver side).
3.
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.
NO
>> Repair or replace harness between seat belt buckle switch and ground.
4.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Check seat belt buckle switch (driver side). Refer to
SBC-6, "DRIVER SIDE : Component Inspection (Belt
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (driver side).
DRIVER SIDE : Component Inspection (Belt Buckle Switch)
INFOID:0000000009161815
1.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
1.
Turn ignition switch OFF
2.
Disconnect seat belt buckle switch connector.
3.
Check continuity of seat belt buckle (driver side).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (driver side).
PASSENGER SIDE
PASSENGER SIDE : Description
INFOID:0000000009161816
• 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 switch is
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
1.
CHECK SEAT BELT WARNING FUNCTION
1.
Sit down to passenger seat.
2.
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.
NO
>> Refer to
SBC-7, "PASSENGER SIDE : Diagnosis Procedure"
Seat belt buckle switch (driver side)
Ground
Continuity
Connector
Terminal
B12
2
Existed
Seat belt buckle switch (driver side)
Condition
Continuity
Terminal
2
3
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 >
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PASSENGER SIDE : Diagnosis Procedure
INFOID:0000000009161818
1.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE) CIRCUIT
1.
Turn ignition switch ON.
2.
Check that voltage between seat belt buckle switch (passenger side) and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE) CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air bag diagnosis sensor unit connector and seat belt buckle switch (passenger side) connec-
tor.
3.
Check continuity between air bag diagnosis sensor unit harness connector and seat belt buckle switch
(passenger side) harness connector.
4.
Check continuity between air bag diagnosis sensor unit harness connector and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair or replace harness between air bag diagnosis sensor unit and seat belt buckle switch (pas-
senger side).
3.
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.
NO
>> Repair or replace harness between seat belt buckle switch and ground.
4.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
Check seat belt buckle switch (passenger side). Refer to
SBC-8, "PASSENGER SIDE : Component Inspection
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (passenger side).
(+)
(–)
Condition
Voltage (V)
(Approx.)
Seat belt buckle switch (passenger side)
Connector
Terminal
B212
3
Ground
When passenger side
seat belt is fastened
2.0 or more
When passenger side
seat belt is not fastened
0
Air bag diagnosis sensor unit
Seat belt buckle switch (passenger side)
Continuity
Connector
Terminal
Connector
Terminal
B268
29
B212
3
Existed
Air bag diagnosis sensor unit
Ground
Continuity
Connector
Terminal
B268
29
Not existed
Seat belt buckle switch (passenger side)
Ground
Continuity
Connector
Terminal
B212
2
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
1.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
1.
Turn ignition switch OFF.
2.
Disconnect seat belt buckle switch connector.
3.
Check continuity of seat belt buckle (passenger side).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (passenger side).
Seat belt buckle switch (passenger side)
Condition
Continuity
Terminal
2
3
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 >
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SEAT BELT WARNING LAMP
Diagnosis Procedure
INFOID:0000000009161820
1.
CHECK COMBINATION METER GROUND CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect air bag diagnosis sensor unit connector.
3.
Driver seat belt is fastened.
4.
Turn the ignition switch ON.
5.
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.
NO
>> GO TO 2.
2.
CHECK COMBINATION METER GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect combination meter connector.
3.
Check continuity between combination meter harness connector and air bag diagnosis sensor unit har-
ness connector.
4.
Check continuity between combination meter and ground.
Is the inspection result normal?
YES
>> Replace combination meter.
NO
>> Repair or replace harness between combination meter and air bag diagnosis sensor unit.
(+)
(–)
Voltage (V)
(Approx.)
Air bag diagnosis sensor unit
Connector
Terminal
M157
24
Ground
Battery voltage
Combination meter
Air bag diagnosis sensor unit
Continuity
Connector
Terminal
Connector
Terminal
M53
29
M157
24
Existed
Combination meter
Ground
Continuity
Connector
Terminal
M53
29
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 >
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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 >
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SYMPTOM DIAGNOSIS
SEAT BELT WARNING LAMP DOES NOT TURN OFF
Diagnosis Procedure
INFOID:0000000009161824
1.
CHECK SEAT BELT BUCKLE SWITCH CIRCUIT (DRIVER SIDE)
Check seat belt buckle switch circuit (driver side). Refer to
SBC-5, "DRIVER SIDE : Component Function
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the malfunctioning parts.
2.
.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT (PASSENGER SIDE)
Check seat belt buckle switch circuit (passenger side). Rer to
SBC-6, "PASSENGER SIDE : Component Func-
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the malfunctioning parts.
3.
.CHECK SEAT BELT WARNING LAMP CIRCUIT
Check seat belt warning lamp circuit. Rer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace the malfunctioning parts.
4.
CONFIRM THE OPERATION
Confirm the operation again.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-38, "Intermittent Incident"
.
NO
>> 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 >
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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
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