Nissan GT-R. Manual - part 261

SEAT BELT BUCKLE SWITCH

SBC-5

< DTC/CIRCUIT DIAGNOSIS >

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SBC

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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

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

Buckle Switch)"

.

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

SEAT BELT BUCKLE SWITCH

SBC-7

< DTC/CIRCUIT DIAGNOSIS >

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SBC

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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

(Belt Buckle Switch)"

.

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

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