Nissan Cube. Manual - part 789

SEAT BELT WARNING SYSTEM

SBC-3

< SYSTEM DESCRIPTION >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

SYSTEM DESCRIPTION

SEAT BELT WARNING SYSTEM

System Diagram

INFOID:0000000009949392

System Description

INFOID:0000000009949393

• Turns ON seat belt warning lamp, when the Occupant Detection 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 Detection 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-6, "METER SYSTEM : System Diagram"

JMHIA0685GB

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

SBC-4

< SYSTEM DESCRIPTION >

SEAT BELT WARNING SYSTEM

Component Parts Location

INFOID:0000000009949394

Component Description

INFOID:0000000009949395

1.

Air bag diagnosis sensor unit B13, 
B14, M59
Refer to 

SRC-13, "Component Parts 

Location"

2.

Seat belt buckle switch (passenger 
side) B23

3.

Occupant Detection System control 
unit B12
Refer to 

SRC-13, "Component Parts 

Location"

4.

Seat belt buckle switch (driver side) 
B22

JMHIA1136ZZ

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 Detection System control unit

Judges the passenger seat condition based on the information from Occupant Detec-
tion System control unit

Occupant Detection 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 Detection 
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

SEAT BELT BUCKLE SWITCH

SBC-5

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

DTC/CIRCUIT DIAGNOSIS

SEAT BELT BUCKLE SWITCH

DRIVER SIDE

DRIVER SIDE : Description

INFOID:0000000009949396

• Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt is not fas-

tened, it 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:0000000009949397

1.

CHECK SEAT BELT BUCKLE SWITCH 

 With CONSULT

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:0000000009949398

1.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect seat belt buckle switch (driver side) connector.

3.

Turn ignition switch ON.

4.

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 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

B22

1

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

M34

9

B22

1

Existed

SBC-6

< DTC/CIRCUIT DIAGNOSIS >

SEAT BELT BUCKLE SWITCH

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-93, "Removal and Installation"

.

NO

>> Repair or replace harness.

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.

4.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) 

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

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

Buckle Switch)"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace seat belt buckle (driver side). Refer to 

SB-8, "SEAT BELT BUCKLE : Removal and Instal-

lation"

.

DRIVER SIDE : Component Inspection (Seat Belt Buckle Switch)

INFOID:0000000009949399

1.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

1.

Turn ignition switch OFF

2.

Disconnect seat belt buckle switch connector.

3.

Check continuity between seat belt buckle switch (driver side).

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace seat belt buckle (driver side). Refer to 

SB-8, "SEAT BELT BUCKLE : Exploded View"

PASSENGER SIDE

PASSENGER SIDE : Description

INFOID:0000000009949400

• Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt switch is

not fastened, it 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:0000000009949401

1.

CHECK SEAT BELT WARNING FUNCTION

1.

Sit down in 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?

Combination meter

Ground

Continuity

Connector

Terminal

M34

9

Not existed

Seat belt buckle switch (driver side)

Ground

Continuity

Connector

Terminal

B22

2

Existed

Seat belt buckle switch (driver side)

Condition

Continuity

Terminal

1

2

When driver side seat belt is not fastened

Existed

When driver side seat belt is fastened

Not existed