Nissan Cube. Manual — part 789
SEAT BELT WARNING SYSTEM
SBC-3
< SYSTEM DESCRIPTION >
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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
2.
Seat belt buckle switch (passenger
side) B23
3.
Occupant Detection System control
unit B12
Refer to
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 >
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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
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-
.
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
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