Nissan Qashqai (2007-2010). Manual - part 764

SBC-4

< FUNCTION DIAGNOSIS >

SEAT BELT WARNING LAMP

FUNCTION DIAGNOSIS

SEAT BELT WARNING LAMP

System Diagram

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System Description

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Seat belt warning lamp will light up if the driver has started the engine or turned ignition switch to ON position.

DRIVER SIDE SEAT BELT WARNING LAMP OPEARATION

• Driver side seat belt warning lamp is built in combination meter.
• Warning lamp lights up if seat belt buckle switch is in OFF position (unbuckled).
• Warning lamp turns off if seat belt buckle switch is in ON position (buckled).

PASSENGER SIDE SEAT BELT WARNING LAMP OPERATION

• Passenger side seat belt warning lamp is located on center consol indicator unit.
• There is an occupant detection unit situated inside passenger seat. Note that passenger seat belt warning

lamp will not light up if the seat is unoccupied.

• If passenger seat is occupied and seat belt buckle is in OFF position warning lamp will light up.
• If passenger seat is occupied and seat belt buckle is in ON position warning lamp will turn off.

REAR SEAT BELT WARNING LAMP OPEATION

• Rear seat belt warning lamps are located on center consol indicator unit.
• Warning lamp lights up if seat belt buckle switch is in OFF position (unbuckled)
• Warning lamp turns off if seat belt buckle switch is in ON position (buckled).
• Regardless of rear seat belt status, warning lamp turns off approximately 35 seconds (the specified time)

after the engine has started.

JMHIA0232GB

SEAT BELT WARNING LAMP

SBC-5

< FUNCTION DIAGNOSIS >

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Component Parts Location

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Component Description

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JMHIA0231ZZ

1.

Seat belt warning lamp (built in com-
bination meter M34)

2.

Indicator unit M91

3.

Seat belt buckle switch (Driver side) 
B22

4.

Occupant detection unit B48

A.

Behind seat cushion trim

Item

Function

Combination meter

• Driver seat belt warning lamp is built in combination meter.
• Detects the status of driver side passenger side seat belt buckle switch and controls warning 

lamp operation.

Indicator unit

• Passenger side and rear seat belt warning lamps are built in indicator unit.
• Detects the status of rear seat belt buckle switch and controls the warning lamp illumination.
• Judges the status of engine by detection of the signal transmitted by alternator and performs 

the control of seat belt warning lamp ON/OFF function.

Seat belt buckle switch
(driver/passenger/rear)

Detects seat belt feature status transmits signal to combination meter or to indicator unit.

SBC-6

< COMPONENT DIAGNOSIS >

INDICATOR UNIT POWER SUPPLY CIRCUIT

COMPONENT DIAGNOSIS

INDICATOR UNIT POWER SUPPLY CIRCUIT

Component Function Check

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1.

CHECK INDICATOR UNIT FUNCTION

1.

All seat belt buckle are unbuckle.

2.

Turn ignition switch ON.

3.

Check indicator unit operation.

Is the inspection results normal?

YES

>> Indicator unit power supply circuit is OK.

NO

>> Refer to 

SBC-6, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect indicator unit connector.

3.

Check voltage between indicator unit connector and ground.

Is the inspection result normal?

YES

>> Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Repair or replace power supply circuit.

Terminals

Voltage(V)

(Approx.)

(+)

(-)

 Indicator unit connector

Terminal

M91

7

Ground

Battery voltage

FRONT SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

SBC-7

< COMPONENT DIAGNOSIS >

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FRONT SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

Description

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• Detects if the seat belt is fastened or unfastened.
• Warning lamp turns OFF if the seat belt is fastened.

Component Function Check

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1.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) FUNCTION

Check “SEAT BELT W/L” in DATA MONITOR mode with CONSULT-III

Is the inspection results normal?

YES

>> Seat belt buckle switch (driver side) function is OK.

NO

>> Refer to 

SBC-7, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) FUNCTION

1.

Turn ignition switch ON.

2.

Check voltage between combination meter connector and ground.

Is the inspection result normal?

YES

>> Refer to 

GI-39, "Intermittent Incident"

NO

>> GO TO 2.

2.

CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) HARNESS

1.

Turn ignition switch OFF.

2.

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

3.

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

4.

Check continuity between combination meter harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK GROUND CIRCUIT

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

Is the inspection result normal?

YES

>> GO TO 4.

Driver seat belt is unfastened

SEAT BELT W/L  :   ON

Driver seat belt is fastened

SEAT BELT W/L  :   OFF

Combination meter connector 

 Terminal

Condition

Voltage (V)

(Approx.)

M34

(+)

(-)

35

Ground

Driver seat belt is unfastened

0

Driver seat belt is fastened

5

Combination meter connector

Terminal

Seat belt buckle switch (driver side) connector

terminal

Continuity

M34

35

B22

1

Existed

Combination meter connector

Terminal

Ground

Continuity

M34

35

Not existed

Seat belt buckle switch (driver side) connector

Terminal

Ground

Continuity

B22

2

Existed