Infiniti QX56 (Z62). Manual - part 1088

SBC-52

< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000006237930

1.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.

3.

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness con-
nector and ground.

Is the measurement value normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness or connector.

2.

CHECK POWER SUPPLY CIRCUIT-I

Check voltage between pre-crash seat belt control unit (driver side and passenger side) harness connector
and ground.

Is the measurement value normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

CHECKPOWER SUPPLY CIRCUIT-II

1.

Disconnect fuse block (J/B) harness connector.

2.

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness con-
nector and fuse block (J/B) harness connector.

3.

Check continuity between pre-crash seat belt control unit (driver side and passenger side) harness con-
nector and ground.

Is the measurement value normal?

YES

>> Check 10 A fuse (No. 6).

NO

>> Repair or replace harness or connector.

Pre-crash seat belt control unit

Ground

Continuity

Connector

Terminal

B9 (Driver side)

18

Existed

20

B231 (Passenger side)

18

20

Pre-crash seat belt control unit

Ground

Voltage

(Approx.)

Connector

Terminal

B9 (Driver side)

1

Battery voltage

B231 (Passenger side)

Pre-crash seat belt control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B9 (Driver side)

1

M2

6B

Existed

B231 (Passenger side)

Pre-crash seat belt control unit

Ground

Continuity

Connector

Terminal

B9 (Driver side)

1

Not existed

B231 (Passenger side)

SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

SBC-53

< DTC/CIRCUIT DIAGNOSIS >

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SBC

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SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

Component Function Check

INFOID:0000000006237931

1.

CHECK SEAT BELT WARNING LAMP FUNCTION

1.

Turn ignition switch ON.

2.

Sits in the passenger seat.

3.

Fasten the seat belt (passenger side).

4.

Check seat belt warning lamp function.

Is the inspection results normal?

YES

>> GO TO 2.

NO

>> Check seat belt warning lamp circuit. Refer to 

SBC-57, "Diagnosis Procedure"

.

2.

CHECK PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE) FUNCTION

 With CONSULT-III

When checking “BUCKLE SW LH” on DATA MONITOR screen, check that ON/OFF display changes synchro-
nized 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

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

SBC-53, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006237932

1.

CHECK PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE) OUTPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect seat belt assembly (driver side) harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between seat belt assembly (driver side) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK SEAT BELT ASSEMBLY (DRIVER SIDE) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit (driver side) harness connector.

3.

Check continuity between pre-crash seat belt control unit (driver side) harness connector and seat belt
assembly (driver side) harness connector.

Condition

Seat belt warning lamp

Seat belt (driver side) is fastened

Not illuminated

Seat belt (driver side) is unfastened

Illuminated

Monitor item

Condition

BUCKLE SW LH

When driver side seat belt is not fastened: OFF

When driver side seat belt is fastened: ON

(+)

(–)

Voltage (V)

(Approx.)

Seat belt assembly (driver side)

Connector

Terminal

B76

5

Ground

5

Pre-crash seat belt control unit (driver side)

Seat belt assembly (driver side)

Continuity

Connector

Terminal

Connector

Terminal

B9

6

B76

5

Existed

SBC-54

< DTC/CIRCUIT DIAGNOSIS >

SEAT BELT BUCKLE SWITCH (DRIVER SIDE)

4.

Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.

Is the inspection result normal?

YES

>> Replace pre-crash seat belt control unit (driver side). Refer to 

SB-6, "SEAT BELT RETRACTOR :

Removal and Installation"

.

NO

>> Repair or replace harness or connector.

3.

CHECK SEAT ASSEMBLY SWITCH GROUND CIRCUIT

Check continuity between seat belt assembly (driver side) and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness or connector.

4.

CHECK SEAT BELT ASSEMBLY (DRIVER SIDE) 

Check seat belt assembly (driver side). Refer to 

SBC-54, "Component Inspection [Seat Belt Assembly (Driver

Side)]"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

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

SB-6, "SEAT BELT RETRACTOR : Removal

and Installation"

.

Component Inspection [Seat Belt Assembly (Driver Side)]

INFOID:0000000006237933

1.

CHECK SEAT BELT ASSEMBLY (DRIVER SIDE)

1.

Turn ignition switch OFF.

2.

Disconnect seat belt assembly (driver side) harness connector.

3.

Check continuity between seat belt assembly (driver side) terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

SB-6, "SEAT BELT RETRACTOR : Removal

and Installation"

.

Pre-crash seat belt control unit (driver side)

Ground

Continuity

Connector

Terminal

B9

6

Not existed

Seat belt assembly (driver side)

Ground

Continuity

Connector

Terminal

B76

4

Existed

Seat belt assembly (driver side)

Condition

Continuity

Terminal

3

4

When driver side seat belt is fastened

Not existed

When driver side seat belt is not fastened

Existed

5

When driver side seat belt is fastened

Existed

When driver side seat belt is not fastened

Not existed

SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)

SBC-55

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

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M

A

B

SBC

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SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)

Component Function Check

INFOID:0000000006237934

1.

CHECK SEAT BELT WARNING LAMP FUNCTION

1.

Turn ignition switch ON.

2.

Sits in the passenger seat.

3.

Fasten the seat belt (passenger side).

4.

Check seat belt warning lamp function.

Is the inspection results normal?

YES

>> GO TO 2.

NO

>> Check seat belt warning lamp circuit. Refer to 

SBC-57, "Diagnosis Procedure"

.

2.

CHECK PRE-CRASH SEAT BELT CONTROL UNIT FUNCTION

 With CONSULT-III

When checking “BUCKLE SW RH” on DATA MONITOR screen, check that ON/OFF display changes are syn-
chronized with the insertion operation to the seat belt buckle.

Is the inspection result normal?

YES

>> Seat belt buckle switch (passenger side) circuit is normal.

NO

>> Check seat belt buckle switch (passenger side). Refer to 

SBC-55, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006237935

1.

CHECK PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE) OUTPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect seat belt assembly (passenger side) harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between seat belt assembly (passenger side) and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit (passenger side) harness connector.

3.

Check continuity between pre-crash seat belt control unit (passenger side) harness connector and seat
belt assembly (passenger side) harness connector.

Condition

Seat belt warning lamp

Seat belt (driver side) is fastened

Not illuminated

Seat belt (driver side) is unfastened

Illuminated

Monitor item

Condition

BUCKLE SW RH

When driver side seat belt is not fastened: OFF

When driver side seat belt is fastened: ON

(+)

(–)

Voltage (V)

(Approx.)

Seat belt assembly (passenger side)

Connector

Terminal

B245

5

Ground

5

Pre-crash seat belt control unit (passenger side)

Seat belt assembly (passenger side)

Continuity

Connector

Terminal

Connector

Terminal

B231

6

B245

5

Existed