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 >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
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
.
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
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
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
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
.
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
.
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
I
J
K
L
M
A
B
SBC
N
O
P
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
.
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
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
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