Infiniti FX35, FX50 (S51). Manual — part 1595
SBC-38
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
With CONSULT-III
When checking “BUCKLE SW” on DATA MONITOR of METER/M&A, check that ON/OFF display changes
synchronized 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-38, "SEAT BELT WARNING LAMP SYSTEM : Diagnosis Procedure"
.
SEAT BELT WARNING LAMP SYSTEM : Diagnosis Procedure
INFOID:0000000005241763
1.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
1.
Turn the ignition switch ON.
2.
Check that voltage between seat belt buckle switch (driver side) harness connector and ground.
*
1
: With climate controlled seat
*
2
: Without climate controlled seat
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 and seat belt buckle switch (driver side) connector.
3.
Check continuity between combination meter harness connector and seat belt buckle switch (driver side)
harness connector.
*
1
: With climate controlled seat
*
2
: Without climate controlled seat
4.
Check continuity between combination meter harness connector and ground.
Is the inspection result normal?
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
B13*
1
1*
1
Ground
When driver side seat
belt is fastened
8.5
When driver side seat
belt is not fastened
0
B503*
2
61
*2
When driver side seat
belt is fastened
8.5
When driver side seat
belt is not fastened
0
Combination meter
Seat belt buckle switch (driver side)
Continuity
Connector
Terminal
Connector
Terminal
M53
29
B13*
1
1
*1
Existed
B503*
2
61*
2
Combination meter
Ground
Continuity
Connector
Terminal
M53
29
Not existed
SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
SBC-39
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
YES
>> Repair or replace combination meter.
NO
>> Repair or replace harness between combination meter and seat belt buckle switch (driver side).
3.
CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
Check continuity between seat belt buckle switch (driver side) harness connector and ground.
*
1
: With climate controlled seat
*
2
: Without climate controlled seat
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness between seat belt buckle switch and ground.
4.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Check seat belt buckle switch (driver side). Refer to
SBC-39, "SEAT BELT WARNING LAMP SYSTEM : Com-
ponent Inspection (Belt Buckle Switch)"
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (driver side).
SEAT BELT WARNING LAMP SYSTEM : Component Inspection (Belt Buckle Switch)
INFOID:0000000005241764
1.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
1.
Turn ignition switch OFF
2.
Disconnect seat belt buckle switch connector.
3.
Check continuity of seat belt buckle (driver side).
*
1
: With climate controlled seat
*
2
: Without climate controlled seat
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (driver side).
Seat belt buckle switch (driver side)
Ground
Continuity
Connector
Terminal
B13*
1
2*
1
Existed
B503
*2
60
*2
Seat belt buckle switch (driver side)
Condition
Continuity
Connector
Terminal
B13
*1
1
2
When driver side seat
belt is not fastened
Existed
When driver side seat
belt is fastened
Not existed
B503*
2
61
60
When driver side seat
belt is not fastened
Existed
When driver side seat
belt is fastened
Not existed
SBC-40
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
PRE-CRASH SEAT BELT SYSTEM
PRE-CRASH SEAT BELT SYSTEM : Description
INFOID:0000000005241765
• Performs the control of tension reducer according to the seat belt buckle switch ON/OFF.
• Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt switch is
not fastened, illuminates the seat belt warning lamp on the combination meter.
• The seat belt buckle switch is installed in the seat belt buckle.
PRE-CRASH SEAT BELT SYSTEM : Component Function Check
INFOID:0000000005241766
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
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
>> Refer to
SBC-40, "PRE-CRASH SEAT BELT SYSTEM : Diagnosis Procedure"
.
PRE-CRASH SEAT BELT SYSTEM : Diagnosis Procedure
INFOID:0000000005241767
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
Check that voltage between seat belt buckle switch (passenger side) and ground.
Is the inspection result normal?
YES
>> Seat belt buckle switch (passenger side) circuit is normal.
NO
>> GO TO 2.
2.
CHECK SEAT BELT BUCKLE (PASSENGER SIDE) SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit (passenger side) connector and seat belt buckle switch (pas-
senger side) connector.
3.
Check continuity between pre-crash seat belt control unit (passenger side) and seat belt buckle switch
(passenger side).
4.
Check continuity between pre-crash seat belt control unit (passenger side) and ground.
Monitor item
Condition
BUCKLE SW RH
When driver side seat belt is not fastened: OFF
When driver side seat belt is fastened: ON
(+)
(–)
Condition
Voltage (V)
(Approx.)
Seat belt buckle switch (passenger side)
Connector
Terminal
B513
59
Ground
When driver side seat
belt is not fastened
5
When driver side seat
belt is fastened
0
Pre-crash seat belt control unit (passenger side)
Seat belt buckle switch (passenger side)
Continuity
Connector
Terminal
Connector
Terminal
B221
6
B513
59
Existed
SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
SBC-41
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness between pre-crash seat belt control unit (passenger side) and seat belt
buckle switch (passenger side).
3.
CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
Check continuity between seat belt buckle switch (passenger side) and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness between seat belt buckle switch and ground.
4.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
Check seat belt buckle switch (passenger side). Refer to
SBC-41, "PRE-CRASH SEAT BELT SYSTEM : Com-
ponent Inspection (Belt Buckle Switch)"
Is the inspection result normal?
YES
>> Replace pre-crash seat belt control unit (passenger side).
NO
>> Replace seat belt buckle switch (passenger side).
PRE-CRASH SEAT BELT SYSTEM : Component Inspection (Belt Buckle Switch)
INFOID:0000000005241768
1.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE)
1.
Turn ignition switch OFF.
2.
Disconnect seat belt buckle switch connector.
3.
Check continuity of seat belt buckle (passenger side).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace seat belt buckle switch (passenger side).
SEAT BELT WARNING LAMP SYSTEM
SEAT BELT WARNING LAMP SYSTEM : Description
INFOID:0000000005241769
• Performs the control of tension reducer according to the seat belt buckle switch ON/OFF.
• Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt switch is
not fastened, illuminates the seat belt warning lamp on the combination meter.
• The seat belt buckle switch is installed in the seat belt buckle.
SEAT BELT WARNING LAMP SYSTEM : Component Function Check
INFOID:0000000005241770
1.
CHECK SEAT BELT WARNING FUNCTION
Pre-crash seat belt control unit (passenger side)
Ground
Continuity
Connector
Terminal
B221
6
Not existed
Seat belt buckle switch (passenger side)
Ground
Continuity
Connector
Terminal
B513
60
Existed
Seat belt buckle switch (passenger side)
Condition
Continuity
Terminal
59
60
When driver side seat belt is
not fastened
Not existed
When driver side seat belt is
fastened
Existed
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