Infiniti FX35, FX50 (S51). Manual — part 1591
SBC-22
< DTC/CIRCUIT DIAGNOSIS >
B2455 CONTROL UNIT DR
B2455 CONTROL UNIT DR
Description
INFOID:0000000005241723
• It controls pre-crash seat belt motor according to input signal
• Built in driver side seat belt retractor
DTC Logic
INFOID:0000000005241724
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1.
Turn ignition switch ON.
2.
Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Refer to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005241725
1.
.INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2455 displayed again?
YES
>> Replace pre-crash seat belt control unit (driver side).
NO
>> GO TO 2.
2.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2455
CONTROL UNIT DR
Pre-crash seat belt control unit internal circuit malfunction
Control unit internal malfunction
B2456 SEAT BLT PWR AS
SBC-23
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
B2456 SEAT BLT PWR AS
Description
INFOID:0000000005241726
• When control unit activates pre-crash seat belt system, it retracts the shoulder belt with the electric motor
and reduces the seat belt slack.
• Power supply is supplied constantly from battery power supply.
DTC Logic
INFOID:0000000005241727
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1.
Turn ignition switch ON.
2.
Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005241728
1.
CHECK FUSE AND FUSIBLE LINK
Check that the following fuse and fusible link are not blown.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is
blown.
2.
CHECK PRE-CRASH SEAT BELT MOTOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit (passenger side) connector.
3.
Check voltage between pre-crash seat belt control unit (passenger side) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness between pre-crash seat belt control unit (passenger side) and fusible
link.
3.
CHECK SELF DIAGNOSTIC RESULT
1.
Connect pre-crash seat belt control unit (passenger side) connector.
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2456
SEAT BLT PWR AS
Pre-crash seat belt control unit power supply cir-
cuit is open or shorted
CAUTION:
Malfunction is judged when 30A (F/L-K) fusible
link blows out even if motor power supply cir-
cuit is not malfunctioning.
• Open circuit and short circuit to
ground in drive circuit power supply
harness
• Control unit internal malfunction
Terminal No.
Signal name
Fuse and fusible link No.
19
Battery power supply
K
Pre-crash seat belt control unit (passenger side)
Ground
Voltage (V)
(Approx.)
Connector
Terminal
Battery voltage
B221
19
SBC-24
< DTC/CIRCUIT DIAGNOSIS >
B2456 SEAT BLT PWR AS
2.
Turn ignition switch ON.
3.
Check “Self-diagnostic result” with CONSULT-III.
4.
Touch “ERASE”.
5.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2456 displayed again?
YES
>> Replace pre-crash seat belt control unit (passenger side).
NO
>> GO TO 4.
4.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
B2457 CONTROL UNIT AS
SBC-25
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
B2457 CONTROL UNIT AS
Description
INFOID:0000000005241729
• It controls pre-crash seat belt motor according to input signal
• Built in passenger side seat belt retractor
DTC Logic
INFOID:0000000005241730
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1.
Turn ignition switch ON.
2.
Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005241731
1.
.INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2457 displayed again?
YES
>> Replace pre-crash seat belt control unit (passenger side).
NO
>> GO TO 2.
2.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2457
CONTROL UNIT AS
Pre-crash seat belt control unit internal circuit malfunction
Control unit internal malfunction
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