Infiniti FX35, FX50 (S51). Manual — part 1590
SBC-18
< DTC/CIRCUIT DIAGNOSIS >
B2453 BR STROKE SEN CIRC
3.
CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT
1.
Disconnect pre-crash seat belt control unit connector.
2.
Check continuity between pre-crash seat belt control unit harness connector and brake pedal stroke sen-
sor harness connector.
3.
Check continuity between pre-crash seat belt control unit harness connector and ground.
Is the inspection result normal?
YES
>> Refer to
SBC-18, "Component Inspection"
.
NO
>> Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.
4.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect pre-crash seat belt control unit (driver side) connector.
2.
Check continuity between pre-crash seat belt control unit (driver side) harness connector and brake pedal
stroke sensor harness connector.
3.
Check continuity between pre-crash seat belt control unit (driver side) and ground.
Is the inspection result normal?
YES
>> Replace pre-crash seat belt control unit (driver side).
NO
>> Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.
5.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005241719
COMPONENT PARTS INSPECTION
1.
CHECK BRAKE PEDAL STROKE SENSOR
Check that continuity between brake pedal stroke sensor terminal 2 and terminals 1 and 3 is normal when per-
forming the brake operation.
Pre-crash seat belt control unit (driver side)
Brake pedal stroke sensor
Continuity
Connector
Terminal
Connector
Terminal
B9
2
E111
1
Existed
12
3
17
4
Pre-crash seat belt control unit (driver side)
Ground
Continuity
Connector
Terminal
B9
2
Not existed
10
12
17
Pre-crash seat belt control unit (driver side)
Brake pedal stroke sensor
Continuity
Connector
Terminal
Connector
Terminal
B9
10
E111
2
Existed
Pre-crash seat belt control unit (driver side)
Ground
Continuity
Connector
Terminal
B9
10
Not existed
B2453 BR STROKE SEN CIRC
SBC-19
< 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
>> Brake pedal stroke sensor system is normal.
NO
>> Replace brake pedal stroke sensor.
Brake pedal stroke sensor
Condition
Resistance (K
Ω
)
(Approx.)
Terminal
2
1
Brake released
→
depressed
1.0
→
0.2
3
0.2
→
1.0
SBC-20
< DTC/CIRCUIT DIAGNOSIS >
B2454 SEAT BLT PWR DR CIRC
B2454 SEAT BLT PWR DR CIRC
Description
INFOID:0000000005241720
• When control unit activates pre-crush seat belt system, it retracts the shoulder belt with the electric motor
and reduces seat belt slack.
• Power supply is supplied constantly from battery power supply.
DTC Logic
INFOID:0000000005241721
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:0000000005241722
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 (driver side) connector.
3.
Check voltage between pre-crash seat belt control unit (driver 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 and fusible link.
3.
CHECK SELF DIAGNOSTIC RESULT
1.
Connect pre-crash seat belt control unit (driver side) connector.
2.
Turn ignition switch ON.
3.
Check “Self-diagnostic result” with CONSULT-III.
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2454
SEAT BLT PWR DR
CIRC
Motor power supply circuit is open or shorted
CAUTION:
Malfunction is judged when 30A (F/L-J) 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
J
Pre-crash seat belt control unit (driver side)
Ground
Voltage (V)
(Approx.)
Connector
Terminal
Battery voltage
B9
19
B2454 SEAT BLT PWR DR CIRC
SBC-21
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
4.
Touch “ERASE”.
5.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2454 displayed again?
YES
>> Replace pre-crash seat belt control unit (driver side).
NO
>> GO TO 4.
4.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
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