Infiniti QX56 (Z62). Manual — part 1084
SBC-36
< DTC/CIRCUIT DIAGNOSIS >
B2451 SEAT BLT MTR DR CIRC
B2451 SEAT BLT MTR DR CIRC
DTC Logic
INFOID:0000000006237899
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
>> Driver side pre-crash seat belt motor system is normal.
Diagnosis Procedure
INFOID:0000000006237900
1.
INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure. Refer to
Is DTC B2451 displayed again?
YES
>> Replace pre-crash seat belt control unit (driver side). Refer to
NO
>> GO TO 2.
2.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2451
SEAT BLT MTR DR CIRC
Circuit of seat belt motor (driver side) is
open or shorted
Pre-crash seat belt control unit (driver side)
B2452 SEAT BLT MTR AS CIRC
SBC-37
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
B2452 SEAT BLT MTR AS CIRC
DTC Logic
INFOID:0000000006237901
DTC DETECTION LOGIC
DTC REPRODUCTION 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
>> Passenger side pre-crash seat belt motor system is normal.
Diagnosis Procedure
INFOID:0000000006237902
1.
INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure. Refer to
.
Is DTC B2452 displayed again?
YES
>> Replace pre-crash seat belt control unit (passenger side). Refer to
TOR : Removal and Installation"
.
NO
>> GO TO 2.
2.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2452
SEAT BLT MTR AS CIRC
Circuit of seat belt motor (passenger side)
is open or shorted
Pre-crash seat belt control unit (passenger
side)
SBC-38
< DTC/CIRCUIT DIAGNOSIS >
B2453 BR STROKE SEN CIRC
B2453 BR STROKE SEN CIRC
DTC Logic
INFOID:0000000006237903
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:0000000006237904
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
1.
Turn ignition switch ON.
2.
Select “BRK PEDAL SNSR1” and “BRK PEDAL SNSR2” in “DATA MONITOR” mode with CONSULT-III.
3.
Check “BRK PEDAL SNSR1” and “BRK PEDAL SNSR2” indication under the following conditions.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect brake pedal stroke sensor harness connector.
3.
Check voltage between brake pedal stroke sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect pre-crash seat belt control unit (driver side) harness connector.
2.
Check continuity between pre-crash seat belt control unit (driver side) harness connector and brake pedal
stroke sensor harness connector.
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2453
BR STROKE SEN CIRC
Circuit of brake pedal stroke sensor out-
put is open or shorted
• Harness or connectors
(The sensor circuit is open or shorted)
• Pre-crash seat belt control unit (driver side)
• Brake pedal stroke sensor
Monitor item
Condition
Voltage (V)
(Approx.)
BRK PEDAL SNSR1
Brake released
→
depressed
1
→
4
BRK PEDAL SNSR2
4
→
1
Brake pedal stroke sensor
Ground
Voltage (V)
(Approx.)
Connector
Terminal
E111
2
5
Pre-crash seat belt control unit (driver side)
Brake pedal stroke sensor
Continuity
Connector
Terminal
Connector
Terminal
B9
10
E111
2
Existed
B2453 BR STROKE SEN CIRC
SBC-39
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
3.
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.
4.
CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT
1.
Disconnect pre-crash seat belt control unit (driver side) harness 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 harness connector (driver side) and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness or connector.
5.
CHECK BRAKE PEDAL STROKE SENSOR
SBC-39, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace brake pedal stroke sensor. Refer to
SBC-63, "Removal and Installation"
.
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000006237905
COMPONENT PARTS INSPECTION
1.
CHECK BRAKE PEDAL STROKE SENSOR
1.
Turn ignition switch OFF.
2.
Disconnect brake pedal stroke sensor connector.
3.
Check resistance between brake pedal stroke sensor terminal as per the following.
Pre-crash seat belt control unit (driver side)
Ground
Continuity
Connector
Terminal
B9
10
Not existed
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
12
17
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