Infiniti FX35, FX50 (S51). Manual — part 1589
SBC-14
< DTC/CIRCUIT DIAGNOSIS >
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000005241708
• CAN (Controller Area Network) is a serial communication line for real time applications. It is an on board
multiplex communication line with high data communication speed and excellent error detection ability. A
modern vehicle is equipped with many ECMs, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, two control units are connected
with two communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with
less wiring. Each control unit transmits/receives data but selectively reads required data only.
• It transmits the vehicle status to pre-crash seat belt control unit using the CAN communication system.
• It consists of CAN system (unified meter and A/C amp., ICC sensor, BCM, steering angle sensor).
• Refer to
LAN-29, "CAN System Specification Chart"
in LAN section for CAN communication unit (2WD).
DTC Logic
INFOID:0000000005241709
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1.
Turn ignition switch ON and wait for 2 seconds or more.
2.
Check “Self-diagnostic result” with CONSULT-III.
Is any DTC detected?
YES
>> Refer to
LAN-29, "CAN System Specification Chart"
in LAN section for CAN communication or
CAN system.
NO
>> CAN communication system is normal.
DTC No.
Self-diagnosis
item
DTC Detection Condition
Possible causes
U1000
CAN communi-
cation circuit
Pre-crash seat belt control unit cannot transmit and receive
CAN communication system for 2 seconds or more.
CAN message reception
malfunction
B2451 SEAT BLT MTR DR CIRC
SBC-15
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
I
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K
L
M
A
B
SBC
N
O
P
B2451 SEAT BLT MTR DR CIRC
Description
INFOID:0000000005241710
• It pulls, returns, and maintains according to the motor rotation.
• It is built into the seat belt retractor.
• It is installed to back of driver side center pillar garnish.
DTC Logic
INFOID:0000000005241711
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:0000000005241712
1.
INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2451 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
B2451
SEAT BLT MTR DR
CIRC
Circuit of seat belt motor (driver side) is
open or shorted
Control unit internal malfunction
SBC-16
< DTC/CIRCUIT DIAGNOSIS >
B2452 SEAT BLT MTR AS CIRC
B2452 SEAT BLT MTR AS CIRC
Description
INFOID:0000000005241713
• It pulls, returns, and maintains according to the motor rotation.
• It is built into the seat belt retractor.
• It is installed to the back of passenger side center pillar garnish.
DTC Logic
INFOID:0000000005241714
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:0000000005241715
1.
INSPECTION START
1.
Check “Self-diagnostic result” with CONSULT-III.
2.
Touch “ERASE”.
3.
Perform DTC Confirmation Procedure.
See
.
Is DTC B2452 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
B2452
SEAT BLT MTR AS CIRC
Circuit of seat belt motor (pas-
senger side) is open or shorted
Control unit internal malfunction
B2453 BR STROKE SEN CIRC
SBC-17
< DTC/CIRCUIT DIAGNOSIS >
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B2453 BR STROKE SEN CIRC
Description
INFOID:0000000005241716
• It changes voltage according to brake pedal depressed amount and sends the signal to pre-crash seat belt
control unit.
• There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake pedal stroke sensor. Pre-crash
seat belt control unit judges the stroke amount and the speed of the brake pedal according to the voltage of
the signal sent by each side.
• It is installed to back of driver instrument panel (lower).
DTC Logic
INFOID:0000000005241717
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:0000000005241718
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 5.
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect brake pedal stroke sensor connector.
3.
Check voltage between Brake pedal stroke sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2453
BR STROKE SEN
CIRC
Circuit of brake pedal stroke sensor
output is open or shorted
• Open circuit, short circuit to battery, and short
circuit to ground in brake pedal stroke sensor
harness
• Control unit internal malfunction
• Brake pedal stroke sensor malfunction
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
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