Infiniti G37 Coupe. Manual — part 1077
SBC-16
< COMPONENT DIAGNOSIS >
B2452 SB MOTOR LH CIRC
B2452 SB MOTOR LH CIRC
Description
INFOID:0000000001711980
• 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 LH center pillar garnish.
DTC Logic
INFOID:0000000001711981
DTC DETECTION LOGIC
DTC REPRODUCTION PROCEDURE
1.
CHECK LH PRE-CRASH SEAT BELT MOTOR CIRCUIT
Check “SELF-DIAG RESULT” of CONSULT-lll.
Is any DTC detected?
YES
>> Refer to
.
NO
>> LH pre-crash seat belt motor system is normal.
Diagnosis Procedure
INFOID:0000000001711982
1.
CHECK LH PRE-CRASH SEAT BELT MOTOR HARNESS
1.
Turn the ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit and LH pre-crash seat belt motor connector.
3.
Does continuity between pre-crash seat belt control unit harness connector terminals 4, 6 and LH pre-
crash seat belt motor harness connector terminals 1, 2 exist?
4.
Does continuity between pre-crash seat belt control unit harness connector terminals 4, 6 and ground
exist?
Is the inspection result normal?
YES
>> Refer to
SBC-16, "Component Inspection"
.
NO
>> Repair or replace harness between pre-crash seat belt control unit and LH pre-crash seat belt
motor.
Component Inspection
INFOID:0000000001711983
COMPONENT PARTS INSPECTION
1.
CHECK LH PRE-CRASH SEAT BELT MOTOR
Does continuity between LH seat belt terminals 1 and 2 exist?
Is the inspection result normal?
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2452
Seat belt motor system LH
Circuit of seat belt motor (LH) is
open or shorted
• Open circuit, short circuit to bat-
tery, and short circuit to ground in
seat belt motor (LH) harness
• ECU internal malfunction
1 - 6
Existed
2 - 4
Existed
4 - Ground
Not existed
6 - Ground
Not existed
1 - 2
Existed
B2452 SB MOTOR LH CIRC
SBC-17
< COMPONENT DIAGNOSIS >
C
D
E
F
G
I
J
K
L
M
A
B
SBC
N
O
P
YES
>> Replace pre-crash seat belt control unit.
NO
>> Replace LH pre-crash seat belt motor.
SBC-18
< COMPONENT DIAGNOSIS >
B2453 BR STROK SEN CIRC
B2453 BR STROK SEN CIRC
Description
INFOID:0000000001711984
• 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 will judge 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:0000000001711985
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CHECK LH PRE-CRASH SEAT BELT MOTOR CIRCUIT
Check “SELF-DIAG RESULT” of CONSULT-lll.
Is any DTC detected?
YES
>> Refer to Check 2 of
.
NO
>> Refer to Check 1 of
.
Diagnosis Procedure
INFOID:0000000001711986
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
Select “B-pedal sensor SIG1” and “B-pedal sensor SIG2”, and then check that the voltage changes are syn-
chronized with brake pedal operation.
Is the inspection result normal?
YES
>> Brake pedal stroke sensor system is normal.
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL STROKE SENSOR HARNESS
1.
Turn the ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit and brake pedal stroke sensor connector.
3.
Does continuity between pre-crash seat belt control unit harness connector terminals 16, 18, 20, 21 and
brake pedal stroke sensor harness connector terminals 1, 2, 3, 4 exist?
4.
Does continuity between pre-crash seat belt control unit harness connector terminals 16, 18, 20, 21 and
ground exist?
DTC No.
Self-diagnosis item
DTC Detection Condition
Possible causes
B2453
B-pedal sensor sys-
tem
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
• ECU internal malfunction
B-pedal sensor SIG1
Brake released
→
depressed
Approx. 1
→
4V
B-pedal sensor SIG2
Brake released
→
depressed
Approx. 4
→
1V
16 - 1
Existed
18 - 2
Existed
20 - 3
Existed
21 - 4
Existed
B2453 BR STROK SEN CIRC
SBC-19
< COMPONENT 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 and brake pedal stroke sensor.
3.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1.
Connect pre-crash seat belt control unit connector.
2.
Turn the ignition switch ON.
3.
Check that voltage between pre-crash seat belt control unit harness connector terminal 18 and ground is
normal.
Is the inspection result normal?
YES
>> Refer to
SBC-19, "Component Inspection"
.
NO
>> Replace pre-crash seat belt control unit.
Component Inspection
INFOID:0000000001711987
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.
Is the inspection result normal?
YES
>> Brake pedal stroke sensor system is normal.
NO
>> Replace brake pedal stroke sensor.
16 - Ground
Not existed
18 - Ground
Not existed
20 - Ground
Not existed
21 - Ground
Not existed
18 - Ground
Approx. 5V
Terminal
Measuring condition
Resistance (K
Ω
)
2
1
Brake released
→
depressed
Approx. 1.0
→
0.2
3
Brake released
→
depressed
Approx. 0.2
→
1.0
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