Infiniti M35/M45 Y50. Manual — part 1036
PRE-CRASH SEAT BELT
SB-15
C
D
E
F
G
I
J
K
L
M
A
B
SB
Preliminary Check
NHS00086
PRE-CRASH SEAT BELT OPERATION INSPECTION
WARNING:
●
The following tests should be performed in a safe, open place that is free of traffic and obstacles.
●
The tests should be performed on a dry, paved road. Do not attempt the tests on wet or unpaved
road, open road, or highway. (This may cause an accident or personal injury.)
●
Driver and passenger assume it will not operate and prepare themselves accordingly.
1.
Tighten driver and passenger seat belts.
2.
Drive at approximately 25 km/h (16 MPH).
3.
Notify passenger of a sudden stop. Driver and passenger prepare themselves for the possibility of
system not operating. Then, driver fully depresses the brake pedal to stop suddenly.
4.
Make sure that the shoulder of the seat belt is pulled while braking.
Diagnoses Symptom Chart
NHS00087
Check CAN Communication Circuit [U1000]
NHS00088
1.
CHECK SELF-DIAGNOSTIC RESULT
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
With CONSULT-II
1.
Connect CONSULT-II, and turn ignition switch ON.
2.
Touch “PRECRASH SEATBELT” on “SELECT SYSTEM”
screen.
3.
Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE”
screen.
4.
Check display content in self-diagnostic results.
Displayed U1000?
Yes
LAN-50, "CAN System Specification Chart"
.
No
>> Inspection END.
Symptom
Diagnosis procedure
Reference
page
All functions of pre-crash seat belt system
does not operate.
1. Check ignition power supply circuit
2. Check motor power supply and ground circuit [B2454]
3. Check CAN communication circuit
4. Replace pre-crash seat belt control unit
Driver side pre-crash seat belt system does
not operate.
1. Check seat belt buckle switch (driver side) circuit
2. Check pre-crash seat belt motor LH circuit [B2452]
3. Replace pre-crash seat belt control unit
Passenger side pre-crash seat belt system
does not operate.
1. Check seat belt buckle switch (passenger side) circuit
2. Check pre-crash seat belt motor RH circuit [B2451]
3. Replace pre-crash seat belt control unit
Pre-crash seat belt system does not operate
during emergency brake operation.
1. Check CAN communication circuit [U1000]
2. Check brake pedal stroke sensor circuit [B2453]
3. Check brake pedal stroke sensor shield wire circuit
4. Replace pre-crash seat belt control unit
PHIA0772E
SB-16
PRE-CRASH SEAT BELT
Check Ignition Power Supply Circuit
NHS00089
1.
CHECK FUSE
Check 10A fuse [No.15, located in fuse block (J/B)].
NOTE:
Refer to
SB-3, "Component Parts and Harness Connector Location"
.
OK or NG
OK
>> GO TO 2.
NG
>> If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse. Refer to
PG-3, "POWER SUPPLY ROUTING CIRCUIT"
2.
CHECK IGNITION POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit connector.
3.
Turn ignition switch ON.
4.
Check voltage between pre-crash seat belt control unit harness
connector and ground.
OK or NG
OK
>> Ignition power supply circuit is OK.
NG
>> Check pre-crash seat belt control unit ignition power supply circuit harness.
Check Motor Power Supply and Ground Circuit [B2454]
NHS0008A
1.
CHECK FUSE
Check 30A fusible link (letter G , located in the fuse and fusible link box).
NOTE:
Refer to
SB-3, "Component Parts and Harness Connector Location"
.
OK or NG
OK
>> GO TO 2.
NG
>> If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse. Refer to
PG-3, "POWER SUPPLY ROUTING CIRCUIT"
Terminal
Voltage (V)
(Approx.)
(+)
(–)
Pre-crash seat
belt control unit
connector
Terminal
B142
13 Ground
Battery
voltage
PHIA1126E
PRE-CRASH SEAT BELT
SB-17
C
D
E
F
G
I
J
K
L
M
A
B
SB
2.
CHECK SELF-DIAGNOSTIC RESULT
With CONSULT-II
Select “SELF-DIAG RESULTS” and then make sure the “MOTOR
PWR SUP CIRC” is displayed.
Without CONSULT-II
When CONSULT-II is not used, omit this inspection, and then GO TO 3.
Displayed B2454?
Yes
>> GO TO 3.
No
>> Motor power supply system is normal.
3.
CHECK MOTOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit connector.
3.
Check voltage between pre-crash seat belt control unit harness
connector and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace harness.
4.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT GROUND CIRCUIT
1.
Disconnect pre-crash seat belt control unit connector.
2.
Check continuity between pre-crash seat belt control unit har-
ness connector and ground.
OK or NG
OK
>> Motor power supply and ground circuit is OK.
NG
>> Repair or replace harness.
CONSULT-II display
CONSULT-II display code
NO DTC
—
MOTOR PWR SUP CIRC
B2454
PHIA0770E
Terminal
Voltage (V)
(Approx.)
(+)
(–)
Pre-crash seat
belt control unit
connector
Terminal
B142
2
Ground
Battery voltage
PHIA1127E
Terminal
Continuity
Pre-crash seat
belt control unit
connector
Terminal
Ground
B142
5
Yes
26
PHIA1128E
SB-18
PRE-CRASH SEAT BELT
Check Seat Belt Buckle Switch (Driver Side) Circuit
NHS0008B
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
With CONSULT-II
Select “SB SW LH SIG” on DATA MONITOR screen, and then make sure that ON/OFF display changes syn-
chronized with the insertion operation to the seat belt buckle.
Without CONSULT-II
1.
Turn ignition switch ON.
2.
Check voltage between seat belt buckle switch (driver side) har-
ness connector and ground.
OK or NG
OK
>> Seat belt buckle switch (driver side) circuit is OK.
NG
>> GO TO 2.
SB SW LH SIG
When driver seat belt is not fastened
: OFF
When driver seat belt is fastened
: ON
PHIA0765E
Terminal
Condition
Voltage (V)
(Approx.)
(+)
(–)
Seat belt buckle
switch connector
(driver side)
Terminal
B203
1
Ground
When seat belt is
unfastened
0
When seat belt is
fastened
Battery
voltage
PHIA1129E
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