Infiniti M35/M45 Y50. Manual — part 1037
PRE-CRASH SEAT BELT
SB-19
C
D
E
F
G
I
J
K
L
M
A
B
SB
2.
CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) HARNESS
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit and seat belt buckle switch (driver side) connector.
3.
Check continuity between pre-crash seat belt control unit har-
ness connector and seat belt buckle switch (driver side) harness
connector.
4.
Check continuity between pre-crash seat belt control unit har-
ness connector and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness.
3.
CHECK LH SEAT BELT SWITCH
Check continuity between seat belt buckle switch (driver side) while
performing the insertion operation to the seat belt buckle.
OK or NG
OK
>> GO TO 4.
NG
>> Replace seat belt buckle switch (driver side).
4.
CHECK LH SEAT BELT SWITCH GROUND CIRCUIT HARNNES
Check continuity between seat belt buckle switch (driver side) har-
ness connector and ground.
OK or NG
OK
>> Check harness connection.
●
If it is OK, replace pre-crash seat belt control unit.
●
If it is NG, repair or replace malfunction part.
NG
>> Repair or replace harness.
A
B
Continuity
Pre-crash seat
belt control unit
connector
Terminal
Seat belt buckle
switch (driver side)
connector
Terminal
B142
10 B203
1
Yes
A
Ground
Continuity
Pre-crash seat belt
control unit connector
Terminal
B142
10
No
PHIA1130E
Seat belt buckle
switch connector
(driver side)
Terminal Condition
Continuity
B203
1
2
When seat belt is unfastened
Yes
When seat belt is fastened
No
PHIA1131E
Terminal
Continuity
Seat belt buckle switch
connector (driver side)
Terminal
Ground
B203
2
Yes
PHIA1132E
SB-20
PRE-CRASH SEAT BELT
Check Seat Belt Buckle Switch (Passenger Side) Circuit
NHS0008C
1.
CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
With CONSULT-II
Select “SB SW RH SIG” on DATA MONITOR screen, and then make
sure that ON/OFF display changes synchronized 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 (passenger side)
harness connector and ground.
OK or NG
OK
>> Seat belt buckle switch (passenger side) circuit is OK.
NG
>> GO TO 2.
2.
CHECK SEAT BELT BUCKLE SWITCH (PASSENGER SIDE) HARNESS
1.
Turn ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit and seat belt buckle switch (passenger side) connector.
3.
Check continuity between pre-crash seat belt control unit har-
ness connector and seat belt buckle switch (passenger side)
harness connector.
4.
Check continuity between pre-crash seat belt control unit har-
ness connector and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness.
SB SW RH SIG
When passenger seat belt is not fastened
:OFF
When passenger seat belt is fastened
:ON
PHIA0764E
Terminal
Condition
Voltage (V)
(Approx.)
(+)
(–)
Seat belt buckle
switch connector
(passenger side)
Terminal
B253
1
Ground
When seat belt is
unfastened
0
When seat belt is
fastened
5
PHIA1129E
A
B
Continuity
Pre-crash seat
belt control unit
connector
Terminal
Seat belt buckle
switch (passenger
side) connector
Terminal
B142
8
B253
1
Yes
A
Ground
Continuity
Pre-crash seat belt
control unit connector
Terminal
B142
8
No
PHIA1133E
PRE-CRASH SEAT BELT
SB-21
C
D
E
F
G
I
J
K
L
M
A
B
SB
3.
CHECK RH SEAT BELT SWITCH
Check continuity between seat belt buckle switch (passenger side)
while performing the insertion operation to the seat belt buckle.
OK or NG
OK
>> GO TO 4.
NG
>> Replace seat belt buckle (passenger side).
4.
CHECK RH SEAT BELT SWITCH GROUND CIRCUIT HARNNES
Check continuity between seat belt buckle switch (passenger side)
harness connector and ground.
OK or NG
OK
>> Check harness connection.
●
If it is OK, replace pre-crash seat belt control unit.
●
If it is NG, repair or replace malfunction part.
NG
>> Repair or replace harness.
Check Brake Pedal Stroke Sensor Circuit [B2453]
NHS0008D
1.
CHECK SELF-DIAGNOSTIC RESULT
With CONSULT-II
Select “SELF-DIAG RESULTS”, and then make sure that “BR
STROKE SEN CIRC” is displayed.
Without CONSULT-II
When CONSULT-II is not used, omit this inspection, and then GO TO 2.
Displayed B2453?
Yes
>> GO TO 3.
No
>> GO TO 2.
Seat belt buckle
switch connector
(passenger side)
Terminal Condition
Continuity
B253
1
2
When seat belt is unfastened
Yes
When seat belt is fastened
No
PHIA1131E
Terminal
Continuity
Seat belt buckle switch
connector (passenger side)
Terminal
Ground
B253
2
Yes
PHIA1132E
CONSULT-II display
CONSULT-II display code
NO DTC
—
BR STROKE SEN CIRC
B2453
PHIA0769E
SB-22
PRE-CRASH SEAT BELT
2.
CHECK PRE-CRASH SEAT BELT CONTOROL UNIT INPUT SIGNAL
With CONSULT-II
Select “B PEDAL SIG1” and “B PEDAL SIG2”, and then make sure that the voltage changes synchronized
with brake pedal operation.
Without CONSULT-II
1.
Turn ignition switch ON.
2.
Check voltage between pre-crash seat belt control unit harness
connector and ground.
OK or NG
OK
>> Brake pedal stroke sensor system is normal.
NG
>> GO TO 3.
B PEDAL SIG1
Brake released
→
depressed
: Approx. 1
→
4V
B PEDAL SIG 2
Brake released
→
depressed
: Approx. 4
→
1V
PHIA0766E
Terminal
Condition
Voltage (V)
(Approx.)
(+)
(–)
Pre-crash seat
belt control unit
connector
Terminal
B142
16
Ground
Brake released
→
depressed
1
→
4
20
4
→
1
PHIA1134E
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