Infiniti Q45. Manual — part 788
PRE-CRASH SEAT BELT
SB-31
C
D
E
F
G
I
J
K
L
M
A
B
SB
3.
CHECK BRAKE PEDAL STROKE SENSOR HARNESS
1.
Turn the ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit connector and brake
pedal stroke sensor connector.
3.
Check continuity between pre-crash seat belt control unit har-
ness connector B318 terminals 16, 18, 20, and 21 and brake
pedal stroke sensor harness connector M405 terminals 1, 2, 3,
and 4.
4.
Check continuity between pre-crash seat belt control unit harness connector B318 terminals 16, 18, 20,
and 21 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.
4.
CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1.
Connect pre-crash seat belt control unit connector.
2.
Turn the ignition switch ON.
3.
Check voltage between pre-crash seat belt control unit harness
connector B318 terminal 18 and ground.
OK or NG
OK
>> GO TO 5.
NG
>> Replace pre-crash seat belt control unit.
5.
CHECK BRAKE PEDAL STROKE SENSOR
Check continuity between brake pedal stroke sensor terminal 2 and
terminals 1, 3 while performing brake operation.
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
>> Replace brake pedal stroke sensor.
16 (W) - 3(W)
: Continuity should exist.
18 (R) - 2(R)
: Continuity should exist.
20 (G) - 1(G)
: Continuity should exist.
21 (B) - 4(B)
: Continuity should exist.
16 (W) - Ground
: Continuity should not exist.
18 (R) - Ground
: Continuity should not exist.
20 (G) - Ground
: Continuity should not exist.
21 (B) - Ground
: Continuity should not exist.
PHIA0754E
18 (R) - Ground
: Approx. 5V
PHIA0755E
Terminal
Condition
Resistance [K
Ω
]
2
1
Brake released
→
depressed
1.0
→
0.2
3
Brake released
→
depressed
0.2
→
1.0
PHIA0756E
SB-32
PRE-CRASH SEAT BELT
Check Pre-Crash Seat Belt Motor LH Circuit [B2452]
NHS00042
1.
CHECK LH SEAT BELT MOTOR CIRCUIT
With CONSULT-II
Select “SELF-DIAG RESULTS” of CONSULT-II, and then make sure
that “SB MOTOR LH CIRC” is displayed.
Without CONSULT-II
When CONSULT-II is not used, omit this inspection, and then GO TO 2.
Displayed B2452?
Yes
>> GO TO 2.
No
>> Pre-crash seat belt motor LH circuit is OK.
2.
CHECK LH SEAT BELT MOTOR HARNESS
1.
Turn the ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit connector and pre-
crash seat belt motor LH connector.
3.
Check continuity between pre-crash seat belt control unit har-
ness connector B318 terminals 4, 6 and pre-crash seat belt
motor LH harness connector B117 terminals 1, 2.
4.
Check continuity between pre-crash seat belt control unit har-
ness connector B318terminals 4, 6 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness.
3.
CHECK SEAT BELT MOTOR
Check continuity between pre-crash seat belt motor LH B117 termi-
nals 1 and 2.
OK or NG
OK
>> Replace pre-crash seat belt control unit.
NG
>> Replace pre-crash seat belt motor LH.
CONSULT-II display
CONSULT-II display code
NO DTC
–
SB MOTOR LH CIRC
B2452
PHIA0768E
4(GY/W) - 1(G/Y)
: Continuity should exist.
6(L/Y) - 2(G/R)
: Continuity should exist.
4(GY/W) - Ground
: Continuity should not exist.
6(L/Y) - Ground
: Continuity should not exist.
PHIA0757E
1- 2
: Continuity should exist.
PHIA0758E
PRE-CRASH SEAT BELT
SB-33
C
D
E
F
G
I
J
K
L
M
A
B
SB
Check Pre-Crash Seat Belt Motor RH Circuit [B2451]
NHS00043
1.
CHECK RH SEAT BELT MOTOR CIRCUIT
With CONSULT-II
Select SELF-DIAG RESULTS” of CONSULT-II, and then make sure
that “SB MOTOR RH CIRC” is displayed.
Without CONSULT-II
When CONSULT-II is not used, omit this inspection, and then GO TO 2.
Displayed B2451?
Yes
>> GO TO 2.
No
>> Pre-crash seat belt motor RH circuit is OK.
2.
CHECK RH SEAT BELT MOTOR HARNESS
1.
Turn the ignition switch OFF.
2.
Disconnect pre-crash seat belt control unit connector and pre-
crash seat belt motor RH connector.
3.
Check continuity between pre-crash seat belt control unit har-
ness connector B318 terminals 1, 3 and pre-crash seat belt
motor RH harness connector B317 terminals 1, 2.
4.
Check continuity between pre-crash seat belt control unit har-
ness connector B318 terminals 1, 3 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness.
3.
CHECK SEAT BELT MOTOR
Check continuity between pre-crash seat belt motor RH B317 termi-
nals 1 and 2.
OK or NG
OK
>> Replace pre-crash seat belt control unit.
NG
>> Replace pre-crash seat belt motor RH.
CONSULT-II display
CONSULT-II display code
NO DTC
–
SB MOTOR RH CIRC
B2451
PHIA0767E
1 (GY/W) - 2(GY/W)
: Continuity should exist.
3 (L/Y) - 1(L/Y)
: Continuity should exist.
1(GY/W) - Ground
: Continuity should not exist.
3 (L/Y) - Ground
: Continuity should not exist.
PHIA0759E
1- 2
: Continuity should exist.
PHIA0758E
SB-34
PRE-CRASH SEAT BELT
Check Brake Pedal Stroke Sensor Shield Wire Circuit
NHS00044
1.
CHECK PRE-CRASH SEAT BELT INPUT SIGNAL
With CONSULT-II
Select “B PEDAL SIG1 and 2” on DATA MONITOR screen, and then
make sure that the voltage does not change if brake pedal is not
operated.
NOTE:
Diagnosis should be performed with engine running, audio and air
conditioner operating.
Without CONSULT-II
1.
Start engine.
2.
Check voltage between pre-crash seat belt harness connector
B318 terminals 16, 20 and ground without brake pedal opera-
tion.
OK or NG
OK
>> Brake pedal stroke sensor shield wire circuit is OK.
NG
>> Check shield wire for damage. Repair or replace if necessary.
B PEDAL SIG1
Brake released
: There is no change in the voltage
value, and it is almost constant
B PEDAL SIG2
Brake released
:There is no change in the voltage
value, and it is almost constant.
Connector
Terminal
(Wire color)
Condition
Voltage [V]
(Approx.)
(+)
(–)
B318
16(W)
Ground
Brake released When
engine is started and
audio and air conditioner
are operating
There is no change in
the voltage value, and
it is almost constant.
20(G)
There is no change in
the voltage value, and
it is almost constant.
PHIA0766E
PHIA0760E
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