2007 INFINITI M35 air condition

PRE-CRASH SEAT BELT
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Revision: 2007 April2007 M35/M45
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.
AB
Continuity Pre-crash seat
belt control unit
connectorTerminalSeat belt buckle
switch (driver side)
connectorTerminal
B142 10 B203 1 Yes
A
GroundContinuity
Pre-crash seat belt
control unit connectorTerminal
B142 10 No
PHIA1130E
Seat belt buckle
switch connector
(driver side) Terminal Condition Continuity
B203 1 2When 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
Revision: 2007 April2007 M35/M45
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
ConditionVoltage (V)
(Approx.) (+)
(–) Seat belt buckle
switch connector
(passenger side) Terminal
B253 1 GroundWhen seat belt is
unfastened0
When seat belt is
fastened5
PHIA1129E
AB
Continuity Pre-crash seat
belt control unit
connectorTe r m i n a lSeat belt buckle
switch (passenger
side) connectorTerminal
B142 8 B253 1 Yes
A
GroundContinuity
Pre-crash seat belt
control unit connectorTerminal
B142 8 No
PHIA1133E

PRE-CRASH SEAT BELT
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Revision: 2007 April2007 M35/M45
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?
Ye s > > G O T O 3 .
No >> GO TO 2.
Seat belt buckle
switch connector
(passenger side)Terminal Condition Continuity
B253 1 2When 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-24
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
5. CHECK BRAKE PEDAL STROKE SENSOR
Check continuity between brake pedal stroke sensor while perform-
ing 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.
Check Pre-Crash Seat Belt Motor LH Circuit [B2452]NHS0008E
1. CHECK SELF-DIAGNOSTIC RESULT
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.
Brake pedal stroke
sensor connectorTerminal ConditionResistance
(KΩ)
(Approx.)
E125 21
Brake released → depressed1.0 → 0.2
30.2 → 1.0
PHIA1137E
CONSULT-II display CONSULT-II display code
NO DTC —
SB MOTOR LH CIRC B2452
PHIA0768E

PRE-CRASH SEAT BELT
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Revision: 2007 April2007 M35/M45
3. CHECK SEAT BELT MOTOR RH
Check continuity between pre-crash seat belt motor RH.
OK or NG
OK >> Replace pre-crash seat belt control unit.
NG >> Replace pre-crash seat belt motor RH.
Check Brake Pedal Stroke Sensor Shield Wire Circuit NHS0008G
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.
OK or NG
OK >> Brake pedal stroke sensor shield wire circuit is OK.
NG >> Check shield wire for damage. Repair or replace if necessary.
Pre-crash seat belt
motor RH connectorTerminal Continuity
B422 1 2 Yes
PHIA1139E
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.
Terminal
ConditionVoltage (V)
(Approx.) (+)
(–) Pre-crash seat
belt control unit
connectorTerminal
B14216
GroundPerformed with
engine running, audio
and air conditioner
operating and brake
pedal released.There is no
change in the
voltage value,
and it is almost
constant 20
PHIA0766E
PHIA1141E

SC-2
PRECAUTIONS
Revision: 2007 April2007 M35/M45
PRECAUTIONS PFP:00011
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NKS003NB
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Power Generation Voltage Variable Control SystemNKS003NC
CAUTION:
For this model, the battery current sensor that is installed to the battery cable at the negative terminal
measures the charging/discharging current of the battery, and performs various controls. If the electri-
cal component or the ground wire is connected directly to the battery terminal, the current other than
that being measured with the battery current sensor is charging to or discharging from the battery.
This condition causes the malfunction of the control, and then the battery discharge may occur. Do
not connect the electrical component or the ground wire directly to the battery terminal.

CHARGING SYSTEM
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Revision: 2007 April2007 M35/M45
2. CHECK “L” TERMINAL CIRCUIT (OPEN)
1. Disconnect alternator connector.
2. Apply ground to alternator harness connector terminal.
3. Check condition the charge warning lamp with the ignition
switch in the ON position.
OK or NG
OK >> Go to SC-25, "Trouble Diagnosis with Starting/Charging System Tester (Charging)" .
NG >> Check the following.

Harness for open between combination meter and alternator

Harness for open between combination meter and fuse

Charge warning lamp (Combination meter)
DIAGNOSTIC PROCEDURE 2
Check “L” Terminal Circuit (Short)
1. CHECK “L” TERMINAL CIRCUIT (SHORT)
1. Turn ignition switch OFF.
2. Disconnect alternator connector.
3. Turn ignition switch ON.
Charge warning lamp should illuminate?
YES >> Check the following.

Harness for short between combination meter and alternator

Charge warning lamp (Combination meter)
NO >> Go to SC-25, "
Trouble Diagnosis with Starting/Charging System Tester (Charging)" .
DIAGNOSTIC PROCEDURE 3
Check “S” Terminal Circuit
1. CHECK “S” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check if “S” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “S” terminal connection. Confirm repair by performing complete Starting/Charging system
test. Refer to Technical Service Bulletin.
Alternator
connectorTerminal
GroundCondition
Ignition switch
positionCharge warning
lamp
F20 (VQ35DE)
E209 (VK45DE)3 ON illuminate
PKIB8807E

CHARGING SYSTEM
SC-29
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Revision: 2007 April2007 M35/M45
3. CHECK “B” TERMINAL CONNECTION (VOLTAGE DROP TEST)
1. Start engine, then engine running at idle and warm.
2. Check voltage between battery positive terminal and alternator
“B” terminal.
OK or NG
OK >> Go to SC-25, "Trouble Diagnosis with Starting/Charging
System Tester (Charging)" .
NG >> Check harness between battery and alternator for poor continuity.
Power Generation Voltage Variable Control System Operation InspectionNKS003NQ
CAUTION:

For this model, the battery current sensor that is installed to the battery cable at the negative ter-
minal measures the charging/discharging current of the battery, and performs various controls. If
the electrical component or the ground wire is connected directly to the battery terminal, the cur-
rent other than that being measured with the battery current sensor is charging to or discharging
from the battery. This condition causes the malfunction of the control, and then the battery dis-
charge may occur. Never connect the electrical component or the ground wire directly to the bat-
tery terminal.

When performing this inspection, always use the charged battery that completed the battery
inspection. (When the charging rate of the battery is low, the response speed of the voltage
change will become slow. This is a cause of an incorrect inspection.)
INSPECTION PROCEDURE
1. CHECK ECM (CONSULT-II)
Perform ECM self-diagnosis with CONSULT-II. Refer to the following.

VQ35DE: EC-123, "CONSULT-II Function (ENGINE)"

VK45DE: EC-826, "CONSULT-II Function (ENGINE)"
Self-diagnostic results content
No malfunction detected>> GO TO 2.
Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.
Terminals
Voltage
(Approx.)
(+)(–)
Alternator “B” terminal Terminal
Battery positive
terminalE205 [VQ35DE (2WD)]
E202 [VQ35DE (AWD)/VK45DE]1 Less than 0.2 V
PKIB8810E