2007 INFINITI M35 control

SB-26
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
Check Pre-Crash Seat Belt Motor RH Circuit [B2451]NHS0008F
1. CHECK SELF-DIAGNOSTIC RESULT
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 SEAT BELT MOTOR RH HARNESS
1. Turn 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 and pre-crash seat belt motor RH harness con-
nector.
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.
CONSULT-II display CONSULT-II display code
NO DTC —
SB MOTOR RH CIRC B2451
PHIA0767E
AB
Continuity Pre-crash seat
belt control unit
connectorTe r m i n a lPre-crash seat
belt motor RH
connectorTerminal
B1421
B4222
Ye s
3 1
A
GroundContinuity
Pre-crash seat belt
control unit connectorTerminal
B1421
No
3
PHIA1140E

PRE-CRASH SEAT BELT
SB-27
C
D
E
F
G
I
J
K
L
MA
B
SB
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

SB-28
PRE-CRASH SEAT BELT
Revision: 2007 April2007 M35/M45
Removal and Installation of Pre-Crash Seat Belt Control UnitNHS0008H
REMOVAL
1. Remove trunk side finisher LH. Refer to EI-56, "Removal and Installation for Trunk Room Trim" .
2. Remove pre-crash seat belt control unit mounting bolts.
3. Remove pre-crash seat belt control unit connector, and the pre-
crash seat belt control unit.
INSTALLATION
Install in the reverse order of removal.
PHIA1125E

SC-1
STARTING & CHARGING SYSTEM
K ELECTRICAL
CONTENTS
C
D
E
F
G
H
I
J
L
M
SECTION SC
A
B
SC
Revision: 2007 April2007 M35/M45
STARTING & CHARGING SYSTEM
PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Precautions for Power Generation Voltage Variable
Control System ......................................................... 2
PREPARATION ........................................................... 3
Special Service Tools ............................................... 3
Commercial Service Tools ........................................ 3
BATTERY .................................................................... 4
How to Handle Battery ............................................. 4
METHODS OF PREVENTING OVER-DIS-
CHARGE ............................................................... 4
CHECKING ELECTROLYTE LEVEL .................... 5
SPECIFIC GRAVITY CHECK ............................... 5
CHARGING THE BATTERY ................................. 6
Trouble Diagnosis with Battery Service Center ........ 7
Removal and Installation .......................................... 7
REMOVAL ............................................................. 7
INSTALLATION ..................................................... 7
STARTING SYSTEM .................................................. 8
System Description .................................................. 8
Wiring Diagram — START — ................................... 9
VQ35DE ENGINE MODELS ................................. 9
VK45DE ENGINE MODELS ............................... 10
Trouble Diagnosis with Starting/Charging System
Tester (Starting) ....................................................... 11
DIAGNOSTIC PROCEDURE 1 ........................... 12
DIAGNOSTIC PROCEDURE 2 ........................... 13
MINIMUM SPECIFICATION OF CRANKING
VOLTAGE REFERENCING COOLANT TEM-
PERATURE ......................................................... 13
Removal and Installation ........................................ 14
VQ35DE ENGINE MODELS (2WD) .................... 14
VQ35DE ENGINE MODELS (AWD) ................... 15
VK45DE ENGINE MODELS ............................... 16Disassembly and Assembly .................................... 17
VQ35DE ENGINE MODELS (2WD) .................... 17
VQ35DE ENGINE MODELS (AWD) .................... 18
VK45DE ENGINE MODELS ................................ 19
Inspection After Disassembly ................................. 19
PINION/CLUTCH CHECK ................................... 19
CHARGING SYSTEM ............................................... 20
System Description ................................................. 20
DESCRIPTION .................................................... 20
MALFUNCTION INDICATOR .............................. 20
POWER GENERATION VOLTAGE VARIABLE
CONTROL SYSTEM ........................................... 21
Wiring Diagram — CHARGE — ............................. 22
VQ35DE ENGINE MODELS (2WD) .................... 22
VQ35DE ENGINE MODELS (AWD) .................... 23
VK45DE ENGINE MODELS ................................ 24
Trouble Diagnosis with Starting/Charging System
Tester (Charging) .................................................... 25
PRELIMINARY INSPECTION ............................. 26
DIAGNOSTIC PROCEDURE 1 ........................... 26
DIAGNOSTIC PROCEDURE 2 ........................... 27
DIAGNOSTIC PROCEDURE 3 ........................... 27
DIAGNOSTIC PROCEDURE 4 ........................... 28
Power Generation Voltage Variable Control System
Operation Inspection .............................................. 29
Removal and Installation ........................................ 31
VQ35DE ENGINE MODELS ............................... 31
VK45DE ENGINE MODELS ................................ 33
Disassembly and Assembly .................................... 35
VQ35DE ENGINE MODELS ............................... 35
VK45DE ENGINE MODELS ................................ 36
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 37
Battery .................................................................... 37
Starter ..................................................................... 37
Alternator ................................................................ 37

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.

SC-20
CHARGING SYSTEM
Revision: 2007 April2007 M35/M45
CHARGING SYSTEMPFP:23100
System Description NKS005BX
DESCRIPTION
The alternator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times

through 10A fuse [No. 36, located in the fuse, fusible link and relay block (J/B)]

to alternator terminal 4 (“S” terminal).
“B” terminal supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 4 (“S” terminal) detecting the input voltage.
The alternator is grounded to the engine block.
With the ignition switch in the ON or START position, power is supplied

through 10A fuse [No. 14, located in the fuse block (J/B)]

to combination meter terminal 12 for the charge warning lamp.
Ground is supplied at signal

to combination meter terminal 22

through alternator terminal 3 (“L” terminal).
Then power and ground are supplied, the charge warning lamp will illuminate.
When the alternator is providing sufficient voltage with the engine running, the ground is opened and the
charge warning lamp will go off.
If the charge warning lamp illuminates with the engine running, a malfunction is indicated.
Ground is supplied

to alternator terminal 2 (“E” terminal)

through grounds E222, E223 and E224. (VQ35DE)

through ground E212. (VK45DE)
MALFUNCTION INDICATOR
The IC regulator warning function activates to illuminate the charge warning lamp, if any of the following symp-
toms occur while alternator is operating:

Excessive voltage is produced.

No voltage is produced.

CHARGING SYSTEM
SC-21
C
D
E
F
G
H
I
J
L
MA
B
SC
Revision: 2007 April2007 M35/M45
POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
Power generation voltage variable control system that controls the power generation voltage of the alternator
has been adopted. By performing the power generation voltage variable control, the engine load due to the
power generation of the alternator is reduced and fuel consumption is decreased.
Operation Description

The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.

ECM judges whether to perform the power generation voltage variable control according to the battery
condition.

When performing the power generation voltage variable control, ECM calculates the target power genera-
tion voltage according to the battery condition and sends the calculated value as the power generation
command value to IPDM E/R.

IPDM E/R converts the received power generation command value into the power generation command
signal (PWM signal) and sends it to the IC regulator.

The IC regulator controls the power generation voltage by the target power generation voltage based on
the received power generation command signal.

When there is no power generation command signal, the alternator performs the normal power generation
according to the characteristic of the IC regulator.
NOTE:
When any malfunction is detected in the power generation voltage variable control system, the power genera-
tion is performed according to the characteristic of the IC regulator of the alternator.
Main Component Part
BATTERY CURRENT SENSOR

Battery current sensor (1) is installed to the battery cable at the
negative terminal, and it detects the charging/discharging cur-
rent of the battery and sends the voltage signal to ECM accord-
ing to the current value.
SKIB5009E
PKIB8806E

CHARGING SYSTEM
SC-29
C
D
E
F
G
H
I
J
L
MA
B
SC
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