2007 INFINITI QX56 charging

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ELECTRICAL
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SECTION SC
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CONTENTS
STARTING & CHARGING SYSTEM
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
Precaution for Power Generation Variable Voltage
Control System ..........................................................
2
PREPARATION ...................................................3
Special Service Tool .................................................3
Commercial Service Tool ..........................................3
BATTERY ............................................................4
How to Handle Battery ..............................................4
Trouble Diagnosis with Battery/Starting/Charging
System Tester ...........................................................
6
Removal and Installation ...........................................8
STARTING SYSTEM ..........................................9
System Description ...................................................9
Wiring Diagram - START - .......................................10
Trouble Diagnosis with Battery/Starting/Charging
System Tester .........................................................
10
Removal and Installation .........................................14
CHARGING SYSTEM .......................................15
System Description ..................................................15
Wiring Diagram - CHARGE - ...................................17
Trouble Diagnosis with Battery/Starting/Charging
System Tester .........................................................
17
Removal and Installation .........................................22
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
24
Battery .....................................................................24
Starter ......................................................................24
Generator ................................................................24

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< SERVICE INFORMATION >
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003533312
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 performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
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 har-
ness connectors.
Precaution for Power Generation Variable Voltage Control SystemINFOID:0000000003533313
CAUTION:
For this model, the battery current sensor that is installed to the negative battery cable measures the
charging/discharging current of the battery and performs various engine controls. If an electrical com-
ponent is connected directly to the negative battery terminal, the current flowing through that compo-
nent will not be measured by the battery current sensor. This condition may cause a malfunction of
the engine control system and battery discharge may occur. Do not connect an electrical component
or ground wire directly to the battery terminal.

PREPARATION
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< SERVICE INFORMATION >
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PREPARATION
Special Service ToolINFOID:0000000003533314
Commercial Service ToolINFOID:0000000003533315
Tool number
(Kent-Moore No.)
Tool nameDescription
—
(J-44373)
Battery/Starting/Charging system
testerModel 620
(J-48087)
Battery Service CenterTests and charges batteries
SEL403X
WKIA5280E
Tool nameDescription
Power toolLoosening bolts and nuts
PBIC0190E

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< SERVICE INFORMATION >
BATTERY
BATTERY
How to Handle BatteryINFOID:0000000003533316
CAUTION:
• If it becomes necessary to start the engine with a booster battery and jumper cables, use a 12-volt
booster battery.
• After connecting battery cables, ensure that they are tightly clamped to battery terminals for good
contact.
• Never add distilled water through the hole used to check specific gravity.
METHODS OF PREVENTING OVER-DISCHARGE
The following precautions must be taken to prevent over-discharging
a battery.
• The battery surface (particularly its top) should always be kept
clean and dry.
• The terminal connections should be clean and tight.
• At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as “low maintenance” and
“maintenance-free”.
• When the vehicle is not going to be used over a long period of
time, disconnect the negative battery terminal.
• Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep a
close check on charge condition to prevent over-discharge.
CHECKING ELECTROLYTE LEVEL
WARNING:
Do not allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touch-
ing a battery, do not touch or rub your eyes until you have thoroughly washed your hands. If acid con-
tacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.
MEL040F
MEL041F
MEL042F

BATTERY
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• Remove the cell plug using a suitable tool.
• Add distilled water up to the MAX level.
Sulfation
A battery will be completely discharged if it is left unattended
for a long time and the specific gravity will become less than
1.100. This may result in sulfation on the cell plates.
To determine if a battery has been sulfated, note its voltage and
current when charging it. As shown in the figure, less current
and higher voltage are observed in the initial stage of charging
sulfated batteries.
A sulfated battery may sometimes be brought back into service
by means of a long, slow charge, 12 hours or more, followed by
a battery capacity test.
SPECIFIC GRAVITY CHECK
1. Read hydrometer and thermometer indications at eye level.
2. Use the following chart to correct your hydrometer reading
according to electrolyte temperature.
Hydrometer Temperature Correction
MEL043F
PKIA2353E
MEL042FA
Battery electrolyte temperature °C (°F) Add to specific gravity reading
71 (160) 0.032
66 (150) 0.028
60 (140) 0.024
54 (130) 0.020
49 (120) 0.016
43 (110) 0.012
38 (100) 0.008
32 (90) 0.004
27 (80) 0
21 (70)−0.004
16 (60)−0.008
10 (50)−0.012
4 (40)−0.016
−1 (30)−0.020

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< SERVICE INFORMATION >
BATTERY
CHARGING THE BATTERY
CAUTION:
• Do not “quick charge” a fully discharged battery.
• Keep the battery away from open flame while it is being charged.
• When connecting the charger, connect the leads first, then turn on the charger. Do not turn on the
charger first, as this may cause a spark.
• If battery electrolyte temperature rises above 55°C (131°F), stop charging. Always charge battery at a
temperature below 55°C (131°F).
Charging Rates
Do not charge at more than 50 ampere rate.
NOTE:
The ammeter reading on your battery charger will automatically decrease as the battery charges. This indi-
cates that the voltage of the battery is increasing normally as the state of charge improves. The charging amps
indicated above refer to initial charge rate.
• If, after charging, the specific gravity of any two cells varies more than 0.050, the battery should be replaced.
Trouble Diagnosis with Battery/Starting/Charging System TesterINFOID:0000000003533317
CAUTION:
When working with batteries, always wear appropriate eye protection.
NOTE:
• To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be
done as a set from start to finish.
• If battery surface charge is detected while testing, the tester will prompt you to turn on the headlights to
remove the surface charge.
• If necessary, the tester will prompt you to determine if the battery temperature is above or below 0°C (32°F).
Choose the appropriate selection by pressing the up or down arrow button, then press “ENTER” to make the
selection.
−7 (20)−0.024
−12 (10)−0.028
−18 (0)−0.032
Corrected specific gravity Approximate charge condition
1.260 - 1.280 Fully charged
1.230 - 1.250 3/4 charged
1.200 - 1.220 1/2 charged
1.170 - 1.190 1/4 charged
1.140 - 1.160 Almost discharged
1.110 - 1.130 Completely discharged Battery electrolyte temperature °C (°F) Add to specific gravity reading
Amps Time
50 1 hour
25 2 hours
10 5 hours
5 10 hours

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< SERVICE INFORMATION >
BATTERY
8. Press “ENTER”, then test output code is displayed. Record the
test output code on the repair order.
9. Toggle back to the “DIAGNOSTIC SCREEN” for test results.
NOTE:
• If necessary, the tester will ask the user to determine if the bat-
tery has just been charged. Choose the appropriate selection
by pressing the up or down arrow button and then press the
“ENTER” button to make the selection.
• When testing a battery installed in a vehicle that has recently
been driven, select “BEFORE CHARGE”.
• If the battery has just been slow charged due to a “CHARGE &
RETEST” decision by the tester, and the tester asks the user
“BEFORE CHARGE/AFTER CHARGE”, select “AFTER CHARGE”.
DIAGNOSTIC RESULT ITEM CHART
Removal and InstallationINFOID:0000000003533318
REMOVAL
1. Disconnect the negative battery terminal and positive battery
terminal.
CAUTION:
Remove the negative battery terminal first.
2. Remove the battery cover.
3. Remove the battery clamp bolt and battery clamp.
4. Remove the battery.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
When installing, install the positive battery terminal first.
SEL576X
Diagnostic item Service procedure
GOOD BATTERYBattery is OK. Refer to SC-17, "
Trouble Diagnosis with Battery/Starting/Charging System
Te s t e r".
REPLACE BATTERYReplace battery.
Before replacing battery, clean the battery cable clamps and battery posts. Perform battery
test again with Battery/Starting/Charging system tester. If second test result is “Replace Bat-
tery”, then do so. Perform battery test again to confirm repair.
BAD CELL-REPLACEReplace the battery. Perform battery test again with Battery/Starting/Charging system tester to
confirm repair.
GOOD-RECHARGEPerform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.) Per-
form battery test again with Battery/Starting/Charging system tester.
CHARGE & RETESTPerform the slow battery charging. (Initial rate of charge is 10A for 12 hours.)
Perform battery test again with Battery/Starting/Charging system tester to confirm repair.
NOTE:
If the tester asks the user “BEFORE CHARGE/AFTER CHARGE”, select “AFTER
CHARGE”.
WKIA1385E
Battery clamp bolt : 14.7 N·m (1.5 kg-m, 11 ft-lb)
Battery terminal nut : 3.5 N·m (0.36 kg-m, 31 in-lb)

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< SERVICE INFORMATION >
STARTING SYSTEM
Wiring Diagram - START -
INFOID:0000000003533320
Trouble Diagnosis with Battery/Starting/Charging System TesterINFOID:0000000003533321
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.
AWBWA0151G