Nissan Pathfinder (2008 year). Manual — part 509
PCS-40
< ON-VEHICLE MAINTENANCE >
[POWER DISTRIBUTION SYSTEM]
PRE-INSPECTION FOR DIAGNOSTIC
ON-VEHICLE MAINTENANCE
PRE-INSPECTION FOR DIAGNOSTIC
Basic Inspection
INFOID:0000000001712730
The engine start function, door lock function, power distribution system and NATS-NVIS system are closely
related to each other regarding control. Narrow down the functional area in question by performing basic
inspection to identify which function is malfunctioning. The vehicle security function can operate only when the
door lock and power distribution system are operating normally. Therefore, it is easy to identify any factor
unique to the vehicle security system by performing the vehicle security operation check after basic inspection.
1.
CHECK DOOR LOCK OPERATION
1.
Check the door lock for normal operation with the keyfob or Intelligent Key (if equipped) and door request
switch.
Successful door lock operation with the keyfob or Intelligent Key (if equipped) and request SW indicates
that the remote keyless entry receiver and inside key antenna (with Intelligent Key) required for engine
start are functioning normally.
Identify the malfunctioning point by referring to the DLK section if the door cannot be unlocked.
Can the door be locked with the Intelligent Key and door request switch?
YES
>> GO TO 2
NO
>> Refer to
2.
CHECK ENGINE STARTING
1.
Checks that the engine starts.
Does the engine start?
YES
>> GO TO 3
NO
>> Refer to
3.
CHECK VEHICLE SECURITY SYSTEM
1.
Check the vehicle security system for normal operation.
The vehicle security function can operate only when the door lock and power distribution functions are
operating normally.
Therefore, it is easy to identify any factor unique to the vehicle security by performing the vehicle security
operation check after this basic inspection.
>> Refer to
PCS
BCM (BODY CONTROL MODULE)
PCS-41
< ON-VEHICLE REPAIR >
[POWER DISTRIBUTION SYSTEM]
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ON-VEHICLE REPAIR
BCM (BODY CONTROL MODULE)
Removal and Installation
INFOID:0000000001712731
PG
PG-1
ELECTRICAL & POWER CONTROL
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CONTENTS
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
PRECAUTION . . . . . . . . . . . ...
PRECAUTIONS . . . . . . . . . . . . ...
Precaution for Power Generation Variable Voltage
Control System . . . . . . . . . . . . . . ..
PREPARATION . . . . . . . . . . .
PREPARATION . . . . . . . . . . . . ...
Special Service Tool . . . . . . . . . . . .....
Commercial Service Tool . . . . . . . . . . ..
BASIC INSPECTION . . . . . . . . .
BATTERY . . . . . . . . . . . . . . .
How to Handle Battery . . . . . . . . . . . ..
Work Flow . . . . . . . . . . . . . . . .....
COMPONENT DIAGNOSIS . . . . . . ..
POWER SUPPLY ROUTING CIRCUIT . . . ...
Schematic . . . . . . . . . . . . . . . .....
Wiring Diagram - POWER - . . . . . . . . . ..
Fuse . . . . . . . . . . . . . . . . . .
Fusible Link . . . . . . . . . . . . . . . .
Circuit Breaker (Built Into BCM) . . . . . . . ..
GROUND CIRCUIT . . . . . . . . . . .
Ground Distribution . . . . . . . . . . . . .
HARNESS . . . . . . . . . . . . . . ..
Harness Layout . . . . . . . . . . . . . ...
Wiring Diagram Codes (Cell Codes) . . . . . ...
ELECTRICAL UNITS LOCATION . . . . .
Electrical Units Location . . . . . . . . . . ..
HARNESS CONNECTOR . . . . . . . . .
Description . . . . . . . . . . . . . . . ...
ELECTRICAL UNITS . . . . . . . . . .
Terminal Arrangement . . . . . . . . . . . .
STANDARDIZED RELAY . . . . . . . . .
Description . . . . . . . . . . . . . . . ...
SUPER MULTIPLE JUNCTION (SMJ) . . . .
Terminal Arrangement . . . . . . . . . . . .
FUSE BLOCK-JUNCTION BOX (J/B) . . . ..
Terminal Arrangement . . . . . . . . . . . .
FUSE AND FUSIBLE LINK BOX . . . . . ..
Terminal Arrangement . . . . . . . . . . . .
FUSE AND RELAY BOX . . . . . . . . ..
Terminal Arrangement . . . . . . . . . . . .
ON-VEHICLE REPAIR . . . . . . . . .
BATTERY . . . . . . . . . . . . . . ..
Removal and Installation . . . . . . . . . . .
SERVICE DATA AND SPECIFICATIONS
(SDS) . . . . . . . . . . . . . . .
BATTERY . . . . . . . . . . . . . . ..
PG-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000001547048
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 SR 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 SR 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 System
INFOID:0000000001547049
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.
PG
PREPARATION
PG-3
< PREPARATION >
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PREPARATION
PREPARATION
Special Service Tool
INFOID:0000000001547050
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service Tool
INFOID:0000000001547051
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J-48087)
Battery Service Center
Tests battery.
For operating instructions, refer to Technical
Service Bulletin and Battery Service Center
User Guide.
—
(J-44373) Model 620
Battery/Starting/Charging system
tester
Tests starting and charging systems.
For operating instructions, refer to Technical
Service Bulletin.
WKIA5280E
SEL403X
Tool number
Tool name
Description
Power tool
Loosening bolts and nuts
PBIC0190E
PG-4
< BASIC INSPECTION >
BATTERY
BASIC INSPECTION
BATTERY
How to Handle Battery
INFOID:0000000001712683
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 battery cable from the negative terminal. (If
the vehicle has an extended storage switch, turn it off.)
• 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:
Never allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touch-
ing a battery, never 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
ELA0349D
MEL042F
PG
BATTERY
PG-5
< BASIC INSPECTION >
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• Remove the cell plug using a suitable tool.
• Add distilled water up to the MAX level.
Sulphation
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 sulphation on the cell plates.
To determine if a battery has been “sulphated”, note its voltage
and current when charging it. As shown in the figure, less cur-
rent and higher voltage are observed in the initial stage of
charging sulphated batteries.
A sulphated battery may sometimes be brought back into ser-
vice by means of a long, slow charge, 12 hours or more, fol-
lowed by a battery capacity test.
SPECIFIC GRAVITY CHECK
1.
Read hydrometer and thermometer indications at eye level.
2.
Use the chart below to correct your hydrometer reading accord-
ing 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
−
7 (20)
−
0.024
PG-6
< BASIC INSPECTION >
BATTERY
CHARGING THE BATTERY
CAUTION:
• Never “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. Never 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.
Work Flow
INFOID:0000000001712684
TROUBLE DIAGNOSIS WITH BATTERY SERVICE CENTER
For battery testing, use Battery Service Center (J-48087). For details and operating instructions, refer to Tech-
nical Service Bulletin and/or Battery Service Center User Guide.
−
12 (10)
−
0.028
−
18 (0)
−
0.032
Battery electrolyte temperature [
°
C (
°
F)]
Add to specific gravity reading
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
Amps
Time
50
1 hour
25
2 hours
10
5 hours
5
10 hours
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