2008 INFINITI QX56 wiring diagram

GI-6
< HOW TO USE THIS MANUAL >
HOW TO FOLLOW TROUBLE DIAGNOSES
HOW TO FOLLOW TROUBLE DIAGNOSES
DescriptionINFOID:0000000001539187
NOTICE:
Trouble diagnoses indicate work procedures required to diagnose problems effectively. Observe the following
instructions before diagnosing.
• Before performing trouble diagnoses, read the “Work Flow” in each section.
• After repairs, re-check that the problem has been completely eliminated.
• Refer to Component Parts and Harness Connector Location for the Systems described in each section for
identification/location of components and harness connectors.
• When checking circuit continuity, ignition switch should be OFF.
• Refer to the Circuit Diagram for quick pinpoint check. If you need to check circuit continui ty between harness connectors in more detail, such as when a sub-har-
ness is used, refer to Wiring Diagram in each individual section and Harness Layout in PG section for identi-
fication of harness connectors.
• Before checking voltage at connectors, check battery voltage.
• After accomplishing the Diagnosis Procedures and Elec trical Components Inspection, make sure that all
harness connectors are reconnected as they were.
How to Follow Test Grou ps in Trouble DiagnosisINFOID:0000000001539188
1. Test group number and test group title
• Test group number and test group title are s hown in the upper portion of each test group.
2. Work and diagnosis procedure • Start to diagnose a problem using procedures indicated in enclosed test groups.
3. Questions and results • Questions and required results are indicated in test group.
4. Action • Next action for each test group is indicated based on result of each question.
JPAIA0021GB
Revision: March 2010 2008 QX56

HOW TO READ WIRING DIAGRAMSGI-9
< HOW TO USE THIS MANUAL >
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Connector symbolsINFOID:0000000001539190
Most of connector symbols in wiring diagrams are shown from the terminal side.
• Connector symbols shown from the terminal side are enclosed by a single line and followed by the direction mark.
• Connector symbols shown from the harness side are enclosed by a double line and followed by the direction mark.
• Certain systems and components, especially those related to
OBD, may use a new style slide-locking type harness connector.
For description and how to disconnect, refer to PG section,
“Description”, “HARNESS CONNECTOR”.
• Male and female terminals Connector guides for male terminals are shown in black and
female terminals in white in wiring diagrams.
SAIA0257E
SGI363
Revision: March 2010 2008 QX56

GI-10
< HOW TO USE THIS MANUAL >
HOW TO READ WIRING DIAGRAMS
Sample/wiring diagram -example-
INFOID:0000000001539191
• For detail, refer to following GI-11, "Description".
JCAWA0005GB
Revision: March 2010 2008 QX56

HOW TO READ WIRING DIAGRAMSGI-11
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DescriptionINFOID:0000000001539192
SWITCH POSITIONS
Switches are shown in wiring diagrams as if the vehicle is in the “normal” condition.
A vehicle is in the “normal” condition when:
Number Item Description
1 Power supply • This means the power supply of fusible link or fuse.
2 Fusible link • “X” means the fusible link.
3 Number of fusible link/
fuse • This means the number of fusible link or fuse location.
4 Fuse • “/” means the fuse.
5 Current rating of fus-
ible link/fuse • This means the current rating of the fusible link or fuse.
6 Optional splice • The open circle shows that the splice is optional depending on vehicle application.
7 Connector number • The letter shows which harness the connector is located in.
• Example “M”: main harness. For detail and to locate the connector, refer to
PG-62, "
Elec-
trical Units Location", PG-40, "Harness Layout".
8Splice • The shaded circle “ ” means the splice.
9 Page crossing • This circuit continues to an adjacent page.
10 Option abbreviation • This means the vehicle specifications which layouts the circuit between “ ”.
11 Relay • This shows an internal representation of the relay.
12 Option description • This shows a description of the option abbreviation used on the page.
13 Switch • This shows that continuity exists between terminals 1 and 2 when the switch is in the A
position. Continuity exists between terminals 1 and 3 when the switch is in the B position.
14 Circuit (Wiring) • This means the wiring.
15 System branch • This shows that the circuit is branched to other systems.
16 Shielded line • The line enclosed by broken line circle shows shield wire.
17 Component name • This shows the name of a component.
18 Ground (GND) • This shows the ground connection.
19 Connector • This means the connector information.
• This unit-side is described by the connector symbols.
20 Connectors • This means that a transmission line bypasses two connectors or more.
21 Wire color • This shows a code for the color of the wire.
B = Black
W = White
R = Red
G = Green
L = Blue
Y = Yellow
LG = Light Green BR = Brown
OR or O = Orange
P = Pink
PU or V (Violet) = Purple
GY or GR = Gray
SB = Sky Blue
CH = Dark Brown
DG = Dark Green
• When the wire color is striped, the base color is given first, followed by the stripe color as shown below:
Example: L/W = Blue with White Stripe
22 Terminal number • This means the terminal number of a connector.
Revision: March 2010 2008 QX56

GI-12
< HOW TO USE THIS MANUAL >
HOW TO READ WIRING DIAGRAMS
• ignition switch is “OFF”,
• doors, hood and trunk lid/back door are closed,
• pedals are not depressed, and
• parking brake is released.
MULTIPLE SWITCH
The continuity of multiple switch is described in two ways as shown below.
• The switch chart is used in schematic diagrams.
• The switch diagram is used in wiring diagrams.
SGI860
JSAIA0017GB
Revision: March 20102008 QX56

SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-39
< BASIC INSPECTION >
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lowing section illustrates ways to simulate the c onditions/environment under which the owner experiences an
electrical incident.
The section is broken into the six following topics:• Vehicle vibration
• Heat sensitive
• Freezing
• Water intrusion
• Electrical load
• Cold or hot start up
Get a thorough description of the incident from the customer . It is important for simulating the conditions of the
problem.
VEHICLE VIBRATION
The problem may occur or become worse while driving on a rough road or when engine is vibrating (idle with
A/C on). In such a case, you will want to check for a vibration related condition. Refer to the following illustra-
tion.
Connector & Harness
Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently
shake each connector and harness while monitoring the syst em for the incident you are trying to duplicate.
This test may indicate a loose or poor electrical connection.
Hint
Connectors can be exposed to moisture. It is possible to get a thin film of corrosion on the connector termi-
nals. A visual inspection may not reveal this without disconnecting the connector. If the problem occurs inter-
mittently, perhaps the problem is caused by corrosi on. It is a good idea to disconnect, inspect and clean the
terminals on related connectors in the system.
Sensor & Relay
Gently apply a slight vibration to sensors and relays in the system you are inspecting.
This test may indicate a loose or poorly mounted sensor or relay.
Engine Compartment
There are several reasons a vehicle or engine vibration could cause an electrical complaint. Some of the
things to check for are:
• Connectors not fully seated.
• Wiring harness not long enough and is being stressed due to engine vibrations or rocking.
• Wires laying across brackets or moving components.
• Loose, dirty or corroded ground wires.
• Wires routed too close to hot components.
To inspect components under the hood, start by verifyi ng the integrity of ground connections. (Refer to Ground
Inspection described later.) First check that the system is properly grounded. Then check for loose connection
by gently shaking the wiring or components as previous ly explained. Using the wiring diagrams inspect the
wiring for continuity.
Behind the Instrument Panel
An improperly routed or improperly clamped harness can become pinched during accessory installation. Vehi-
cle vibration can aggravate a harness which is routed along a bracket or near a screw.
Under Seating Areas
SGI839
Revision: March 2010 2008 QX56

CONSULT-III CHECKING SYSTEMGI-47
< BASIC INSPECTION >
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x : Applicable
*1: With intelligent cruise control
*2: With 4-wheel drive
*3: With security card installed
CONSULT-III Data Link Connector (DLC) CircuitINFOID:0000000001555031
INSPECTION PROCEDURE
If the CONSULT-III cannot diagnose the sys tem properly, check the following items.
NOTE:
The CAN and DDL2 circuits from DLC pins 6, 7 and 14 may be connected to more than one system. A short in
any circuit connected to a control unit in one system may affect CONSULT-III access to other systems.
Passenger AirbagDisplays the STATUS (readiness) of the front passen-
ger air bag. ----x-----------
AV COMM monitor The condition of AV communication can be indicated.------------x---
Configuration Sets control module parame
ters to match vehicle op-
tions. ------x---------
PIN read
*3This mode shows the BCM-specific 5-digit code. ------x---------
Control unit initial-
ization
*3All registered ignition key IDs in NATS components
can be initialized and new IDs can be registered. ------x---------
Diagnostic test
mode Function
ENGINE
TRANSMISSION
ICC
*1
ABS
AIR BAG
IPDM E/R BCM
METER/M&A
INTELLIGENT KEY
AUTO DRIVE POS.
REARVIEW CAMERA AIR LEVELIZER MULTI AV
ALL MODE AWD/4WD
*2
HVAC
SONAR
Symptom Check item
CONSULT-III cannot access
any system. • CONSULT-III DLC power supply circuit (Terminal 8) and ground circuit (Terminal 4)
CONSULT-III cannot access in-
dividual system. (Other sys-
tems can be accessed.) • Power supply and ground circuit for the control unit of the system (For detailed circuit, refer to wiring
diagram for each system.)
• Open or short circuit between the system and CONSULT-III DLC (For detailed circuit, refer to wiring diagram for each system.)
• Open or short circuit CAN communication line. Refer to LAN-14, "
Trouble Diagnosis Flow Chart".
Revision: March 2010 2008 QX56

GI-48
< BASIC INSPECTION >
CONSULT-III CHECKING SYSTEM
Wiring Diagram
INFOID:0000000001539231
AAAWA0005GB
Revision: March 2010 2008 QX56