Page 2553 of 3051
Number Item Description
,“Main
Descriptio n(Cont ’d)
Page 2554 of 3051
SGI364
CONNECTOR SYMBOLS=NLGI0003S0201Most 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 connec-
tor. For description and how to disconnect, refer to EL-5,“HAR-
NESS CONNECTOR”.
SGI363
+Male and female terminals
Connector guides for male terminals are shown in black and
female terminals in white in wiring diagrams.
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-15
Page 2555 of 3051
AGI070
HARNESS INDICATIONNLGI0003S0202+Letter designations next to test meter probe indicate harness
(connector) wire color.
+Connector numbers in a single circle M33 indicate harness
connectors.
COMPONENT INDICATIONNLGI0003S0203+Connector numbers in a double circle F211 indicate compo-
nent connectors.
SGI860
SWITCH POSITIONSNLGI0003S0204Switches are shown in wiring diagrams as if the vehicle is in the
“normal”condition.
A vehicle is in the“normal”condition when:
+ignition switch is“OFF”,
+doors, hood and trunk lid/back door are closed,
+pedals are not depressed, and
+parking brake is released.
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-16
Page 2556 of 3051
SGI862-A
DETECTABLE LINES AND NON-DETECTABLE LINESNLGI0003S0205In some wiring diagrams, two kinds of lines, representing wires,
with different weight are used.
+A line with regular weight (wider line) represents a“detectable
line for DTC (Diagnostic Trouble Code)”.A“detectable line for
DTC”is a circuit in which ECM can detect its malfunctions with
the on board diagnostic system.
+A line with less weight (thinner line) represents a“non-detect-
able line for DTC”.A“non-detectable line for DTC”is a circuit
in which ECM cannot detect its malfunctions with the on board
diagnostic system.
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-17
Page 2557 of 3051
MULTIPLE SWITCH=NLGI0003S0206The 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.
SGI875
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-18
Page 2558 of 3051
REFERENCE AREA=NLGI0003S0207The Reference Area of the wiring diagram contains references to
additional electrical reference pages at the end of the manual. If
connector numbers and titles are shown in the Reference Area of
the wiring diagram, these connector symbols are not shown in the
Connector Area.
SGI092A
Super multiple junction (SMJ)
In a wiring diagram, the SMJ connectors include a letter of the
alphabet in the terminal number.
SMJ connector numbers are shown in the Reference Area of the
wiring diagram. SMJ terminal arrangement can be found on the
electrical reference pages at the end of the manual. For terminal
arrangement of these connectors, refer to the“SUPER MULTIPLE
JUNCTION (SMJ)”electrical reference page at the end of the
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-19
Page 2559 of 3051

manual.
Fuse block—Junction box (J/B)
Fuse block—Junction box (J/B) connector number is shown in the
Reference Area of the wiring diagram. For connector terminal and
fuse arrangement, refer to the“FUSE BLOCK—Junction Box
(J/B)”electrical reference page at the end of the manual.
Fuse and fusible link box
For fuse arrangement in the fuse and fusible link box, refer to the
“FUSE AND FUSIBLE LINK BOX”electrical reference page at the
end of the manual.
Electrical units
Electrical unit connector symbols are shown in the Connector Area
of the wiring diagram.
However, when there is not enough space to show the connector
terminal arrangement in the Connector Area of the wiring diagram,
the electrical unit connector number is shown in the Reference
Area of the wiring diagram. For electrical unit connector terminal
arrangement, refer to the“ELECTRICAL UNITS”electrical refer-
ence page at the end of the manual. Most of the electrical unit
connectors on this page are shown from the harness side of the
connector.
Joint connector
Joint connector symbols are shown in the connector area of the
wiring diagram. For connector internal wiring layout and joint con-
nector terminal arrangement, refer to the“JOINT CONNECTOR
(J/C)”electrical reference page at the end of the manual.
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-20
Page 2560 of 3051

NLGI0005
Work FlowNLGI0005S01
SGI838
STEP DESCRIPTION
STEP 1 Get detailed information about the conditions and the environment when the incident occurred.
The following are key pieces of information required to make a good analysis:
WHATVehicle Model, Engine, Transmission and the System (i.e. Radio).
WHENDate, Time of Day, Weather Conditions, Frequency.
WHERERoad Conditions, Altitude and Traffic Situation.
HOWSystem Symptoms, Operating Conditions (Other Components Interaction).
Service History and if any After Market Accessories have been installed.
STEP 2 Operate the system, road test if necessary.
Verify the parameter of the incident.
If the problem can not be duplicated, refer to“Incident Simulation Tests”next page.
STEP 3 Get the proper diagnoses materials together including:
POWER SUPPLY ROUTING
System Operation Descriptions
Applicable Service Manual Sections
Check for any Service Bulletin.
Identify where to begin diagnoses based upon your knowledge of the system operation and the cus-
tomer comments.
STEP 4 Inspect the system for mechanical binding, loose connectors or wiring damage.
Determine which circuits and components are involved and diagnose using the Power Supply Routing
and Harness Layouts.
STEP 5 Repair or replace the incident circuit or component.
STEP 6 Operate the system in all modes. Verify the system works properly under all conditions. Make sure you
have not inadvertently created a new incident during your diagnoses or repair steps.
HOW TO PERFORM EFFICIENT DIAGNOSES FOR AN ELECTRICAL INCIDENT
Work Flow
GI-21