Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 6 - Wiring System Basic Diagnostics Procedure

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BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM

1. Basic Diagnostics Procedure B: BASIC INSPECTION
A: BASIC PROCEDURES 1. VOLTAGE MEASUREMENT
1. GENERAL 1) Using a voltmeter, connect the negative lead to a
good ground point or negative battery terminal and
The most important purpose of diagnostics is to de- the positive lead to the connector or component ter-
termine which part is malfunctioning quickly, to minal.
save time and labor. 2) Contact the positive probe of the voltmeter on
2. IDENTIFICATION OF TROUBLE SYMP- connector (A).
TOM The voltmeter will indicate a voltage.
3) Shift the positive probe to connector (B). The
Determine what the problem is based on symptom. voltmeter will indicate no voltage.
3. PROBABLE CAUSE OF TROUBLE To power FUSE Switch Light
Look at the wiring diagram and check system's cir- supply
cuit. Then check the switch, relay, fuse, ground,
etc.
(A) (B)
4. LOCATION AND REPAIR OF TROUBLE
1) Using the diagnostics narrow down the causes.
V
2) If necessary, use a voltmeter, ohmmeter, etc.
3) Before replacing certain component parts
(switch, relay, etc.), check the power supply, WI-00094
ground, for open wiring harness, poor connectors, 4) With test set-up held as it is, turn the switch ON.
etc. If no problems are encountered, check the The voltmeter will indicate a voltage and, at the
component parts. same time, the light will come on.
5. CONFIRMATION OF SYSTEM OPERA- 5) The circuit is in good order. If a problem such as
TION a lamp failing to light occurs, use the procedures
outlined above to track down malfunction.
After repairing, ensure that the system operates
properly.

WI-3
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM

2. CIRCUIT CONTINUITY CHECKS 3. HOW TO DETERMINE AN OPEN CIR-
1) Disconnect the battery cable or connector so CUIT
there is no voltage between check points. 1) Voltmeter Method:
Contact the two leads of an ohmmeter to each of An open circuit is determined by measuring the
the check points. voltage between respective connectors and ground
If the circuit has diodes, reverse the two leads and using a voltmeter, starting with the connector clos-
check again. est to power supply. The power supply must be
2) Use an ohmmeter to check for the diode continu- turned ON so that current flows in the circuit. If volt-
ity. When contacting the negative lead to diode age is not present between a particular connector
positive side and positive lead to negative side, and ground, the circuit between that connector and
there should be continuity. previous connector is open.
When contacting the two leads in reverse, there
should be no continuity. Open circuit or wiring

V V
No voltage is present

Voltage is present
WI-00097
Continuity No continuity
2) Ohmmeter method:
WI-00095
Disconnect all connectors affected, and check the
3) Symbol " -- " indicates that continuity exists continuity in wiring between adjacent connectors.
between two points or terminals. For example, When the ohmmeter indicates "infinite", the wiring
when a switch position is "3", continuity exists is open.
among terminals 1, 3 and 6, as shown in table be-
low. Open circuit

Terminal
1 2 3 4 5 6
Switch Position

OFF

2
Continuity exists. Continuity does not exist.
3
WI-00098
4

WI-00096

WI-4
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM

4. HOW TO DETERMINE A SHORT CIR-
CUIT
1) Test lamp method:
Connect a test lamp (rated at approx. 3 watts) in
place of the blown fuse and allow current to flow
through the circuit. Disconnect one connector at a
time from the circuit, starting with the one located
farthest from power supply. If the test lamp goes
out when a connector is disconnected, the wiring
between that connection and next connector (far-
ther from the power supply) is shorted.

Test lamp

Shorted wiring

Fuse holder

WI-00099

2) Ohmmeter method:
Disconnect all affected connectors, and check the
continuity between each connector and ground.
When the ohmmeter indicates continuity between a
particular connector and ground, that the connector
is shorted.

Shorted connector

Continuity exists.
Continuity does not exist.
WI-00100

WI-5
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM

C: HOW TO READ WIRING DIAGRAMS
1. WIRING DIAGRAM
The wiring diagram of each system is illustrated so that you can understand the path through which electric
current flows from battery.
Sketches and codes are used in the diagrams. They should read as follows:

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