Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1996 1996 Service Manual WIRING DIAGRAM SECTION WIRING DIAGRAM MSA5TCD96L6475

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6-3 WIRING DIAGRAM
2. Basic Diagnostics Procedures

2. Basic Diagnostics Procedures
The most important purpose of diagnostics is to determine
which part is malfunctioning quickly, to save time and labor.
A: IDENTIFICATION OF TROUBLE SYMPTOM
Determine what the problem is based on the symptom.

B: PROBABLE CAUSE OF TROUBLE
Look at the wiring diagram and check the system's circuit.
Then check the switch, relay, fuse, ground, etc.

C: LOCATION AND REPAIR OF TROUBLE
1) Using the diagnostics narrow down the causes.
2) If necessary, use a voltmeter, ohmmeter, etc.
3) Before replacing certain component parts (switch, relay,
etc.), check the power supply, ground, for open wiring
harness, poor connectors, etc. If no problems are
encountered, check the component parts.

D: CONFIRMATION OF SYSTEM OPERATION
After repairing, ensure that the system operates properly.

E: INSPECTION
1. VOLTAGE MEASUREMENT
1) Using a voltmeter, connect the negative lead to a good
ground point or negative battery terminal and the positive
lead to the connector or component terminal.
2) Contact the positive probe of the voltmeter on connec-
tor (A).
The voltmeter will indicate a voltage.
3) Shift the positive probe to connector (B). The voltmeter
G6M0206
will indicate no voltage.
With test set-up held as it is, turn switch ON. The voltme-
ter will indicate a voltage and, at the same time, the light
will come on.
4) The circuit is in good order. If a problem such as a lamp
failing to light occurs, use the procedures outlined above to
track down the malfunction.

8
WIRING DIAGRAM 6-3
2. Basic Diagnostics Procedures

2. CIRCUIT CONTINUITY CHECKS
1) Disconnect the battery terminal or connector so there is
no voltage between the check points.
Contact the two leads of an ohmmeter to each of the check
points.
If the circuit has diodes, reverse the two leads and check
again.
2) Use an ohmmeter to check for diode continuity.
When contacting the negative lead to the diode positive
G6M0207 side and the positive lead to the negative side, there should
be continuity.
When contacting the two leads in reverse, there should be
no continuity.

3) Symbol "o--o" indicates that continuity exists between
two points or terminals. For example, when a switch posi-
tion is "3", continuity exists among terminals 1, 3 and 6, as
shown in table below.
Terminal
1 2 3 4 5 6
Switch Position
OFF
1 k k k
2 k k k
3 k k k
4 k k k

9
6-3 WIRING DIAGRAM
2. Basic Diagnostics Procedures

3. HOW TO DETERMINE AN OPEN CIRCUIT
1) Voltmeter method
An open circuit is determined by measuring the voltage
between respective connectors and ground using a
voltmeter, starting with the connector closest to the power
supply. The power supply must be turned ON so that cur-
rent flows in the circuit. If voltage is not present between a
particular connector and ground, the circuit between that
connector and the previous connector is open.
G6M0208

2) Ohmmeter method
Disconnect all connectors affected, and check continuity in
the wiring between adjacent connectors. When the ohm-
meter indicates "infinite", the wiring is open.

G6M0209

4. HOW TO DETERMINE A SHORT-CIRCUIT
1) Test lamp method
Connect a test lamp (rated at approximately 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 the power
supply. If the test lamp goes out when a connector is
disconnected, the wiring between that connection and the
next connector (farther from the power supply) is shorted.
G6M0210

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

G6M0211

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