Subaru Legacy (2005 year). Service manual — part 1052

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 problem is encountered, check the com-
ponent parts.

5. SYSTEM OPERATION CHECK

After repairing, ensure that the system operates
properly.

B: BASIC 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 ter-
minal.
2) Contact the positive lead of the voltmeter on
connector (A). The voltmeter will indicate a voltage.
3) Shift the positive lead to connector (B). The volt-
meter will indicate no voltage.

4) With the test set-up held as it is, turn the switch
ON. The voltmeter will indicate a voltage and, at the
same time, the light will come on.

5) The circuit is in good order. If a problem such as
a light failing to illuminate occurs, use the proce-
dures outlined above to track down the malfunc-
tion.

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 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 “

❍ — ❍” indicates that continuity exists

between two points or terminals. For example,
when a switch position is at “3”, continuity exists
among terminals 1, 3 and 6, as shown in the table
below.

WI-02739

To power

FUSE

supply

Switch

Light

(A)

(B)

WI-02740

Continuity

No continuity

WI-02741

Terminal

Switch Position

OFF

WI-4

WIRING SYSTEM

Basic Diagnostic Procedure

3. HOW TO DETERMINE AN OPEN CIR-
CUIT

1) WITH VOLTMETER:
An open circuit is determined by measuring the
voltage between respective connectors and ground
using a voltmeter, starting with the connector clos-
est to the power supply. The power supply must be
turned ON so that current flows in the circuit. If volt-
age is not present between a particular connector
and ground, the circuit between that connector and
the previous connector is open.

2) WITH OHMMETER:
Disconnect all connectors affected, and check con-
tinuity in the wiring between adjacent connectors.
When the ohmmeter indicates “infinite”, the wiring
is open.

4. HOW TO DETERMINE A SHORT CIR-
CUIT

1) WITH TEST LIGHT:
Connect a test light (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 the power supply. If the test light goes
out when a connector is disconnected, the wiring

between that connector and the next connector
(farther from the power supply) is shorted.

2) WITH OHMMETER:
Disconnect all affected connectors, and check con-
tinuity between each connector and ground. When
the ohmmeter indicates continuity between a par-
ticular connector and a ground, that connector is
shorted.

C: HOW TO READ WIRING DIA-

GRAMS

1. WIRING DIAGRAM

The wiring diagram of each system is illustrated so
that you can understand the path through which the
electric current flows from the battery.
Sketches and codes are used in the diagrams.
They should read as follows:
• Each connector and its terminal position are indi-
cated by a sketch of the connector in a disconnect-
ed state which is viewed from the front.

WI-02742

Open circuit or wiring

No voltage is present

Voltage is present

WI-02743

Open circuit

Continuity does not exist.

Continuity exists.

WI-02744

Shorted wiring

Test lamp

Fuse holder

WI-02745

Shorted connector

Continuity does not exist.

Continuity exists.

WI-02746

Viewed from this direction

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Subaru Legacy (2005 year). Service manual — part 1052

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