Subaru Legacy (2005 year). Manual — part 1052
WIRING SYSTEM
WI
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . . 3
Working Precautions . . . . . . . . . . . . . . . . . . . . .14
Power Supply Circuit. . . . . . . . . . . . . . . . . . . . .15
Ground Circuit . . . . . . . . . . . . . . . . . . . . . . ...29
Engine Electrical System . . . . . . . . . . . . . . . . . . ..50
AT Control System . . . . . . . . . . . . . . . . . . . . ..140
AT Shift Lock Control System . . . . . . . . . . . . . . . . .178
Anti-lock Brake System . . . . . . . . . . . . . . . . . . ...179
Vehicle Dynamics Control System . . . . . . . . . . . . . . ..183
Air Conditioning System. . . . . . . . . . . . . . . . . . ..189
Airbag System. . . . . . . . . . . . . . . . . . . . . . .203
Immobilizer System. . . . . . . . . . . . . . . . . . . . .211
Cruise Control System . . . . . . . . . . . . . . . . . . . 213
CAN Communication System. . . . . . . . . . . . . . . . ..228
Radiator Fan System . . . . . . . . . . . . . . . . . . . ..232
Charging System. . . . . . . . . . . . . . . . . . . . . .234
Starter System . . . . . . . . . . . . . . . . . . . . . . 235
Power Seat System. . . . . . . . . . . . . . . . . . . . .239
Seat Belt Warning System . . . . . . . . . . . . . . . . . ..240
Seat Heater System . . . . . . . . . . . . . . . . . . . . 242
Headlight System . . . . . . . . . . . . . . . . . . . . . 244
Headlight Beam Leveler System. . . . . . . . . . . . . . . .246
Front Fog Light System. . . . . . . . . . . . . . . . . . ...248
Rear Fog Light System . . . . . . . . . . . . . . . . . . ...250
Back-up Light System . . . . . . . . . . . . . . . . . . . .252
Stop Light System . . . . . . . . . . . . . . . . . . . . ...254
Clearance Light and Illumination Light System . . . . . . . . . ...255
Turn Signal Light and Hazard Light System. . . . . . . . . . . 263
Interior Light System . . . . . . . . . . . . . . . . . . . ...267
Front Wiper and Washer System . . . . . . . . . . . . . . . 275
Rear Wiper and Washer System. . . . . . . . . . . . . . . .277
Wiper Deicer System . . . . . . . . . . . . . . . . . . . ..279
Audio System . . . . . . . . . . . . . . . . . . . . . . ..280
Front Accessory Power Supply Socket System . . . . . . . . . ..288
Rear Accessory Power Supply Socket System. . . . . . . . . ...289
Navigation System . . . . . . . . . . . . . . . . . . . . ..290
Horn System . . . . . . . . . . . . . . . . . . . . . . ...294
Power Window System . . . . . . . . . . . . . . . . . . ...295
Rear Defogger System. . . . . . . . . . . . . . . . . . . 303
Remote Control Mirror System. . . . . . . . . . . . . . . . 305
Combination Meter System. . . . . . . . . . . . . . . . . .307
Clock System . . . . . . . . . . . . . . . . . . . . . . ..311
Fuel Gauge System . . . . . . . . . . . . . . . . . . . . 312
WI-2
WIRING SYSTEM
Coolant Temperature System . . . . . . . . . . . . . . . . .313
Oil Pressure Warning Light System . . . . . . . . . . . . . . 314
Parking Brake / Brake Fluid Level Warning Light System. . . . . ...315
Sunroof Control System . . . . . . . . . . . . . . . . . . ..317
Keyless Entry System . . . . . . . . . . . . . . . . . . . .319
Security System . . . . . . . . . . . . . . . . . . . . . ..328
Full Time Dual-range System. . . . . . . . . . . . . . . . ..331
Alarm Control System . . . . . . . . . . . . . . . . . . . .333
Harness Components Location. . . . . . . . . . . . . . . ...336
Front Wiring Harness . . . . . . . . . . . . . . . . . . . ..340
Bulkhead Wiring Harness (In Engine Compartment) . . . . . . . ..342
Bulkhead Wiring Harness (In Compartment) . . . . . . . . . . ..348
Engine Wiring Harness and Transmission Cord . . . . . . . . . .354
Instrument Panel Wiring Harness . . . . . . . . . . . . . . ...362
Rear Wiring Harness. . . . . . . . . . . . . . . . . . . ...366
Door Cord. . . . . . . . . . . . . . . . . . . . . . . . 372
Rear Wiring Harness and Trunk Lid Cord . . . . . . . . . . . ...376
Rear Wiring Harness and Rear Gate Cord . . . . . . . . . . . .378
Harness Repair Kit . . . . . . . . . . . . . . . . . . . . ..380
WI-3
WIRING SYSTEM
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: BASIC PROCEDURES
1. GENERAL DESCRIPTION
The most important purpose of diagnostics is to de-
termine which part is malfunctioning quickly, to
save time and labor.
2. IDENTIFICATION OF TROUBLE SYMP-
TOM
Determine what the problem is based on the symp-
tom.
3. PROBABLE CAUSE OF TROUBLE
Look at the wiring diagram and check the system’s
circuit. Then check the switch, relay, fuse, ground,
etc.
4. 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 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
V
(A)
(B)
WI-02740
Continuity
No continuity
WI-02741
Terminal
Switch Position
OFF
1
2
3
4
1
2
3
4
5
6
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
V
V
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
4
2
4
1
3
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