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2003 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX
WIRING SYSTEM SECTION
WIRING SYSTEM WI
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.
FUJI HEAVY INDUSTRIES LTD. G8070GE7
WIRING SYSTEM
WI
Page
1. Basic Diagnostics Procedure ......................................................................3
2. Working Precautions .................................................................................12
3. Power Supply Routing...............................................................................13
4. Ground Distribution ...................................................................................27
5. Airbag System...........................................................................................48
6. Air Conditioning System............................................................................54
7. Anti-lock Brake System .............................................................................66
8. A/T Control System ...................................................................................73
9. Audio System ............................................................................................93
10. Back-up Light System ...............................................................................97
11. Charging System.......................................................................................98
12. Clearance Light and Illumination Light System .........................................99
13. Combination Meter..................................................................................108
14. Cruise Control System ............................................................................112
15. Door Lock System...................................................................................118
16. Engine Electrical System ........................................................................120
17. Front Accessory Power Supply System ..................................................160
18. Front Fog Light System...........................................................................161
19. Fuel Gauge System ................................................................................163
20. Full-Time Dual-Range System ................................................................165
21. Headlight Beam Leveler System.............................................................167
22. Headlight System ....................................................................................168
23. Headlight Washer System.......................................................................170
24. Horn System ...........................................................................................171
25. Immobilizer System.................................................................................172
26. In Compartment Light System.................................................................176
27. Keyless Entry System .............................................................................180
28. Oil Pressure and Temperature Gauge System .......................................189
29. Outside Temperature Display System ....................................................191
30. Parking Brake and Brake Fluid Level Warning System ..........................193
31. Power Window System ...........................................................................195
32. Radiator Fan System ..............................................................................203
33. Rear Accessory Power Supply System...................................................204
34. Rear Differential Oil Temperature Warning System................................205
35. Rear Fog Light System ...........................................................................206
36. Rear Window Defogger System..............................................................208
37. Remote Controlled Rearview Mirror System...........................................210
38. Seat Belt Warning System ......................................................................212
39. Seat Heater System ................................................................................214
40. Security System ......................................................................................216
41. Starter System ........................................................................................218
42. Stop Light System ...................................................................................220
43. Sunroof System.......................................................................................221
WIRING SYSTEM
44. Turn Signal Light and Hazard Light System............................................222
45. Wiper and Washer System (Front)..........................................................226
46. Wiper and Washer System (Rear) ..........................................................227
47. Wiper Deicer System ..............................................................................228
48. Harness Components Location...............................................................229
49. Front Wiring Harness ..............................................................................231
50. Bulkhead Wiring Harness (In Engine Room) ..........................................235
51. Bulkhead Wiring Harness (In Compartment) ..........................................243
52. Engine Wiring Harness and Transmission Cord .....................................251
53. Instrument Panel Wiring Harness ...........................................................255
54. Rear Wiring Harness, Bulkhead Wiring Harness, Roof Cord and Fuel Tank Cord ....259
55. Door Cord................................................................................................265
56. Rear Wiring Harness and Rear Gate Cord .............................................269
WI-2
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM
1. Basic Diagnostics Procedure 4) With test set-up held as it is, turn switch ON. The
voltmeter will indicate a voltage and, at the same
A: BASIC PROCEDURES time, the light will come on.
5) The circuit is in good order. If a problem such as
1. GENERAL a lamp failing to light occurs, use the procedures
The most important purpose of diagnostics is to de- outlined above to track down the malfunction.
termine which part is malfunctioning quickly, to
save time and labor. 2. CIRCUIT CONTINUITY CHECKS
1) Disconnect the battery terminal or connector so
2. IDENTIFICATION OF TROUBLE SYMP- there is no voltage between the check points.
TOM Contact the two leads of an ohmmeter to each of
Determine what the problem is based on the symp- the check points.
tom. If the circuit has diodes, reverse the two leads and
check again.
3. PROBABLE CAUSE OF TROUBLE 2) Use an ohmmeter to check for diode continuity.
Look at the wiring diagram and check the system's When contacting the negative lead to the diode
circuit. Then check the switch, relay, fuse, ground, positive side and the positive lead to the negative
etc. side, there should be continuity.
When contacting the two leads in reverse, there
4. LOCATION AND REPAIR OF TROUBLE should be no continuity.
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.
5. CONFIRMATION OF SYSTEM OPERA-
TION Continuity No continuity
After repairing, ensure that the system operates WI-00095
properly. 3) Symbol "--" indicates that continuity exists
B: BASIC INSPECTION between two points or terminals. For example,
when a switch position is "3", continuity exists
1. VOLTAGE MEASUREMENT among terminals 1, 3 and 6, as shown in table be-
1) Using a voltmeter, connect the negative lead to a low.
good ground point or negative battery terminal and
the positive lead to the connector or component ter- Terminal
1 2 3 4 5 6
minal. Switch Position
2) Contact the positive probe of the voltmeter on OFF
connector (A). 1
The voltmeter will indicate a voltage.
2
3) Shift the positive probe to connector (B). The
voltmeter will indicate no voltage. 3
4
To power FUSE Switch Light
supply WI-00096
(A) (B)
V
WI-00094
WI-3
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM
3. HOW TO DETERMINE AN OPEN CIR- 4. HOW TO DETERMINE A SHORT CIR-
CUIT CUIT
1) Voltmeter Method: 1) Test lamp method:
An open circuit is determined by measuring the Connect a test lamp (rated at approximately 3
voltage between respective connectors and ground watts) in place of the blown fuse and allow current
using a voltmeter, starting with the connector clos- to flow through the circuit. Disconnect one connec-
est to the power supply. The power supply must be tor at a time from the circuit, starting with the one lo-
turned ON so that current flows in the circuit. If volt- cated farthest from the power supply. If the test
age is not present between a particular connector lamp goes out when a connector is disconnected,
and ground, the circuit between that connector and the wiring between that connection and the next
the previous connector is open. connector (farther from the power supply) is short-
ed.
Open circuit or wiring
Test lamp
Shorted wiring
V V
No voltage is present Fuse holder
Voltage is present
WI-00097
WI-00099
2) Ohmmeter method:
Disconnect all connectors affected, and check con- 2) Ohmmeter method:
tinuity in the wiring between adjacent connectors. Disconnect all affected connectors, and check
When the ohmmeter indicates "infinite", the wiring continuity between each connector and ground.
is open. When ohmmeter indicates continuity between a
particular connector and ground, that connector is
shorted.
Open circuit
Shorted connector
Continuity exists. Continuity does not exist.
WI-00098 Continuity exists.
Continuity does not exist.
WI-00100
WI-4
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 the elec-
tric current flows from the battery.
Sketches and codes are used in the diagrams. They should read as follows:
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