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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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