Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2002 7 - Wiring
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2002 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX
WIRING SYSTEM SECTION
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. G1830BE7
WIRING SYSTEM
WI.
Page
1. Basic Diagnostics Procedure ...................................................................... 3
2. Working Precautions ................................................................................. 12
3. Super Multiple Junction (SMJ) .................................................................. 13
4. Power Supply Routing............................................................................... 15
5. Ground Distribution ................................................................................... 22
6. Airbag System ........................................................................................... 31
7. Air Conditioning System ............................................................................ 34
8. Anti-lock Brake System ............................................................................. 36
9. A/TControl System ................................................................................... 39
10. A/T Shift Lock Control System .................................................................. 50
11. Audio System ............................................................................................ 52
12. Charging System ....................................................................................... 54
13. Clock System ............................................................................................ 55
14. Combination Meter .................................................................................... 56
15. Compass Mirror System ............................................................................ 60
16. Cruise Control System .............................................................................. 61
17. Door Lock System ..................................................................................... 64
18. Engine Coolant Temperature Gauge System ........................................... 65
19. Engine Electrical System .......................................................................... 66
20 . Fuel Gauge System .................................................................................. 87
21 . Front Accessory Power Supply System .................................................... 88
22 . Horn System ............................................................................................. 89
23 . Keyless Entry System ............................................................................... 90
24. Back-up Light System ............................................................................... 93
25 . Clearance Light and Illumination Light System ......................................... 94
26 . Front Fog Light System ............................................................................. 97
27. Headlight System ...................................................................................... 98
28 . In Compartment Light System ................................................................. 101
29 . Stop Light System ................................................................................... 103
30. Turn Signal Light and Hazard Light System ............................................ 104
31 . Oil Pressure Warning Light System ........................................................ 106
32 . Outside Temperature Display System .................................................... 107
33. Parking Brake and Brake Fluid Level Warning System .......................... 108
34. Power Window System ........................................................................... 109
35 . Radiator Fan System .............................................................................. 113
36. Rear Accessory Power Supply System ................................................... 116
37 . Rear Window Defogger System .............................................................. 117
38 . Remote Controlled Rearview Mirror System ........................................... 118
39 . Seat Belt Warning and Key Warning System .......................................... 119
40 . Seat Heater System ................................................................................ 120
41 . Security System ...................................................................................... 121
42 . Starter System ........................................................................................ 124
43 . Wiper and Washer System (Front) .......................................................... 127
WIRING SYSTEM
44 . Wiper and Washer System (Rear) .......................................................... 128
45 . Overall Systems ...................................................................................... 129
46 . Front Wiring Harness .............................................................................. 130
47 . Bulkhead Wiring Harness (In Engine Room) .......................................... 132
40 . Bulkhead Wiring Harness (In Compartment) .......................................... 136
49 . Engine Wiring Harness and Transmission Cord ..................................... 139
50. Instrument Panel Wiring Harness ........................................................... 143
51 . Rear Wiring Harness, Bulkhead wiring Harness, Roof Cord and Fuel Tank Cord .....144
52. Door Cord................................................................................................ 146
53. Rear Wiring Harness and Trunk Lid Cord ............................................... 148
54. Rear Wiring Harness and Rear Gate Cord ............................................. 150
WI-2
BASIC DIAGNOSTICS PROCEDURE
m
WIRING SYSTEM
1. Basic Diagnostics Procedure 4) With the test set-up held as it is, turn the switch
ON. The voltmeter will indicate a voltage and, at the
A: BASIC PROCEDURES same 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 2. CIRCUIT CONTINUITY CHECKS
save time and labor.
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 G6M0207
properly. 3) Symbol " - "
0 0indicates that continuity exists
B: BASIC INSPECTION between two points or terminals. For example,
when a switch position is at "3",continuity exists
1. VOLTAGE MEASUREMENT among terminals 1, 3 and 6, as shown in the table
below.
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-
1 2 3 4 5 6
minal. Switch Position
2) Contact the positive probe of the voltmeter on
connector (A).
The voltmeter will indicate a voltage.
3) Shift the positive probe to connector (6). The
voltmeter will indicate no voltage.
Switch Light
B6M0749
H6M051OA
WI-3
I
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.
Test lamp
NO voltage is present
- - -
- -
Voltage is present
G6M0208
-&
G6M0210
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 con-
When the ohmmeter indicates "infinite", the wiring tinuity between each connector and ground. When
is open. the ohmmeter indicates continuity between a par-
ticular connector and ground, that connector is
Open circuit shorted.
7\
,- Shorted connector
Continuity exists.
1 I
Continuity does not exist.
G6M0209
pl qq
-
Continuity exists.
t- Continuity does not exist. .-
I
G6M0211
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:
Each connector and its terminal position are indicated by a sketch of the connector in a disconnected state
which is viewed from the front.
Viewed from this direction
G6M019:
The number of poles or pins, presence of a lock, and pin number of each terminal are indicated in the
sketch of each connector. In the sketch, the highest pole number refers to the number of poles which the con-
nector has. For example, the sketch of the connector shown in figure indicates the connector has 9 poles.
Connector shown in wiring diagram
Connector used in vehicle
Sketch Symbol Number of poles
Double frames
Numbered in order from upper
right to lower left.
Indicates the number of poles.
G6M0194 G6M0196
Indicates a lock is included.
\
Numbered in order from upper
left to lower right.
L S i n g l e frame
G6M0195 G6M0197 G6M0198
WI-5
I
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM
When one set of connectors is viewed from the
front side, the pole numbers of one connector are
symmetrical to those of the other. When these two
Color code Color
connectors are connected as a unit, the poles
which have the same number are joined. L Blue
I B I Black I
I Y I Yellow I
G Green
R Red
W White
Br Brown
L i Light green
Gr Gray
I P I Pink I
Or Orange
Lb Liaht Blue
Electrical wiring harness: v Violet
The connectors are numbered along with the num- SA- Sealed (Inner)
ber of poles, external colors, and mating connec- SB Sealed (Outer)
tions in the accompanying list.
The sketch of each connector in the wiring dia-
gram usually shows the (A) side of the connector.
The relationship between the wire color, terminal Sealed wire
number and connector is described in the figure.
7-w
NOTE:
A wire which runs in one direction from a connector
terminal sometimes may have a different color from R
that which runs in the other direction from that ter-
minal.
Wire color: -__________
I
BR (No. 1 terminal)
RW (No. 3 terminal)
H6M0509A
In the wiring diagram, connectors which have no
terminal number refer to one-pole types. Sketches G6M0201
of these connectors are omitted intentionally.
I
G6M0216
WI-6
BASIC DIAGNOSTICS PROCEDURE
WIRING SYSTEM
The wire color code, which consists of two letters Each unit is directly grounded to the body or indi-
(or three letters including Br or Lg), indicates the rectly grounds through a harness ground terminal.
standard color (base color of the wire covering) by Different symbols are used in the wiring diagram to
its first letter and the stripe marking by its second identify the two grounding systems.
letter.
_ -E
Y
E M a r k i n g color: Black
Reference color: Yellow
1
Direct ground Indirect terminal
ground
G6M0203
G6M0202
The ground points shown in the wiring diagram
The table lists the nominal sectional areas and refer to the following:
allowable currents of the wires. NOTE:
CAUTION: All wiring harnesses are provided with a ground
When replacing or repairing a wire, be sure to point which should be securely connected.
use the same size and type of the wire which I
was originally used.
NOTE: @ : Body ground
The allowable current in the table indicates the
tolerable amperage of each wire at an ambient @ : Engine ground
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