Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 796
WI-13
Basic Diagnostic Procedure
WIRING SYSTEM
F: ABBREVIATION IN WIRING DIAGRAMS
Abbr.
Full name
ABS
Anti-lock Brake System
ACC
Accessory
A/C
Air Conditioner
ASSY
Assembly
A/F
Air/Fuel (Air fuel ratio sensor)
AUX
Auxiliary Audio Input Terminal
B
Battery
CAN
Controller Area Network
CM
Control Module
DN
Down
DCCD
Driver’s Control Center Differential
E
Ground
ECM
Engine Control Module
EEPROM
Electrically Erasable Programmable Read-
Only Memory
ELCM
Evaporative Leak Check Module
F/B
Fuse & Relay Box
FL
Front Left
FR
Front Right
G
Gravity (G sensor)
H/L
Headlight
HI
High
I/F
Interface
IG
Ignition
INT
Intermittent
LCD
Liquid Crystal Display
LH
Left Hand
LO
Low
M
Motor
M/B
Main Fuse Box
PASS
Passing
RH
Right Hand
RL
Rear Left
RR
Rear Right
SBF
Slow Blow Fuse
SI-DRIVE
SUBARU Intelligent Drive
ST
Starter
SW
Switch
TPMS
Tire Pressure Monitor System
VDC
Vehicle Dynamics Control
VFD
Vacuum Fluorescent Display
WASH
Washer
WI-14
Working Precautions
WIRING SYSTEM
2. Working Precautions
A: PRECAUTIONS WHEN WORKING
WITH THE PARTS MOUNTED ON
THE VEHICLE
1) When working under a vehicle which is jacked-
up, always be sure to use rigid rack.
2) The parking brake must always be applied dur-
ing working. Also, in automatic transmission vehi-
cles, keep the select lever set to the P (Parking)
range.
3) Be sure the workshop is properly ventilated
when running the engine. Further, be careful not to
touch the belt or fan while the engine is operating.
4) Be careful not to touch hot metal parts, especial-
ly the radiator and exhaust system immediately af-
ter the engine has been turned off.
B: PRECAUTIONS IN TROUBLE DI-
AGNOSIS AND REPAIR OF ELEC-
TRIC PARTS
1) The battery cable must be disconnected from
the battery’s (–) terminal, and the ignition switch
must be set to the OFF position, unless otherwise
required by the diagnostics.
2) Securely fasten the wiring harness with clamps
and clips so that the harness does not interfere with
the body end parts, edges, bolts or screws.
3) When installing parts, be careful not to catch
them on the wiring harness.
4) When disconnecting a connector, do not pull the
wires, but pull while holding the connector body.
5) Some connectors are provided with a lock. One
type of such a connector is disconnected by push-
ing the lock, and the other, by moving the lock up.
In either type the lock shape must be identified be-
fore attempting to disconnect the connector.
To connect, insert the connector until it snaps and
confirm that it is connected securely.
6) When checking continuity between connector
terminals, or measuring voltage across the terminal
and ground, always touch tester probe(s) to termi-
nals from the wiring connection side. If the probe is
too thick to gain access to the terminal, use “mini”
test leads.
To check water-proof connectors (which are not
measurable from the wiring side), touch test probes
on the terminal side and be careful not to bend or
damage the terminals.
7) Sensors, relays, electrical unit, etc., are sensi-
tive to strong impacts.
Handle them with care so that they are not dropped
or mishandled.
WI-02757
WI-02758
EXAMPLE
WI-09366
WI-15
Power Supply Circuit
WIRING SYSTEM
3. Power Supply Circuit
A: WIRING DIAGRAM
•
Engine room side
WI-30585
P-SUP-01
P-SUP-01
SBF-1
SBF-5
SBF-7
SBF-4
SBF-3
SBF-2
SBF-6
SBF-8
SBF-9
SECONDARY AIR FUSE & RELAY BOX
No. 7
No. 6
No. 5
No. 2
No. 1
No. 4
No. 3
No. 10
No. 9
No. 16
No. 15
No. 14
No. 13
No. 12
No. 11
No. 8
MAIN FUSE BOX (M/B)
No. 17
R.DEF
RELAY
H/L
RELAY
LO
MAIN
SBF
MAIN
FAN
RELAY-1
H/L
RELAY
HI
AIR
CUT
AIR
PUMP
RELA
Y
HORN
RELAY
AIR CUT
RELAY 1
AIR CUT
RELAY 2
WI-16
Power Supply Circuit
WIRING SYSTEM
•
Passenger room side
WI-30372
P-SUP-02
P-SUP-02
15 A
15 A
15 A
10 A
No. 5
No. 4
No. 3
No. 2
No. 1
No. 12
No. 11
No. 10
No. 9
No. 8
No. 7
No. 6
No. 19
No. 18
No. 17
No. 16
No. 15
No. 14
No. 13
No. 26
No. 25
No. 24
No. 23
No. 22
No. 21
No. 20
No. 33
No. 32
No. 31
No. 30
No. 29
No. 28
No. 27
FUSE & RELAY BOX (F/B) FRONT SIDE
7.5 A
FUSE & RELAY BOX (F/B) BACK SIDE
RELAY BLOCK
RELAY BLOCK
A/F
,
OX
Y
G
E
N
SENSOR RELA
Y
MAIN
RELA
Y
F-FOG
RELA
Y
IG 2
RELAY
ACC
RELAY
FUEL
PUMP
RELA
Y
DCCD
RELA
Y
ELECTRIC THR
O
TTLE
CONTR
OL
RELA
Y
PO
WER
WINDO
W
RELA
Y
TA
IL
&
ILLUMI
RELA
Y
ST
AR
TER
RELA
Y
DEICER
RELA
Y
SEA
T
HEA
TER
RELA
Y
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