Subaru 2004 LEGACY User manual

FUJI HEAVY INDUSTRIES LTD. G2320GE7
2004 LEGACY SERVICE MANUAL QUICK REFERENCE INDEX
BODY 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.
HVAC SYSTEM
(HEATER, VENTILATOR AND A/C) AC
HVAC SYSTEM (AUTO A/C)
(DIAGNOSTICS) AC(diag)
AIRBAG SYSTEM AB
AIRBAG SYSTEM (DIAGNOSTICS) AB(diag)
SEAT BELT SYSTEM SB
LIGHTING SYSTEM LI
WIPER AND WASHER SYSTEMS WW
ENTERTAINMENT ET
COMMUNICATION SYSTEM COM
GLASS/WINDOWS/MIRRORS GW
BODY STRUCTURE BS
INSTRUMENTATION/DRIVER INFO IDI
SEATS SE
SECURITY AND LOCKS SL
SUNROOF/T-TOP/CONVERTIBLE TOP
(SUNROOF) SR
EXTERIOR/INTERIOR TRIM EI
EXTERIOR BODY PANELS EB

2003 LEGACY SERVICE MANUAL QUICK REFERENCE INDEX
BODY SECTION
G2320GE7
CRUISE CONTROL SYSTEM CC
CRUISE CONTROL SYSTEM
(DIAGNOSTICS) CC(diag)
IMMOBILIZER (DIAGNOSTICS) IM(diag)
LAN SYSTEM (DIAGNOSTICS) LAN(diag)

IMMOBILIZER (DIAGNOSTICS)
IM(diag)
Page
1. Basic Diagnostic Procedure........................................................................2
2. General Description ....................................................................................4
3. Electrical Component Location ...................................................................6
4. Immobilizer Control Module I/O Signal........................................................7
5. Subaru Select Monitor.................................................................................8
6. Read Diagnostic Trouble Code (DTC)........................................................9
7. Clear Memory Mode..................................................................................10
8. Diagnostics Chart for Immobilizer Indicator Light......................................11
9. List of Diagnostic Trouble Code (DTC).....................................................15
10. Diagnostic Procedure with Diagnostic Trouble Code (DTC).....................17

IM(diag)-2
IMMOBILIZER (DIAGNOSTICS) Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1 CHECK IMMOBILIZER WARNING LIGHT.
1) Turn the ignition switch to “OFF” or “ACC”.
2) Wait for more than 60 seconds.
Does the immobilizer warning
light blink? Go to step 2. Check the immobi- lizer warning light
circuit. <Ref. to
IM(diag)-11,
CHECK IMMOBI-
LIZER INDICA-
TOR CIRCUIT,
INSPECTION,
Diagnostics Chart
for Immobilizer
Indicator Light.>
2 CHECK KEY SWITCH.
Remove the key from ignition switch. Does the immobilizer warning light blink within 1 second after
removing ignition key?
Go to step 3. Check the key
switch circuit.
<Ref. to IM(diag)-
13, CHECK KEY
SWITCH CIR-
CUIT, INSPEC-
TION, Diagnostics
Chart for Immobi-
lizer Indicator
Light.>
3 CHECK IMMOBILIZER WARNING LIGHT.
Turn the ignition switch to ON. Does the immobilizer warning light off? Go to step 5. Go to step 4.
4 CHECK ENGINE START.
Turn the ignition switch to START. Does the starter operate? Check the LAN communication cir-
cuit. <Ref. to
LAN(diag)-2,Basic
Diagnostic Proce-
dure.>
Check the DTC
display (body inte-
grated unit). Go to
step 7.
5 CHECK ENGINE START.
Turn the ignition switch to START. Does the starter operate? Go to step 6. Check the LAN communication cir-
cuit. <Ref. to
LAN(diag)-2,Basic
Diagnostic Proce-
dure.>
6 CHECK ENGINE START.
Turn the ignition switch to START. Does the engine start? Immobilizer sys- tem is OK. Check the DTC display (ECM). Go
to step 7.
7 CHECK INDICATION OF DTC ON DISPLAY.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector. <Ref. to IM(diag)-8, Subaru
Select Monitor.>
3) Turn the ignition switch and Subaru Select
Monitor switch to ON.
4) Read DTC on display.
Is the DTC displayed on
screen? Go to step 8. Repair the related parts.

IM(diag)-3
IMMOBILIZER (DIAGNOSTICS)
Basic Diagnostic Procedure
8 PERFORM THE DIAGNOSIS.
1) Inspect using the “Diagnostic Procedure
with Diagnostic Trouble Code (DTC)”.
<Ref. to IM(diag)-17, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform clear memory mode.
4) Read DTC again.
Is the DTC displayed on
screen? Inspect using the “Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”. <Ref. to
IM(diag)-17, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Finish the diagno-
sis.
Step Check Yes No

IM(diag)-4
IMMOBILIZER (DIAGNOSTICS) General Description
2. General Description
A: CAUTION
CAUTION:
• All airbag system wiring harnesses and con-
nectors are yellow. Do not use the electrical
test equipment on these circuits.
• Be careful not to damage the airbag system
wiring harness.
• While diagnostic items are being checked, do
not operate radios, portable telephones, etc.
which emit electromagnetic waves near or in-
side the vehicle.
• When turning the ignition switch to ON or
OFF while diagnostic items are being checked,
do not allow keys with different ID codes close
to the ignition switch. If the ignition key is in a
key holder, remove it from the holder before
carrying out diagnosis.
• When repeatedly turning the ignition switch
to ON or OFF while diagnostic items are being
checked, it should be switched in cycles of
“ON” for at least 5 seconds→“OFF” for at least
8 seconds.
• If the engine fails to start with a registered ig-
nition key, detach the ignition key from ignition
switch and wait for approx. 1 second until im-
mobilizer indicator light begins to flash. And
then start the engine again.
• Before checking the diagnostic items, obtain
all keys for the vehicle to be checked pos-
sessed by owner.
IM-00001
IM-00002
(1) Ignition switch position
(2) Sec.
IM-00003
ON
OFF
58
(2)
(1)

IM(diag)-5
IMMOBILIZER (DIAGNOSTICS)
General Description
B: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
24082AA230 CARTRIDGE Troubleshooting for electrical system.
22771AA030 SUBARU SELECT
MONITOR KIT Troubleshooting for electrical system. • English: 22771AA030 (Without printer)
• German: 22771AA070 (Without printer)
• French: 22771AA080 (Without printer)
• Spanish: 22771AA090 (Without printer)
TOOL NAME REMARKS
Circuit tester Used for measuring resistance, voltage and ampere.
ST24082AA23
0
ST22771AA03
0

IM(diag)-6
IMMOBILIZER (DIAGNOSTICS) Electrical Component Location
3. Electrical Component Location
A: LOCATION
NOTE:
Body integrated unit location for RHD model is symmetrically opposite.
(1) Antenna (3) Body integrated unit (4) Transponder
(2) Immobilizer indicator light (LED
bulb)
IM-00083
(2)
(4)
(1)
(3)

IM(diag)-7
IMMOBILIZER (DIAGNOSTICS)
Immobilizer Control Module I/O Signal
4. Immobilizer Control Module
I/O Signal
A: WIRING DIAGRAM
1. IMMOBILIZER
<Ref. to WI-246, WIRING DIAGRAM, Immobilizer
System.>

IM(diag)-8
IMMOBILIZER (DIAGNOSTICS) Subaru Select Monitor
5. Subaru Select Monitor
A: OPERATION
1. HOW TO USE SUBARU SELECT MONI-
TOR
1) Prepare the Subaru Select Monitor kit.
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor.
4) Connect the Subaru Select Monitor to data link
connector.
(1) Data link connector is located in the lower
portion of the instrument panel (on the driver’s
side).
(2) Connect the diagnosis cable to data link
connector.
CAUTION:
Do not connect the scan tools except for Suba-
ru Select Monitor.
5) Turn the ignition switch to ON (engine OFF), and
the Subaru Select Monitor switch to ON.
6) Using the Subaru Select Monitor, call up DTCs
and various data, then record them.
2. READ DIAGNOSTIC TROUBLE CODE
(DTC) FOR ENGINE AND BODY INTEGRAT-
ED UNIT
Refer to Read Diagnostic Trouble Code for infor-
mation about how to indicate DTC. <Ref. to IM(di-
ag)-9, Read Diagnostic Trouble Code (DTC).>
3. COMMUNICATION LINE CHECK
NOTE:
The communication line between ECM and body
integrated module can be checked in “System Op-
eration Check Mode”. This is referred to as “Com-
munication line check”.
1) Connect the Subaru Select Monitor.
2) On the «System operation check mode» display,
select the {security system}.
3) Start the communication line check.
4) Is «Communication Line not Shorted» displayed
on screen?
If displayed, go to step 5).
If “NO”, go to step 6).
5) After diagnostic results, it is determined that the
circuit is not shorted. Finish the communication line
check.
6) If a problem is detected, repair the trouble
cause. <Ref. to IM(diag)-22, DTC P1572 IMM CIR-
CUIT FAILURE (EXCEPT ANTENNA CIRCUIT),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
CC-0002
8
CC-0002
9
IM-00084
(1) Power switch
CC-0004
5
(1)