Subaru 2004 Forester User manual

FUJI HEAVY INDUSTRIES LTD. G8080GE7
2004 FORESTER 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)
(DIAGNOSTIC) AC
AIRBAG SYSTEM AB
AIRBAG SYSTEM (DIAGNOSTIC) AB
SEAT BELT SYSTEM SB
LIGHTING SYSTEM LI
WIPER AND WASHER SYSTEM WW
ENTERTAINMENT ET
COMMUNICATION SYSTEM COM
GLASS/WINDOW/MIRROR GW
BODY STRUCTURE BS
INSTRUMENTATION/DRIVER INFO IDI
SEAT SE
SECURITY AND LOCK SL
SUNROOF/T-TOP/CONVERTIBLE TOP
(SUNROOF) SR
EXTERIOR/INTERIOR TRIM EI
EXTERIOR BODY PANEL EB

2004 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX
BODY SECTION
G8080GE7
CRUISE CONTROL SYSTEM CC
CRUISE CONTROL SYSTEM
(DIAGNOSTIC) CC(H4SO)
CRUISE CONTROL SYSTEM
(DIAGNOSTIC) CC(H4DOTC)
CRUISE CONTROL SYSTEM
(DIAGNOSTIC) CC(H4DOTC 2.5)
IMMOBILIZER (DIAGNOSTIC) IM

IMMOBILIZER (DIAGNOSTIC)
IM
Page
1. Basic Diagnostic Procedure ........................................................................2
2. General Description ....................................................................................3
3. Electrical Components Location..................................................................5
4. Immobilizer Control Module I/O Signal........................................................6
5. Subaru Select Monitor.................................................................................7
6. Read Diagnostic Trouble Code (DTC) ........................................................8
7. Clear Memory Mode....................................................................................9
8. Diagnostics Chart for Immobilizer Warning Light ......................................10
9. List of Diagnostic Trouble Code (DTC) .....................................................14
10. Diagnostics Procedure with Diagnostic Trouble Code (DTC) ...................15

IM-2
IMMOBILIZER (DIAGNOSTIC)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1 CHECK ILLUMINATION OF IMMOBILIZER
WARNING LIGHT.
1) Turn the ignition switch to OFF or ACC
position.
2) Wait at least 60 seconds.
Does the immobilizer warning
light blink?
Go to step 2. Check the immobi-
lizer warning light
circuit. <Ref. to IM-
10, CHECK
IMMOBILIZER
WARNING CIR-
CUIT, INSPEC-
TION, Diagnostics
Chart for Immobi-
lizer Warning
Light.>
2 CHECK ILLUMINATION OF IMMOBILIZER
WARNING LIGHT.
Remove the key from ignition switch.
Does the immobilizer warning
light begin to blink within 1 sec-
ond after the key is removed?
Go to step 3. Check the key
switch circuit.
<Ref. to IM-12,
CHECK KEY
WARNING
SWITCH CIR-
CUIT, INSPEC-
TION, Diagnostics
Chart for Immobi-
lizer Warning
Light.>
3 CHECK ENGINE START.
Turn the ignition switch to START position.
Does the engine start? Go to step 4. Go to step 5.
4 CHECK ILLUMINATION OF IMMOBILIZER
WARNING LIGHT.
Turn the ignition switch to ON.
Does the immobilizer warning
light illuminate?
Check the immobi-
lizer warning light
circuit. <Ref. to IM-
10, CHECK
IMMOBILIZER
WARNING CIR-
CUIT, INSPEC-
TION, Diagnostics
Chart for Immobi-
lizer Warning
Light.>
Immobilizer sys-
tem is normal.
5 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-7, Subaru Select
Monitor.>
3) Turn the ignition switch and Subaru Select
Monitors witch to ON.
4) Read any DTC on the display.
Are DTCs indicated on dis-
play?
Go to step 6. Repair the related
parts.
6 PERFORM THE DIAGNOSIS.
1) Inspect using “Diagnostics Chart with Trou-
ble Code”. <Ref. to IM-15, Diagnostics Proce-
dure with Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform the clear memory mode.
4) Read any DTC again.
Are DTCs indicated on dis-
play?
Inspect using
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”. <Ref. to
IM-15, Diagnos-
tics Procedure
with Diagnostic
Trouble Code
(DTC).>
Finish the diag-
nostics.

IM-3
IMMOBILIZER (DIAGNOSTIC)
General Description
2. General Description
A: CAUTION
CAUTION:
• The airbag system wiring harnesses rout-
ed near the immobilizer control module. All
airbag system wiring harness and connec-
tors are colored yellow. Do not use electrical
test equipment on these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the immobilizer
control module.
• While diagnostic items are being checked, do
not operate radios, portable telephones, etc.
which emit electromagnetic waves near or
inside the vehicle.
• When the ignition switch is being turned 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 diagnoses.
• 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
ignition key, detach the ignition key from ignition
switch and wait for approx. 1 second until immobi-
lizer warning light begins to flash. Start the engine
again.
• Before checking the diagnostic items, obtain
all keys for the vehicle to be checked possessed
by owner.
IM-00001
IM-00002
(1) Ignitions witch position
(2) Sec.
IM-00003
ON
OFF
58
(2)
(1)

IM-4
IMMOBILIZER (DIAGNOSTIC)
General Description
B: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION TOOLNUMBER DESCRIPTION REMARKS
24082AA230
(Newly adopted tool)
CARTRIDGE Troubleshooting for electrical systems.
22771AA030 SUBARUSELECT
MONITOR KIT
Troubleshooting for electrical systems.
•English:
22771AA030 (Without printer)
•German:
22771AA070 (Without printer)
• French:
22771AA080 (Without printer)
• Spanish:
22771AA090 (Without printer)
TOOLNAME REMARKS
Circuit tester Used for measuring resistance, voltage and ampere.
ST24082AA230
ST22771AA030

IM-5
IMMOBILIZER (DIAGNOSTIC)
Electrical Components Location
3. Electrical Components Location
A: LOCATION
NOTE:
IMM ECM location for RHD model is symmetrically
opposite.
(1) Antenna (3) Immobilizer control module (IMM
ECM)
(4) Transponder
(2) Immobilizer warning light (LED)
IM-00004
(1)
(2)
(3)
(4)

IM-6
IMMOBILIZER (DIAGNOSTIC)
Immobilizer Control Module I/O Signal
4. Immobilizer Control Module I/O
Signal
A: WIRING DIAGRAM
1. IMMOBILIZER
<Ref. to WI-194, WIRING DIAGRAM, Immobilizer
System.>

IM-7
IMMOBILIZER (DIAGNOSTIC)
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 into 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 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
then Subaru Select Monitor switch to ON.
6) Using the Subaru Select Monitor, call up any
DTCs and various data, and then record them.
2. READ DIAGNOSTIC TROUBLE CODE
(DTC) FOR ENGINE.
Refer to Read Diagnostic Trouble Code for informa-
tion about how to indicate DTC. <Ref. to IM-8, Read
Diagnostic Trouble Code (DTC).>
3. COMMUNICATION LINE CHECK
NOTE:
The communication line between ECM and IMM
ECM can be checked in «System Operation Check
Mode». This is referred to as “communication line
check”.
1) Connect the Subaru Select Monitor.
2) Set the «System Operation Check Mode» menu
display screen, and then select {Immobilizer Sys-
tem}.
3) Start the communication line check.
4) Does “Communication Line not Shorted” appear
on screen?
If “YES”. Go to step 5).
If “NO”. Go to step 6).
5) After diagnostic results, it is determined that the
short circuit is not a diagnostic item. This completes
communication line check.
6) If a problem is detected, repair. <Ref. to IM-16,
DTC P1572 IMM CIRCUIT FAILURE (EXCEPT
ANTENNA CIRCUIT), Diagnostics Procedure with
Diagnostic Trouble Code (DTC).>
CC-00028
CC-00029
ME-00325
(1) Power switch
CC-00045
(1)

IM-8
IMMOBILIZER (DIAGNOSTIC)
Read Diagnostic Trouble Code (DTC)
6. Read Diagnostic Trouble
Code (DTC)
A: OPERATION
1) On the «Main Menu» display screen, select the
{Each System Check}, and then press the [YES] key.
2) On the «System Selection Menu» display screen,
select the {Engine Control System}, and then press
the [YES] key.
3) Press the [YES] key after displayed information
of engine type.
4) On the «Engine Diagnosis» display screen, se-
lect the {Diagnostic Code(s) Display}, and then
press the [YES] key.
5) On the «Diagnostic Code(s) Display» display
screen, select the {Current Diagnostic Code(s)} or
{History Diagnostic Code(s)}, and then press the
[YES] key.
NOTE:
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
• For detailed concerning diagnostic trouble codes,
refer to the List of Diagnostic Trouble Code (DTC).
<Ref. to IM-14, LIST, List of Diagnostic Trouble
Code (DTC).>

IM-9
IMMOBILIZER (DIAGNOSTIC)
Clear Memory Mode
7. Clear Memory Mode
A: OPERATION
1) On the «Main Menu» display screen, select the
{Each System Check}, and then press the [YES] key.
2) On the «System Selection Menu» display screen,
select the {Engine Control System}, and then press the
[YES] key.
3) Press the [YES] key after displayed information
of engine type.
4) On the «Engine Diagnosis» display screen, se-
lect the {Clear Memory}, and then press the [YES]
key.
5) When the `Done’ is shown on the display screen,
turn the Subaru Select Monitor and ignition switch
to OFF.
NOTE:
• After the memory has been cleared, the ISC must be
initialized.To do this, turn the ignition switch to ON po-
sition. Wait 3 seconds before starting the engine.
• For detailed operation procedure, refer to the SUB-
ARUSELECT MONITOR OPERATION MANUAL.

IM-10
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Chart for Immobilizer Warning Light
8. Diagnostics Chart for Immobilizer Warning Light
A: INSPECTION
1. CHECK IMMOBILIZER WARNING CIRCUIT
WIRING DIAGRAM:
IM-00081
F60
B21
RHD
SBF-1
SBF-5 SBF-4
BATTERY
IMMOBILIZER
WARNING
LIGHT
COMBINATION METER
B141 IMM ECM
B37
i2
i2
B37
i12
B37
i2
LHD
RHD
LHD
6
RHD
M/B No.2
F/B No.11
IGNITION
SWITCH
9
12 11 10
2
B8
3
: RHD MODEL
1 : Non-turbo AT MODEL: 14
: MT MODEL AND
TURBO AT MODEL:4
i12
B141
3412
89
10 11 12
5
67
21
9
32
B38
1234 56
10 11 12 13 14 15
7
16
23 30
19 20
22 26 27 28 29
8
17
24 31
18
25
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LHD
B37
3412 89
10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
567
i10
123456789
10
B:
E
A: i10
B:
i11
C:
: LHD TURBO MODEL
LT
: EXCEPT LHD TURBO MODEL
XL
3412 89 10
11 12 13 14 15 16 17 18 19 20 21 22
567
i2 RHD
F2 LHD
LHD
LHD
7
F44 B61
RHD
RHD
LHD : LHD MODEL
1
2
i11
C:
LHD
LHD
18
i3
B38
RHD RHD
3
XL
LT
XL
LT
9
16
16
F2 B100
B21
E2
F60
E3
LHD
RHD
2 : LHD MODEL: A4
: RHD MODEL: C5
3 : Non-turbo AT MODEL: 22
: MT MODEL AND
TURBO AT MODEL: 18
A:
:
AT
:
23178
9 1011121314 15 16 17 18
456
i2 RHD MT
:
1234 56789
10 11 12 13 14 15 16 17 18 19 20
1234
5678
9
10 11 12
13 14 15 16
1 2 3 4 5 6
87 9 10 11 12 13 14
F44
1234
5 6 7 8

IM-11
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Chart for Immobilizer Warning Light
Step Check Yes No
1 CHECK IMMOBILIZER WARNING LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
IMM ECM.
3) Connect a resistor (750 Ω) between IMM
ECM harness connector terminal No. 9 and
chassis ground.
Does the immobilizer warning
light illuminate?
Go to step 2. Go to step 5.
2 CHECK IMM ECM GROUND CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 2, No. 3 — Chassis ground:
Is the resistance less than 10
Ω?
Go to step 3. Repair the open
circuit of IMMECM
ground circuit.
3 CHECK IMM ECM IGNITION CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 12 (+) — Chassis ground(
− ):
Is the voltage more than 10 V? Go to step 4. Check the harness
for open or short
between IMM
ECM and ignition
switch.
4 CHECK IMM ECM POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 10, No. 11 (+) — Chassis
ground(
− ):
Is the voltage more than 10 V? Replace the IMM
ECM <Ref. to SL-
37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
Check the harness
for open or short
between IMM
ECM and fuse.
5 CHECK COMBINATION METER CIRCUIT.
1) Remove the combination meter. <Ref. to
IDI-10, Combination Meter Assembly.>
2) Measure the voltage between combination
meter harness connector terminal and chassis
ground.
Connector & terminal
(i10) No. 8 (+) — Chassis ground (
− ):
Is the voltage more than 10 V? Go to step 6. Check the harness
for open or short
between combina-
tion meter and
fuse.
6 CHECK COMBINATION METER CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and combination
meter harness connector terminal.
Connector & terminal
LHD model
(B141) No. 9 — (i12) No. 4:
RHD model
(B141) No. 9 — (i11) No. 5:
Is the resistance less than 10
Ω?
Faulty LED.
Replace the com-
bination meter
printed circuit.
<Ref. to IDI-11,
DISASSEMBLY,
Combination
Meter Assembly.>
Repair the har-
ness or connector.

IM-12
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Chart for Immobilizer Warning Light
2. CHECK KEY WARNING SWITCH CIRCUIT
WIRING DIAGRAM:
IM-00006
B74
B61
F44
KEY WARNING
SWITCH
B141 IMM ECM
LHD
RHD
LHD
RHD
BATTERY
M/B No.6
4
1
2
4
B74
1
2
B141
3412
89
10 11 12
5
67
F44
3
1
5678
LHD : LHD MODEL
: RHD MODEL
RHD
24

IM-13
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Chart for Immobilizer Warning Light
Step Check Yes No
1 CHECK POWER SUPPLY CIRCUIT.
1) Disconnect the harness connector from key
warning switch.
2) Measure the voltage between key warning
switch harness connector terminal and chassis
ground.
Connector & terminal
(B74) No. 2 (+) — Chassis ground ( − ):
Is the voltage more than 10 V? Go to step 2. Check the harness
for open or short
between key warn-
ing switch and
fuse.
2 CHECK KEY WARNING SWITCH.
1) Insert the ignition key to the ignition switch.
(OFF or ACC position)
2) Measure the resistance between key warn-
ing switch connector terminals.
Terminal
No. 1 — No. 2:
Is the resistance less than 1
Ω?
Go to step 3. Replace the key
warning switch.
3 CHECK KEY WARNING SWITCH.
1) Remove the ignition key from the ignition
switch.
2) Measure the resistance between key warn-
ing switch connector terminals.
Terminal
No. 1 — No. 2:
Is the resistance more than
1 MΩ?
Go to step 4. Replace the key
warning switch.
4 CHECK HARNESS BETWEEN KEY WARN-
ING SWITCH AND IMM ECM.
1) Disconnect the harness connector from key
warning switch.
2) Disconnect the harness connector from
IMM ECM.
3) Measure the resistance between key warn-
ing switch harness connector terminal and
IMM ECM harness connector terminal.
Connector & terminal
(B74) No. 1 — (B141) No. 4:
Is the resistance less than 10
Ω?
Replace the IMM
ECM <Ref. to SL-
37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
Repair the har-
ness between key
warning switch
and IMM ECM.

IM-14
IMMOBILIZER (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
9. List of Diagnostic Trouble Code (DTC)
A: LIST
NOTE:
Perform the engine DTC when the DTC except immobilizer DTC is detected. <Ref. to EN(H4SO)-72, List of
Diagnostic Trouble Code (DTC).> <Ref. to EN(H4DOTC)-74, List of Diagnostic Trouble Code (DTC).> <Ref.
to EN(H4DOTC 2.5)-65, List of Diagnostic Trouble Code (DTC).>
DTC Item Contents of diagnosis Index No.
P1571 Reference Code Incompati-
bility
Reference code incompatibility
between IMM ECM and ECM
<Ref. to IM-15, DTC P1571 REFERENCE CODE
INCOMPATIBILITY, Diagnostics Procedure with
Diagnostic Trouble Code (DTC).>
P1572
EGI — Immobilizer Commu-
nication
(Except Antenna Circuit)
Communication failure between
IMM ECM and ECM
<Ref. to IM-16, DTC P1572 IMM CIRCUIT FAIL-
URE (EXCEPT ANTENNA CIRCUIT), Diagnostics
Procedure with Diagnostic Trouble Code (DTC).>
P1574 Key — Immobilizer Commu-
nication
Failure of IMM ECM to verify key
(transponder) ID code
<Ref. to IM-19, DTC P1574 KEY COMMUNICA-
TION FAILURE, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P0513 Incorrect Immobilizer Key Incorrect immobilizer key (Use of
unregistered key in IMM ECM)
<Ref. to IM-20, DTC P0513 INCORRECT IMMOBI-
LIZER KEY, Diagnostics Procedure with Diagnostic
Trouble Code (DTC).>
P1576 EGI Control Module
EEPROM ECM malfunctioning
<Ref. to IM-20, DTC P1576 EGI CONTROL MOD-
ULE EEPROM, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P1577 IMMControl Module
EEPROM IMM ECM malfunctioning
<Ref. to IM-20, DTC P1577 IMM CONTROL MOD-
ULE EEPROM, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P1570 ANTENNA Faulty antenna <Ref. to IM-21, DTC P1570 ANTENNA, Diagnostics
Procedure with Diagnostic Trouble Code (DTC).>

IM-15
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
10.Diagnostics Procedure with Diagnostic Trouble Code (DTC)
A: DTC P1571 REFERENCE CODE INCOMPATIBILITY
DIAGNOSIS:
Reference code incompatibility between IMM ECM and ECM
Step Check Yes No
1 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to the teaching operation man-
ual.
Is teaching operation for all
keys completed?
END Replace the ECM
<Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>, IMM
ECM <Ref. to SL-
37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).

IM-16
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
B: DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT)
DIAGNOSIS:
Communication failure between IMM ECM and ECM
WIRING DIAGRAM:
IM-00082
NA
NA
B141 IMM ECM
ECM
B137
D:
12
6 1 3
11 10
2
ECM
B135
B:
TB
TB
: TURBO MODEL
TB
: NON-TURBO MODEL
NA
D27
D19
B137
D: B141
3412
89
10 11 12
5
67
B137
D: TBNA
E
RHD : RHD MODEL
LHD : LHD MODEL
TB
NA
XL : EXCEPT LHD TURBO MODEL
LT : LHD TURBO MODEL
XL
LT
XL
LT
9
16
16
F2 B100
B21
E2
F60
E3
TB
NA
:F60
1234
5678
9
10 11 12
13 14 15 16
4
1
5
3
2
6
1815 16
7 8 9 10 11
17 19 20
12 13
14
F2
1234 56789
10 11 12 13 14 15 16 17 18 19 20
:
B21
1 2
567
8
21
9
43
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27 28 29 30 31
F44
1234
5 6 7 8
BATTERY IGNITION
SWITCH
SBF-1
SBF-5
SBF-4 F/B No.11
RHD
RHD
7
F44 B61
LHD
LHD
1 : LHD MODEL: D18
: RHD MODEL: D17
2 : LHD MODEL: D17
: RHD MODEL: D18

IM-17
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SUPPLY CIRCUIT OF IMM
ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
IMM ECM.
3) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 10, No. 11 (+) — Chassis
ground(
− ):
Is the voltage more than 10 V? Go to step 2. Check the harness
for open or short
between IMM
ECM and fuse.
2 CHECK IGNITION SWITCH CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 12 (+) — Chassis ground(
− ):
Is the voltage more than 10 V? Go to step 3. Check the harness
for open or short
between IMM
ECM and ignition
switch.
3 CHECK GROUND CIRCUIT OF IMM ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 2, No. 3 — Chassis ground:
Is the resistance less than 10
Ω?
Go to step 4. Repair the open
circuit of IMMECM
ground circuit.
4 CHECK HARNESS BETWEEN IMM ECM
AND ECM.
1) Disconnect the harness connector from
ECM and IMM ECM.
2) Measure the resistance between IMM ECM
harness connector terminal and ECM harness
connector terminal.
Connector & terminal
Non-turbo LHD model
(B141) No. 1 — (B137) No. 17:
Non-turbo RHD model
(B141) No. 1 — (B137) No. 18:
Turbo model
(B141) No. 1 — (B137) No. 19:
Is the resistance less than 10
Ω?
Go to step 5. Repair the open
circuit of harness
between IMM
ECM and ECM.
5 CHECK HARNESS BETWEEN IMM ECM
AND ECM.
Measure the resistance between IMM ECM
harness connector terminal and ECM harness
connector terminal.
Connector & terminal
Non-turbo LHD model
(B141) No. 6 — (B137) No. 18:
Non-turbo model
(B141) No. 6 — (B137) No. 17:
Turbo model
(B141) No. 6 — (B137) No. 27:
Is the resistance less than 10
Ω?
Go to step 6. Repair the open
circuit of harness
between IMM
ECM and ECM.

IM-18
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
6 CHECK HARNESS OF COMMUNICATION
LINE.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 1, No. 6 (+) — Chassis ground
(
− ):
Is the voltage 0 V? Go to step 7. Repair the har-
ness between IMM
ECM and ECM,
because there is
short circuit with
battery voltage line
or ignition switch
“ON” line.
7 CHECK HARNESS OF COMMUNICATION
LINE.
Measure the voltage between ECM harness
connector terminal and engine ground.
Connector & terminal
Non-turbo model
(B137) No. 17, No. 18 (+) — Engine
ground(
− ):
Turbo model
(B137) No. 19, No. 27 (+) — Engine
ground(
− ):
Is the voltage 0 V? Go to step 8. Repair the har-
ness between IMM
ECM and ECM,
because there is
short circuit with
battery voltage line
or ignition switch
“ON” line.
8 CHECK ECM BY COMMUNICATION LINE
CHECK.
1) Connect the harness connector to ECM.
2) Disconnect the harness connector from
IMM ECM.
3) Perform communication line check. <Ref. to
IM-7, COMMUNICATION LINE CHECK,
OPERATION, Subaru Select Monitor.>
Does “Communication Line not
Shorted” appear on the
screen?
Replace the IMM
ECM <Ref. to SL-
37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
Replace the ECM.
<Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).> Then per-
form teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
Step Check Yes No