Subaru Legacy IV (2008 year). Manual — part 1164

IM(diag)-13

Diagnostics Chart for Security Indicator Light

IMMOBILIZER (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK POWER SUPPLY CIRCUIT.
1) Disconnect the key warning switch harness
connector.
2) Turn the ignition switch to “ACC” or “LOCK”
(with key inserted).
3) Measure the voltage between key warning
switch harness connector terminal and chassis
ground.

Connector & terminal

(B350) No. 3 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step 2.

Check the harness
for an open or
short between the
key warning switch
and fuse.

2

CHECK KEY WARNING SWITCH.
1) Insert the ignition key in the ignition switch.
(OFF or ACC)
2) Measure the resistance between key warn-
ing switch connector terminals.

Connector & terminal

No. 3 — No. 4:

Is the resistance less than 1

:? Go to step 3.

Replace the key
warning switch.

3

CHECK KEY WARNING SWITCH.
1) Remove the ignition key from ignition
switch.
2) Measure the resistance between key warn-
ing switch connector terminals.

Connector & terminal

No. 3 — No. 4:

Is the resistance 1 M

: or

more?

Go to step 4.

Replace the key
warning switch.

4

CHECK HARNESS BETWEEN KEY WARN-
ING SWITCH AND BODY INTEGRATED
UNIT.
1) Disconnect the key warning switch harness
connector.
2) Disconnect the harness connector from
body integrated unit.
3) Measure the resistance between key warn-
ing switch harness connector terminal and body
integrated unit harness connector terminal.

Connector & terminal

(B350) No. 4 — (B281) No. 7:

Is the resistance less than 10

:? Replace the body

integrated unit
<Ref. to SL-56,
Body Integrated
Unit.> Replace all
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the “PC
application help for
Subaru Select
Monitor”.

Repair the harness
between key warn-
ing switch and
body integrated
unit.

IM(diag)-14

List of Diagnostic Trouble Code (DTC)

IMMOBILIZER (DIAGNOSTICS)

9. List of Diagnostic Trouble Code (DTC)

A: LIST

1. ECM

NOTE:
Perform diagnosis of engine DTC when a DTC other than an immobilizer DTC is detected. <Ref. to
EN(H4DOTC)(diag)-81, List of Diagnostic Trouble Code (DTC).> <Ref. to EN(H6DO)(diag)-81, List of Diag-
nostic Trouble Code (DTC).>

DTC

Item

Contents of diagnosis

Index No.

P0513

Incorrect Immobilizer Key

Incorrect immobilizer key (Use of
unregistered key in body integrated
unit)

<Ref. to IM(diag)-16, DTC P0513 INCORRECT
IMMOBILIZER KEY, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P1570

Antenna

Faulty antenna

<Ref. to IM(diag)-17, DTC P1570 ANTENNA,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P1571

Reference Code Incompatibility

Reference code incompatibility
between body integrated unit and
ECM

<Ref. to IM(diag)-19, DTC P1571 REFERENCE
CODE INCOMPATIBILITY, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

P1572

IMM Circuit Failure
(Except Antenna Circuit)

Communication failure between
body integrated unit and ECM

<Ref. to IM(diag)-20, DTC P1572 IMM CIRCUIT
FAILURE (EXCEPT ANTENNA CIRCUIT),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P1574

Key Communication Failure

Communication failure between key
and body integrated unit

<Ref. to IM(diag)-23, DTC P1574 KEY COM-
MUNICATION FAILURE, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

P1576

EGI Control Module EEPROM

ECM malfunctioning

<Ref. to IM(diag)-23, DTC P1576 EGI CON-
TROL MODULE EEPROM, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

P1577

IMM Control Module EEPROM

Body integrated unit malfunctioning

<Ref. to IM(diag)-24, DTC P1577 IMM CON-
TROL MODULE EEPROM, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

P1578

Meter Failure

• Reference code incompatibility
between combination meter and
body integrated unit
• Communication failure between
body integrated unit and ECM

<Ref. to IM(diag)-24, DTC P1578 METER FAIL-
URE, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

IM(diag)-15

List of Diagnostic Trouble Code (DTC)

IMMOBILIZER (DIAGNOSTICS)

2. BODY INTEGRATED UNIT

NOTE:
The starter relay control is performed in immobilizer system. When the body integrated unit detect the incon-
formity of reference code, immediately output the starter relay cut signal to ECM, and then ECM stop the
starter relay operation. In this case, engine does not start, and DTC is not recorded in ECM. Check that the
engine does not start on the DTC of body integrated unit.

DTC

Item

Contents of diagnosis

Index No.

Relation between

ECM and DTC

B1401

M collation NG

Reference code incompatibility
between combination meter
and body integrated unit

<Ref. to IM(diag)-24, DTC P1578 METER
FAILURE, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P1578

B1402

Immobirizer Key
collation NG

• Incorrect immobilizer key
(Use of unregistered key in
body integrated unit)
• Faulty antenna

<Ref. to IM(diag)-16, DTC P0513 INCOR-
RECT IMMOBILIZER KEY, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).> <Ref. to IM(diag)-17, DTC P1570
ANTENNA, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).> or <Ref.
to IM(diag)-23, DTC P1574 KEY COMMU-
NICATION FAILURE, Diagnostic Proce-
dure with Diagnostic Trouble Code
(DTC).>

• P0513
• P1570
• P1574

B1403

E/G request NG

Communication failure
between body integrated unit
and ECM

<Ref. to IM(diag)-20, DTC P1572 IMM
CIRCUIT FAILURE (EXCEPT ANTENNA
CIRCUIT), Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P1572

IM(diag)-16

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

IMMOBILIZER (DIAGNOSTICS)

10.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC P0513 INCORRECT IMMOBILIZER KEY

DTC DETECTING CONDITION:
Incorrect immobilizer key (Use of unregistered key in body integrated unit)

Step

Check

Yes

No

1

PERFORM REGISTRATION ON IGNITION
KEY.
Perform registration on all keys of the vehicle.
Refer to the “PC application help for Subaru
Select Monitor”.

Is registration for all keys com-
plete?

END

Replace ignition
keys (including
transponder)
which cannot be
registered. Go to
step 2.

2

PERFORM REGISTRATION ON IGNITION
KEY.
Perform registration on all keys of the vehicle.
Refer to the “PC application help for Subaru
Select Monitor”.

Is registration for all keys com-
plete?

END

Replace the body
integrated unit
<Ref. to SL-56,
Body Integrated
Unit.> Replace all
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the “PC
application help for
Subaru Select
Monitor”.