Subaru Legacy IV (2008 year). Manual - part 1114

SL-29

Security System

SECURITY AND LOCKS

NOTE:
Check the function settings of the body integrated unit if any of the following symptoms appear. <Ref. to
LAN(diag)-2, Basic Diagnostic Procedure.>
• The horn does not sound even when the security system operates. (Siren YES/NO)
• The horn sounds when setting the security to ON using the keyless transmitter. (Impact sensor YES/NO)

2. CHECK SECURITY SYSTEM CONDITION MEMORY

1) Remove the key from ignition switch.
2) Close all the doors, trunk lid and rear gate.
3) Open the front hood.
4) Press the LOCK button of transmitter, and then wait until the security indicator light flashes twice for 0.5
sec. at intervals of 2 seconds.
5) Disconnect the ground cable from the battery.
6) Connect the ground cable to the battery.
7) Check that the security indicator light blinks twice within 0.5 seconds at 2 second intervals. When it does
not blink, replace the body integrated unit.

3. SECURITY SYSTEM ON/OFF SETTING

1) Close all doors, trunk lid and rear gate, and sit down on the driver seat. Press the UNLOCK button of the
keyless transmitter.
2) Turn the ignition switch to ON.
3) Push the centralized door unlock switch down and open the driver’s side door at the same time, and hold
in this condition for 10 seconds.
4) If the security system is ON, it will turn OFF. If OFF, it will turn ON.

10

CHECK SECURITY ALARM CANCEL OPER-
ATION.
Press any button of transmitter while operating 
security alarm. Or turn the ignition switch to 
OFF 

o ON once.

Does all security alarm stop?
• Horn
• Hazard light

Go to step 11.

Check the ignition 
switch circuit. 
<Ref. to SL-33, 
CHECK IGNITION 
SWITCH CIRCUIT, 
INSPECTION,
Security System.>

11

CHECK SECURITY SYSTEM CONDITION 
MEMORY.
Check that the system functions properly even 
when the battery is not connected temporarily. 
<Ref. to SL-29, CHECK SECURITY SYSTEM 
CONDITION MEMORY, INSPECTION, Secu-
rity System.>

Does the system function prop-
erly when the battery is not con-
nected temporarily?

Go to step 12.

Replace the body 
integrated unit. 
<Ref. to SL-56, 
Body Integrated 
Unit.>

12

CHECK IMPACT SENSOR.
Check the sensibility of impact sensor. <Ref. to 
SL-53, CHECK IMPACT SENSOR, ADJUST-
MENT, Impact Sensor.>

Is the sensibility set properly?

Press the 
UNLOCK button of 
keyless transmit-
ter, and finish the 
diagnosis.

Adjust the sensitiv-
ity. <Ref. to SL-53, 
IMPACT SENSI-
TIVITY ADJUST-
MENT, 
ADJUSTMENT, 
Impact Sensor.>

Step

Check

Yes

No

SL-30

Security System

SECURITY AND LOCKS

4. CHECK DOOR SWITCH

Step

Check

Yes

No

1

CHECK INPUT FROM EACH DOOR SWITCH.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF) 
and run the “PC application for Subaru Select 
Monitor”.
3) On the «System Selection Menu» display, 
select the {Integ. unit mode}.
4) Select the {Current Data Display & Save}.
5) Check the door switch input to the body inte-
grated unit when opening the each door (front 
RH and LH, rear RH and LH).

Does the display switch 
between OFF

œON when 

opening the each door (front 
RH and LH, rear RH and LH)?

The door switch 
circuit is OK.

Go to step 2.

2

CHECK DOOR SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of body 
integrated unit.
3) Disconnect the harness connector of faulty 
door switch.
4) Measure the resistance between harness 
connector terminals.

Connector & terminal

(i84) No. 19 — (R9) No. 1: (front door LH)
(i84) No. 32 — (R12) No. 1: (front door RH)
(i84) No. 31 — (R22) No. 1: (rear door LH)
(i84) No. 18 — (R16) No. 1: (rear door RH)

Is the resistance less than 10 

:? Go to step 3.

Repair or replace 
the harness.

3

CHECK GROUND CIRCUIT OF DOOR 
SWITCH.
1) Disconnect the harness connector of faulty 
door switch.
2) Measure the resistance of harness connec-
tor and chassis ground.

Connector & terminal

(R9) No. 3 — Chassis ground: 
(front door LH)
(R12) No. 3 — Chassis ground: 
(front door RH)
(R22) No. 3 — Chassis ground: 
(rear door LH)
(R16) No. 3 — Chassis ground: 
(rear door RH)

Is the resistance less than 10 

:? Go to step 4.

Repair or replace 
the harness.

4

CHECK DOOR SWITCH.
1) Disconnect the harness connector of faulty 
door switch.
2) Measure the resistance between door 
switch terminals.

Terminals

No. 1 — No. 3:

Is the resistance 1 M

: or more 

when door switch is pushed?

Go to step 5.

Replace the door 
switch.

5

CHECK DOOR SWITCH.
Measure the resistance between door switch 
terminals.

Terminals

No. 1 — No. 3:

Is the resistance less than 1 

:

when door switch is released?

Check the body 
integrated unit. 
<Ref. to 
LAN(diag)-2, Basic 
Diagnostic Proce-
dure.>

Replace the door 
switch.

SL-31

Security System

SECURITY AND LOCKS

5. CHECK TRUNK LID SWITCH (SEDAN) OR REAR GATE LATCH SWITCH (WAGON)

Step

Check

Yes

No

1

CHECK INPUT FROM TRUNK LID SWITCH 
OR REAR GATE LATCH SWITCH.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF) 
and run the “PC application for Subaru Select 
Monitor”.
3) On the «System Selection Menu» display, 
select the {Integ. unit mode}.
4) Select the {Current Data Display & Save}.
5) Check the input signal to the body inte-
grated unit when opening the trunk lid or rear 
gate.

Does the display switch 
between OFF 

œ ON when 

trunk lid or rear gate is opened?

The trunk lid switch 
or rear gate latch 
switch circuit is 
OK.

Go to step 2.

2

CHECK CIRCUIT FOR TRUNK LID SWITCH 
OR REAR GATE LATCH SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of body 
integrated unit.
3) Disconnect the harness connector of the 
trunk lid switch or the rear gate latch switch.
4) Measure the resistance between harness 
connector terminals.

Connector & terminal

(i84) No. 17 — (D46) No. 2: (Wagon model)
(i84) No. 17 — (R186) No. 3: 
(Sedan model)

Is the resistance less than 10 

:? Go to step 3.

Repair or replace 
the harness.

3

CHECK GROUND CIRCUIT OF TRUNK LID 
SWITCH OR REAR GATE LATCH SWITCH.
1) Disconnect the harness connector of the 
trunk lid switch or the rear gate latch switch.
2) Measure the resistance between harness 
connector terminal and chassis ground.

Connector & terminal

(D46) No. 1 — Chassis ground: 
(Wagon model)
(R186) No. 1 — Chassis ground: 
(Sedan model)

Is the resistance less than 10 

:? Go to step 4.

Repair or replace 
the harness.

4

CHECK TRUNK LID SWITCH OR REAR 
GATE LATCH SWITCH.
1) Disconnect the harness connector of the 
trunk lid switch or the rear gate latch switch.
2) Measure the resistance between switch ter-
minals.

Terminals

No. 1 — No. 2: (Wagon model)
No. 1 — No. 3: (Sedan model)

Is the resistance 1 M

: or more 

when switch is pushed?

Go to step 5.

Replace the trunk 
lid lock assembly 
or rear gate latch 
assembly.

5

CHECK TRUNK LID SWITCH OR REAR 
GATE LATCH SWITCH.
Measure the resistance between switch termi-
nals.

Terminals

No. 1 — No. 2: (Wagon model)
No. 1 — No. 3: (Sedan model)

Is the resistance less than 1 

:

when switch is released?

Check the body 
integrated unit. 
<Ref. to 
LAN(diag)-2, Basic 
Diagnostic Proce-
dure.>

Replace the trunk 
lid lock assembly 
or rear gate latch 
assembly.

SL-32

Security System

SECURITY AND LOCKS

6. CHECK SECURITY INDICATOR LIGHT CIRCUIT

7. CHECK HORN

8. CHECK HAZARD LIGHT OPERATION

Refer to the hazard light operation check of the Keyless Entry System. <Ref. to SL-22, CHECK HAZARD
LIGHT OPERATION, INSPECTION, Keyless Entry System.>

Step

Check

Yes

No

1

CHECK SECURITY INDICATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of body 
integrated unit.
3) Connect the resistor (100 

:) between body 

integrated unit harness connector terminal (i84) 
No. 33 and chassis ground.

Connector & terminal

(i84) No. 33 — Chassis ground:

Does the security indicator light 
illuminate?

Check the body 
integrated unit. 
<Ref. to 
LAN(diag)-2, Basic 
Diagnostic Proce-
dure.>

Go to step 2.

2

CHECK POWER SUPPLY FOR SECURITY 
INDICATOR LIGHT.
1) Disconnect the connector from the combi-
nation meter.
2) Measure the voltage between the combina-
tion meter harness connector terminal and 
chassis ground.

Connector & terminal

(i10) No. 1 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step 3.

Check the harness 
for open or short 
circuits between 
combination meter 
and fuse.

3

CHECK SECURITY INDICATOR LIGHT CIR-
CUIT.
Measure the resistance between the combina-
tion meter harness connector terminal and the 
security control unit harness connector termi-
nal.

Connector & terminal

(i10) No. 17 — (i84) No. 33:

Is the resistance less than 10 

:? Replace the com-

bination meter. 
<Ref. to IDI-22, 
Combination 
Meter.>

Check the harness 
for open or short 
circuits between 
the combination 
meter and body 
integrated unit.

Step

Check

Yes

No

1

CHECK HORN OPERATION.
Check the horn sounds when the horn switch is 
pushed.

Does the horn sound?

Go to step 2.

Check the horn cir-
cuit. <Ref. to COM-
5, Horn Switch.>

2

CHECK OUTPUT TO HORN RELAY.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF) 
and run the “PC application for Subaru Select 
Monitor”.
3) On the «System Selection Menu» display, 
select the {Integ. unit mode}.
4) Select {Function check}.
5) Select {Horn Output} and execute

Does the horn sound?

Horn circuit is OK. Go to step 3.

3

CHECK HORN RELAY CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector of body 
integrated unit.
3) Disconnect the main fuse box harness con-
nector (B186).
4) Measure the resistance between harness 
connector terminals.

Connector & terminal

(B280) No. 11 — (B186) No. 1:

Is the resistance less than 10 

:? Check the body 

integrated unit. 
<Ref. to 
LAN(diag)-2, Basic 
Diagnostic Proce-
dure.>

Repair or replace 
the harness.