Subaru Legacy IV (2008 year). Manual - part 1108

SL-5

General Description

SECURITY AND LOCKS

4. IMMOBILIZER SYSTEM

5. KEYLESS ENTRY SYSTEM

(1)

Antenna

(3)

Body integrated unit

(4)

Transponder

(2)

Security indicator light (LED bulb)

 

 

 

 

(1)

Keyless entry control module

(3)

Door switch

(5)

Horn

(2)

Rear gate latch switch (wagon 
model), Trunk lid switch (sedan 
model)

(4)

Body integrated unit

(6)

Keyless buzzer

(2)

(4)

(1)

(3)

SL-00686

SL-00702

(3)

(2)

(4)

(1)

(5)

(6)

SL-6

General Description

SECURITY AND LOCKS

B: CAUTION

• Before disassembling or reassembling parts, always disconnect the battery ground cable from battery.
When repairing the audio, control module, etc. which are provided with memory functions, record the mem-
ory contents before disconnecting the ground cable from battery. Otherwise, these contents are erased upon
disconnection.
• Reassemble the parts in the reverse order of disassembly unless otherwise indicated.
• Adjust the parts to the specifications described in this manual if so designated.
• Connect the connectors securely during reassembly.
• After reassembly, make sure all the functional parts operate smoothly.
• The airbag system wiring harness is routed near electrical parts and switches.
• Do not use the electrical test equipment on the airbag system wiring harnesses and connector circuits.
• Be careful not to damage the airbag system wiring harness when servicing the ignition key cylinder.

C: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

1B022XU0

SUBARU SELECT 
MONITOR III KIT

Used for setting of each function and trouble-
shooting for electrical system.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance and voltage.

Drill

Used for replacing ignition key lock.

Clip remover

Used for removing trim clip

Clip clamp pliers

Used for removal of various clips and clamps.

ST1B022XU0

SL-7

Door Lock Control System

SECURITY AND LOCKS

2. Door Lock Control System

A: WIRING DIAGRAM

1. DOOR LOCK CONTROL

For wiring diagrams related to the door lock control system, refer to “Keyless Entry System” in Section WI.
<Ref. to WI-190, WIRING DIAGRAM, Keyless Entry System.>

B: ELECTRICAL SPECIFICATION

1. BODY INTEGRATED UNIT

Refer to the Control Module I/O Signal of the LAN SYSTEM (DIAGNOSTICS). <Ref. to LAN(diag)-9, ELEC-
TRICAL SPECIFICATION, Control Module I/O Signal.>

C: INSPECTION

1. SYMPTOM CHART

Symptom

Repair order

Reference

The door lock control system does 
not operate.

1. Remove and visually check the fuse No. 3 (in 
the fuse & relay box) and No. 7 (in the fuse & relay 
box).

If the fuse is blown out, replace the 
fuse with a new part.
When there is no defective with the 
fuse, check the power supply and 
ground circuit. <Ref. to SL-8, 
CHECK POWER SUPPLY AND 
GROUND CIRCUIT, INSPECTION, 
Door Lock Control System.>

2. Check the power supply and ground circuit for 
body integrated unit.

<Ref. to SL-8, CHECK POWER 
SUPPLY AND GROUND CIRCUIT, 
INSPECTION, Door Lock Control 
System.>

3. Check the door lock switch and the circuit.

<Ref. to SL-8, CHECK DOOR LOCK 
SWITCH, INSPECTION, Door Lock 
Control System.>

4. Check the door lock actuator and the circuit.

<Ref. to SL-10, CHECK DOOR 
LOCK ACTUATOR AND CIRCUIT, 
INSPECTION, Door Lock Control 
System.>

A specific door lock actuator does not 
operate. (except for trunk)

Check the door lock actuator and circuit.

<Ref. to SL-10, CHECK DOOR 
LOCK ACTUATOR AND CIRCUIT, 
INSPECTION, Door Lock Control 
System.>

Trunk/rear gate does not operate nor-
mally when the door lock switch is 
operated. (Trunk

o Opened by 

UNLOCK operation) (Rear gate

o

Does not operate by LOCK/UNLOCK 
operation)

Check the sedan/wagon identification input circuit.

<Ref. to SL-11, CHECK SEDAN/
WAGON IDENTIFICATION INPUT 
CIRCUIT, INSPECTION, Door Lock 
Control System.>

SL-8

Door Lock Control System

SECURITY AND LOCKS

2. CHECK POWER SUPPLY AND GROUND CIRCUIT

3. CHECK DOOR LOCK SWITCH

Step

Check

Yes

No

1

CHECK POWER SUPPLY OF BODY INTE-
GRATED UNIT.
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}.
5) Check the following data display.

Is the data display 10 V or more 
(BATT voltage (Control), BATT 
voltage (BACKUP))?

Body integrated 
unit is normal.

Go to step 2.

2

CHECK POWER SUPPLY.
1) Disconnect the harness connector of body 
integrated unit.
2) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

(i84) No. 34 (+) — Chassis ground (–):
(B280) No. 7 (+) — Chassis ground (–):
(B281) No. 2 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step 3.

Check the harness 
for open or short 
circuit between 
body integrated 
unit and fuse.

3

CHECK GROUND CIRCUIT.
Measure the resistance between harness con-
nector terminal and chassis ground.

Connector & terminal

(i84) No. 21 — Chassis ground:
(B280) No. 22 — Chassis ground:
(B281) No. 8 — Chassis ground:
(B281) No. 9 — Chassis ground:

Is the resistance less than 10 

:? Replace the body 

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

Repair or replace 
the harness.

Step

Check

Yes

No

1

CHECK DOOR LOCK SWITCH.
Check the input from door lock switch to body 
integrated unit using Subaru Select Monitor.
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) On the «System Selection Menu» display, 
select the {Integ. unit mode}. Select the {Cur-
rent Data Display & Save}.
5) On the «System Selection Menu» display, 
select the {Integ. unit mode}. Select the {Cur-
rent Data Display & Save}. Operate the door 
lock switches (driver’s seat and passenger’s 
seat) in the LOCK direction, and check the input 
of {Manual lock SW input}.

Does the display switch 
between OFF 

œ ON when 

each door lock switch is moved 
to LOCK?

Go to step 2.

Go to step 3.

2

CHECK DOOR LOCK SWITCH.
From the condition in step 1), check the {Manual 
unlock SW input} input by operating each door 
lock switch (driver’s and passenger’s) in the 
UNLOCK direction.

Does the display switch 
between OFF 

œ ON when 

each door lock switch is moved 
to UNLOCK?

The door lock 
switch is OK.

Go to step 4.