Subaru Legacy IV (2008 year). Service manual - part 1109

SL-9

Door Lock Control System

SECURITY AND LOCKS

3

CHECK DOOR LOCK SWITCH.
1) Disconnect the door lock switch harness 
connector.
2) Use a tester and check the continuity when 
the door lock switch is operated to the LOCK 
side.

Connector & terminal

Driver’s side:

(D7) No. 4 — No. 7:

Passenger’s side:

(D125) No. 4 — No. 3:

Did the indicator change from 
“No continuity” (1 M

: or more) 

to “Continuity exists” (less than 
10 

:)?

Go to step 4.

Replace the power 
window main 
switch or door lock 
switch.

4

CHECK DOOR LOCK SWITCH.
Use a tester and check the continuity when the 
door lock switch is operated to the UNLOCK 
side.

Connector & terminal

Driver’s side:

(D7) No. 5 — No. 7:

Passenger’s side:

(D125) No. 1 — No. 3:

Did the indicator change from 
“No continuity” (1 M

: or more) 

to “Continuity exists” (less than 
10 

:)?

Go to step 5.

Replace the power 
window main 
switch or door lock 
switch.

5

CHECK HARNESS.
Use a tester to measure the resistance between 
the door lock switch harness connector and 
chassis ground.

Connector & terminal

Driver’s side:

(D7) No. 7 — chassis ground:

Passenger’s side:

(D125) No. 3 — Chassis ground:

Is the resistance less than 10 

:? Go to step 6.

Repair or replace 
the harness.

6

CHECK HARNESS.
1) Disconnect the harness connector of body 
integrated unit.
2) Measure the resistance between the body 
integrated unit and door lock switch.

Connector & terminal

Driver’s side:

(D7) No. 4 — (i84) No. 15:
(D7) No. 5 — (i84) No. 29:

Passenger’s side:

(D125) No. 4 — (i84) No. 15:
(D125) No. 1 — (i84) No. 29:

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

SL-10

Door Lock Control System

SECURITY AND LOCKS

4. CHECK DOOR LOCK ACTUATOR AND CIRCUIT

Step

Check

Yes

No

1

CHECK HARNESS (DOOR LOCK).
Check the harness for open or short circuits 
between body integrated unit and each door 
lock actuator.

Connector & terminal

(i84) No. 7 — (D72) No. 2: (front door LH)
(i84) No. 7 — (D18) No. 2: (front door RH)
(i84) No. 7 — (D26) No. 2: (rear door LH)
(i84) No. 7 — (D32) No. 2: (rear door RH)
(i84) No. 7 — (D47) No. 2: (rear gate)

Is harness normal?

Go to step 2.

Repair or replace 
the harness.

2

CHECK HARNESS (DOOR UNLOCK).
Check the harness for open or short circuits 
between body integrated unit and each door 
lock actuator.

Connector & terminal

(i84) No. 23 — (D72) No. 1: (front door LH)
(i84) No. 8 — (D18) No. 1: (front door RH)
(i84) No. 8 — (D26) No. 1: (rear door LH)
(i84) No. 8 — (D32) No. 1: (rear door RH)
(i84) No. 22 — (D47) No. 1: (rear gate)

Is harness normal?

Go to step 3.

Repair or replace 
the harness.

3

CHECK HARNESS (TRUNK UNLOCK).
Check the harness for open or short circuits 
between body integrated unit and trunk lid lock 
actuator.

Connector & terminal

(i84) No. 22 — (R186) No. 2:

Is harness normal?

Go to step 4.

Repair or replace 
the harness.

4

CHECK HARNESS (TRUNK UNLOCK).
Measure the resistance between the trunk lid 
lock actuator and chassis ground.

Connector & terminal

(R186) No. 1 — Chassis ground:

Is the resistance less than 10 

:? Go to step 5.

Repair or replace 
the harness.

5

CHECK BODY INTEGRATED UNIT OUTPUT 
SIGNAL.
Measure the voltage between the connector 
terminals of the body integrated unit when mov-
ing the door lock switch to LOCK.

Connector & terminal

Except for front door LH

(i84) No. 7 (+) — (i84) No. 8 (–):

Front door LH

(i84) No. 7 (+) — (i84) No. 23 (–):

Rear gate

(i84) No. 7 (+) — (i84) No. 22 (–):

Does the voltage change from 
less than 1.5 V 

o 10 V or 

more? (During lock output)

Go to step 6.

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

6

CHECK BODY INTEGRATED UNIT OUTPUT 
SIGNAL.
Measure the voltage between the connector 
terminals of the body integrated unit when mov-
ing the door lock switch to UNLOCK.

Connector & terminal

Except for front door LH

(i84) No. 8 (+) — (i84) No. 7 (–):

Front door LH

(i84) No. 23 (+) — (i84) No. 7 (–):

Rear gate

(i84) No. 22 (+) — (i84) No. 7 (–):

Does the voltage change from 
less than 1.5 V 

o 10 V or 

more? (During unlock output)

Go to step 7.

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

SL-11

Door Lock Control System

SECURITY AND LOCKS

5. CHECK SEDAN/WAGON IDENTIFICATION INPUT CIRCUIT

7

CHECK DOOR LOCK ACTUATOR.
Check the door lock actuator.
• Front door lock actuator <Ref. to SL-36, 
INSPECTION, Front Door Latch and Door Lock 
Actuator Assembly.>
• Rear door lock actuator <Ref. to SL-40, 
INSPECTION, Rear Door Latch and Door Lock 
Actuator Assembly.>

Is the door lock actuator OK?

Go to step 8.

Replace the door 
latch and door lock 
actuator assembly.

8

CHECK REAR GATE LOCK ACTUATOR.
Check the rear gate lock actuator. <Ref. to SL-
43, Rear Gate Latch Assembly.>

Is the rear gate lock actuator 
OK?

Temporary poor 
contact. Measure 
the resistance of 
harness connector 
between the body 
integrated unit and 
rear gate lock actu-
ator.

Replace the rear 
gate latch assem-
bly.

Step

Check

Yes

No

1

CONFIRM VEHICLE TYPE.
Confirm the vehicle type.

Is vehicle sedan?

Go to step 2.

Go to step 6.

2

CHECK CURRENT DATA.
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) Select the {Identification SW input} and con-
firm.

Is “ON” displayed?

Go to step 5.

Go to step 3.

3

CHECK IGNITION CIRCUIT.
Check the ignition switch circuit. <Ref. to SL-49, 
INSPECTION, Ignition Key Lock.>

Is the ignition circuit normal?

Go to step 4.

Replace the igni-
tion key lock. 

4

CHECK HARNESS.
1) Disconnect the harness connector of body 
integrated unit.
2) Measure the resistance between the body 
integrated unit harness connector and chassis 
ground.

Connector & terminal

(B281) No. 11 — Chassis ground:

Is it less than 10 

:?

Repair or replace 
the harness.

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

5

CHECK OPERATION.
1) Turn the ignition switch to ON.
2) LOCK/UNLOCK with the door lock switch.

Does trunk remain closed?

Identification input 
circuit is normal.

Check the trunk lid 
lock actuator. <Ref. 
to SL-10, CHECK 
DOOR LOCK 
ACTUATOR AND 
CIRCUIT, 
INSPECTION,
Door Lock Control 
System.>

Step

Check

Yes

No

SL-12

Door Lock Control System

SECURITY AND LOCKS

6

CHECK CURRENT DATA.
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) Select the {Identification SW input} and con-
firm.

Is “OFF” displayed?

Go to step 9.

Go to step 7.

7

CHECK IGNITION CIRCUIT.
Check the ignition switch circuit. <Ref. to SL-49, 
INSPECTION, Ignition Key Lock.>

Is the ignition circuit normal?

Go to step 8.

Replace the igni-
tion key lock. 

8

CHECK HARNESS.
1) Disconnect the harness connector of body 
integrated unit.
2) Measure the resistance between the body 
integrated unit harness connector and chassis 
ground.

Connector & terminal

(B281) No. 11 — Chassis ground:

Is it less than 10 

:?

Repair or replace 
the harness.

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

9

CHECK OPERATION.
1) Turn the ignition switch to ON.
2) LOCK/UNLOCK with the door lock switch.

Does the rear gate lock/unlock? Identification input 

circuit is normal.

Check the rear 
gate lock actuator. 
<Ref. to SL-10, 
CHECK DOOR 
LOCK ACTUATOR 
AND CIRCUIT, 
INSPECTION,
Door Lock Control 
System.>

Step

Check

Yes

No