Subaru Legacy (2005 year). Manual - part 974

SL-19

SECURITY AND LOCKS

Keyless Entry System

3. CHECK FUSE

4. CHECK KEYLESS ENTRY CONTROL MODULE

Step

Check

Yes

No

1

CHECK FUSE.
Remove and visually check the fuse No. 3 (in 
the fuse and relay box) and No. 7 (in the fuse 
and relay box).

Is the fuse blown out?

Replace the fuse 
with a new one.

Check the power 
supply and ground 
circuit. <Ref. to 
SL-20, CHECK 
BODY INTE-
GRATED MOD-
ULE POWER 
SUPPLY, 
GROUND CIR-
CUIT AND REG-
ISTERED 
CONNECTOR 
CIRCUIT, 
INSPECTION, 
Keyless Entry Sys-
tem.>

Step

Check

Yes

No

1

CHECK DIAGNOSTIC TROUBLE CODE 
(DTC)
1) Connect the Subaru Select Monitor to data 
link connector.
2) Turn the ignition switch to ON.
3) Select {Integ 

⋅ unit} from main menu.

4) Select the {Diagnostic Trouble Code}.
5) Check that the DTC is displayed.

Is DTC B0500 “Keyless UART 
com. Malfunction” displayed?

Go to step 2.

Keyless entry con-
trol module is nor-
mal.

2

CHECK POWER SUPPLY.
1) Disconnect the keyless entry control mod-
ule harness connector.
2) Measure the voltage between the harness 
connector terminal and chassis ground.

Connector & terminal

(i96) No. 4 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Check the harness 
for open circuits 
and shorts 
between the key-
less entry control 
module and fuse.

3

CHECK GROUND CIRCUIT.
Measure the resistance between the harness 
connector terminal and chassis ground.

Connector & terminal

(i96) No. 7 — Chassis ground:

Is the resistance less than 10 
Ω?

Go to step 4.

Repair the har-
ness.

4

CHECK KEYLESS ENTRY CONTROL MOD-
ULE CIRCUIT.
1) Disconnect harness connector of body inte-
grated module.
2) Measure the resistance between harness 
connector terminals.

Connector & terminal

(i84) No. 9 — (i96) No. 3:

Is the resistance less than 10 
Ω?

Replace the key-
less entry control 
module. <Ref. to 
SL-43, Keyless 
Entry Control 
Unit.>

Repair the har-
ness.

SL-20

SECURITY AND LOCKS

Keyless Entry System

5. CHECK BODY INTEGRATED MODULE POWER SUPPLY, GROUND CIRCUIT AND REGIS-
TERED CONNECTOR CIRCUIT

6. CHECK REGISTRATION CONNECTOR.

Step

Check

Yes

No

1

CHECK REGISTRATION CONNECTOR IN-
PUT VOLTAGE.
Measure the voltage between the body inte-
grated module harness connector and chassis 
ground.

Connector & terminal

(B281) No. 22 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 2.

Check the registra-
tion connector for 
disconnection, and 
the harness for 
short.

2

CHECK POWER SUPPLY OF BODY INTE-
GRATED MODULE.
1) Disconnect the harness connector of body 
integrated module.
2) Measure the voltage between the harness 
connector terminal and chassis ground.

Connector & terminal

(B280) No. 7 (+) — Chassis ground (

−

):

(B281) No. 2 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Check the harness 
for open or short 
between body inte-
grated module and 
fuse.

3

CHECK BODY INTEGRATED MODULE 
GROUND CIRCUIT.
1) Disconnect the harness connector of body 
integrated module.
2) Measure the resistance between the har-
ness connector terminal and chassis ground.

Connector & terminal

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

Is the resistance less than 10 
Ω?

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

Repair the har-
ness.

Step

Check

Yes

No

1

CHECK REGISTRATION CONNECTOR IN-
PUT VOLTAGE.
1) Disconnect the registration connector.
2) Measure the voltage between the body 
integrated module harness connector and 
chassis ground.

Connector & terminal

(B281) No. 22 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 2.

Repair the har-
ness.

2

CHECK REGISTRATION CONNECTOR IN-
PUT VOLTAGE.
1) Connect the registration connector.
2) Measure the voltage between the body 
integrated module harness connector and 
chassis ground.

Connector & terminal

(B281) No. 22 (+) — Chassis ground (

−

):

Is the voltage 0 V?

Registration con-
nector circuit is 
OK.

Repair the har-
ness.

SL-21

SECURITY AND LOCKS

Keyless Entry System

7. CHECK DOOR SWITCH

Step

Check

Yes

No

1

CHECK DOOR SWITCH CIRCUIT.
Measure the voltage between the body inte-
grated module harness connector terminal and 
chassis ground.

Connector & terminal
Front door RH:

LHD model

(i84) No. 32 (+) — Chassis ground (

−

):

RHD model

(i84) No. 19 (+) — Chassis ground (

−

):

Front door LH:

LHD model

(i84) No. 19 (+) — Chassis ground (

−

):

RHD model

(i84) No. 32 (+) — Chassis ground (

−

):

Rear door RH:

(i84) No. 18 (+) — Chassis ground (

−

):

Rear door LH:

(i84) No. 31 (+) — Chassis ground (

−

):

Rear gate:

(i84) No. 17 (+) — Chassis ground (

−

):

Is the voltage 0 V when each 
door or rear gate is opened?

Go to step 2.

Go to step 3.

2

CHECK DOOR SWITCH CIRCUIT.
Measure the voltage between the body inte-
grated module harness connector terminal and 
chassis ground.

Connector & terminal
Front door RH:

LHD model

(i84) No. 32 (+) — Chassis ground (

−

):

RHD model

(i84) No. 19 (+) — Chassis ground (

−

):

Front door LH:

LHD model

(i84) No. 19 (+) — Chassis ground (

−

):

RHD model

(i84) No. 32 (+) — Chassis ground (

−

):

Rear door RH:

(i84) No. 18 (+) — Chassis ground (

−

):

Rear door LH:

(i84) No. 31 (+) — Chassis ground (

−

):

Rear gate:

(i84) No. 17 (+) — Chassis ground (

−

):

Is the voltage more than 10 V 
when each door or rear gate is 
closed?

The door switch is 
OK.

Go to step 3.

3

CHECK DOOR SWITCH.
1) Disconnect the door switch harness con-
nector.
2) Measure the resistance between door 
switch terminals.

Connector & terminal

(R12) Front RH door switch:
(R9) Front LH door switch:
(R16) Rear RH door switch:
(R22) Rear LH door switch:
No. 1 — No. 3:
Rear gate latch switch (Wagon model): 
(D46) No. 1 — No. 2:

Is the resistance more than 1 
M

Ω when door switch is 

pushed?

Go to step 4.

Replace the door 
switch.

SL-22

SECURITY AND LOCKS

Keyless Entry System

8. CHECK KEY WARNING SWITCH

4

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

Connector & terminal

(R12) Front RH door switch:
(R9) Front LH door switch:
(R16) Rear RH door switch:
(R22) Rear LH door switch:
No. 1 — No. 3:
Rear gate latch switch (Wagon model): 
(D46) No. 1 — No. 2:

Is the resistance less than 1 

Ω 

when door switch is released?

Check the harness 
for open or short 
between body inte-
grated module and 
door switch.

Replace the door 
switch.

Step

Check

Yes

No

1

CHECK FUSE.
Remove and visually check the fuse No. 14 (in 
the main fuse box).

Is the fuse blown out?

Replace the fuse 
with a new one.

Go to step 2.

2

CHECK KEY WARNING SWITCH CIRCUIT.
1) Disconnect the harness connector of body 
integrated module.
2) Insert the key into ignition switch. (LOCK 
position)
3) Measure the voltage between the harness 
connector terminal and chassis ground.

Connector & terminal

(B281) No. 7 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Go to step 4.

3

CHECK KEY WARNING SWITCH CIRCUIT.
1) Remove the key from ignition switch.
2) Measure the voltage between the harness 
connector terminal and chassis ground.

Connector & terminal

(B281) No. 7 (+) — Chassis ground (

−

):

Is the voltage 0 V?

The key warning 
switch is OK.

Go to step 4.

4

CHECK KEY WARNING SWITCH.
1) Disconnect the key warning switch harness 
connector.
2) Insert the key into ignition switch. (LOCK 
position)
3) Measure the resistance between key warn-
ing switch terminals.

Connector & terminal

(B350) No. 3 — No. 4:

Is the resistance less than 1 
Ω?

Go to step 5.

Replace the key 
warning switch.

5

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

Connector & terminal

(B350) No. 3 — No. 4:

Is the resistance more than 1 
M

Ω?

Check the follow-
ing:

• Harness for 
open circuits 
and shorts 
between the 
key warning 
switch and fuse
• Harness for 
open or short 
between the 
body integrated 
module and key 
warning switch

Replace the key 
warning switch.

Step

Check

Yes

No