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