Subaru Legacy (2005 year). Service manual — part 1050

LAN(diag)-79

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

W: DTC B0321 CAN-LS METER NO-RECEIVE DATA

DTC DETECTING CONDITION:
Combination meter unit error, or harness between the main harness splice and combination meter unit is
open or shorted, the connector is not connected securely and the terminal has poor caulking.
TROUBLE SYMPTOM:
Fail mode occurs because the data is not received from combination meter unit.
WIRING DIAGRAM:

i77

2

8

7

1

i10

21

22

i84

27

26

LAN00176

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

2 3 4 5

6 7 8 9

12 13 14 15 16 17 18 19 20 21 22

10

1

11

i84

CAN JOINT
CONNECTOR

TWISTED WIRE

i10

COMBINATION METER

BODY INTEGRATED

MODULE

i77

1 2 3 4 5 6 7 8 9 10 11 12

LAN(diag)-80

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK COMMUNICATION LINE.
1) Warm up the engine.
2) Compare the data of body integrated mod-
ule and combination meter using Subaru
Select Monitor.
Check item:
• Engine speed
• Each door switch
• P switch

Is the data displayed same?

Go to step 2.

Perform the self-
diagnosis for com-
bination meter.
<Ref. to IDI-3,
SELF-DIAGNO-
SIS, INSPEC-
TION,
Combination
Meter System.>

2

CHECK HARNESS.
1) Disconnect the body integrated module
connector and combination meter connector.
2) Measure the resistance between body inte-
grated module connector and combination
meter connector.

Connector & terminal

(i10) No. 21 — (i84) No. 27:
(i10) No. 22 — (i84) No. 26:

Is the resistance less than 10
Ω?

Go to step 4.

Go to step 3.

3

CHECK HARNESS.
1) Disconnect the CAN joint connector with
connector of unit disconnected.
2) Measure the resistance between body inte-
grated module connector and CAN joint con-
nector.

Connector & terminal

(i10) No. 21 — (i77) No. 1:
(i10) No. 26 — (i77) No. 7:
(i84) No. 27 — (i77) No. 2:
(i84) No. 26 — (i77) No. 8:

Is the resistance less than 10
Ω?

Go to step 4.

Repair or replace
the open circuit of
harness.

4

CHECK HARNESS.
Measure the resistance between CAN joint
connector and chassis ground.

Connector & terminal

(i77) No. 1 — Chassis ground:
(i77) No. 7 — Chassis ground:
(i77) No. 2 — Chassis ground:
(i77) No. 8 — Chassis ground:

Is the resistance less than 10
Ω?

Repair or replace
the short circuit of
harness.

Go to step 5.

5

CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between CAN joint
connector and chassis ground.

Connector & terminal

(i77) No. 1 (+) — Chassis ground (

−

):

(i77) No. 7 (+) — Chassis ground (

−

):

(i77) No. 2 (+) — Chassis ground (

−

):

(i77) No. 8 (+) — Chassis ground (

−

):

Is the voltage more than 6 V?

Repair or replace
the short circuit of
harness.

Go to step 6.

6

CHECK COMBINATION METER.
Perform the self-diagnosis for combination
meter. <Ref. to IDI-3, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>

Is the self-diagnosis OK?

Temporary poor
contact occurs.

Check the connec-
tion of connector.
Replace the com-
bination meter.
<Ref. to IDI-15,
Combination
Meter.>

LAN(diag)-81

LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

X: DTC B0500 KEYLESS UART COM. MALFUNCTION

DTC DETECTING CONDITION:
UART between the keyless control unit and body integrated module is open or shorted, or the connector is
not connected securely and the terminal has poor caulking.
TROUBLE SYMPTOM:
Door lock does not operate with keyless.
WIRING DIAGRAM:

LAN00178

FB-10

M/B FUSE No.28

(P)

1

5

4

3

7

9

A4

15

i84

i83

i82

i97

i96

E

i84

i96

i97

i82

i83

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

10 11 12

3 4
9

5 6

1
7

2
8

1 2 3 4
5 6 7 8

GROUND JOINT
CONNECTOR

BODY
INTEGRATED
MODULE

REF.TO POWER SUPPLY ROUTING

KEYLESS ENTRY

CONTROL MODULE

ILLMINATION & BACK-UP
JOINT CONNECTOR

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LAN SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS.
1) Disconnect the body integrated module
connector and keyless entry control module
connector.
2) Measure the resistance between body inte-
grated module connector and keyless entry
control module connector.

Connector & terminal

(i84) No. 9 — (i96) No. 3:

Is the resistance less than 10
Ω?

Go to step 2.

Repair or replace
the open circuit of
harness.

2

CHECK HARNESS.
Measure the resistance between body inte-
grated module connector and chassis ground.

Connector & terminal

(i84) No. 9 — Chassis ground:

Is the resistance less than 1
M

Ω?

Repair or replace
the short circuit of
harness.

Go to step 3.

3

CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between body inte-
grated module connector and chassis ground.

Connector & terminal

(i84) No. 9 (+) — Chassis ground (

−

):

Is the voltage more than 6 V?

Repair or replace
the short circuit of
harness.

Go to step 4.

4

OPERATION CHECK.
Check the door lock operation when the doors
LOCK/UNLOCK using manual LOCK switch.

Does it operate on switch oper-
ation?

Go to step 5.

Replace the body
integrated mod-
ule. <Ref. to SL-
44, Body Inte-
grated Module.>

5

OPERATION CHECK.
1) Disconnect the key warning switch connec-
tor (B350).
2) Close all the doors, and then perform the
LOCK/UNLOCK operation on keyless entry
operation.

Does it operate?

Check key warning
switch.

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