Subaru Legacy (2005 year). Manual - part 1031

LAN(diag)-3

LAN SYSTEM (DIAGNOSTICS)

Check List for Interview

2. Check List for Interview

A: CHECK

Inspect the following items about the vehicle’s state.

1. DISPLAY OF COMMUNICATION ERROR

2. DISPLAY IN COMBINATION METER

Communication error is 
displayed in odo/trip meter.

When and how often are they displayed?
❏ Always

❏ Sometimes

❏ Only once
Which communication error is displayed? (Record them all)
❏ Er IU (Fail in the body integrated module)

❏ Er HC (Fail of high-speed CAN)

❏ Er LC (Fail of low-speed CAN)

❏ Er −− (Fails of both high-speed and low-speed CAN)

❏ Er EG (Fail of EGI communication counter)

❏ Er TC (Fail of TCM communication counter)

❏ Er Ab (Fail of vehicle dynamics control (VDC)/ABS communication counter)

Ignition key position

❏ OFF

❏ ACC

❏ ON (before starting engine)

❏ START

❏ ON (after engine starting, engine is running)

❏ ON (after engine starting, engine is at a standstill)

Timing

❏ Immediately after turning the ignition to ON

❏ Immediately after turning the ignition to START

Display in combination 
meter

a) Display of engine coolant temperature gauge

❏ OK / ❏ NG

b) Display of fuel gauge

❏ OK / ❏ NG

Center display

c) Display of ambient temperature

❏ OK / ❏ NG

Display of other indicators

d) Malfunction indicator light

❏ ON / ❏ OFF 

e) SPORT indicator light (AT warning light)

❏ ON / ❏ OFF 

f) ABS warning light/Vehicle dynamics control (VDC) warning 
light

❏ ON / ❏ OFF 

g) Immobilizer indicator light

❏ ON / ❏ Blink / ❏ OFF

h) Seat belt warning light (Driver’s seat)

❏ ON / ❏ OFF 

i) Seat belt warning light (Passenger’s seat)

❏ ON / ❏ OFF 

LAN(diag)-4

LAN SYSTEM (DIAGNOSTICS)

Check List for Interview

3. SYMPTOMS

4. CONDITIONS UNDER WHICH TROUBLE OCCURS

Behavior of vehicle

a) Illumination volume control does not function.

❏ Yes / ❏ No

b) Rear wiper does not operate.

❏ Yes / ❏ No

c) Wiper deicer does not operate.

❏ Yes / ❏ No

d) Rear defogger does not operate.

❏ Yes / ❏ No

e) Door lock does not operate.

❏ Yes / ❏ No

f) Trunk/rear gate lock does not operate.

❏ Yes / ❏ No

g) Driver’s door lock does not operate.

❏ Yes / ❏ No

h) Shift lock does not operate.

❏ Yes / ❏ No

i) Rear fog light does not come on.

❏ Yes / ❏ No

j) Double lock does not operate. (EK model)

❏ Yes / ❏ No

k) Heater cock valve does not operate.

❏ Yes / ❏ No

l) Key illumination blinks.

❏ Yes / ❏ No

Driving condition

❏ At standstill (While idling)
❏ When the vehicle is running

Vehicle speed

km/h (MPH)

❏ When accelerating

Acceleration

km/h (MPH) to

km/h (MPH)

❏ Decelerating (With braking)

Deceleration

km/h (MPH) to

km/h (MPH)

❏ Decelerating (Without braking)

Deceleration

km/h (MPH) to

km/h (MPH)

❏ Flat road

❏ Uphill

❏ Downhill

❏ Gravel road

❏ Bumpy road

❏ Snowy road
Does it occur when operating any part?
Operated part:
Trouble symptom:

Are other troubles occurred?
From where:
Trouble symptom:

LAN(diag)-5

LAN SYSTEM (DIAGNOSTICS)

General Description

3. General Description

A: CAUTION

1. SUPPLEMENTAL RESTRAINT SYSTEM 
“AIRBAG”

Airbag system wiring harness is routed near the
body integrated module and twisted pair line.

CAUTION:
• All airbag system wiring harness and con-
nectors are colored yellow. Do not use the elec-
trical test equipment on these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the body inte-
grated module and LAN system.

2. LAN SYSTEM

• Bus line of LAN system is twisted pair line. Be
careful not to bypass or partly unbind the twisted
pair line.
• Do not make clearance between bus lines (CAN
High, CAN Low).
• Difference of bus line length should be within 10
cm (3.94 in).
• Fray near the connector should be within 8 cm
(3.14 in).

• If the characteristic of twisted pair line is
changed, it may extremely weaken against the
noise.

• When repairing the harness, connect the wires
using soldering and protect it with insulating tape,
etc.

B: INSPECTION

Before performing diagnostics, check the following
items which might affect body integrated module
malfunctions.
1) Measure the battery voltage and check electro-
lyte.

Standard voltage: 12 V or more

Specific gravity: 1.260 or more
2) Check the fuse condition.
Make sure that ampere of the fuse is setting value,
and it is not blown out.
3) Check the connecting condition of harness and
harness connector.
4) Confirm settings of body integrated module are
corresponded to vehicle equipment. <Ref. to
LAN(diag)-18, REGISTRATION BODY INTE-
GRATED MODULE (EQUIPMENT SETTING), OP-
ERATION, Subaru Select Monitor.>
5) Confirm setting are corresponded to vehicle
equipment by function setting (ECM customizing)
of body integrated module. <Ref. to LAN(diag)-20,
FREEZE FRAME DATA, OPERATION, Subaru
Select Monitor.>
6) Confirm “Factory initial setting” of body integrat-
ed module registrations is “Market”.
7) Confirm key illumination does not blink with igni-
tion switch turned to ON.

(A) Bypass wire connection

LAN00081

(A)

(A) Soldering and protection with insulating tape

LAN00080

(A)

LAN(diag)-6

LAN SYSTEM (DIAGNOSTICS)

General Description

C: PREPARATION TOOL

1. SPECIAL TOOL 

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

18482AA000

(Newly adopted tool)

CARTRIDGE

Troubleshooting for electrical system.

22771AA030

SUBARU SELECT 
MONITOR KIT

Troubleshooting for electrical system.
• English: 22771AA030 (Without printer)
• German: 22771AA070 (Without printer)
• French: 22771AA080 (Without printer)
• Spanish: 22771AA090 (Without printer)

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

ST18482AA000

ST22771AA030