Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 774

LAN(diag)-5

Check List for Interview

LAN SYSTEM (DIAGNOSTICS)

3. CONDITIONS UNDER WHICH TROUBLE OCCURS

Driving condition

At standstill (While idling)
When the vehicle is running

Vehicle speed

km/h (MPH)

While 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 there any other troubles occurred?
From where:
TROUBLE SYMPTOM:

LAN(diag)-6

General Description

LAN SYSTEM (DIAGNOSTICS)

3. General Description

A: CAUTION

1. SUPPLEMENTAL RESTRAINT SYSTEM

“AIRBAG”

Airbag system wiring harness is routed near the

body integrated unit and twisted pair line.
CAUTION:

• Do not use the electrical test equipment on all

airbag system wiring harnesses and connec-

tors.

• Be careful not to damage the airbag system

wiring harness when servicing the body inte-

grated unit 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 characteristics of the twisted pair line are

changed, it may extremely weaken against 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

item which might affect body integrated unit mal-

functions.

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.

(Be sure to check the back-up fuse also.)

3) Check the connecting condition of harness and

harness connector.

4) Confirm settings of body integrated unit are cor-

responded to vehicle equipment. <Ref. to LAN(di-

ag)-20, REGISTRATION BODY INTEGRATED

UNIT (FUNCTION SETTING), OPERATION, Sub-

aru Select Monitor.>

5) Make sure that the User Customizing of the body

integrated unit matches the vehicle equipment.

<Ref. to LAN(diag)-23, USER CUSTOMIZING,

OPERATION, Subaru Select Monitor.>

6) Confirm “Factory or Market setting” of body inte-

grated unit registrations is “Market”.

7) Confirm key illumination does not blink with igni-

tion switch turned to ON.

(A) Bypass wire connection

(A) Soldering and protection with insulating tape

LAN00225

(A)

LAN00224

(A)

LAN(diag)-7

General Description

LAN SYSTEM (DIAGNOSTICS)

C: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

1B022XU0

SUBARU SELECT
MONITOR III KIT

Used for troubleshooting the electrical system.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

ST1B022XU0

LAN(diag)-8

Electrical Component Location

LAN SYSTEM (DIAGNOSTICS)

4. Electrical Component Location

A: LOCATION

(1)

Body integrated unit

(5)

Keyless entry control module

(9)

Combination meter

(2)

Engine control module (ECM)

(6)

A/C control panel

(10) Steering angle sensor

(3)

Auto A/C control module

(7)

Center display

(11) VDCCM&H/U (inside engine com-

partment)

(4)

Navigation unit

(8)

DCCD control module

LAN00338

(6)

(4)

(3)

(2)

(1)

(9)

(5)

(10)

(7)

(11)

(8)