Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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-
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)
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