Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 792

LAN(diag)-77

General Diagnostic Table

LAN SYSTEM (DIAGNOSTICS)

13.General Diagnostic Table

A: INSPECTION

Item

Operation

Specifications

Note

YES

NO

Diagnostic code

DTC is not displayed when inspect-
ing all DTCs.

System is normal.

Perform the diag-
nosis according to
DTC.

—

Engine coolant
temperature

Engine coolant temperature gauge
displays correctly without engine
coolant temperature warning light
illuminating/blinking.

System is normal.

Refer to the follow-
ing to check.
• Engine cooling
system
• LAN system

If two data values are dif-
ferent when display the
current data of ECM and
body integrated unit, it is
possible that driving sys-
tem CAN is malfunction.

Remaining fuel
level

Fuel gauge displays correctly. Fuel
level warning light does not remain
illuminated.

System is normal.

Refer to the follow-
ing to check.
• Combination
meter system
• LAN system

If the values of “Fuel level
resistance” and “Fuel level
resistance 2” are different
when display the current
data of body integrated
unit, it is possible that
body integrated unit is
malfunction.

EBD warning light
ABS warning light
VDC warning light
Hill start assist
warning light

EBD warning light/ABS warning
light/VDC warning light/Hill start
assist warning light are free from
ON/OFF all the time.

System is normal.

Refer to the follow-
ing to check.
• VDC (diagnos-
tics)
• Parking brake
• Combination
meter system
• LAN system

—

Clearance light
Low beam
High beam

Clearance light/low beam/high
beam illuminate correctly by switch
operation. Indicator in the meter illu-
minates when clearance light/high
beam are illuminating.

System is normal.

Refer to the follow-
ing to check.
• Lighting system
• Combination
meter system
• LAN system

—

Fog light

Fog light illuminates correctly by
switch operation. Indicator in the
meter illuminates when each fog
light is illuminating.

System is normal.

Refer to the follow-
ing to check.
• Lighting system
• Combination
meter system
• LAN system

—

DRL

DRL operates correctly.

System is normal.

Refer to the follow-
ing to check.
• Lighting system
• LAN system

—

Key warning switch
alarm

Alarm sounds when drivers door is
open with the key inserted.

System is normal.

Refer to the follow-
ing to check.
• Combination
meter system
• LAN system

—

LAN(diag)-78

General Diagnostic Table

LAN SYSTEM (DIAGNOSTICS)

Seat belt warning
alarm

Indicator in the meter illuminate and
alarm sounds when driver’s seat
belt is not worn.
Indicator in the clock illuminates.
When passenger’s seat is occupied
without passenger’s seat belt worn.
Alarm sounds when vehicle speed
is approx. 15 km/h without seat belt
fastened.

System is normal.

Refer to the follow-
ing to check.
• Seat belt warn-
ing system
• Combination
meter system
• LAN system

—

Rear window
defogger

Rear window defogger operates by
operating the switch.
Indicator in the switch illuminates
when rear window defogger is oper-
ating.

System is normal.

Refer to the follow-
ing to check.
• Rear window
defogger
• A/C control mod-
ule

—

Wiper deicer

Wiper deicer operates by operating
the switch.
(When the outside temperature is
5°C or higher, press the switch for
three seconds or more to operate
forcibly, otherwise the wiper deicer
operation will be canceled.)

System is normal.

Refer to the follow-
ing to check.
• Wiper deicer
system
• A/C control mod-
ule

—

Rear wiper

Rear wiper operates by operating
the switch.

System is normal.

Refer to the follow-
ing to check.
• Wiper and
washer system

Vehicle speed response
time varies depending on
the condition of customi-
zation of the body inte-
grated unit “Sedan/Wagon
Setting”.

Door lock

Lock/unlock operates by operating
the central door lock switch.
Rear gate opens by operating the
rear gate opener button.

System is normal.

Refer to the follow-
ing to check.
• Security and
locks
• LAN system

Rear gate cannot open by
operating the rear gate
opener button when cus-
tomization of the body
integrated unit “Sedan/
Wagon Setting” is set to
“Sedan”.

Keyless entry

Lock/unlock operates by operating
the keyless transmitter.

System is normal.

Refer to the follow-
ing to check.
• Security and
locks
• LAN system

Rear gate swung to open
by operating the trunk/rear
gate unlock button when
customization of the body
integrated unit “Sedan/
Wagon Setting” is set to
“Sedan”.

Hazard lights

Answer back operates by operating
lock/unlock with the keyless entry.

System is normal.

Refer to the follow-
ing to check.
• Security and
locks
• LAN system

—

Room light

ON/OFF according to the door
open/close operation, the lock/
unlock operation with the keyless
entry, and the ignition operation.

System is normal.

Refer to the follow-
ing to check.
• Room light sys-
tem
• Security and
locks
• LAN system

—

Item

Operation

Specifications

Note

YES

NO

LAN(diag)-79

General Diagnostic Table

LAN SYSTEM (DIAGNOSTICS)

Map light
(model with sun-
roof)

ON/OFF according to the door
open/close operation except rear
gate, the lock/unlock operation with
the keyless entry, and the ignition
operation.

System is normal.

Refer to the follow-
ing to check.
• Spot map light
• Security and
locks
• LAN system

—

Key illumination

ON/OFF according to the driver’s
door open/close operation, the lock/
unlock operation with the keyless
entry, and the ignition operation.

System is normal.

Refer to the follow-
ing to check.
• Ignition switch
illumination
• Security and
locks
• LAN system

Key illumination blinks
when customization of the
body integrated unit “Fac-
tory initial setting” is set to
“Factory” for models with
keyless entry.

Illumination control Illumination volume control is avail-

able.

System is normal.

Refer to the follow-
ing to check.
• Combination
meter system
• LAN system

Lighting adjustment is not
possible when customiza-
tion of the body integrated
unit “Illumination Control
On/Off” is set to “OFF”.

Engine start

Engine starts normally.

System is normal.

Refer to the follow-
ing to check.
• Engine (diagnos-
tics)
• Immobilizer
• LAN system

—

Vehicle security

When locked by the keyless entry,
security monitor condition starts.
When unlocked by the keyless
entry, security is released.

System is normal.

Refer to the follow-
ing to check.
• Security and
locks
• LAN system

When the “Impact sensor”
setup is set to “ON” with-
out connecting the impact
sensor (dealer option), the
alarm operates as soon as
security monitor condition
occurs.

Item

Operation

Specifications

Note

YES

NO

2014 IMPREZA WRX STI SERVICE MANUAL

QUICK REFERENCE INDEX

FUJI HEAVY INDUSTRIES LTD.

G1180BE8

WIRING SYSTEM SECTION

This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.

All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.

WIRING SYSTEM

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