Subaru 2009 IMPREZA Service Manual page 3417

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor. <Ref. to LAN(diag)-15,
READ DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
2 CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from body inte-
grated unit and keyless entry control module.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
3 CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from body inte-
grated unit and keyless entry control module.
3) Using the tester, inspect the open circuit of
harness and short (power supply-output short,
GND-output short).
Connector & terminal
(i84) No. 24 — (R80) No. 3:
4 CHECK HARNESS.
Using the tester, measure the voltage between
keyless entry control module and chassis
ground.
Connector & terminal
(R80) No. 4 (+) — Chassis ground (–):
5 CHECK OPERATION.
1) Install the keyless entry control module from
other vehicle, which is working normally.
2) Register the keyless key which is working
normally.
3) Operate the keyless key.
6 CHECK CONNECTOR.
Disconnect the connectors from body inte-
grated unit and keyless entry control module.
Check
Is B1500 current malfunction? Go to step 2.
Is B1500 current malfunction? Go to step 3.
Is harness normal?
Is the voltage battery voltage? Go to step 5.
Is the door locking operate?
Is there poor contact of connec-
tor?
LAN(diag)-84
Yes No
Go to step 6.
Go to step 6.
Go to step 4. Repair or replace
the harness.
Check the power
supply circuit for
keyless entry con-
trol module.
Replace the key- Replace the body
less entry control integrated unit.
module. <Ref. to <Ref. to SL-50,
SL-48, REMOVAL, REMOVAL, Body
Keyless Entry Con- Integrated Unit.>
trol Module.>
Repair the connec- Temporary poor
tor, or replace har- contact occurs.
ness.