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June 2013
Electrical Systems Operation & Diagnosis Module (602)
BIU
The result sent from the combination meter is
stored in the BIU until the Engine control module
has requested a decision to allow the engine to
operate or to turn off the injectors and shut the
engine off.
Key
The vehicle is shipped with two keys (May
change by model and year). Both keys contain
a transponder that is registered to the vehicle.
One key is the master key and the other key is
the valet key. The only functional difference is
that the valet key will not open the trunk lock.
Also shipped with the vehicle, on the key ring,
are two metal tags.
ı
ˇ
A
B
A) Key number plate
B) Security ID plate
Key Tags
The smaller tag is the mechanical key code. This
is what the customer would use to have another
key cut for the vehicle. The larger tag is the
security code for the Immobilizer. This number
must be available to the Technician when the
vehicle Immobilizer system and its components
are being serviced.
A key can only be registered to one vehicle. A
vehicle may have up to four keys registered to
it. The registration process, once started, clears
the BIU of all keys. This means that when one
key is registered, they all must be registered. The
registration process is accomplished using the
Subaru Select Monitor III.
BIU
Replacing the BIU requires that all the keys be
replaced. The new keys must be registered to
the vehicle and the new BIU (2005-2009).
Note: The Keys do NOT need to be
replaced when changing the BIU
for 2010 Legacy and newer and
2011 Forester and newer.
BIU (ARTWORK)
Note: The installation of a new
BIU requires that all keyless
transmitters be reprogrammed to
the vehicle. The BIU customizing
features must be set at this time.
If possible record the current
settings of the BIU before
replacement. If the current
settings cannot be obtained ask
the customer to provide you with
their selections.
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