Hi Mark. Some info on the B4 keys!
[/quote] "immob i l i s e r s e c u r i t y s y s t e m
The factory immobiliser system interfaces directly with the engine management computer (ECU).
This system is a transponder type that utilises a rolling code for additional security. Once the key is
inserted in the ignition lock and the ignition turned on an antenna amplifier positioned around the
ignition lock reads the transponder code and transmits it to the engine management and
immobiliser computer (ECU). The ECU then compares the transmitted code for the correct sequence
and, if correct, allows the engine to start. The remote central locking transmitter is now incorporated
as one unit into the key along with the immobiliser transponder.
If a duplicate key is required, the transponder code needs to be registered with the ECU. This teaching operation can only be performed
with special equipment and the software is only available to authorised personnel.
In addition to the factory immobiliser system all Liberty B4 are fitted as standard with a Subaru Australia designed Dual Stage Security
System. This system provides two separate security systems. The remote locking transmitter operates one system and the other by a PIN
operated keypad,This provides for additional six points of immobilisation, anti hijack mode, automatic re-arm, Intrusion Alert, False Alarm Prevention,
Internal Screamer, Infrasonic sensor, valet mode and also features anti cross pollination software for additional theft protection.[/quote]