Subaru 2009 Impreza Navigation System - Manual (Page 222)

222 Handsfree
Other Bluetooth settings
Changing the Pass-Key used when certificating the Bluetooth Phone
When connecting the Bluetooth Phone to the in-vehicle
equipment, the Pass-key is used for certification. It is possible
to change the Pass-Key used for certification.
1
Press the button.
2
Select (Phone).
3
Select (Bluetooth Settings).
4
Select (My Info).
5
Select (Pass-key).