installing after market radio, which interface do i need?

[ffl]

i have a h2 2004 and replaced the factory radio by a kenwood. i don't know if this model year has a bose premium system or the standard bose system, since i have got different answers on that topic. some call it also the lux bose and the non lux bose, but i don't know which one of them ist the premium bose system.
i live in europe an therefore have no onstar. i don't know if it has never been installed or taken out later.

we tried different interfaces from pac (including the os2), but didn't manage to get the original chime (through the bose speakers) to work. is the chime produced by the amp? which interface do i need and what could be the reason that the chime doesn't work?

the pac c2r produces a quite terrible chime by itsself but that's not what i want.

has anyone an idea how to solve this problem?