Aparently this drives the US guys crazy!
They have many threads on this topic on the lgtforums. Read a few and found out that the drivers side chime can be disabled easily by unplugging from underneath the seat, HOWEVER this does NOT work with the passenger side because the passenger side connector incorporates the seat airbag too.
This is probably your best choice in what to do, doesnt involve cutting anything and im pretty sure its reversable as nothing is 'broken' or taken out.
http://legacygt.com/forums/showthread.php?t=62304
Good Luck
