I've heard similar things, Indeed deprogram the OEM radio from the ECU.

Personnally, I don't have any problems, I have a Xsara2 (2003) and replaced
the Clarion with a Sony CDX-M850MP without reprogramming...
I bought a connects2 (http://www.connects2.co.uk) unit to keep using the
display and steering wheel remote controls but it doesn't work like it
should, because my car is too new...

Frederik

"Dave Walker" wrote in message
...

I've tried fitting it, and it does connect up OK, and plays fine, but
it seems to confuse other things on the car - specifically the car
alarm doesn't work properly (won't turn off with remote, etc).
Replacing the original Clarion stereo makes the alarm work OK again.


When I changed the stereo in my xsara2, strange things happened also -
computer did not know when doors were open for instance. My dealer knew
exactly what to do - access the cars ecu and tell it oem stereo has been
removed - then it all worked ok. However in the end I put the oem back
and
upgraded the speakers instead - much better result!

Dave