Hi all.  I've just replaced the Symphony in my Mk 1 Fabia vRS with a Pioneer DEH-X8500DAB, using the correct wiring adaptor for the car.  It all works fine, but I've lost control of the central locking and alarm from the keyfob.  Fuses are OK - any thoughts?

Disconnect the new stereo and see if the keys start working again, if they do then it sounds like the old K-Line diagnostics wire is not disconnected from the aftermarket stereo. Very common problem that can be easily overcome.

 

http://www.ross-tech.com/vag-com/aftermarket-radio.html