Hi, I currently have a Clifford Concept 500 fitted to my car. Alarm works perfectly except that it does not chirp. I have changed the siren as I thought it was the siren battery and have also made sure that it's set to QuietChirps (the default). I therefore believe it to be a problem with the brain itself. I am going on holiday soon and so this would be an ideal time to send the brain off to Clifford for repair. All the connectors unplug EXCEPT for the immobilisation wires, how do I remove these fit for reinstallation? There is a connector with some special screws one it, is this the key? On a side-note does anyone know if a Conecpt 600 uses essentially the same pin-out as a Concept 500? So could I replace my brain with a Conecpt 600 one? Thank you and regards, Mehmet