I need help please. My caprice started playing up last two days. When I start up or switch off the car the radio comes up with "Voice In' and it tries to connect to the phone kit. But I dont have a phone kit installed. Its very puzzling.

Also, my right hand side passenger door wont open via the central locking system. Not sure if its related.

Its a WK caprice

I tried resetting the radio "Master Reset" but it didnt help. I'm thinking of disconnecting the car battery but I want to see if that would be a problem first. Is disconnecting the car battery a bad idea?

Oh, not sure if this helps but it is fitted with the factory Holden GPS system.

Also, if I cant fix this myself who is a good person to take it to in the northern suburbs? I dont trust Holden unless someone can give me a recommendation to a good dealer.

EDIT:
I just noticed other things playing up with the stereo. They antenna does up when turning it off and there is a buzzing sounding coming out as if a phone was trying to connect but like I said there is no sound. The buzzing is there when radio and CDs are playing. Also the CD load button keeps flashing even when stereo is turned off.

How does one reset the entire Stereo without unplugging the battery?