On the backside of my Sondpex RUSX903 car radio I found two RCA jacks: a red and a white one. With an adapter cable I connected these to my cellphone headphone jack. So far so good, I noticed two odd things though:
The volume control of the car radio does not affect the volume of the music coming from my cellphone. I gets pretty loud though when I increase the volume on the cellphone.
The music from the cellphone plays independently of the selected input. If the selected input has some audio as well (e. g. the radio,) I can hear them both mixed together.
Recently a car electrician saw my setup and told me the RCA jacks I'm using for input are in fact output jacks.
Why is this even working? Why is it even possible to use the output jacks for input?
Is it safe,or should I expect to run into problems or even damage something?
The Aux Input Jack on the Front Panel of the Car Radio is broken.