1992 300sel

[blackexpress]

Can anyone help? When I turn on my radio it starts to hum and go thru these series of tones from low to high then the station tunes in. after a while I pick up a faint hum just audible above the music. My bose amp has been replaced cassatte on the becker is shot and I get an error code 2. Thinking of replacing everything with pioneer avic but wanted to ask someone on the forums.
thanks

[supra88]

HELLO:
there is a cable that goes from the amplifier to the radio by the fender it gets lose it is a plug check there sometimes is lose or makes a bad contact