TXFM

I moved my XM radio from my SC430 [where it worked fine] into my wife's '98 LS400.

I used the same tape player adapter that was in my SC, but in the LS, I hear a "clicking" noise as well as hear the XM audio. The LS will also play regular tapes, but there is the same noise.

It kind of sounds like the click you hear when a tape reverses, but it is constant. Even when an audio tape is inserted and music is playing.

Can anyone suggest a solution?
Thanks