I have a Pioneer CQ-C1300U car CD player / FM receiver. For two years it
has worked well.

I recently moved it to another vehicle. Now I find that when I play the
radio, it works fine. All four speakers work, and the balance and fader
controls work fine. However, when I play a CD, I get sound from only one
speaker (the left front). If I move the balance control to the right, or
the fader to the rear, the sound almost totally disappears.

I am utterly mystified by this. There seem to be two choices - either I
wired it wrong, or I broke it during the move to the new vehicle. But I
can't even imagine what wiring error, or what internal circuitry problem,
could cause these symptoms.

Help, help !!

Sherman