Hi all,
could anyone help me with this issue.
I've decided to change OEM radio to pioneer. wired everything as should be (at least tought so), and found that sounds is comming only from front tweeters.
Did the long way of trying to sort it out. even get to justwnswer.com where all kind of "Experts" giving advises. Anyway ended up by finding DIN connection on the back of the original volvo radio HU-655 which seemes to be playing back speakers and middle.
Could anyone tell me where I could get the some adapter that would let me connect that DIN connector to pioneer radio or how make it work 100%.

Thanks for any advise ,

You need an interface adapter cable. The rear speakers play through the factory amplifier. You probably remember unplugging a round 6 pin plug when removing the original stereo. I got an adapter cable from ebay that plugs into the factory plug and makes it so you can plug the "RCA" plugs from the new stereo to the factory amp. That fixes it simple as can be.

This item on ebay should fix your problem.

Go to ebay and search for this item number

Item number: 200222945473

Thanks a lot will try to get one.