As Nodge68 says, you need to plug the jack plug in. It goes into the back of the stereo.
I'll see if I can find the instructions, sure I've got them in the garage.
Hi, and thanks for all your thoughts & advice.
Firstly, I found the Seller's advert on Ebay conflicted with what they printed on a Diagram sheet that accompanied the Plug’n-play harness. The advert stated, 'no wires to cut', while the Diagrams said otherwise - on the Patch wire. I initially took that to mean I didn’t need to connect the Patch at all, especially as the same sheet also stated it was for 'None-Branded Players' only. That was where it all went wrong. I especially didn't want to cut any cables as the warranty would have gone down the toilet.
I queried it and the supplier replied, suggesting I
do need to connect the Patch, which in-turn meant
cutting a couple of wires as well as attaching another.
All-in-all, I carried out the new instructions with toungue-in-cheek and it all worked. Phew.
My new player didn't have a 3.5mm Jack-socket so the Patch plug wasn't required, ending-up being insulated with tape.
My new JVC Hi-Fi plays well and I have my Steering-wheel controls too.
I’m now a Happy-Bunny bopping along to MP3 music.