Solved! - Punto SubWoofer not working . . .

Any help on this problem would be much appreciated!
I have recently swapped the standard (Blaupunkt) stereo head unit on my Fiat Punto 1.2 ELX (2000 - W reg) for a new Pioneer DEH-P77MP head unit.
The wiring diagram in the Fiat manual isn't too helpful but I managed to confirm the speaker wires in one of the euro connectors (top one) was correct and most of the wires in the bottom connector (which include earth and +12v (twice) + 12v switched. However, when I switched on the radio played OK but no sound was coming out of the SubWoofer. To check I hadn't damaged anything, I put the Blaupunkt back in and the SubWoofer worked OK. I also disconnected the very top coloured connector blocks on the Blaupunkt and the SubWoofer still worked.

If I annotate the bottom connector and the Fiat side of the wiring, it looks like this:

1 2 3 4
5 6 7 8

1=Not Connected
2=Green/Blue - switched 12v (i.e. comes on with ignition)
3=Grey - auto antenna?
4=Red/Black - 12v
5=Not Connected
6=Red/White - 12v
7=Yellow/Green - 12v lighting (i.e comes on when lights are on)
8=Black - Earth

The new pioneer unit has connectors for all the above accept no.3 which is blank.

I am at a loss to understand why the SubWoofer isn't working. The front and rear speakers are working OK off the new Pioneer.

I thought I would ask this forum if they had any ideas before I started digging deeper for a solution!

perhaps the electric antenna is used as a signal/power for the amp in the subwoofer, if it has an onboard amp that is;)

The Fiat Cinquecento
Fun While It Runs

lack of pin 3 is your problem the fiat punto sub is powered from that pin it sends the signal to turn the sub on you need an elec arial (auto antenna) out on your head unit.

First off many thanks for the help on this - problem is now solved.
First off, confession time - I meant that Pin 2 was blank not 3.
However, the answer seemed to make sense - so I went back and checked the instructions and wiring! The Pioneer comes with a euro socket connector, connected to a mini-harness of wires that go back into a plug that fits into the back of the head-unit. One of these wires (Yes - the one connected to Pin three was split in the middle with each end having a connector. The two wires had to be joined if you wanted the power to go to pin 3. Pioneer give the flexibility to connect or not.
I guess it was a case of I should have RTFM!
Having now cracked this problem (with the help provided!) I can thoroughly recommend the Pioneer and am pleased I made the change.

can you explain this in colors for the wires because i got the same problem and i cannot get it thank you in advance

This thread is 5 years old.

yeahh i know but this one was close enough with my problem

10 points to gryffindor for actually using the search button!

i didn't catch the last one but still anybody or at least someone explain the solved problem pleaseee

Do these help
https://www.fiatforum.com/i-c-e/2179...punto-mk2.html

https://www.fiatforum.com/i-c-e/2175...head-unit.html

https://www.fiatforum.com/i-c-e/2178...ease-help.html

All pretty much the same thing within the last week with posts within the last day. Its a strange coincidence.