Stereo USB info thread

[Concizat]

Thanks Zion for your detailed build thread and photos.
I am in the middle of installing a double din head unit (Pioneer) and am having a problem connecting up the usb socket to the new unit which has a normal usb socket but the Berlingo has a small jumper cable between the head unit and the usb socket. I wonder if you connected up your usb socket and how you did it.

[Sol]

Thanks Zion for your detailed build thread and photos.
I am in the middle of installing a double din head unit (Pioneer) and am having a problem connecting up the usb socket to the new unit which has a normal usb socket but the Berlingo has a  small jumper cable between the head unit and the usb socket. I wonder if you connected up your usb socket and how you did it.

Hi, the Kenwood had a pre wired USB cable with the socket at the end. The original USB with the little jumper cable is only for OEM Fakra units which can take accessories like cd changers and usb inputs. The Panasonic is likely ISO which can't usually do that.

Besides when you remove the box with the USB socket on it (below the OEM stereo) to make room for a double din, then it's no longer there. Maybe share a picture so we know exactly what you're trying to do.

If the new stereo has a USB on the front, I wouldn't think of trying to hook up the original socket as that's unlikely to work, and probably  no input for it on the back of the Pioneer. But... you could extend it to another position.

[deejay_xb]

you can chop a standard usb cable and solder the wires respecting usb color coding (red white green black)

[Sol]

By taking the stereo apart and patching the extra lead into the original one? and then you can't put two USB devices on at once so what's the point. Not everyone would want to strip the stereo and solder connections into the circuit board either.

ISO units have no USB pins outside to connect it to - ISO standard is speakers and power. Unless the radio has dedicated pins for the USB to connect to - which would be incorporated into Fakra which is usually OEM units only. This person wants to wire an extra USB into an aftermarket Panasonic unit. It sounds like the existing one on the Panasonic is built into the front panel.

[deejay_xb]

No, by taking a cable with a connector that matches the radio one (a male cable that plugs into the radio) and chop the cable you get 4 wires (red white green black ) and the ground cable (not needed). Then you get another usb cable with female end connector, chop that cable also and solder the wires then isolate

[Sol]

If you were just going to extend the USB from the new radio front panel to somewhere else, you can just buy a male-female extender lead. But yeah I guess you are meaning to route it to a dash panel mounted USB like the factory one, but when a double din is fitted, the OEM position is gone as it is part of the box storage below the standard single din unit.

[deejay_xb]

I have the usb and rca inputs in the glovebox, from factory I had only rca inputs, then replaced the rd40 with rd45 (with usb connection), wired the usb from the rd45 to the glovebox, cut the usb wire and solder with a custom made usb plug, I will post pics

[Sol]

Ah ok DJ, we have crossed wires (pun intended) - the person asking the question was talking with regard to an aftermarket Panasonic head unit, like the Kenwood DMX125DAB I just fitted to mine. The discussion was never related to a factory head unit.

That is why I was confused by your suggestion! Of course you can add the USB to an RD45 but that was not what he was asking about.

He asked me how I added a remote USB socket to my Kenwood head unit - I replied that it came with a pre-wired USB remote socket, which I ran to the drivers glovebox.

[Concizat]

Sorry if there has been some confusion. I am fitting a Pioneer DMH-340DAB double din head unit 
The existing Usb socket      was in the part below the original radio which will be removed.
The back of this socket       has a non usb cable          with this plug on each end.
The Pioneer has a standard usb socket at the back so I need a cable with this plug on one end and a standard usb plug on the other end .
I cut this cable in half and connected the male end of a spare usb cable to it but I couldn't get it to connect with my laptop.

[Sol]

To be honest that makes sense now, with what DJ was saying (sorry DJ, my wires maybe were crossed) as the pins should still be the same...so in theory what he said, and what you tried, are the same and should have worked. Odd that this cable wouldn't work on the laptop...

Ok, terminals on that OEM socket:

Pin = Wire No. - Function
1 = 84B6 - Supply (5V)
2 = 84B8 - USB Data -
3 = 84B7 - USB Data +
4 = 84B9 - USB Earth

Pin numbers match standard USB (remember orientation of a plug is a mirror of the socket)

   

Due to your mating a plug to a socket rear, check the pin numbers and ignore the wiring colour if it's not working by colour matching and try putting plug 1 to socket 1, 2 to 2 etc; buzzing them out with a meter to establish which socket pin numbers are which wire colours (in case citroen swaps them over for a socket or doesn't use the standard colours - the ServiceBox diagram does not show colours for these wires between the stereo and the USB socket)