New iTouch doesn't work in DEH-P4800MP

I had this exact same problem. Here is how I just figured out how to fix it. First of all, my friend as an iTouch as well, so I plugged his iTouch into my DEH-P4000UB, similar to your 3100UB, and it actually worked and played music. So I went to my Music then selected a song and pressed pause. I turned on the car and then plugged the USB cable into my iTouch, exactly the same as yours. When I replugged my iTouch into my deck it gave me a different error this time, Error-19. Refreshing but still frustrating. So I turned off the car, unplugged the USB cable and tried it one more time. This time I selected "Repeat" on the song, don't ask me why, but this is exactly what I just did. I turned on the car, plugged the USB and it worked!!!

I understand your frustration and I've been dealing with it for a while now. So hopefully this helps. Good Luck!

Chances are it's the docking module... try pulling the ipod forward and see if you get some sound.

One can slip something in behind the ipod to prop it so it will give sound sometimes but overtime the problem gets worse in my experience.

There's the Auxillary input as well in the back... i.e. running an adapter from the headphone jack to the back. For an Ipod Classic one can leave it in the docking station re-charging - for the nano, with the headphone jack on the bottom it can't be placed in the docking station (though can be - recharged when not plugged in)

Don't forget to switch the selection to Auxiliary rather than Ipod

That being said, in terms of sound quality, the quality is much better (highs are higher) when plugged into the docking station compared to the Auxiliary input

you have a stereo rca plug set to a mono audio plug.
you need a stereo rca plug set to a stereo audio plug

I had to reset my itouch, then reset the Belkin Tunebase FM. I then had to change the radio frequency that Belkin's website recommended. After tha, the itouch played through the radio.

this was made to work with any older genegarion ipod that works on firewire power not usb
most ipods

this is not fully compatible with the new iPhone,iTouch new nano and the ipod classic

hold it for like 30 or so seconds and press back and forth and it should work hope this works

Turn the volume up on you ipod.

Yes it does, I have proof.

Open a new window/tab browser. Click this link to the PIONEER WEBSITE PDF File for this cable. Please refer to page 7of 84, and look in the category "head unit group 1"... From the BOTTOM LEFT of this paragraph count up FIVE LINES, your Head Unit Model number is right there.

I hope this helps,
Scott

I will need more information, what cable are you using to "plug" it in. My DEH P4800MP does not have a USB jack on it any place.Please give more information. I will be glad to help you then.

Sorry,
Scott

How about the red (switched power) wire? The unit will not turn on unless you have 11+ volts on the yellow AND the red power leads.