I bought and installed the radio today it won't read the USB anyone may know why it says USB full SD card full

You gave virtually no useful information. What model unit? Was it used? What version f/w? What kind of USB device? How was it formatted? What size? How many files stored? How many folders?

The user's manual has a "Media Compatibility Chart"  in the back, stating limitations for each type of media.

BTW, was it an SD card or some USB device.

I bought and installed the radio today it won't read the USB anyone may know why it says USB full SD card full

Pioneer avic z150bh when i plug in my USB sandisk crushed guide 64 gig it won't read it at all the USB button on the screen is grey ish and when I go to source settings and click sd/USB settings it won't let me click on either and it says full

Pioneer avic z150bh when i plug in my USB sandisk crushed guide 64 gig it won't read it at all the USB button on the screen is grey ish and when I go to source settings and click sd/USB settings it won't let me click on either and it says full

I don't have any experience with Z150, but I'll take a shot.

• I assume you mean Sandisk Cruiser Glide? Regardless, if it is formatted exFat, it won't work. Must be Fat16 or Fat32, with only one partition.
• Make sure your App Connection setting is not set to iPhone. If it is - the unit may expect an iPhone to be connected to the USB via Lightning. (just a hunch - no experience).
• Are you sure the USB cable is correctly plugged-in to the Z150?

   

Also know that AVICs have a limit of 5000 files and 300 folders for USB devices.