I have a pioneer fh-x720bt and figure out how to get to keep memory what is the problem

If it's a car stereo yellow wires not connected to constant 12v

http://support.pioneer.eu/peeservice/instrmanuals.nsf/($$allbyunid)/95D6C753D642D16DC1257CFB0037B1C2/$file/QRB3479_FH-X720BT.pdf

https://www.autostyle.co.za/pioneer-fh-s505bt-double-din-audio-receiver-with-bluetooth.html

https://www.pioneer-car.eu/eur/cip/Volkswagen/Passat/2008/Multimedia%252520Navigation%252520Receivers

https://www.gumtree.co.za/a-car-audio-gps/centurion/pioneer-fh+s505bt-double-din-audio-receiver-with-bluetooth/1002664177270911390790809

its blown or unhooked

Either that speaker is not connected or, the speaker is blown. To test: Disconnect that speaker from the stereo and, using a 9volt battery, tap the speaker's + and - to the battery's + and -. You should hear a "pop". That would indicate that the speaker works. DO NOT connect the 9 volt battery to the stereo side of the speaker wire!!!!

I searched this and it shows up as a stereo???--I don't know what the issue is but I do know that Fords use the radio as/in the computer function of the vehicle---if you disturb this you might have bigger issues---with todays electronics in vehicles you have to be very careful with any wiring alteration--get wiring recommendations from a Ford dealer or a PROFESSIONAL STEREO INSTALLER--this is the best I can do

This is any help. May not be of any help. Here goes.
Red wire is Power
Yellow is radio memory
Black is ground
No mention of a black? Hmmmm
Double check the wire schematic, there might be a boo boo in that area. - Good Luckand get it fixed before your radio goes poof.

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remember those cd kits that came with a tape to insert to the (stero)pioneer fh-p404 and the output jack to the cd player? well instead of plugging into cd player plug it to your ipod....my pioneer fh-p404 has a tape deck and i'm able to hear all of my music without cds or tapes and i found the tape kit without the cd player for 6 bucks at walmart go figure!

Yellow is 12V constant.