My avic z140bh had been working for about 6 months no problem then all of a sudden I get off from work and the headunit stops responding to touch and all the buttons loses its function ( for example when I click home or mode it doesnt go to home menu or to the map it just skips the rrack or pauses the track or on radio seeks the next station) does anyone know whats wrong I tried pulling the power harness on it and still same thing whenit boots up

If it is only 6months old it should still be covered under the warranty. Did you buy it from a Pioneer Dealer? 

No I got it off a guy on craigslist and im not sure if the warranty still works

Could be a hardware problem. If so - not much you can do except sent it in for repairs.

If you can open the screen (to access the SD slot), try running testmode. There is a diagnostic in the menu for testing keypress detection. Also I'd suggest removing the HU from the dash then bench-testing it - at least of keypress functionality. You just need a 12V power source.

I don't remember the details, but recently someone posted a helpful hint saying odd keypress behavior can be caused by the bezel (or other trim?) makes contact with the screen.

Ok thanks ima try test mode later when I get off work does anyone know a ball park number for sending it in to get repaired?

nvm sending it for repair isnt really an option i checked and it was 230 for repairs

when its in test mode buttons work but the menu jumps everywhere like the buttons are being pressed on its own any way to fix it with out sending it to repair?