i recently bought a used deh-p6400 head unit and i can't fiqure out the clock setting on it i went to pioneerelctronics.com and checked the user manual the way they told me to do it was to click and hold the function button when i did that all that i get is the bsm and local display nothing for the additional functions does anyone know how i get this window up in my head unit is there a special trick i don't know about i would greatly apreciat any and all help thank you