Here it foes i mounted my new panasonic radio on to my 94 st celica i used the diagram to connect all the cables and bam working and set up the settings but then when i turned off the car and back on the next day i saw my settings where back to default when i went and tested the cables i found out that there is a problem my v12 constant if i not mistaken is not sending any power ar my radio's setting go back to default once the car trun off and the key is not on the ignition


any ideas?

Check the fuse. Should be a 20 amp (radio no. 1) the switched 12v comes from the (cig & rad) 15amp.

If the fuse is ok it's either a broken wire or you connected to the wrong wire.