I have din to rca (4 rca). the din hooks to receiver and the 4 rca's to deck (red, white, black, yellow) which cuple goes to Line In and which to Line Out/ thanks. vital.
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More abouthook cable
red and white is line in usually, just test it, won't hurt anything if you get it backwards.
usually the person would know what they want from each pin (or each wire) and then use a multimeter to test for impedance by touching one probe on the pin and the other probe on the rca plug. when there is a match, the needle will jump to infinite.