Kenwood KDC-519 CD Player "head unit production mode" Questions

...head unit because you will need to ground the pink (I believe it's pink) wire somewhere in the car where there is metal. You need the switch because when you ground it, that causes the unit to goto ...

...head unit from (nitro) a sister co. of alpine. my issue is that al other functions except the cd drive works. when i insert a cd the receiver says loading but aborts the disc and says error 6. then ...