Schmitza

Hey guys. I did a swap from previous android to one with CarPlay, assumed it’d be pretty straightforward. Until I saw the rats nest of wiring done by someone who should never have touched wiring in the first place. They had what seems to be the reverse trigger jammed into the grey connector behind the deck. Long story short it fell out when I pulled the deck, cleaned everything up but can’t find which pin it was on. Any ideas?