What is this harness behind my amp?

[Ramps]

I just noticed a long harness (about 3ft long) coiled up behind my HK amp in the trunk, it has two plugs on it and it joins with the rest of the main stereo harness. Anyone know what it’s for? The car came with the Business CD and HK sound. Is this for the optional changer or navi?

TIA

[Will]

Looks like the plugs for CD changer. Perfect to plug a BlueBus into it.

[Shonky]

CD changer. 3 pin one is +12, Ibus and ground. 6 pin one is left and right audio.

[Ramps]

Thanks guys! I'll just put it back where I found it for now.