Second OEM wire harness

[TnTahoe]

I was just wondering what exactly is in the second wire harness in the back of the radio, referring to the smaller one that has the wire without any insulation on it

 

[OmarR]

The inputs from (if you have them) XM, Onstar, and the slave 6 disc changer.

Also, the VSS wire if you have the navigation unit.

 

[TnTahoe]

the slave 6 disc changer? my oem has the built in changer

 

[OmarR]

the slave 6 disc changer? my oem has the built in changer

Correct.

It's for the one you add below, near the cupholders.