[sonnybk]

I found a plug that looks like it's possibly an auxiliary for the radio. Any ideas? (there's no aux function on the bose radio, though)

 

[dbrick]

Where's the other end of the cable go?

 

[hu vw]

My first thought was S-Video but it is missing the notch (for the orientation nub) opposite the rectangle as seen below.

Edit: Has the vehicle ever had monitors in the rear?

 

[Steve in Chicago]

Looks like the same connector they used for s-video. That would accommodate two pairs of wires. Probably not factory. Follow the yellow brick road.

 

[boyesreef]

what about the rear 6 disc changer?

 

[soundguybob]

What radio do you have? "The bose radio" isn't quite descriptive enough!

Have you followed the wire to see where the other end goes?

 

[TheColoradoRed]

Follow the yellow brick road.

Yup.

 

[neonhomer]

Almost looks like a CD changer cable for a Sony head unit....