Yes it is the switch that disconects the power to the antenna for use with CD's. I dont have a scanner but I will post the directions and maybe it can help you figue this out. Here it goes
1. remove the bolts , pull radio out. Not exactly the same but a shortened version
2. Locate the BLACK plastic connector that has four wires in it that was plugged into the back of the radio. Disconnect this and plug into the harness end, looks just like the one you disconnected.
3. plug the jumper back into the radio thus completing the radio's power circuit as before.
I know it's not much but there are 2 black plastic connector behind the radio. I think one is factory and the other is the new harness to run the new deck. The kit I bought looks just like the factory black boxes, female type with four wires comming out of it from the F,E,M,G terminals. Wires are black,gray yellow and pink. The pink wire is spiced where a on/off toggle switch was place. I hope I made some sense, if not I can send you the direction and the kit and maybe you can figue it out for me. That would be cool. Let me know.
Dan