Help with pioneer DEH-P3900MP

[dsmtim]

Hey, I know its been a while since my last post, but can someone help me out. I ran into a snag when I tried to install my pioneer DEH-P3900MP into the 1990 Honda Accord. I bought the head unit and decided to install it myself; I bought the wiring adapter with it. The problem is that the adapter plug did not fit. So I took it back and went to 3 different part stores, it was going to take 3 weeks to ship the one I needed. I had the pinouts for the stereo so I decided to hardwire it. I have it all hardwired right now working great, the only problem is that whenever I shut off power to my car (turn it off) the head unit loses all settings and reverts back to stock settings. This pisses me off alot. The only wire I currently do not have hooked up is the Antenna, where should I wire it up to so that this doesn’t happen anymore. Or any advice on how to fix it.

[Memphis]

Found this might help
Volvo: radio settings lost when car turned off

[dsmtim]

I didnt even think of that the ACC wire was hooked up to a connection that lost power when shut off, ill change it tomrow and hopefully itll work