I have an AVIC-N1 that has been working perfect since I had it installed.

Today I noticed that me unit stays on even without the ignition on. I had to pull the fuse to shut it off.

Any idea what could be causing that?

Bad wiring job

My AvicN1 has been installed since 2005. If the wire install was bad it would have had this problem a long time ago.

Got anything else?

What vehicle is it installed in? What harness/interface did you use?