I have heard the rumor that the Honda stock radios control the keyless entry system in some models. I had no problem in my 2000 Insight, but what about Civics?

How many here have replaced the stock head unit in a 1996 Civic EX? Any issues?

I'm going to put my Mk1 into my girlfriends car. Obviously anything that goes wrong with the car after that will be my fault. Just don't want to add anything unecessary...

Armin