I put the phone in the car, not expecting it to work, since it doesn't have a handset (yet), or antenna. Also it is analog, and the world is digital now. No big deal, all I bought it for was it's retro charm.
The phone came with this radio:

Which looks identical to the Prelude radio (below) I already had in the car. The radio I had the code for.

When I put the phone in, I swapped out that mystery radio, for the one I already had. I punched in the security code and it came to life. There was one tiny problem...
There was no sound.
In the video, you can hear the phone key tones, but there was nothing coming from the radio. It was as though the phone was preempting the radio (which makes sense, that it can).
I poked an prodded at the radio, and couldn't get anything to work. I thought maybe the radio and the phone were paired. I know the radio I already had in the car came with a CD changer, so I wondered if Honda had a special radio for the phone. But how could I find out? The radios from this era all had security codes, and I didn't have the code for this radio... which is why I didn't use it.
I searched and searched all over the net, trying to find a way to get the code. My local dealership couldn't get it. The radio-navicode site is only for American cars, and requires an American VIN. I saw a whole bunch of apps, and sites all promising to get the codes. None seemed trustworthy. What to do?
I put on my detective hat and had a closer look at the radio (39100-SV4-A000-M1). On the case there is a pin out diagram. I compared this to the diagram in my service manual, and found something interesting. The radio has a pin labeled "TEL/MUTE", and the shop manual diagram, as well as the harness for the CD changer and the Prelude radio, had nothing in that slot. Eureka!
Accord radio:


Prelude radio:


After some more digging, I found that 39100-SV4-A000-M1 is from an Accord, not a Prelude. So the phone is paired to the radio. The problem of the security code remained. The dealership said the radio came up as invalid. American Honda couldn't find it either. I even began looking for another 39100-SV4-A000-M1 radio, that came with the code. Before I pulled the trigger on another radio, I did one last round of detective work. I was glad I did. It turns out 39100-SV4-A000-M1 doesn't need a code! Weird for a Honda radio of that era, and especially one that is sophisticated enough to be paired with a car phone.
I plugged'er in and bam.. I have radio again!
Here's a video of the final product..
https://www.youtube.com/watch?v=hZ0M_VA ... e=youtu.be
In other news, I was working on the blue top, getting it ready for the swap-a-roo... I decided to clean it up a bit.



Yes, there was some unpleasantness when one of the bolts for the front motor mount snapped off. I drilled and drilled and drilled, and couldn't make a dent in it. I even went out and bought one of those specialty easy out kits. Withthe way those chintzy drill bits folded, I would have had more success politely asking the bolt to come out. I'm on the fence, as to what to do now. Do I want to invest in more hardware to remove it? Or say **** it, and let the shop doing the swap deal with it. One thing is for certain though; when it is removed, I am having it set in a ring for my g/f, cause its apparently made of diamond.