71 Dart horn

Hello, hello. I have a question for you all. I have a 71 Dart Swinger and the horn doesn't seem to be working. I appears that the horn is in the steering wheel rim. Squeezing the rim doesn't make it work. I haven't checked the horns themselves to see if they work yet. The service manual doesn't really talk about this type of wheel. Has anybody had any dealings with these steering wheels, how to work on them, how to remove it, etc. Any info would be greatly appreciated. Thanks

JS