I have a 1993 Boneville SE. My audio controls are not working on my steering wheel. What could be wrong with it?

fuses, wiring harness, controls themselves, clock sping. unsure if there is a module to them

I have the same problem. I replaced my cassette radio with the factory cd, so I know the radio is not the problem. How do I get at the clock spring? Since all the buttons don't work, I don't think the tooth pick trick is going to fix it.

to get to the wiring for them and the clock spring first take your air bag off then remove steering wheel the clock spring is behind it

In a 92-95 car.. This is quite common. We need to search toothpicks to find the answer. The pusher pieces usually turn to peanut butter and no longer push the switches. Many have replaced them with toothpics dipped in JB weld

Can it be tested before removing the steering wheel?

IIRC you don't need to remove the wheel. Just pop out the button pods. To test it you could check the wire at the radio for changes in ohms when you press buttons. In reality though, that'* more work than popping the pods and checking.