One problem related to horn assembly has been reported for the 2001 Saturn SL. The most recently reported issues are listed below.
For some time now my horn is unreliable. I was behind a car that was attempting to reverse and was trying to alert them of my presence and my horn would not work. I repeatedly kept pressing the horn icon on the steering wheel and nothing happened. I was lucky that a person walking noticed and alerted the driver in front of me. Another time I was at a traffic light and the person in front of me was distracted with something in their car and the light was green and I had cars lined up behind me, I tried to blow my horn to alert them of the light change, no horn. Again pressed horn icon repeatedly and nothing happened. I would say the first occurrence happened in 2009 and progressed with sporadic availability until it completely stopped. I have too many instances to name where I needed my horn and it failed to work. I have contacted Saturn and am waiting their reply.