He needs to go in with an attorney and have them quash the warrants and work out a payment plan.
Feel free to contact my office with any questions, I am unclear about the entire situation. How many bench warrants does he have.
The clerk's office won't accept payments on a case that has gone to warrant. The warrant will have to be recalled by the judge before anything else can be done on the case.
Your friend can consult with a local attorney to discuss getting the warrant recalled (hopefully without your friend ever having to appear in court) and getting back on a payment plan he can stick with - or converting the fine to community service if possible.