If there's a bench warrant for a prior failure to appear ("FTA") in court, you have to go to court and get the judge to recall the bench warrant. On a California misdemeanor, you can send a lawyer and not attend yourself. Best to have a lawyer, and this particular maneuver is not very expensive. If you go without a lawyer, present yourself to the bailiff and say you're there to have a bench warrant recalled. The court will need to get your file, and the DA will want to get his/hers. You might be there a while. The judge may revoke your bond and take you into custody for the FTA.