Toyota RAV4 2012: battery/radio

Hello, the only thing I can imagine is that a power surge from connecting the battery may have caused the audio unit circuit to spike and blow the fuse. Check for blown fuses. If that doesn't satisfy the concern, then perhaps try disconnecting and reconnecting the battery. Beyond that, professional assistance will be required. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops