If your Honda Civic's Hondalink system is frozen and won't unfreeze, there are a few things you can try. First, try restarting your car to see if that resolves the issue. If the system is still frozen, try resetting the head unit by disconnecting the battery for a few minutes, then reconnecting it and turning the car back on. If these steps don't work, it's possible that the software may need to be updated or that there's a hardware issue with the head unit. In this case, you should bring the car to a Honda dealer or a professional mechanic to have it checked.