Do you have to pay your fines before you can renew your licence? As a law-abiding citizen, you should pay your fines when you receive them, because ignoring them may result in bigger problems and things like a warrant of arrest being put out for you.
However, if you have new or recent fines and a warrant of arrest hasn't been issued yet, the system will still allow you to renew your licence disc. If you have fines outstanding from a few months ago, the system will show that you were due to appear in court, did not show up, and may not renew anything at all. It is then your duty as a law-abiding citizen to query this in court and settle your bill or risk being arrested if you get caught at a roadblock or elsewhere by the police. #StaySmart