Why won't my key fob lock or unlock?

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I recently bought a 2011 Ram 1500. It has keyless entry but did not come with a key fob, so I had one programmed. At first, the unlock and lock buttons would not work but the fob would start the truck when inserted into the ignition. I replaced the IOD fuse with another fuse from the box and the unlock and lock buttons would work. So, I pulled the fuse and drove to the parts store to get a brand new one. Once I got home, I replaced the IOD fuse again with the new fuse, but the lock and unlock buttons are back to not working. The key fob still starts the truck when inserted into the ignition, but I can’t get the lock and unlock buttons to work.