Step 1: Power on your Accord and ensure the radio is OFF.
Step 2: Press and hold down the "1" and "6" buttons on the radio simultaneously.
Step 3: While continuing to hold down the "1" and "6" buttons, turn the radio ON.
Step 4: Release the "1" and "6" buttons when the display shows "Code."
Step 5: Enter the four-digit radio code using the radio buttons.
Step 6: Press and hold the "SEEK/TRACK" button until the display confirms that the code has been accepted.
Step 7: Turn the radio OFF and back ON to verify that it is working correctly.
If the radio code reset is successful, your Accord radio should now be functional again. However, if the code is not accepted or the problem persists, you might need assistance from a qualified mechanic or a Honda dealership.