I have a 2004 Honda Accord EX sedan with a navigation/cd player. I had no security codes for either one so I got the serial numbers and converted them into the codes and now the radio works. But the screen for the navigation system is blank most of the time but occasionally will display a green band at the top when the key is turned. It will also display Honda Navigation System occasionally. How can I enter the security code for the navigation system.

 

Have you tried voice control?? 👍