Just had my battery replaced on our 2012 MDX and now when I turn on the radio I get an “enter c” msg. If I press the preset buttons, the c turns to code, and on the 4th press it gives me an error (code error 5, I have tried it 5 times). How do I reset this so I have a sound system again?

 

You gotta put in the navi security code https://radio-navicode.acura.com/

 

Welcome to the forums.

This thread has been moved to the model specific forum for better response.

 

The +10 MDX with the hard-drive navi system only uses one 5 digit code for both navi and the radio. It is usually in your owner's manual on an extra card in the booklet (I think). Might have to call the dealership to look up your radio/navi code if you don't know it.