Not that im aware of. Remember, if its stock why would they try to hide features like that. Get the special addition radio. Just a simple swap.

 

The 06 LX coupe has the front aux jack standard, the LX sedan does not. However the front aux jack can be purchased from Honda for about $54. Just do an internet search for 2006 civic accessories and you'll find it. The sites I found also had instructions for how to install and it looks very easy.

 

Don't forget that you can also buy an ipod interface for either 06 LX model, although it is more difficult to instal and 3 times as much as the front aux jack