I have a 06 6 speed tl.....I gave the car out to have some work done on it and when I got it back my navi disc was missing. I disconnected the battery and tried to punch in the code but I'm getting no response. Should my radio still be functioning with the navi disc.

 

After disconnecting the battery, you will need to reconnect the battery and then use the radio preset buttons to log in the radio code-- look for "code" in the dash clock display before entering the code.

As I understand it, the radio is separate from the Navi and will operate when the Navi is non-operational/DVD is missing.
The Navi has a separate code that needs to be entered on the touch screen following battery disconnection when the Navi is operational.



Assuming I understood your question...

 

yes your radio still function even without the Navi disc.