Aux in cable

Hi this has prob deen done to death before but here goes ...... If i retrofit the aux in cable to my car which has the sat nav,TV (now useless :D ) bluetooth, DSP and 6 cd changer fitted will i lose any of these functions ? Or will i simply just be able to plug the i pod in and play. Sorry again if this bores you have tried search but cant seem to find what looking for. Thanks in advance Steve
 
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