Archived - Why won't my iPod play through my iPod speakers or car kit?
iPod, iPod (5th generation), iPod nano
When connecting iPod nano or the Fifth Generation iPod (iPod with video) to audio accessories that connect to the iPod through the dock connector port, you may not hear sound under certain circumstances. To alleviate this symptom, simply reset the iPod using the instructions detailed here.
This document will be updated as more information becomes available.