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If you have the passcode, then remove the battery terminal and wait for five minutes. Reinstall the terminal and reinsert the passcode. Make sure the car is outside of any buildings and this may intefere with the gps.
The things you'd want to check first are:
1. the volume of your speaker is not turned off ...
2. your GPS (navigation) software supports voice navigation - directions /commands ...
3. you have (installed & selected) a navigation voice (e.g. standard or computer voice)
4. you have done a "reboot" ... or "hard reset" ... to start the software up again.
If all of these are OK ... and you previously had heard navigation voice on your GPS ... but suddenly, there's no more navigation voice, then it is possible that the navigation software (voice portion) got corrupted. If that's the case, you would want to try to restore your software from backup (using HOME), or download a copy of the navigation software from TomTom.com (for your device type/class) and install it.
Try a GPS reset, exit navigation, click on setup, click on GPS reset. then restart navigation. check the gps status screen to make sure you are getting signals. if not, you could have a failed antenna or GPS receiver in the unit.