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First, do you hear beeps when you press a selection on the screen? If yes, then your speaker is OK and the audio circuits are OK in the unit. Make sure that you have a voice selected in the voice menu. Some units have an audio mixer screen and provide different volume settings for navigation (voice) and system (beeps). maybe the volume for the voice (navigation) is set to off. If you don't hear any beeps when you touch the screen AND you don't hear a voice, make sure that the sound isn't set to be muted. If the sound isn't muted, you may have a defective speaker. More information on audio issues can be found here: SHARCNET USA Out of Warranty GPS Digital Camera Repair
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.
The usual problem is the voice volume is turned down. This can happen when you are adjusting the volume down just as turn by turn instructions are starting; thus you don't notice it happened, or someone else did it or software glitch caused it or Murphy's law. The way to fix it is turn vol up to max and set navigation and start driving. As you get to navigation points where you would expect the turn by turn instructions hit the up volume button. Keep trying it will only go up whilst instructions are being broadcast. Try using repeat last directions function to get a better shot at it. This happened to me and this was the fix, odd but true. Also see if there is a turn by turn vol level in settings. Hope it works for you.
Could be mute controls for the telephone. The voice for the Navigation is adjusted separately from the radio volume. If any work was done on the vehicle, like a battery disconnect, then radio controls may need to be reset.
You need to toggle through the Menu to things like screen brightness for the Navigation.
You also have a speed sensitive radio and the volume controls could be affected by these settings.
Have you tried setting the volume higher yet ? (it is usually an option on your menu / settings screen).
If you already have done that, and you still cannot hear the directions while the screen shows the maps, direction arrows, etc., and you have selected a valid "preferred" voice/sound, then the speaker may have to be checked / fixed.
I was told by on star that if you leave the drivers door open for 90 seconds and then lock all of the doors and wait until the next day the system will reset itself. I know this sounds like smoke and mirrors but it does work. Please let me know. Hope this helps.
hit setup...then under AV setup...click over to the 3rd screen...and it should give you options for navagtion volume and and options for muting and overiding the sounds comming from the speakers either front left, right or both....