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First is to make sure you are using a Garmin miniUSB sometimes the units can be iffy about which cables will work. Also try other USB port on your PC the one your using may be dead. If this dosent work I would try someones else's PC to make sure its the unit and not your computer. If all this fails you my need to send it in for warranty.
If you press the phone icon on the gps immediately after dialing or when a call comes in, and bring up the phone options screen, you can then transfer voice to the phone, then immediately re-transfer the voice back to the device.
The voice will come alive. It's hokey and cumbersome, but it works.
Have you tried to use a set of headphones to see if you hear anything?
Another check is to make sure FM Transmitter isnt checked
To do that Click Volume icon
bottom of screen you see FM Trans
make sure there is no checkmark in Enable FM Transmitter
click back to main menu
i have same problem. volume goes out - often with bluetooth connection. i THINK it THINKS I'm making a phone call so automatically mutes. Checking MUTE on or off does not work. Seems that if I power down and up, or best yet power down for a bit - volume is restored and bluetooth link (which sometimes disappears) enables again.
Solution below works for NUVI660 as well; ignore everything after step 6 but DO reboot and delete previously existing connections.
I was having the same problem with my Curve and Nuvi 680. What has fixed this for me is downgrading the Bluetooth firmware version on the Nuvi itself. I was running version 3.0 (you can check your version by going to Settings -> System -> About on the Nuvi) -- I had success after downgrading to version 2.4.
It's a bit of a convoluted process, but here is the procedure I followed:
1. Download the old Nuvi BT firmware from the Garmin Italy website:
Have you tried to re-pair it with your phone? What does the bluetooth firmware version show up as on your Nuvi? If it says 0.0, you need to reflash the bluetooth firmware. You can find the firmware version by selecting the wrench icon, then sekect the gear symbol and then select "About". Use Garmin's webupdater and connect your Nuvi to the PC and let the webupdater reflash yoour Nuvi. Garmin just updated the bluetooth firmware on November of 08 to v3.4 so you would want to do it anyway. When you reflash, you have to repair the phone to the Nuvi because the reflash erases your phone setup.
Wow, as soon as I got my nuvi 360 I turned the Bluetooth off. I then updated to 4.40 and the bluetooth SW version is now 0.00 and i cant even enable the bluetooth again. I think we have the same problem. I wish I could help but I am in the same boat.
I fix this problem for my Nuvi 660 Europe. I found
resources in Italian language only:
1 - go to http://www.garmin.it
2 - in the search texbotx (i the up left corner of the page) type bluetooth and press enter
3 - click on the 1st faq that will appear
4 - download the file FileBluetooth.zip
5 - unzip the file
6 - copy 006B055301.GCD in X:\Garmin\RemoteSW directory
7 - reboot your nuvi
At this poin bluettoth would be ok newly.