Regarding my Nuvi 660 in the blue-tooth mode the unit does not pick-up any sound. I can hear all the sound on the other end of the phone call but by all appearances the unit's microphone is not working. The unit is out of warranty and working fine with the exception of this one problem.
Hi Joe,
First, I would go to the Garmin website and update the bluetooth software. Garmin just released v3.4 a few days ago (November of 2008). Use their webupdater to upgrade the BT firmware.
When you update the firmware, it will erase your phone paring data and you will have to re-pair the phone with your Nuvi.
Now, if that doesn't fix your microphone issue, you have either one of the following two problems:
1. The microphone is a condenser microphone. It's about a 1/4" in diameter and sits behind the front slot located in the lower left hand corner. The microphone has two wires (red & black) that run from the microphone to the main board. At the end of the wires is a 2 position plug that plugs into the main board. This plug can come loose as there is no lock mechanism on it.
2. The microphone is defective.
Please do not try to take apart your Nuvi unless you have the right tools. I have received many emails from people who have further damaged their Nuvi, trying to get it open.
Please let me know if you need further help with this problem.
Good Luck,
- Jim
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