Hi Dongbeiner,
I too have had similar problems with my "Hands free, voice command" nav system, but the problem is usually simple.
1st, let's verify that you have a good signal strength, so drive to where you know you have 4 bars on your phones signal strength bar graph icon.
Now, shut the truck OFF. Go to *menu* on your phone. Now, go to *Settings*. Find *Wireless & Networks *. Now scroll down until you see, "Bluetooth", and make certain that, that's checked/selected.
Also, make sure that "Airplane Mode" is turned OFF. Now go to your phones homescreen and make sure you see the Bluetooth icon in the status bar.
Now restart the truck; watch the Nav screen. In a few seconds, you should see, "Searching for bluetooth devices". If it says, "unable to find bluetooth device", go to *Menu* on your phone. Now, press *Settings*. see "Wireless & networks" (I'm using Android, but they all have the same basic functions).
Now this time, scroll down to *Manage Bluetooth*, and select where it says; "make bluetooth discoverable". All that does is send out multiple radio frequencies, to make it easy for your nav to recognize a familiar signal frequency.
They should "Link-up" automatically. Now press & release the "Talk button" on the steering wheel. Now say....Dial XYZ, OR dial Mom. The prompter ( a Ladies voice) should say, "choose a line number, or correction".
That should work, but if she says "That contact does not exsist, and you know it does exsist, you may need to "Refresh" the truck's nav phonebook; but don't worry, it's easy! Just press the large phone button on the dashboard, next to the nav screen.
Now, see 4 options, touch number 4, "Refresh phonebook".
All that does is Links all the contacts in your phone, with the contacts (both old & new) in the nav system's contact list.
YOU'RE DONE!
Here are some references from: Display Audio System Owner's Manual: page, 74 thru 81, 161 thru 164, 209 thru 210.
I'll give you my email addr just in case you still have trouble.
It's:
[email protected]. If you email me, we can exchange numbers for convienience.
Best regards, Greg (rigtec)