Bluetooth will not connect with my htc thunderbolt

There should be a bluetooth module in the dash. Impossible for me to tell if that is your issue, but would be a good place to start.

I've found Volvo's bluetooth to be pretty reliable so I'd try with a different bluetooth device first. If you have an old used phone, throw some music on it and connect it to the car and play it for the next day or two while you're driving.

If that works fine, it's probably your phone. Check for updates to the phone and do a factory reset (or at least check/remove apps that use/manage bluetooth) to see if that helps.

I have an issue with my Wi-Fi at home that's just like that. I go to my car and instead of it hooking up to the Bluetooth right away, it either takes time or just doesn't. Its more than likely a software issue with your phone or the receiver is not detecting your phone. I would have your carrier look at your phone if its still under warranty

Make yours car bluetooth visible when trying to pair with phone

by presseng bluthoth buttone and search phone it should be get

otherwise
if u have connected before and was working fine so take the battery cable out for 2 hour might be rest

regard

If your car has the Bluetooth phone option fitted (most models with the touch screen 2006 onwards do) You may get the message SIG instead of Phone connected.

Please see http://www.blujag.co.uk for detailed bluetooth instructions.

The picture Im sending you is the information on your vehicle based on what I can get from General motors tech website to inform you if your intstructions in owners manual are unable to correct your situation.There really no way to quick fix the issue.here is the page information; Before reading note there are unavailable sections or links because it is pasted from a General motors page unavailable to public.
You are looking at a trip to General motors unfortunately unless you can find a shop with a tech 2 scan tool.

Circuit/System Description The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.
In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone’s information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.
Diagnostic Aids • The purpose of this diagnostic is to verify the ability of the telematics communication interface control module to pair to a Bluetooth ® device. • Before performing this test, verify compatibility of the cellular phone(s) the customer is attempting to use with the vehicle. Based on the cellular phone’s service provider and the manufacturer’s implementation of Bluetooth ®, not all phones support all available Bluetooth ® functionality. A vehicle and feature compatibility list will be provided via the GM Bluetooth ® website: http://www.gm.com/vc/bluetooth/ • If the vehicle passes the following tests and a compatible device is being used, the concern may be due to a device malfunction or an incomplete/improper pairing attempt. • A Bluetooth ® test tool or equivalent can also be used to verify the ability of the customers cellular phone(s) to pair with another device. Schematic Reference OnStar Schematics
Connector End View Reference Component Connector End Views
Description and Operation OnStar Description and Operation
Electrical Information Reference • Circuit Testing • Connector Repairs • Testing for Intermittent Conditions and Poor Connections • Wiring Repairs
Scan Tool Reference Control Module References for scan tool information
Circuit/System Verification

1. Verify DTC B2485 is not set.
→ If DTC B2485 is set , refer to DTC B2485
2. Set up a Bluetooth ® test tool or equivalent.
3. Ignition ON, perform the discovery/search operation with the test tool. Verify the vehicle appears in the list of available devices.
→ If the vehicle is not in the list of available devices, repeat the discovery/search operation. If the vehicle is still not in the list of available devices, replace the K73 telematics communication interface control module.
4. Follow the instructions provided in the Vehicle Owners Manual for pairing a device. Verify successful pairing with the test tool.
→ If pairing is not successful, repeat the pairing process. If pairing is still not successful, replace the K73 telematics communication interface control module.
5. Refer to Diagnostic Aids.

Repair Instructions Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for telematics communication interface control module replacement, setup, and programming

on the radio keep pressing the mode button until blue tooth comes up
go from there
all the details are in the user manual

http://forum.xda-developers.com/showthread.php?t=583570&page=7

Contact your dealer. If there is something wrong with the car it will be fixed under warranty.