Hi i am using Sony Mex BT2500 music system for my car , i am unable to activate the Bluetooth, i tried all types which members suggested in the site, but the BT symbol not appear n can't access.

SOURCE: Sony K790 bluetooth pairing problem...

HAHA

SOURCE: Sony K790 bluetooth pairing problem...

hi im g @ y

SOURCE: wiring harness for the sony

I would contact Sony, though I am not sure if they will supply this or not, as a missing wire harness is indicative of a stolen radio. You can always try.

SOURCE: How do I install the Sony MEX-BT2500 wires?

http://www.docs.sony.com/release/MEXBT2500_install_EN_ES_FR.pdf
Here is a link to Sony installation wiring for your MEX-BT2500. You didn't say what car that you're installing in.

SOURCE: My Sony MEX BT2500 won't reset. Want to reset

Hello and welcome to FixYa!

Try this. Remove the positive battery connector of the vehicle and let it sit for atleast10mins. or more before reconnecting it. This will reset the system and can get your radio back to it's default setting.
Hope this helps and thank you for using FixYa! Have a good one!