problem with bluetooth and car

[TKH1]

 whenever i turn the bluetooth on my Xperia Z2 this turns off the car audio/satnav system - this started a few weeks ago , It is not the car system as that works fine with all other devices ?

[Ashroft98]

Try this while you are in your car

Go to Settings > Switch ON Bluetooth > Look up for a device which has a Bluetooth/Wireless Headset logo with a name of your car(if you don't know what's your car's Bluetooth Name,just choose the one with the name you never heard before) press the "Spanner and Screwdriver" logo next to it and press "Unpair".

Now you have disabled the Throw function with your car.

If you want to enjoy music from your phone to car's speaker,you need to pair them back again.