Using bluetooth (music) in car

First time using bluetooth, please bear with me...

-Using iPhone 5C
-Paired the phone with my car this morning before work, everything went smoothly
-I parked my car at work, and left my phone in my pocket. I did not disable bluetooth or anything like that throughout the day.
-After work, I turned on my car, and my expectation was that the connection between the car and phone would be automatic.
-I pulled out my phone and started playing some music.
-Music was coming from the phone, not the car.
-I went into the bluetooth settings (in the settings app), and bluetooth was turned on (as expected), but it said "Not Connected" next to my car's name
-I tried connecting, and it failed after 5-10 seconds.
-I toggled bluetooth off and on, and tried connecting, and it connected and started playing music.

Please tell me this is not the standard procedure for using bluetooth. I don't want to turn bluetooth off and on and connect every single time.

Please help. thanks

 

Thanks to everyone that replied! I'll look through my car deck manual tomorrow to see what options I have... The car is a 2008 bmw 3 series, but I upgraded the car deck last year: http://www.jvc.ca/www/Mobile/model.aspx?m=KD-X50BT

 

Update:

I erased the pairing, added it again, then searched through the car deck settings until I found an option for "autoconnect", which was disabled. I turned it on, and it works now.

So now, I can walk into my car, turn the car on, pull out my phone and start playing music and it plays through my car speakers. Is that how it works for you guys? or does the music automatically start when the car and phone are close to each other, without me having to open the music app and clicking Play?