I'm presuming here that your Honda Accord has some kind of bluetooth capability. In which case, you'd need to pair the phone with the bluetooth thing in the car. go to settings on your iPhone, then bluetooth, and turn it on. Make sure that discovereable is turned on as well. For texts and email notifications, see if that's on or off under notifications or sounds, as in "play sound for XX", and make sure your volume on your iphone is turned up enough. if it doesn't work, you may have to delete the thing on your honda, or on your iphone, re-add it and re-pair it. Your sig says you have an iPhone 4 , but you talk about an iPhone 6. ..I think you have to turn on the speaking maps thing as well. go into sound and see if it's set to play sound out through the bluetooth rather than the headphones.
[sorry I can't help you more}
JB