So i am helping my uncle with his new dark gray 2.5 roadster. It has the alpine unit with the kce 400bt unit for blue tooth. Got it to pair initially, then stopped working. Now i can't get the setting menu, even after attempting all the steps identified above. I am using an Iphone4.
I have played with this for a while now. I haven't figured out all the quirks, but you will need to explain what exactly you mean by "stopped working." Let me explain what I know:
I have an iPhone 4 with latest iPhone OS.
Once the iPhone is paired with the Alpine, it seems to remain paired, but it will sometimes exhibit behavior as if it is not paired. Let me explain. Although I can play music from the phone, over bluetooth, through the Alpine, you cannot initiate calls with the Alpine. To initiate calls, you need to use the iPhone. In my case, the audio defaults through the Alpine, but you might have to choose it as a headset from the iPhone's in call buttons. In any case, I have found that no one can hear me when using the Alpine hands free bluetooth phone interface, so I will not be using it any more. Also, even though audio will play over bluetooth, I have found that in the system menu: If I search for devices, the iPhone does not show up.
I'm not sure what you mean by "enable bluetooth on the iPhone." Aren't you leaving bluetooth on? Once you turn on the car, within 5 seconds the Alpine and iPhone pair. If you choose bluetooth audio from the Alpine's source menu, it will start playing music. As for receiving calls, those should show up on the Alpine automatically. You can pick up the call by pressing the screen on the Alpine. As for making calls, see the previous paragraph.
As for getting into "system" setup menu, we discuss that in this thread. I have noticed that there is an additional bug that I have not yet been able to reliably reproduce. There has been a time when I placed the vehicle into park after driving it. I applied the hand brake and placed the source on radio. I released the hand brake and reapplied it. The system menu would not show. I then became frustrated and released and reapplied the handbrake multiple times with no apparent effect. I changed source a few times and played with the hand brake more and the menu appeared. I was pressing buttons and moving levers so fast, that I didn't keep a record of which maneuver worked. If this happens again, I will pay closer attention.