I actually put some thought into this idea a while back.
There are a couple of hurdles to overcome:
1st: The moto HF850 module (which I happen to have had at the time) does not provide caller ID information to any peripheral device (keypad, etc.) So I don't readily have access to this information.
2nd: As far as I know, the 2001 DTS (which I happen to have had at the time) cannot accept any form of external text to be displayed on the radio. Since my IPOD interface cannot display song info, I assume this to be true.
To get around problem 1, I could base a module on the Parrot bluetooth interface. But that would add significant cost to the overall solution.
To get around problem 2, it might be possible to tap into the RDS system display somehow, but I can't really see that viable since that is modulated data on the FM radio carrier.
As for me, I throw the phone in the well in front of stick shift and if it should ring when I'm in the car, I simply pick up the phone and look on the display to see who it is. A little archaic these days I admit, but it actually works!
And besides, sometime I dont want the passengers in my car to know who is calling. Could be an old girlfriend. (Or worse a new one!) My wife would be steamed.
