Help my feeble mind... You guys want to be able to:
1. modify the display of a head unit
2. React to knob presses on the head unit with a carputer.
Is this right?
I've seen all of the flame hoops people have jumped through to get simple AM and FM into a carputer. Most approaches appear to have major limitations. I think one of the best uses for a head unit is to provide AM and FM (and/or XM, etc). In my opinion, the head unit belongs in the trunk or under the seat. Therefore I won't be able to benifit from either 1 or 2 above.
It should be easy to control most head units via infra red over the remote control interface. I'd have done this a long time ago except for the fact that the communication is one-way: the carputer won't know what station you are on.
Would an SDA somehow provide a glimpse into this?
Anybody ever hack the interface between the base unit and removable faceplates?