It was the new XJ6 that was going to be the first bearer of this technology and that's a great deal than 9 years ago, I think that they just couldn't make it work, maybe they should have studied DCC model railway technology, that seems to wotk well enough.

Mercedes is using CAN-bus and CAN-bus II in their cars, which is two wire network for the mobile enviroment. CAN means Controller Area Networks. In the new E class every piece of electronic has its own controller, like you mention for the Jaguar. I also think i saw somewhere that Dalles One-wire technology was introduced in a car somewhere.

\\Kaare