Yes, in the past, they had a standard radio form factor, they updated them every dozen years or so, so they did change, but most likely any radio from the same model vehicle only different by a few years, would plug and play, and if it wouldn't, it would be obvious, the radios would be different shapes with different connectors.
Today, the radios are part of the proprietary software system. Some of the measures might be justified to prevent theft, but I suspect, like most of the proprietary software issues, its the manufacturer trying to create business for the dealer by forcing customers into the dealer for things they would normally do themselves or pay the local corner garage to do.
Also, legitimately, the newer radios do have many new and more capable features, like Navigation, that does require a lot of interaction with the rest of the vehicle, and use the CAN bus to do it. Although, I still argue it should NOT be necessary to go to the dealer for some simple configuraton changes, I can see how changing radios could require those simply configurations changes for it to work properly on the BUS and talk with other modules to enable its features.
So, I'd follow dhh3's advice.
Help for your research, do a google search for 07XK.pdf and 08XK.pdf, these are the manufacturer parts catalogues and they are often available somewhere on the internet. You can compare part numbers in the different catalogues and rule out or in the possibility of swapping. It may still require a visit to the dealer and paying them to use the proprietary tools to configure the vehicle and radio software for them to work together, it may NOT.
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Last edited by Mongo; 07-18-2011 at 10:00 AM.