Go to the forums search function. Search on only one term: xplod
Xplod is the name of the proprietary Sony system for audio/video/sound. Once upon a time, Sony had their own mp3 player and they chose to make their automotive stereos incompatible with Apple i-systems. They sell an intermediate piece of equipment to work with iPods that has a very poor interface.
Here's one of my posts on the topic. But I'd better give credit to member myoung for helping me see the light.
My info isn't more current than 2-3 years ago. Don't know what the factory is installing now. On a tour at the mothership 3 years ago I couldn't explain my complaints about them using Sony because their young audio wizard was 'gone that day'.