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They do that because the internals of those units are not serviceable by Hyundai or its technicians. If one of those units goes bad, it is replaced as a whole. Hyundai does not manufacture these items, they are built for Hyundai by other companies. It would not be cost effective to try to train the techs to repair these items.
True, and that is also the case for most all car manufacturers these days, however, someone has to be able to repair them and electronic technicians should be able to obtain the internal schematics and parts lists for the radio equipment. Howard W Sams used to provide this service and auto radio technicians around the country used them as a source for schematics and parts lists. Most of the car radio OEM people provided their own schematics and parts lists which were usually more correct and helpful than the Sam's publications.
I was an electronic technician and electrical engineer by trade, so that is why I still prefer to see the "details". I have continued to do repairs of my own television and audio equipment over the years.
I do not expect Hyundai to provide the kind of information I was looking for. Most car manufacturers are now too involved in marketing and purchasing what they want for the new cars rather than designing specific items like radios. When you look at the complexity of the computer controls over so many functions in a car these days it is easy to see why they defer to outside designers for audio equipment.
The average owner now has many options in after-market radio/CD/DVD/GPS equipment that can be installed in almost every brand of car that exists. :thumbsup:
Happy motoring!
Joe