What is the software (OS, graphics libraries, etc.) and hardware architecture that cars use for their multimedia systems for controlling radio, cds, navigator or telephony.
This is called IVI system short for In-vehicle Infotainment System. There is certain organization like GENIVI creating standard software infrastructure for this, applying for most of the automotive vendors. This alliance aims at creating a software infrastructure made of compliant components for car infotainment systems. The base operating system is Linux.