what does the accessory protocol interface module do
Ford Sync The SYNC computer, which Ford calls the Accessory Protocol Interface Module (APIM), is housed separately from the head unit, called the Audio Control Module (ACM), and interfaces with all vehicle audio sources as well as the high-speed and medium-speed vehicle CAN-buses.[20][21] The first generation of the Ford's SYNC computer was designed in cooperation with Continental AG[22] and is built around a 400 MHz Freescale i.MX31L processor with an ARM 11 CPU core, uses 256 MB of 133 MHz Mobile DDR SDRAM from Micron and 2 GB of Samsung NAND flash memory,[23][24] runs the Windows Embedded Automotive operating system,[25] and uses speech technology by Nuance Communications. Utilizing the USB port, SYNC's Microsoft Windows Auto-based operating system can be updated to work with new personal electronic devices. A Cambridge Silicon Radio (CSR) BlueCore4 chip provides Bluetooth connectivity with compatible phones and devices. SYNC's major circuit board chips cost roughly US$27.80, which allows Ford to profitably sell the system at a much lower price than competitive offerings.[23]