The CD Enable line is 0V when the radio is off and +10V when it is on
Head unit pinout abbreviations meaning
|R+||right speaker out|
|L+||left speaker out|
|R-,L-||The corresponding speaker ground|
|ACP||Audio Control Protocol|
Ford ACP is a network protocol used by the Head Unit to communicate and control audio devices such as the Ford 6 disc CD Changer or Ford Telematics units. It is based on RS485 with 9 bit character data at 9600 baud. A MAX-481 low power RS485 transceiver will work as interface between a serial USART and ACP bus.