The connectionD75receives the direct supply - pin 9 - from the battery via the line of fuse F39 of the unit under the dashboardB2.It receives a supply controlled by the ignition (INT) - pin 7 - via the line of fuse F49, of the unit under the dashboardB2.Pin 8 receives a supply with the side lights on, coming from the Body ComputerM1, pin 18 of connector C: the telephone, if fitted is lit up like the other controls See E2530 INSTRUMENT LIGHTING.Pin 10 of connectorD75is earthed, via the radio earth, pin 12 of connector C ofP20.Pins 4 and 5 supply the signal to the radioP20- pins 7 and 8 of connector C, which then controls the speakers See E3510 RADIO.Pin 1 is also connected to the radioP20, pin 1 of connector C (MUTE function).