The Bluetooth control unit M162 is supplied directly (16 of connector A) from the battery via the line of fuse F51 of the Body Computer M1.The Bluetooth control unit M162 receives an ignition-operated supply (32 of connector A) from the battery via the line of fuse F61 of the Body Computer M1.Pin 15 of connector A of M162 is earthed.Pins 14 and 30 of connector A connect to the CAN network that connects the Bluetooth control unit M162 to the Body Computer M1 (pins 5 and 20 of connector D) and to the other system nodes.The Body Computer M1 is connected to the radio controls on the steering wheel via clock spring D47: pin 35 of connector D supplies a reference earth to pin 7 of D47; pin 52 of connector D of M1 receives signals from pushbuttons located to the left of the steering wheel while pin 50 of connector D of M1 receives signals from the pushbuttons on the left of the steering wheel.The Body Computer M1 - connector G - is supplied directly from the battery via a line protected by maxifuse F2 of the engine compartment control unit B1; its ignition-controlled supply (INT) is received at pin 2 of connector D; pin 10 of connector H or M1 supplies the Body Computer with a reference earth.The Bluetooth control unit M162 is connected to the radio P20 - connector C - from pins 5, 22 and 21 with the AUX left, AUX right and AUX earth signals.The USB port P143 is connected to the Bluetooth control unit M162, to pins 3, 4, 19, 20 and 31 respectively, with signals: signal D+, reference earth, signal D-, 5V power supply and shielding.The handsfree microphone P26 is connected to pins 8 and 24 of M162.The navigation controls H135, located next to the front courtesy light, receive an ignition-controlled supply at pin 6 via the line for fuse F61 of the Body Computer; pin 5 is earthed.The command for the signalling LED reaches pin 4 from control unit M162, the referenc earth reaches pin 2 from pin 11 of M162, whilst the analogue signal for the buttons pressed leaves pin 1 for pin 28 of M162.