An ignition operated power supply (INT) from instrument E50 reaches pin 1 of connector A through body computer M01, pin 31 connector F, from a line protected by fuse F37 of under-dashboard junction unit B02.Instrument E50 is also supplied directly from the battery - pin 3 of connector A - (for Natural Power version - 1596 16V BPW - pin 2 of connector A) via the body computer, pin 3 of connector D, from a line protected by fuse F53 contained in under-dashboard junction unit B02.Body computer M01 and control panel E50 communicate with one another to exchange information on the correct operation of the devices present in the vehicle respectively from pins 5 and 6 of connector D and pins 9 and 8 of connector A (for the Natural Power version - 1596 16V BPW - pins 3 and 4 of connector A).The instrument panel is also earthed via the body computer, from pin 2 connector A (for the Natural Power version - 1596 16V BPW - pin 7 of connector A).Body computer M01 receives and processes a set of signals:- fuel quantity from the level gauge built into fuel pump N40, pins 4 and 15 connector A;- vehicle speed from speedometer sensor K84, pin 17 connector C.The zero or scroll command for values shown on the multifunctional display reaches pin 4 connector A of instrument panel E50 from steering wheel stalk unit H05, pin 1 connector C.For the Natural Power - 1596 16V BPW version - the parameter scroll key is located on the panel.