The parking sensor control unitM84 is supplied at pin 1 of connector A by the ignition-operated line INT protected by fuse F49 of junction unit B2 with this line sending the power supply to the control unit M84 with reverse gear engaged (switch I20) this supply is also sent from pin 6 to pin 9 of connector A;pins 8 and 16 of connector A ofM84 are earthed.The control signals for activating the buzzerP44 are sent from pins 2 and 10 of connector A of M84.The four parking sensorsK97 are connected to connector B of control unit M84 pin 1 providing the reference earth, pin 6 the power supply and pin 2 the signal for the right interior sensor K97D.Similarly, pins 7, 10 and 3 for the left interior sensorK97C; pins 8, 11 and 4 for the right exterior sensorK97B;and pins 9, 12 and 5 for the left exterior sensorK97A;.