The parking sensor control unit M084 receives a supply at pin 1 of connector A from the ignition-controlled INT line protected by fuse F49 of junction unit B002; pin 8 of connector A is earthed.The control unit is connected, via pins 7 and 4 of connector A and the CAN, to all the other nodes in the same network; in this way it receives, amongst others, the reverse gear engaged signal.It sends the commands for operating the buzzer to the instrument panel via the CAN.A system operation inhibition signal reaches pin 5 if a trailer is connected via coupling D073. See E2050 TRAILER WIRINGThe four parking sensors K097 are connected to connector B of control unit M084. Pin 1 supplies a reference earth, pin 6 a power supply, pins 5, 3, 2 and 4 are connected to sensors K097E, K097F, K097G and K097H respectively.