Compressor/Pump: Description and Operation

CIRCUIT DESCRIPTION
During raising of the vehicle height, a signal is sent is from terminal RC of the ECU to switch the AIR SUS relay on. As a result, the relay contacts close and the compressor motor turns, producing compressed air. At this time also, the ECU senses the amount of current flow to the compressor motor by means of the differences in potential at the terminals RM+ and RM- of the ECU. In this way, the ECU monitors the compressor circuit for abnormalities.