Compressor/Pump Relay: Description and Operation

^ A relay is needed because the control module cannot directly provide the high current needed to run the compressor motor. It operates as follows:
^ The control module grounds Circuit 420 (DB/Y) to energize the relay coil.
^ When energized, the coil creates a magnetic field which closes the relay contacts, connecting Circuit 1053 (LB/PK) to Circuit 538 (GY/R).
^ High current then flows from battery to the compressor motor.