Abstract: A pump system for a vehicle having an electronic control unit (ECU) for operating the pump system includes a pump assembly having a motor and a pump controller with a command input communicating with the ECU of the vehicle. The pump controller is configured to determine whether a command input of the pump controller is selectively connected to the ECU of the vehicle, and also the pump controller is operable in at least two modes including a first mode which utilizes a valid pulse width modulation (PWM) input from the ECU when the pump controller is in communication with the ECU and a second mode which utilizes a discrete digital input for controlling a speed of the pump assembly when the pump controller is not in communication with the ECU.