Universal Replacement Controller Standard Type B (AMP19-04280-STB)Restore the smart functionality of your electric running boards with the AMP Research Type B Standard Replacement Controller. As the "brain" of the PowerStep system, this controller processes signals from your vehicle to manage the precise timing, speed, and safety of the step deployment and retraction. If your steps have stopped responding to door triggers or exhibit inconsistent movement, replacing the controller is often the solution to return your