Circuit/System Description
The Assist Step Control Module controls the running board actuators to extend or retract the running boards. Each actuator consists of an
electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The Assist
Step Control Module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the
voltage on the position signal circuit changes. The Assist Step Control Module supplies the actuator motor with a 12-volt control circuit and a
ground control circuit. The assist step module controls the direction of the actuator by changing the polarity of the control circuits.
Conditions for Running the DTC
