B051A CHEVROLET – Left Side Assist Step Motor Control Circuit

 

B051A CHEVROLET Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B051A CHEVROLET Possible Causes

 

Faulty Left Side Assist Step Motor,Left Side Assist Step Motor harness is open or shorted,Left Side Assist Step Motor circuit poor electrical connection,Faulty Assist Step Control Module (ASC)

 

B051A CHEVROLET Description

 

The Assist Step Control Module (ASC) 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 ASC 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 ASC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.