DTC B120: Twilight Delay Switch Pot Circuit: Description

The twilight delay uses a potentiometer to control the signal voltage to the BCM. The BCM supplies voltage on CKT 705 to the resistor in the left switch assembly and returns as a ground to the BCM on CKT 736, The wiper provides the voltage signal to the BCM on CKT 271 indicating position of the slider and delay time. When the slider is moved toward the MAX position, resistance is low, therefore, the BCM will see a high signal voltage. As the slider is moved toward the MIN position its resistance increases and the signal voltage decreases. This signal voltage will vary between zero volts (open or grounded circuit) and 5 volts (shorted to voltage).