VUE AWD V6-3.5L VIN 4 (2004)
Air Door Actuator / Motor: Description and Operation
MODE ACTUATORS - DEFROST, PANEL AND FLOOR
The mode actuators are 5 wire bi-directional electric motors that incorporate a feedback potentiometer. Low reference, 5 volt reference, position signal,
and two control circuits enable the actuators to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When
the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the HVAC control module grounds one of the control
circuits while providing the other with 12 volts. The HVAC control module reverses the polarity of the control circuits to move the actuator in the
opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts.
The HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count
range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position
signal is sent to the module. Once the position signal and the commanded value are the same, the module removes power from both control circuits.
