Actuator, Mode Door: Operation

WARNING: This page is about a different variant/trim than selected.

The mode door actuator used in the Automatic Temperature Control (ATC) heating and A/C system is connected to the A/C heater control by a dedicated five-wire lead and connector of the Heating, Ventilation and Air Conditioning (HVAC) wire harness. The mode door actuator can move the mode-air doors in two directions. When the A/C heater control pulls the voltage on one side of the motor connection high and the other connection low, the mode door actuator will move in one direction. When the A/C heater control reverses the polarity of the voltage to the motor, the mode door actuator moves in the opposite direction. Once the A/C heater control makes the voltage to both connections high or both connections low, the mode door actuator stops and will not move.

The mode door actuator contains a potentiometer, which the ATC A/C heater control uses to monitor the relative position of the mode-air doors. The A/C heater control learns the mode-air door stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any problems it detects in the mode door actuator circuits. Refer to DIAGNOSTIC CODE INDEX .

The mode door actuator cannot be adjusted or repaired and must be replaced if inoperative or damaged.