Actuator, Mode Door: Operation

The mode door actuator is connected to the A/C heater module through the vehicle electrical system by a dedicated two-wire lead and connector of the HVAC wire harness.

The mode door actuator can move the floor, defrost/demist and the panel-air doors in two directions. When the A/C heater module pulls the voltage on one side of the motor connection high and the other connection low, the mode-air doors will move in one direction. When the A/C heater module reverses the polarity of the voltage to the motor, the mode-air doors moves in the opposite direction.

When the A/C heater module makes the voltage to both connections high or both connections low, the mode-air doors stop and will not move. The A/C heater module uses a pulse-count positioning system to monitor the operation and relative position of the mode door actuator and the mode-air doors. The A/C heater module learns the mode-air doors stop position during the calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the mode door actuator circuits.

The mode door actuator is diagnosed using a scan tool. Refer to DIAGNOSTIC CODE INDEX .

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