RAM 2500 Truck 2WD L6-6.7L DSL Turbo (2010)
Air Door Actuator / Motor: Description and Operation
Mode Door Actuator - Operation
OPERATION
The mode door actuators are connected to the A/C-heater control through the vehicle electrical system by dedicated two-wire leads and connectors of the
HVAC wire harness. The mode door actuators can move the defrost-air door and the panel/floor-air door 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-air door will move in one direction. When the
A/C-heater control reverses the polarity of the voltage to the motor, the mode-air door moves in the opposite direction.
When the A/C-heater control makes the voltage to both connections high or both connections low, the mode-air door stops and will not move. The
A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the mode door actuators and the mode-air
doors. The A/C-heater control learns the mode-air door stop positions during the Actuator Calibration procedure and will store a Diagnostic Trouble
Code (DTC) for any problems it detects in the mode door actuator circuits.
The mode door actuators are diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The mode door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.