Description And Operation: Operation

The rear blend door actuator is connected to the A/C heater control in the ICS module through the vehicle electrical system by a dedicated two-wire lead and connector of the HVACR wire harness. The rear blend door actuator can move the rear blend-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 rear blend-air door will move in one direction. When the A/C heater control reverses the polarity of the voltage to the motor, the rear blend-air door moves in the opposite direction. When the front A/C heater control makes the voltage to both connections high or both connections low, the rear blend-air door stops and will not move.

The front A/C heater control in the ICS module uses a pulse-count positioning system to monitor the operation and relative position of the rear blend door actuator and the rear blend-air door. The front A/C heater control learns the rear blend-air door stop positions during the calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the rear blend door actuator circuits.

The rear blend door actuator is diagnosed using a scan tool. Refer to STANDARD PROCEDURE .

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