Function of rear door control module - GF72.29-P-4102-02A

Function 

The rear door control module on the driver and passenger-side receives requests to open or close the window via the CAN  bus. The control module actuates the built-in power window motor and senses the pulses from the Hall sensors in the power window motor for position recognition.  In addition the door control module recognizes actuation of the power window switch  in the rear door (S21/3)  or (S21/4)  .