pakundo

Hi fellow w215 owners....as the title says....i have tried the disconnecting both the battery cables and grounding(touching) it to each other(to reset)...but it just makes the rear window roll down once you open the door(same as passenger side) but it does not roll up......did anybody encountered this problem??? and also if its the module..would anybody pls. tell me the location.......i have also heard that even if you replaced the module that you still need to take it to the shop for reprogramming....is this true ??

thanks in advance for the inputs.......