Hello - we don't have the E200 in our manuals so I am going to walk through were I think it should be. First, yes it can be fixed. Next it should be located below the right side of the dash above the feet of the passenger.
I have attached a pic from a E320 to give you an idea. Disconnect the cannon plug and put 12v to the red wire and ground the black that go to the motor. It should come on. If it doesn't then the motor is bad change it out