Mercedes Forum - Mercedes Benz Enthusiast Forums

hi ive recently brought a mercedes est 7 seater e200 and there is no central locking on it bloke said it was key fob but when i changed the batteries there is a red light that come on key fob but nothing happens when trying the doors but when i open the boot up there is a noise like central locking workin but still wont open doors up i have to go though passenger side and lean over pushing down bitton on front door still does not lock the rest of doors either its a keyless drivers door any clues pls