Originally Posted by zip439

If car does not start without the batteries in the FOB, it indicates that the security air pump in the trunk is not working properly. You should go under the rear of the car and cut a small slit in the rubber plugs (you will see two) . The plugs are located to the rear of the axle. twist a little and see if water comes out. If you find water it indicates that you have a problem in the area under the styrofoam. That is where the air pump that locks/unlocks the door is located.
Here in the USA the air pump is located on the right (passenger) side of the car, but in europe it may be different.