Assisted Mercedes A address is disconnected

I have a problem with the assisted direction, when I take the car it goes well but when going to park the direction is disconnected when I turn the steering wheel to the top (I suppose it is electric), I have to stop the car and start again so that it works, it is from the year 98 if someone can know what it is due to what would be appreciated, a greeting

Hello, in your class A there are models that the majority or zipper hydraulics has it that is also called assisted if it is electric you have to look at the relief or the direction of the direction if it is from the other is the zipper. A greeting.

Thank you very much, how can I know where the switchboard is, greetings