Mercedes w211 - MB w211 does not give air behind the suspension compressor.

Hello, MB w211 kombi does not want to pump the suspension, no pump, relay and filter new, pump checked efficient. On the display in the clocks zero information about the problem of lifting the suspension, the computer does not see the module from the suspension at all, as if it were not there, from the rear there is only a height potentiometer and an ordinary trumpet for air hoses, it has no air accumulator !! originally, after the relay is forced, the pump starts but does not release air anymore. I cordially ask everyone for help. It turns out that this is a regular system without a module, only on the height potentiometer, relay and pump

there is a swimmer in the trunk that does not allow the air to be withdrawn, check whether it is blurred or replace it with a new one