P16C700 Heater support pump blocked

2016, 150 hk.
Hello have trouble code P16C700 heater support pump. Have tested switching pump with the egr pump and the pump are working there.

If i disconnect the pump and reconnecting it will run for some seconds.
Does anyone have a wiring diagram for the pumps?
Does anyone know if its supposed to work all the time, or is it starting by a sensor or something?
Does anyone know how the heater support pump work?
 
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