If the pump does not function
If the pump not work check that the wiring between the relay and the pump are intact and that 12 V and ground are at the connector.
If there is no current in the connector and the Volvo Scan Tool (ST) does not give a diagnostic trouble code (DTC) the relay is defective and should be changed.
If the pump does not work and there is both current and ground the pump is defective and should be replaced.