Auxiliary Coolant Pump
WARNING: This page is about a different car, the 2018 Land Rover Discovery Sport. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary coolant pump is an electric pump attached on a bracket, at the rear left side of the engine.
When the engine is turned off the auxiliary coolant pump provides engine coolant flow to prevent engine coolant boiling in the turbocharger and in the integrated exhaust manifold.
The auxiliary coolant pump has a three pin connector. One pin receives a permanent battery voltage, supplied from a fused output from the Battery Junction Box (BJB). The second pin has a hardwired connection to the PCM and the third pin has a ground connection.