When the heater circuit fails, most of the time it will create an open circuit.
We recently had a 2007 BMW Z4 with the N52 engine in the shop. When diagnosing a faulty electric water pump, the first thing that needs to be done is to verify if there are any water pump-related diagnostic codes. There’s a very good chance there will be some. I then like to perform a visual inspection, but don’t look for the water pump from the top of the engine. You’ll want to drop the lower panels, and you will see the pump on the lower right side of the engine.