How is the BMW electric water pump circuit controlled?
1 Answers
BMW electric water pump circuit: The electric water pump on BMW engines is prone to burning out and getting damaged. There are a total of 4 wires on the electric water pump: the red wire supplies power to the electric water pump (constant 30 power supply). Another wire carries a second-stage signal from the engine control unit (ECU), which activates the second stage of the pump when the second stage is turned on. The next wire is the BSD control line; the electric water pump has a separate control module connected to the BSD sub-bus. The last wire is the ground wire for the electric water pump. BMW electric water pump circuit control process: It involves a motor driving the water pump, with an internal module. The engine control unit uses a signal wire to control the motor speed, thereby regulating the water pump's flow rate.