The electric water pump on a BMW is a vital component that helps to cool down the engine. It’s responsible for circulating coolant throughout the engine to ensure that it doesn’t overheat. If you’re looking to replace or repair your BMW electric water pump, then you need to have a proper understanding of the wiring diagram. In this article, we’ll discuss the BMW electric water pump wiring diagram, including the different components and how they connect.
Components of the BMW Electric Water Pump Wiring Diagram
Before we dive into the wiring diagram, let’s briefly go over the different components of the electric water pump. It consists of the pump itself, the control module, and the wiring harness.
The Pump
The pump is the main component responsible for circulating the coolant throughout the engine. It’s an electric pump that draws power from the car’s electrical system.
The Control Module
The control module is responsible for regulating the electric water pump’s power output. It receives input from the car’s computer and adjusts the pump’s speed accordingly.
The Wiring Harness
The wiring harness is the collection of wires that connect the electric water pump to the car’s electrical system. It includes various connectors and sensors that allow the control module to regulate the pump’s output.
The BMW Electric Water Pump Wiring Diagram
Now that we’ve gone over the different components let’s take a look at the actual wiring diagram.
| Wire Color | Function |
|---|---|
| Brown/Red | Positive (+) wire |
| Brown | Negative (-) wire |
| Black/Yellow | Ground wire |
| Green/Orange | Signal wire |
The wiring diagram consists of four wires: a positive wire, a negative wire, a ground wire, and a signal wire. The positive wire is brown/red, the negative wire is brown, the ground wire is black/yellow, and the signal wire is green/orange.
Wiring the Control Module
The first step in wiring the electric water pump is connecting the control module to the car’s computer. To do this, you’ll need to locate the control module and the computer’s wiring harness.
The control module should have a connector with four pins. You’ll need to connect the green/orange signal wire to pin two, the brown ground wire to pin three, and the brown/red positive wire to pin four. The brown negative wire does not need to be connected to the control module.
Connecting the Pump to the Control Module
Once you’ve wired the control module, you’ll need to connect the electric water pump to it. You’ll need to locate the wiring harness that connects the pump to the control module.
The harness should have a connector with four pins. You’ll need to connect the green/orange signal wire to pin two, the black/yellow ground wire to pin three, the brown/red positive wire to pin four, and the brown negative wire to pin one.
Frequently Asked Questions (FAQ)
Q: Why is the electric water pump so important?
A: The electric water pump is important because it helps to cool down the engine. If the engine overheats, it can cause serious damage and lead to costly repairs.
Q: How do I know if my electric water pump needs to be replaced?
A: If you notice that your engine is running hotter than usual or that the coolant level is low, then it’s a sign that your electric water pump may need to be replaced. You may also hear strange noises coming from the engine compartment.
Q: Can I replace the electric water pump myself?
A: While it’s possible to replace the electric water pump yourself, it’s recommended that you have a professional do it. Replacing the pump requires specialized tools and knowledge, and if done incorrectly, it can cause serious damage to your engine.
Q: How much does it cost to replace the electric water pump on a BMW?
A: The cost of replacing the electric water pump on a BMW varies depending on the model of the car and where you live. On average, it can cost anywhere from $500 to $1,200.
Q: How long does an electric water pump last?
A: The lifespan of an electric water pump varies depending on the amount of use and how well it’s maintained. On average, an electric water pump can last anywhere from 60,000 to 100,000 miles.
