Bosch Wiper Motor Wiring Diagram: A Comprehensive Guide

If you’re looking to replace the wiper motor in your car, you’re probably wondering how to wire it up. The process can be complicated, especially if you’re not familiar with electrical systems. In this article, we’ll walk you through the process step-by-step and provide you with all the information you need to get the job done right. We’ll also include some frequently asked questions and tables to help you understand the process better.

What is a Wiper Motor?

A wiper motor is a small electric motor that is responsible for powering the wipers on your car. It is usually located under the hood near the windshield and is connected to the wiper arm via a series of gears and linkages. When you turn on your wipers, the motor spins, which in turn causes the wiper arms to move back and forth across the windshield.

Wiper motors come in different shapes and sizes depending on the make and model of your car. Bosch wiper motors are a popular choice for many cars, and they are known for their reliability and durability. They are also relatively easy to install, provided you know how to wire them correctly.

How to Wire a Bosch Wiper Motor

The first step in wiring a Bosch wiper motor is to gather all the necessary tools and materials. You’ll need a wrench or socket set, wire strippers, electrical tape, and a wiring diagram for your particular motor. Once you have everything you need, follow these steps:

Step 1: Disconnect the Battery

Before you begin wiring your wiper motor, it’s essential to disconnect the battery to avoid any electrical shocks or accidents. Locate the negative terminal on your battery and loosen the nut with a wrench. Once the nut is loose, remove the cable from the terminal and tuck it away from any metal parts to prevent accidental contact.

Step 2: Remove the Old Motor

Next, you’ll need to remove the old wiper motor from your car. Locate the motor under the hood near the windshield and disconnect any wires or connectors that are attached to it. Use a wrench or socket set to remove any bolts or screws that are holding the motor in place. Once the motor is free, carefully remove it from the car and set it aside.

Step 3: Install the New Motor

Now it’s time to install the new wiper motor. Locate the mounting holes on the motor and line them up with the corresponding holes on your car. Use bolts or screws to secure the motor in place, making sure it’s tight and secure.

Step 4: Connect the Wires

Once the new motor is in place, it’s time to connect the wires. Refer to the wiring diagram that came with your motor to determine which wires connect to which terminals. Strip the ends of the wires using wire strippers and twist them together. Use electrical tape to cover the twisted ends, making sure there are no exposed wires.

Step 5: Test the Motor

Before you reconnect the battery, it’s essential to test the motor to make sure it’s working correctly. Turn the key in the ignition and activate your wipers. The motor should spin smoothly, and the wipers should move back and forth across the windshield. If the motor is not working correctly, check your wiring connections and refer to the wiring diagram to make sure everything is connected properly.

Step 6: Reconnect the Battery

Once you’re satisfied that the motor is working correctly, it’s time to reconnect the battery. Replace the negative terminal cable and tighten the nut with a wrench. Close the hood and take your car for a test drive to ensure your wipers are functioning correctly.


Q: What should I do if my wipers are not working correctly after installing a new motor?

A: If your wipers are not working correctly, there may be an issue with your wiring. Check all your connections and refer to the wiring diagram to make sure everything is connected correctly. If you’re still having issues, it’s best to consult a professional mechanic to troubleshoot the problem.

Q: How can I tell if my wiper motor is failing?

A: If your wipers are moving slowly or stuttering, or if they’re not moving at all, there may be an issue with your wiper motor. Other signs of a failing motor can include strange noises or burning smells coming from under the hood. If you suspect your wiper motor is failing, it’s best to replace it as soon as possible to avoid any safety hazards on the road.


Wiring a Bosch wiper motor may seem overwhelming at first, but with the right tools and knowledge, it’s a relatively straightforward process. Follow the steps outlined above and refer to the wiring diagram to ensure everything is connected correctly. With a little patience and practice, you’ll have your wipers up and running in no time!