How to Diagnose and Solve B1894 Wiper Rear Motor Speed Sense Circuit Failure Issues

Introduction

If you’re experiencing issues with your wiper rear motor speed sense circuit, you may have encountered the B1894 error code. This code indicates that there is a problem with the circuit that controls the speed of your rear wiper motor. Fortunately, diagnosing and solving this issue is relatively straightforward, and with a few simple steps, you can get your wiper motor back up and running in no time.

Step 1: Check the Fuse

The first step in diagnosing a B1894 error code is to check the fuse that controls the wiper motor. Locate the fuse box in your car and find the fuse that corresponds to the wiper motor. Check the fuse to see if it has blown. If it has, replace it with a new fuse of the same amperage.

Step 2: Check the Wiring

If the fuse is not the issue, the next step is to check the wiring that connects the wiper motor to the rest of the circuit. Look for any signs of damage or wear, such as frayed wires or loose connections. If you find any issues, repair or replace the wiring as necessary.

Step 3: Check the Wiper Motor

If the fuse and wiring are both in good condition, the problem may be with the wiper motor itself. To check the motor, you’ll need to remove it from the car and test it with a multimeter. Set the multimeter to measure resistance and touch the probes to the motor’s terminals. If the multimeter reads infinite resistance, the motor is likely faulty and will need to be replaced.

Step 4: Replace the Wiper Motor

If the motor is faulty, you’ll need to replace it with a new one. You can purchase a replacement motor from your local auto parts store or online. To replace the motor, follow the manufacturer’s instructions carefully, making sure to connect all the wires and fasteners securely.

Step 5: Test the Wiper Motor

Once you’ve replaced the motor, test it to make sure it’s working correctly. Turn on the wipers and observe the motor’s speed. If the wipers are working correctly, the B1894 error code should no longer be present.

Conclusion

Diagnosing and solving a B1894 error code is relatively straightforward, and with a few simple steps, you can get your wiper motor back up and running in no time. By checking the fuse, wiring, and motor, you can identify the source of the problem and take the necessary steps to fix it.

FAQs

1. Can I drive my car with a B1894 error code?

It’s generally not recommended to drive your car with a B1894 error code, as it indicates a problem with the wiper motor that could cause it to fail unexpectedly. It’s best to diagnose and solve the issue as soon as possible to avoid any potential safety hazards.

2. How much does it cost to replace a wiper motor?

The cost of replacing a wiper motor can vary depending on the make and model of your car and the cost of the replacement part. On average, you can expect to pay between $100 and $300 for a new wiper motor, plus the cost of labor if you have it installed by a mechanic.

3. Can I replace a wiper motor myself?

Replacing a wiper motor can be a relatively straightforward DIY project if you have some experience working on cars. However, if you’re not confident in your abilities, it’s best to have the motor replaced by a professional mechanic to ensure it’s installed correctly and safely.