How to Fix B1240 Wiper Washer Rear Pump Relay Circuit Failure

Introduction

If you’re experiencing issues with your wiper washer rear pump relay circuit, you may be wondering how to fix it. The B1240 code indicates a problem with the circuit, which can cause your wiper washer system to malfunction. Fortunately, with a few simple steps, you can diagnose and repair the issue yourself.

Step 1: Check the Fuse

The first step in fixing the B1240 code is to check the fuse. Locate the fuse box in your car and find the fuse for the wiper washer system. Check to see if the fuse is blown or damaged. If it is, replace it with a new one and test the system to see if the code has been resolved.

Step 2: Inspect the Wiring

If the fuse is not the issue, the next step is to inspect the wiring. Look for any signs of damage or wear on the wires that connect to the wiper washer rear pump relay circuit. If you find any damage, you will need to replace the damaged wires.

Step 3: Check the Relay

If the wiring is not the issue, the next step is to check the relay. The relay is responsible for sending power to the wiper washer rear pump. Locate the relay in your car and test it with a multimeter. If the relay is faulty, you will need to replace it with a new one.

Step 4: Replace the Pump

If the relay is not the issue, the final step is to replace the wiper washer rear pump. The pump is responsible for pumping the washer fluid to the rear wiper. If the pump is faulty, it will need to be replaced.

Conclusion

Fixing the B1240 code is a simple process that can be done at home with a few basic tools. By following these steps, you can diagnose and repair the issue yourself, saving time and money.

FAQs

1. Can I still use my wiper washer system if the B1240 code is present?

It is not recommended to use your wiper washer system if the B1240 code is present. This code indicates a problem with the circuit, which can cause the system to malfunction and potentially cause damage to your car.

2. How do I know if the relay is faulty?

You can test the relay with a multimeter to determine if it is faulty. If the multimeter shows that the relay is not sending power to the wiper washer rear pump, it is likely that the relay is faulty and needs to be replaced.

3. Can I replace the wiper washer rear pump myself?

Yes, you can replace the wiper washer rear pump yourself. However, it is important to follow the manufacturer’s instructions and use the correct tools to ensure that the replacement is done correctly.