How to Diagnose and Solve B1438 Wiper Mode Select Switch Circuit Failure Issues

Introduction

As a car owner, you may have experienced issues with your wiper mode select switch circuit. One of the most common issues is the B1438 wiper mode select switch circuit failure. This issue can be frustrating, especially during rainy seasons. However, with the right knowledge and tools, you can diagnose and solve this problem on your own. In this article, we will guide you through the process of diagnosing and solving B1438 wiper mode select switch circuit failure issues.

What is B1438 Wiper Mode Select Switch Circuit Failure?

B1438 is a diagnostic trouble code (DTC) that indicates a failure in the wiper mode select switch circuit. This code is usually triggered when there is a problem with the wiper mode select switch or its circuit. The wiper mode select switch is responsible for controlling the speed and mode of the wiper blades. When this switch fails, it can cause the wiper blades to stop working or work intermittently.

Diagnosing B1438 Wiper Mode Select Switch Circuit Failure

To diagnose B1438 wiper mode select switch circuit failure, you will need a scan tool that can read DTCs. Follow these steps:

Step 1: Connect the Scan Tool

Connect the scan tool to the OBD-II port of your car. The OBD-II port is usually located under the dashboard on the driver’s side.

Step 2: Read the DTCs

Read the DTCs using the scan tool. Look for the B1438 code in the list of DTCs. If the code is present, it means there is a problem with the wiper mode select switch circuit.

Step 3: Inspect the Wiper Mode Select Switch

Inspect the wiper mode select switch for any signs of damage or wear. Check the wiring and connectors for any loose connections or corrosion. If you find any issues, repair or replace the switch as necessary.

Step 4: Check the Wiper Motor

Check the wiper motor for any signs of damage or wear. Test the motor by turning on the wipers and observing their movement. If the motor is not working properly, replace it.

Step 5: Check the Wiper Relay

Check the wiper relay for any signs of damage or wear. Test the relay by swapping it with a known good relay of the same type. If the wipers start working properly, replace the faulty relay.

Solving B1438 Wiper Mode Select Switch Circuit Failure

Once you have diagnosed the B1438 wiper mode select switch circuit failure, you can proceed to solve the problem. Follow these steps:

Step 1: Replace the Wiper Mode Select Switch

If the wiper mode select switch is faulty, replace it with a new one. Make sure to get the right switch for your car’s make and model.

Step 2: Repair or Replace the Wiring and Connectors

If the wiring and connectors are damaged or corroded, repair or replace them as necessary. Make sure to use the right type of wiring and connectors for your car’s make and model.

Step 3: Replace the Wiper Motor

If the wiper motor is faulty, replace it with a new one. Make sure to get the right motor for your car’s make and model.

Step 4: Replace the Wiper Relay

If the wiper relay is faulty, replace it with a new one. Make sure to get the right relay for your car’s make and model.

Conclusion

B1438 wiper mode select switch circuit failure can be a frustrating issue for car owners. However, with the right knowledge and tools, you can diagnose and solve this problem on your own. Follow the steps outlined in this article to diagnose and solve B1438 wiper mode select switch circuit failure issues.

FAQs

1. Can I drive my car with B1438 wiper mode select switch circuit failure?

It is not recommended to drive your car with B1438 wiper mode select switch circuit failure. This issue can cause the wiper blades to stop working or work intermittently, which can be dangerous during rainy seasons.

2. How much does it cost to repair B1438 wiper mode select switch circuit failure?

The cost of repairing B1438 wiper mode select switch circuit failure depends on the extent of the damage and the cost of replacement parts. It is recommended to get a quote from a professional mechanic before proceeding with repairs.

3. How can I prevent B1438 wiper mode select switch circuit failure?

To prevent B1438 wiper mode select switch circuit failure, make sure to maintain your car’s wiper system regularly. Check the wiper blades, motor, and switch for any signs of wear or damage and replace them as necessary.