How to Diagnose and Solve B1740 Mirror Driver Horizontal Switch Circuit Short To Ground Issues

Introduction

If you’re experiencing issues with your car’s mirror driver horizontal switch circuit, specifically a B1740 error code, you’re not alone. This issue can be frustrating and difficult to diagnose, but with the right tools and knowledge, you can fix it yourself. In this article, we’ll walk you through the steps to diagnose and solve B1740 mirror driver horizontal switch circuit short to ground issues.

What is the B1740 Error Code?

The B1740 error code is a diagnostic trouble code (DTC) that indicates a short to ground in the mirror driver horizontal switch circuit. This circuit controls the movement of the mirrors in your car, allowing you to adjust them to your desired position. When this circuit is shorted to ground, the mirrors may not move or may move erratically.

Diagnosing the Issue

To diagnose the B1740 error code, you’ll need a multimeter and a wiring diagram for your car. Here are the steps to follow:

Step 1: Check the Fuse

The first step is to check the fuse for the mirror driver horizontal switch circuit. Use your car’s manual to locate the fuse box and find the fuse for the mirrors. Use a multimeter to test the fuse for continuity. If the fuse is blown, replace it and test the circuit again.

Step 2: Check the Wiring

If the fuse is not the issue, the next step is to check the wiring for the mirror driver horizontal switch circuit. Use your car’s wiring diagram to locate the wires for the circuit. Use a multimeter to test the wires for continuity and for a short to ground. If you find a short to ground, you’ll need to repair or replace the damaged wire.

Step 3: Check the Switch

If the wiring is not the issue, the next step is to check the mirror driver horizontal switch. Use your car’s manual to locate the switch and remove it from the car. Use a multimeter to test the switch for continuity and for a short to ground. If the switch is faulty, you’ll need to replace it.

Solving the Issue

Once you’ve diagnosed the issue, it’s time to solve it. Here are the steps to follow:

Step 1: Repair or Replace the Wiring

If you found a short to ground in the wiring, you’ll need to repair or replace the damaged wire. Use a wire stripper to remove the damaged section of wire and splice in a new section. Use electrical tape or heat shrink tubing to secure the splice.

Step 2: Replace the Switch

If the switch is faulty, you’ll need to replace it. Use a screwdriver to remove the old switch and install the new one. Make sure to connect the wires correctly and test the circuit again.

Conclusion

Diagnosing and solving B1740 mirror driver horizontal switch circuit short to ground issues can be challenging, but with the right tools and knowledge, you can do it yourself. Remember to check the fuse, wiring, and switch, and repair or replace any damaged components. By following these steps, you’ll be able to fix the issue and get your mirrors working properly again.

FAQs

1. Can I drive my car with a B1740 error code?

It’s not recommended to drive your car with a B1740 error code, as it can affect the functionality of your mirrors. It’s best to diagnose and solve the issue before driving your car.

2. How much does it cost to fix a B1740 error code?

The cost to fix a B1740 error code can vary depending on the cause of the issue. If it’s a simple fix like a blown fuse, it may only cost a few dollars. If it’s a more complex issue like a faulty switch or wiring, it may cost several hundred dollars.

3. Can I fix a B1740 error code myself?

Yes, you can fix a B1740 error code yourself if you have the right tools and knowledge. Follow the steps outlined in this article to diagnose and solve the issue. If you’re not comfortable working on your car’s electrical system, it’s best to take it to a professional mechanic.