How to Diagnose and Solve B1738 Mirror Driver Horizontal Switch Circuit Open Issues

Introduction

If you’re experiencing issues with your car’s mirror driver horizontal switch circuit, you may have encountered the B1738 error code. This can be a frustrating problem to deal with, but with the right approach, it can be diagnosed and solved relatively easily. In this article, we’ll provide you with step-by-step instructions on how to diagnose and solve B1738 mirror driver horizontal switch circuit open issues.

What is the B1738 Error Code?

The B1738 error code is a diagnostic trouble code (DTC) that indicates an issue with the mirror driver horizontal switch circuit. This circuit is responsible for controlling the horizontal movement of your car’s mirrors. When this circuit is open, it means that there is a break in the electrical connection, which prevents the mirrors from moving horizontally.

Diagnosing the Issue

To diagnose the B1738 error code, you’ll need a few tools, including a multimeter and a wiring diagram for your car’s mirror driver horizontal switch circuit. Here are the steps to follow:

Step 1: Check the Fuse

The first thing you should do is check the fuse for the mirror driver horizontal switch circuit. If the fuse is blown, it can cause the circuit to open, which will trigger the B1738 error code. Use your car’s manual to locate the fuse box and check the fuse for the mirror driver horizontal switch circuit. If the fuse is blown, replace it and see if the error code disappears.

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 this circuit and check them for continuity using a multimeter. If there is a break in the wiring, it will cause the circuit to open, triggering the B1738 error code. If you find a break in the wiring, repair or replace the affected wires.

Step 3: Check the Switch

If the wiring is not the issue, the next step is to check the mirror driver horizontal switch itself. Use your multimeter to check the switch for continuity. If the switch is faulty, it can cause the circuit to open, triggering the B1738 error code. If you find that the switch is faulty, replace it with a new one.

Solving the Issue

Once you’ve diagnosed the issue and identified the cause of the B1738 error code, it’s time to solve the problem. Here are the steps to follow:

Step 1: Replace the Fuse

If the fuse was the issue, replace it with a new one. Make sure to use the correct amperage rating for your car’s mirror driver horizontal switch circuit.

Step 2: Repair or Replace the Wiring

If the wiring was the issue, repair or replace the affected wires. Make sure to use the correct gauge and color-coded wires for your car’s mirror driver horizontal switch circuit.

Step 3: Replace the Switch

If the switch was the issue, replace it with a new one. Make sure to use a switch that is compatible with your car’s mirror driver horizontal switch circuit.

Conclusion

Dealing with the B1738 error code can be frustrating, but with the right approach, it can be diagnosed and solved relatively easily. By following the steps outlined in this article, you can identify the cause of the issue and take the necessary steps to solve it.

FAQs

1. Can I drive my car with the B1738 error code?

It’s not recommended to drive your car with the B1738 error code, as it can affect the functionality of your mirrors. It’s best to diagnose and solve the issue as soon as possible.

2. How do I know if the mirror driver horizontal switch circuit is the issue?

If you’re experiencing issues with the horizontal movement of your car’s mirrors and have received the B1738 error code, it’s likely that the mirror driver horizontal switch circuit is the issue.

3. Can I diagnose and solve the issue myself?

If you have some experience with car repairs and have the necessary tools, you can diagnose and solve the B1738 error code yourself. However, if you’re not confident in your abilities, it’s best to take your car to a professional mechanic.