How to Diagnose and Solve B1571 Door Ajar LR Circuit Failure Issues

Introduction

As a car owner, it can be frustrating when you encounter problems with your vehicle. One of the most common issues is the B1571 Door Ajar LR Circuit Failure. This problem can cause your car’s interior lights to stay on, drain your battery, and even trigger your car alarm. In this article, we will guide you through the process of diagnosing and solving this issue.

What is B1571 Door Ajar LR Circuit Failure?

B1571 Door Ajar LR Circuit Failure is a diagnostic trouble code that indicates a problem with the left rear door ajar circuit. This issue can occur due to a faulty door switch, damaged wiring, or a malfunctioning control module. When this problem occurs, your car’s computer system will detect it and trigger the check engine light.

Diagnosing B1571 Door Ajar LR Circuit Failure

To diagnose this issue, you will need a diagnostic scanner that can read the trouble codes. Once you have the scanner, follow these steps:

Step 1: Check the Door Switch

The first thing you should do is check the left rear door switch. This switch is located on the door frame and is responsible for detecting whether the door is open or closed. Use a multimeter to check the switch’s continuity. If the switch is faulty, replace it.

Step 2: Check the Wiring

If the switch is working correctly, the next step is to check the wiring. Look for any signs of damage or corrosion on the wires. If you find any issues, repair or replace the wiring as necessary.

Step 3: Check the Control Module

If the switch and wiring are both in good condition, the problem may be with the control module. Use the diagnostic scanner to check for any fault codes related to the control module. If you find any issues, replace the control module.

Solving B1571 Door Ajar LR Circuit Failure

Once you have diagnosed the issue, it’s time to solve it. Here are some steps you can take to fix the problem:

Step 1: Replace the Door Switch

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

Step 2: Repair or Replace the Wiring

If the wiring is damaged, repair or replace it as necessary. Make sure to use the correct gauge wire and connectors.

Step 3: Replace the Control Module

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

Conclusion

B1571 Door Ajar LR Circuit Failure can be a frustrating issue to deal with, but with the right tools and knowledge, you can diagnose and solve the problem. Remember to check the door switch, wiring, and control module, and replace or repair any faulty components. By following these steps, you can get your car back to working order in no time.

FAQs

1. Can I drive my car with the B1571 Door Ajar LR Circuit Failure issue?

Yes, you can still drive your car with this issue, but it’s not recommended. The problem can drain your battery and cause other electrical issues.

2. How much does it cost to fix B1571 Door Ajar LR Circuit Failure?

The cost of fixing this issue can vary depending on the cause of the problem. Replacing the door switch or repairing the wiring can cost around $100-$200, while replacing the control module can cost around $500-$1000.

3. Can I fix B1571 Door Ajar LR Circuit Failure myself?

Yes, you can fix this issue yourself if you have the right tools and knowledge. However, if you’re not confident in your abilities, it’s best to take your car to a professional mechanic.