How to Diagnose and Solve B1804 Lamp Turn Signal Rear Output Circuit Short To Battery Issues

Introduction

If you’re experiencing issues with your car’s turn signal, specifically the B1804 Lamp Turn Signal Rear Output Circuit Short To Battery error code, you’re not alone. This error code can be frustrating to deal with, but with the right knowledge and tools, you can diagnose and solve the issue on your own. In this article, we’ll provide you with step-by-step instructions and useful tips to help you fix the problem.

What is the B1804 Lamp Turn Signal Rear Output Circuit Short To Battery Error Code?

The B1804 error code indicates that there is a short circuit in the turn signal’s rear output circuit, which is causing it to draw power from the battery. This can cause the turn signal to malfunction or not work at all. The most common cause of this error code is a damaged or faulty wiring harness.

Diagnosing the Issue

To diagnose the issue, you’ll need a multimeter and a wiring diagram for your car’s turn signal system. Here are the steps to follow:

Step 1: Check the Wiring Harness

The first step is to check the wiring harness for any damage or wear. Start by disconnecting the battery and removing the turn signal assembly. Then, use a multimeter to check the continuity of the wiring harness. If there is no continuity, this indicates that there is a break in the wiring and it needs to be repaired or replaced.

Step 2: Check the Turn Signal Relay

If the wiring harness is in good condition, the next step is to check the turn signal relay. Use a multimeter to check the resistance of the relay. If the resistance is not within the manufacturer’s specifications, this indicates that the relay is faulty and needs to be replaced.

Step 3: Check the Turn Signal Switch

If the relay is in good condition, the next step is to check the turn signal switch. Use a multimeter to check the resistance of the switch. If the resistance is not within the manufacturer’s specifications, this indicates that the switch is faulty and needs to be replaced.

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 Harness

If the wiring harness is damaged or worn, it needs to be repaired or replaced. This can be done by a professional mechanic or by yourself if you have the necessary skills and tools.

Step 2: Replace the Turn Signal Relay

If the turn signal relay is faulty, it needs to be replaced. This can be done by a professional mechanic or by yourself if you have the necessary skills and tools.

Step 3: Replace the Turn Signal Switch

If the turn signal switch is faulty, it needs to be replaced. This can be done by a professional mechanic or by yourself if you have the necessary skills and tools.

Conclusion

Dealing with the B1804 Lamp Turn Signal Rear Output Circuit Short To Battery error code can be frustrating, but with the right knowledge and tools, you can diagnose and solve the issue on your own. By following the steps outlined in this article, you can get your turn signal working properly again.

FAQs

1. Can I drive my car with the B1804 error code?

It’s not recommended to drive your car with the B1804 error code as it can cause your turn signal to malfunction or not work at all, which can be dangerous.

2. How much does it cost to repair the B1804 error code?

The cost of repairing the B1804 error code can vary depending on the cause of the issue and the make and model of your car. It’s best to get a quote from a professional mechanic.

3. Can I fix the B1804 error code myself?

If you have the necessary skills and tools, you can fix the B1804 error code yourself. However, if you’re not confident in your abilities, it’s best to leave it to a professional mechanic.