How to Diagnose and Solve B1812 Lamp Backup Switch Input Circuit Short To Battery Issues

Introduction

If you’re experiencing issues with your car’s backup switch, you may have encountered the B1812 Lamp Backup Switch Input Circuit Short To Battery error code. This code indicates that there is a short circuit in the backup switch input circuit, which can cause a variety of problems. In this article, we’ll discuss how to diagnose and solve this issue.

What is the Backup Switch?

The backup switch is a component in your car that is responsible for turning on the backup lights when you shift into reverse. It is typically located on the transmission or the shifter mechanism. When you shift into reverse, the backup switch sends a signal to the car’s computer, which then turns on the backup lights.

Diagnosing the B1812 Error Code

When you encounter the B1812 error code, it’s important to diagnose the issue correctly before attempting any repairs. Here are the steps to follow:

Step 1: Check the Backup Lights

The first step is to check if the backup lights are working. If they are not, it’s likely that there is an issue with the backup switch or the wiring. If the lights are working, move on to step 2.

Step 2: Check the Backup Switch

The next step is to check the backup switch itself. You can do this by disconnecting the switch and using a multimeter to test for continuity. If there is no continuity, the switch is faulty and needs to be replaced. If there is continuity, move on to step 3.

Step 3: Check the Wiring

The final step is to check the wiring between the backup switch and the car’s computer. You can do this by using a wiring diagram to trace the circuit and test for continuity. If there is a short circuit, you will need to repair or replace the wiring.

Solving the B1812 Error Code

Once you have diagnosed the issue, it’s time to solve the B1812 error code. Here are the steps to follow:

Step 1: Replace the Backup Switch

If the backup switch is faulty, you will need to replace it. This is a relatively simple process that involves disconnecting the old switch and connecting the new one.

Step 2: Repair or Replace the Wiring

If there is a short circuit in the wiring, you will need to repair or replace it. This can be a more complex process, as it involves tracing the circuit and identifying the location of the short circuit. If you’re not comfortable with this type of repair, it’s best to take your car to a professional mechanic.

Conclusion

The B1812 Lamp Backup Switch Input Circuit Short To Battery error code can be a frustrating issue to deal with, but with the right diagnosis and repair, it can be solved. By following the steps outlined in this article, you can identify the issue and take the necessary steps to fix it.

FAQs

1. Can I still drive my car if I encounter the B1812 error code?

Yes, you can still drive your car if you encounter the B1812 error code. However, you should be aware that your backup lights may not work, which can be a safety issue when backing up.

2. How much does it cost to repair the B1812 error code?

The cost of repairing the B1812 error code can vary depending on the extent of the damage. If it’s a simple issue with the backup switch, it may only cost a few hundred dollars to repair. If there is a more complex issue with the wiring, it could cost upwards of $1,000 to repair.

3. Can I fix the B1812 error code myself?

If you’re comfortable with diagnosing and repairing car issues, you may be able to fix the B1812 error code yourself. However, if you’re not experienced with car repairs, it’s best to take your car to a professional mechanic to avoid causing further damage.