How to Diagnose and Solve B1591 Autolamp Delay Decrease Circuit Failure Issues

Introduction

As a car owner, you may have experienced issues with your car’s lighting system. One of the most common problems is the B1591 Autolamp Delay Decrease Circuit Failure issue. This problem can be frustrating, especially when you need to drive at night or in low-light conditions. In this article, we will discuss how to diagnose and solve this issue.

What is the B1591 Autolamp Delay Decrease Circuit Failure Issue?

The B1591 Autolamp Delay Decrease Circuit Failure issue is a problem with the lighting system of your car. This issue occurs when the autolamp delay decrease circuit fails to function correctly. The autolamp delay decrease circuit is responsible for turning off the lights of your car after a certain period of time. When this circuit fails, the lights of your car may stay on, even when you turn off the engine.

Diagnosing the B1591 Autolamp Delay Decrease Circuit Failure Issue

To diagnose the B1591 Autolamp Delay Decrease Circuit Failure issue, you will need to follow these steps:

Step 1: Check the Fuses

The first step is to check the fuses of your car’s lighting system. The fuses are located in the fuse box, which is usually located under the dashboard or in the engine compartment. Check the owner’s manual to locate the fuse box and the fuses related to the lighting system. If you find a blown fuse, replace it with a new one.

Step 2: Check the Light Switch

The next step is to check the light switch of your car. The light switch is usually located on the dashboard or the steering column. Turn the switch on and off to see if the lights turn on and off accordingly. If the lights do not turn off, the problem may be with the light switch.

Step 3: Check the Autolamp Delay Decrease Circuit

The final step is to check the autolamp delay decrease circuit. This circuit is usually located in the lighting control module, which is located under the dashboard. Use a multimeter to check the voltage of the circuit. If the voltage is not within the specified range, the circuit may be faulty.

Solving the B1591 Autolamp Delay Decrease Circuit Failure Issue

To solve the B1591 Autolamp Delay Decrease Circuit Failure issue, you will need to follow these steps:

Step 1: Replace the Blown Fuse

If you found a blown fuse during the diagnosis, replace it with a new one. Make sure to use the correct type of fuse and the correct amperage.

Step 2: Replace the Light Switch

If the problem is with the light switch, you will need to replace it with a new one. Make sure to use the correct type of switch for your car’s make and model.

Step 3: Replace the Lighting Control Module

If the problem is with the autolamp delay decrease circuit, you will need to replace the lighting control module. This module controls the lighting system of your car and is responsible for the autolamp delay decrease circuit. Make sure to use the correct type of module for your car’s make and model.

Conclusion

The B1591 Autolamp Delay Decrease Circuit Failure issue can be frustrating, but it is not a difficult problem to diagnose and solve. By following the steps outlined in this article, you can diagnose and solve this issue and ensure that your car’s lighting system is functioning correctly.

FAQs

1. Can I drive my car with the B1591 Autolamp Delay Decrease Circuit Failure issue?

It is not recommended to drive your car with this issue, especially at night or in low-light conditions. The lights may stay on, which can drain the battery and cause other problems.

2. How much does it cost to replace the lighting control module?

The cost of replacing the lighting control module varies depending on the make and model of your car. It can range from $200 to $500.

3. Can I replace the light switch myself?

Replacing the light switch can be a DIY project, but it requires some knowledge of car mechanics. If you are not confident in your abilities, it is best to have a professional mechanic do it for you.