Harley Code B1357: How to Troubleshoot and Fix It

If you own a Harley-Davidson motorcycle, you may have encountered the B1357 code at some point. This code indicates that the SDARS antenna is shorted. The SDARS antenna is responsible for receiving satellite radio signals, so if it is shorted, you may experience issues with your radio or other related systems.

To diagnose the B1357 code, you can use the trip reset button on your Harley-Davidson without the need for a diagnostic tool. However, it is recommended to take your motorcycle to a professional mechanic for proper diagnosis and repair. Ignoring the B1357 code can lead to further damage to your motorcycle’s electrical system and potentially even cause safety hazards while riding.

In this article, we will explore the B1357 code in more detail, including its causes, symptoms, and possible solutions. We will also provide tips on how to prevent this code from appearing in the future. Whether you are experiencing this issue or simply want to be prepared in case it happens, this article will provide you with the information you need to keep your Harley-Davidson running smoothly.

Table of Contents

Understanding Harley Codes

Harley-Davidson motorcycles are equipped with a diagnostic system that can help you identify and troubleshoot issues. This system uses Diagnostic Trouble Codes (DTCs) to indicate the nature of the problem. Understanding these codes can help you diagnose issues with your motorcycle quickly and accurately.

Diagnostic Trouble Codes

DTCs are alphanumeric codes that indicate the nature of the problem. The first letter of the code indicates the system that is affected. For example, the letter “B” indicates a problem with the Body Control Module (BCM), while the letter “P” indicates a problem with the Powertrain Control Module (PCM).

Each code is composed of four digits. The first digit indicates the nature of the problem, while the remaining three digits provide more specific information about the issue. For example, the code “B1357” indicates that there is a problem with the Security Antenna Diagnostics.

The Role of the BCM

The BCM is a critical component of the Harley-Davidson diagnostic system. It is responsible for monitoring and controlling various systems on your motorcycle, including the radio, speedometer, and security system. When a problem is detected, the BCM will generate a DTC that can help you diagnose the issue.

One common DTC that is generated by the BCM is “B1357.” This code indicates that there is a problem with the security antenna diagnostics. This issue can be caused by a number of factors, including a shorted antenna or a faulty BCM.

In conclusion, understanding Harley codes is essential for diagnosing issues with your motorcycle quickly and accurately. By familiarizing yourself with the diagnostic system and the role of the BCM, you can troubleshoot problems with your motorcycle more effectively.

Electrical System Fundamentals

If you are experiencing the B1357 code on your Harley, it’s important to understand the fundamentals of your motorcycle’s electrical system. This will help you diagnose and fix the problem more effectively.

Battery Basics

Your motorcycle’s battery is a crucial component of its electrical system. It provides the power needed to start the engine and run the various electrical systems on your bike. The battery is typically located under the seat, and it’s important to keep it charged and in good condition.

To check the battery, use a voltmeter to measure its voltage. A fully charged battery should read around 12.6 volts. If the voltage is lower than this, it may need to be charged or replaced. It’s also important to check the battery’s terminals and cables for corrosion or damage.

Ignition System Components

The ignition system is responsible for starting the engine and keeping it running. It consists of several components, including the ignition switch, acc output, and h2 output. The ignition switch is located on the handlebars and is used to turn the bike on and off. The acc output provides power to accessories like lights and radios, while the h2 output provides power to the ignition system itself.

If you are experiencing the B1357 code, it may be related to a problem with one of these ignition system components. It’s important to check all of these components for damage or wear, as a faulty component can cause the code to appear.

In addition to these components, it’s also important to check the wiring and connections in your bike’s electrical system. Loose or damaged connections can cause a range of problems, including the B1357 code.

Harley Code B1357 Explained

If you have a Harley-Davidson motorcycle and are seeing the B1357 code, it means that there is a problem with the SDARS antenna. This code is usually caused by an internal error in either the left-hand control module (LHCM) or right-hand control module (RHCM), or a problem with the security antenna output.

The SDARS antenna is responsible for receiving satellite radio signals, and if it is shorted, it can cause the B1357 code to appear. This can happen due to a number of reasons, such as a damaged antenna or a wiring issue.

If the LHCM or RHCM is experiencing an internal error, it can also trigger the B1357 code. This can happen if there is a problem with the module’s software or hardware, or if there is a wiring issue.

Finally, the security antenna output can also cause the B1357 code to appear. This output is responsible for detecting the presence of a security fob, and if it is not functioning properly, it can cause the code to appear.

To diagnose and fix the B1357 code, it is recommended that you take your motorcycle to a qualified mechanic. They will use diagnostic tools to identify the root cause of the problem and then take appropriate action to fix it.

Overall, while the B1357 code can be frustrating to deal with, it is usually a relatively minor issue that can be fixed with the help of a professional mechanic.

Troubleshooting Common Issues

If you’re experiencing code B1357 on your Harley, there are a few common issues that could be causing the problem. In this section, we’ll explore some of the most likely culprits and how to troubleshoot them.

Fuel System Diagnostics

One of the most common causes of code B1357 is a problem with the fuel system. Specifically, your fuel pump may not be functioning properly. To diagnose this issue, you’ll need to check the fuel pump’s output pressure. If it’s lower than the manufacturer’s specifications, you may need to replace the fuel pump.

Lighting and Output Errors

Another possible cause of code B1357 is a problem with your brake lamp output. If this is the case, you’ll need to check your brake light switch and wiring to ensure that everything is working properly. You may also want to check your battery voltage, as a low voltage can cause BCM problems.

If you’re experiencing code B1300 or B1301, these are also related to lighting and output errors. Specifically, B1300 indicates a problem with your high beam switch, while B1301 indicates a problem with your low beam switch. To troubleshoot these issues, you’ll need to check the wiring and connections to your headlight switch.

Overall, if you’re experiencing code B1357 on your Harley, there are a few common issues that could be causing the problem. By checking your fuel system and lighting/output connections, you can diagnose and fix the issue quickly and easily.

Advanced Diagnostic Procedures

If you are experiencing code B1357 on your Harley Davidson, you may need to perform some advanced diagnostic procedures to determine the root cause of the issue. Here are some steps you can take to diagnose the problem:

ECU and Sensor Analysis

The first step in diagnosing code B1357 is to perform an analysis of the electronic control unit (ECU) and the sensor that is causing the issue. You can do this by using a diagnostic tool to scan the ECU and identify any faults. If the tool identifies a fault, you can then use the tool to read the sensor data and determine if the sensor is functioning properly.

Handling Internal Faults

If the diagnostic tool does not identify any faults with the ECU or sensor, you may need to investigate internal faults. Internal faults can be caused by a variety of factors, including damaged wiring or a faulty ECU. To diagnose internal faults, you can use a multimeter to test the wiring and check for continuity. You can also check the ECU for any signs of damage or corrosion.

In addition to these diagnostic procedures, it is important to check the vehicle speed sensor (VSS) and the engine control module (ECM) for any faults. You can do this by using the diagnostic tool to scan these components and identify any issues.

Overall, diagnosing code B1357 requires a thorough understanding of the Harley Davidson’s electronic systems and a careful analysis of the data provided by diagnostic tools. By following these advanced diagnostic procedures, you can identify the root cause of the issue and take the necessary steps to resolve it.

Repair and Replacement Guidelines

If your Harley is showing the B1357 code, you may be wondering what you can do to fix the problem. Here are some repair and replacement guidelines to help you get back on the road.

Switches and Circuit Fixes

One common cause of the B1357 code is a problem with the run/stop switch. This switch is located on the right handlebar and is used to turn the bike on and off. If the switch is dirty or worn out, it can cause electrical problems that trigger the B1357 code.

To fix this problem, you can try cleaning the switch with a contact cleaner or replacing the switch altogether. If you choose to replace the switch, be sure to get a genuine Harley part to ensure compatibility.

Another possible cause of the B1357 code is a problem with the circuit that controls the ignition system. This circuit can become damaged or worn out over time, especially if the bike is ridden in wet or dirty conditions.

To fix this problem, you may need to replace the wiring harness or other components of the ignition system. This can be a complex and time-consuming process, so it’s best to consult a professional mechanic if you’re not comfortable doing the work yourself.

Module Repairs

If the B1357 code is caused by a problem with the body control module (BCM), you may need to have the module repaired or replaced. The BCM is responsible for controlling many of the electrical systems on your Harley, including the ignition system.

To diagnose a problem with the BCM, you’ll need to use a diagnostic tool to read the error codes stored in the module. Once you’ve identified the problem, you can either repair the module yourself or take it to a professional mechanic for repair or replacement.

If you choose to repair the module yourself, be sure to follow the manufacturer’s instructions carefully and use only genuine Harley parts. If you’re not comfortable doing the work yourself, it’s best to take your bike to a professional mechanic who has experience working with Harley electrical systems.

By following these repair and replacement guidelines, you can help ensure that your Harley is running smoothly and safely. If you’re not sure what’s causing the B1357 code on your bike, don’t hesitate to consult a professional mechanic for help.

Maintaining Your Harley’s Electrical Health

As a Harley owner, you know that maintaining your bike is essential for optimal performance. One of the most crucial aspects of your Harley’s health is its electrical system. A well-maintained electrical system will ensure that your bike runs smoothly and efficiently.

To keep your Harley’s electrical system in excellent condition, you should perform regular maintenance checks. This includes checking the battery voltage, fuses, and connections. A low battery voltage can cause BCM problems, which can lead to issues with your bike’s electrical system. Make sure your battery voltage is at least 12.5 volts.

Check the fuses for the BCM and make sure they’re not blown. If you find any blown fuses, replace them immediately. Check the connections to the BCM and make sure they’re clean and tight. Loose connections can cause electrical issues that can be challenging to diagnose.

When it comes to specific codes such as B1310, B1312, and B1313, these codes indicate issues with the ignition switch. If you encounter any of these codes, you should have your ignition switch checked by a professional. Ignoring these codes can lead to more severe issues with your bike’s electrical system.

Regularly inspecting your Harley’s electrical system can save you time and money in the long run. If you’re unsure about how to perform these checks, consult your owner’s manual or take your bike to a professional mechanic. By maintaining your Harley’s electrical health, you’ll ensure that your bike runs smoothly and efficiently for years to come.

Additional Resources and Support

If you are experiencing Harley code B1357, there are several additional resources and support available to help you diagnose and fix the issue. Here are some tips that you can use to troubleshoot the issue:

Check the SDARS antenna: The B1357 code indicates that there is a short in the SDARS antenna. Check the antenna for any visible damage or loose connections. If you find any issues, repair or replace the antenna as necessary.

Check the wiring: The B1357 code can also be caused by a short circuit in the wiring. Inspect the wiring for any damage or wear and replace as necessary.
Use a code reader: If you are having trouble diagnosing the issue, consider using a code reader to read the diagnostic trouble codes (DTCs) stored in the vehicle’s computer system. This can help you identify the root cause of the problem.
Consult a professional: If you are unable to diagnose or fix the issue on your own, consider consulting a professional mechanic or technician. They can provide you with expert advice and help you repair the issue.

If you are experiencing other codes such as B1320, B1321, B1363, or B1364, the same troubleshooting tips may apply. It is always important to check the specific code and its corresponding description to determine the root cause of the issue.

Remember, proper maintenance and regular inspections can help prevent these codes from occurring in the first place. If you have any questions or concerns, don’t hesitate to reach out to your local Harley-Davidson dealership or mechanic for assistance.