If you own a Harley-Davidson motorcycle, there’s a good chance that you’ve encountered a fault code at some point. One of the most common fault codes is B1319, which indicates that the left-hand control module (LHCM) down button is stuck. This can be frustrating, as it can prevent you from using certain features on your bike.

Fortunately, there are a few things you can do to diagnose and fix this issue. One option is to use a diagnostic tool to read the fault code and determine the root cause of the problem. Another option is to try resetting the LHCM by disconnecting the battery for a few minutes and then reconnecting it. If neither of these solutions works, you may need to replace the LHCM or take your bike to a professional mechanic for further diagnosis and repair.

Overall, while encountering a fault code like B1319 can be frustrating, it’s important to remember that it’s a common issue that can be resolved with the right tools and knowledge. By taking the time to diagnose and fix the problem, you can get back to enjoying your Harley-Davidson motorcycle.

Understanding Harley Diagnostic Codes

The Role of Diagnostic Trouble Codes

Harley-Davidson motorcycles are equipped with an onboard diagnostic system that monitors various components of the bike and detects any issues. When a problem is detected, the system generates a Diagnostic Trouble Code (DTC) that can be read using a diagnostic tool. DTCs help to pinpoint the source of the problem and make it easier to diagnose and fix the issue.

Interpreting Code B1319

Code B1319 is a DTC that is related to the Harley-Davidson’s radio, instruments, and BCM (Body Control Module). This code indicates a problem with the BCM and is usually caused by a faulty BCM or a wiring issue. When this code is generated, it can cause issues with the bike’s radio and instrument cluster.

To diagnose and fix this issue, you will need to use a diagnostic tool to read the code and determine the exact cause of the problem. Once you have identified the issue, you can take the necessary steps to fix it. This may involve replacing the BCM or repairing any damaged wiring.

It is important to note that attempting to fix this issue without the proper knowledge or tools can be dangerous and may cause further damage to the bike. It is recommended that you take your Harley-Davidson to an authorized dealer or mechanic to have the issue diagnosed and fixed properly.

In summary, DTCs play a crucial role in diagnosing issues with Harley-Davidson motorcycles. Code B1319 is a common DTC that is related to the bike’s radio, instruments, and BCM. If you encounter this code, it is important to have the issue diagnosed and fixed by a professional to ensure the safety and performance of your bike.

Electrical System Fundamentals

When it comes to your Harley-Davidson bike, understanding the electrical system fundamentals is essential. The electrical system is responsible for powering the bike’s various components, including the ignition system, lighting, and more. In this section, we will discuss the battery and charging system, as well as the ignition system overview.

Battery and Charging System

The battery is the heart of the electrical system, providing power to start the engine and run the various electrical components on your Harley-Davidson. It is important to keep the battery charged and in good condition to ensure reliable starting and operation of the bike.

The charging system is responsible for keeping the battery charged while the bike is running. It consists of the stator, regulator, and battery. The stator generates AC power, which is then converted to DC power by the regulator and sent to the battery. The regulator also controls the charging voltage to prevent overcharging and damage to the battery.

Ignition System Overview

The ignition system is responsible for starting the engine and keeping it running. It consists of the battery, ignition switch, ignition coil, spark plugs, and other components. When the ignition switch is turned on, power is sent to the ignition coil, which then generates a high voltage spark to ignite the fuel in the combustion chamber.

The ignition system is crucial for the proper operation of your Harley-Davidson. A malfunctioning ignition system can cause poor performance, starting problems, and even engine damage. It is important to keep the ignition system in good condition and perform regular maintenance to ensure reliable operation.

Understanding the basics of the electrical system, including the battery and charging system and the ignition system overview, is essential for maintaining and troubleshooting your Harley-Davidson bike. By keeping these components in good condition and performing regular maintenance, you can ensure reliable operation and prolong the life of your bike.

Harley Control Modules

Harley Davidson motorcycles are equipped with various control modules that manage different systems of the bike. These modules play a critical role in ensuring that your bike runs smoothly and efficiently. In this section, we will discuss the three primary control modules found on Harley Davidson motorcycles.

Body Control Module (BCM)

The Body Control Module (BCM) is responsible for managing various systems such as lighting, security, and the ignition switch. It receives input from various sensors and switches and sends output signals to different components. The BCM is also responsible for storing diagnostic trouble codes (DTCs) related to the systems it manages.

If you encounter a DTC related to the BCM, you can use the onboard diagnostics to access and confirm the code. For instance, the B1319 DTC indicates that the LHCM down button is stuck. To resolve this issue, you should check the connections to the BCM and ensure that they are clean and tight.

Radio and Sound System

Harley Davidson motorcycles come with a variety of radio and sound systems. These systems are designed to provide an enjoyable riding experience by offering high-quality audio and entertainment. The radio and sound system are managed by a separate control module that is responsible for controlling the functions of the radio, speakers, and other audio components.

If you encounter any issues with your radio or sound system, you should check the fuses and connections to ensure that they are in good condition. You can also use the onboard diagnostics to check for any DTCs related to the radio or sound system.

Conclusion

In conclusion, the control modules on your Harley Davidson motorcycle play a critical role in ensuring that your bike runs smoothly and efficiently. If you encounter any issues related to the BCM, radio, or sound system, you should use the onboard diagnostics to access and confirm the DTCs. You should also check the connections and fuses to ensure that they are in good condition. By taking these steps, you can resolve any issues and enjoy a smooth and enjoyable ride.

Troubleshooting Common Issues

If you’re experiencing issues with code B1319 on your Harley-Davidson, don’t worry! This guide will help you troubleshoot common issues that may be causing this error code to appear.

Starting Problems

If you’re having trouble starting your Harley-Davidson, there may be an issue with the ignition switch. Check to make sure that your ignition switch is turned on and that your battery is fully charged. If your battery is low, try charging it before attempting to start your motorcycle.

Fuel System Errors

Another common issue that can cause code B1319 to appear is a problem with the fuel system. Check to make sure that you have enough fuel in your tank and that your fuel lines are not clogged or damaged. If you suspect that there may be an issue with your fuel system, it’s best to take your motorcycle to a professional mechanic for diagnosis and repair.

Faceplate and Control Buttons

If you’re experiencing issues with the faceplate or control buttons on your Harley-Davidson, there may be an issue with the wiring or connections. Check to make sure that all of your wiring and connections are secure and that there are no loose or damaged wires. If you’re unsure about how to check your wiring and connections, it’s best to take your motorcycle to a professional mechanic for diagnosis and repair.

Remember, if you’re experiencing issues with code B1319 on your Harley-Davidson, it’s important to troubleshoot common issues before attempting any repairs. By following these simple steps, you can quickly and easily diagnose and fix any issues that may be causing this error code to appear.

Handlebar Switch Controls

Harley-Davidson motorcycles are equipped with various control modules that are responsible for managing different functionalities of the bike. One of the most important control modules is the handlebar switch control module.

The handlebar switch control module consists of two modules: the left-hand control module (LHCM) and the right-hand control module (RHCM). The LHCM is responsible for controlling the turn signals, horn, and high/low beam headlights. On the other hand, the RHCM is responsible for controlling the engine start/stop switch, the throttle, and the cruise control.

Left Hand Control Module (LHCM)

The LHCM is located on the left handlebar control and contains switches for the horn, turn signals, and high/low beam headlights. If you are experiencing code B1319, it could be due to a stuck down button on the LHCM. To troubleshoot this issue, you can try resetting the LHCM by pressing and holding the trip odometer reset switch while turning the ignition switch to the ON position.

Right Hand Control Module (RHCM)

The RHCM is located on the right handlebar control and contains switches for the engine start/stop switch, the throttle, and the cruise control. If you are experiencing code B1319, it could be due to a stuck info button on the RHCM. To troubleshoot this issue, you can try resetting the RHCM by disconnecting the battery for a few minutes and then reconnecting it.

Overall, the handlebar switch controls are an essential component of your Harley-Davidson motorcycle. Proper maintenance and troubleshooting of these controls can help ensure your bike runs smoothly and safely.

Advanced Diagnostics

Using Diagnostic Tools

When it comes to diagnosing issues with your Harley-Davidson, it’s important to have the right tools at your disposal. Diagnostic tools can help you quickly and accurately identify problems with your bike’s various systems, including the body control module (BCM).

One popular diagnostic tool for Harley-Davidson motorcycles is the Digital Technician II (DTII) system. This powerful tool allows you to read and interpret advanced diagnostic codes, including the B1319 code. With the DTII, you can quickly pinpoint the source of the problem and take the necessary steps to fix it.

Interpreting Advanced Codes

Advanced diagnostic codes like B1338, B1342, and B1346 can provide valuable insight into the health of your Harley-Davidson’s various systems. However, interpreting these codes can be challenging if you don’t have the right knowledge and experience.

When interpreting advanced codes, it’s important to pay attention to the specific details of the code. For example, the B1319 code indicates that the left-hand control module (LHCM) down button is stuck. This information can help you identify the specific part of your bike that needs attention.

It’s also important to keep in mind that advanced codes like B1338, B1342, and B1346 can have a variety of causes. In some cases, the problem may be a simple wiring issue, while in others it may be a more complex problem with the body control module (BCM). If you’re unsure about how to interpret an advanced code, it’s always a good idea to consult with a qualified Harley-Davidson technician.

By using diagnostic tools and interpreting advanced codes correctly, you can keep your Harley-Davidson running smoothly and avoid costly repairs down the road.

Maintenance and Prevention

Regular Maintenance Tips

Regular maintenance is essential to keep your Harley-Davidson running smoothly and prevent issues such as the B1319 code. Here are some tips to keep your motorcycle in good condition:

• Check your battery regularly and clean the terminals. A weak or dead battery can cause electrical issues.
• Inspect your wiring and connections for signs of wear, damage, or corrosion. Replace or repair any damaged or worn wires or connections.
• Keep your air filter clean and replace it when necessary. A dirty air filter can cause poor performance and affect the electrical system.
• Change your oil and filter regularly to keep your engine running smoothly.
• Check your tires for wear and proper inflation. Improper tire pressure can affect your motorcycle’s handling and performance.

Preventive Measures for Electrical Issues

Electrical issues can be frustrating and costly to repair. Here are some preventive measures to help you avoid issues such as the B1319 code:

• Use a battery tender or trickle charger to keep your battery charged when your motorcycle is not in use.
• Install a voltage regulator or stabilizer to regulate the voltage in your electrical system and prevent damage to your battery and other components.
• Avoid overloading your electrical system with accessories such as heated grips, extra lights, or a sound system. These accessories can put a strain on your battery and alternator.
• Keep your motorcycle clean and dry to prevent moisture and corrosion from affecting your electrical system.
• If you suspect an electrical issue, have it diagnosed and repaired by a qualified technician. Ignoring the issue can lead to more serious and costly problems down the road.

By following these maintenance and preventive measures, you can help keep your Harley-Davidson running smoothly and avoid issues such as the B1319 code.