If you own a Harley-Davidson motorcycle, you may have encountered an error code B1103. This code refers to an internal error in the left-hand control module (LHCM) that controls the turn signal. The error message indicates that there is a fault in the LHCM, and you should take your motorcycle to a dealer for repair as soon as possible.

The LHCM is a critical component of your motorcycle’s electrical system, and it is responsible for controlling the left-hand turn signal. When the LHCM detects an error, it will trigger the B1103 code and display the error message on your motorcycle’s instrument panel. If you ignore this error message and continue riding your motorcycle, you may experience issues with your turn signal, which can be dangerous.

If you are experiencing the B1103 error code, it is important to take your motorcycle to a qualified Harley-Davidson dealer for repair. The dealer will be able to diagnose the issue and repair or replace the LHCM as needed. It is essential to address this issue promptly to ensure the safety and proper functioning of your motorcycle.

Understanding Diagnostic Trouble Codes (DTCs)

The Role of DTCs in Motorcycle Diagnostics

Diagnostic Trouble Codes (DTCs) are alphanumeric codes generated by the onboard computer system of your Harley-Davidson motorcycle. They play a crucial role in diagnosing problems with your motorcycle and can help you identify the root cause of issues.

DTCs are stored in the Electronic Control Unit (ECU) and the Body Control Module (BCM) of your motorcycle. They are generated when the ECU or BCM detects a problem with a specific component or system. The codes are then stored in the ECU or BCM until they are cleared using a diagnostic tool.

Interpreting the B1103 Code

The B1103 code is a DTC that is associated with the Body Control Module (BCM) of your Harley-Davidson motorcycle. This code indicates that there is an internal error with the turn signal system.

To diagnose the problem, you should start by checking the turn signals to see if they are functioning properly. If the turn signals are not working, you should check the fuses and wiring to ensure that they are not damaged or disconnected. If the turn signals are working, but the code persists, you may need to replace the BCM.

It is important to note that the B1103 code is just a starting point for diagnosing the problem with your motorcycle. You should always refer to the Harley-Davidson trouble code chart or consult the service manual provided by the manufacturer to interpret the code correctly.

In conclusion, DTCs are an essential tool for diagnosing problems with your Harley-Davidson motorcycle. The B1103 code is just one example of a code that can help you identify issues with your motorcycle’s turn signal system. By understanding the role of DTCs and interpreting them correctly, you can quickly and accurately diagnose problems with your motorcycle and keep it running smoothly.

Electrical System Fundamentals

If you’re experiencing trouble with your Harley-Davidson’s electrical system, it’s important to have a basic understanding of how it works. This section will cover the fundamentals of the battery and ignition system, as well as the CAN network.

Battery and Ignition System Basics

Your Harley-Davidson’s battery is responsible for providing power to the entire electrical system, including the ignition system. It’s important to keep your battery in good condition, as a weak or dead battery can cause a variety of issues.

The ignition system is responsible for starting your motorcycle and keeping it running. It’s made up of several components, including the ignition switch, starter motor, and spark plugs. If any of these components are not working properly, your motorcycle may not start or may run poorly.

Understanding the CAN Network

The CAN (Controller Area Network) network is a communication system that allows various components of your Harley-Davidson to communicate with each other. This includes the ECU (Engine Control Unit) and BCM (Body Control Module).

If you’re experiencing trouble with your Harley-Davidson’s electrical system, it’s possible that there is an issue with the CAN network. This can cause a variety of symptoms, including trouble starting your motorcycle, warning lights on your dashboard, and more.

It’s important to have a basic understanding of the electrical system in your Harley-Davidson. By understanding the basics of the battery and ignition system, as well as the CAN network, you’ll be better equipped to diagnose and repair any issues that may arise.

Body Control Module (BCM) Insights

BCM Functions and Harley Code B1103

The Body Control Module (BCM) is a crucial component in Harley Davidson motorcycles that controls various electrical systems and functions, such as lighting, turn signals, and ignition. The BCM communicates with other modules in the motorcycle, such as the security module and the instrument cluster, to ensure that all systems are working properly.

One of the common issues that can occur with the BCM is the B1103 code, which indicates a front turn signal output fault. This fault can be caused by a variety of issues, such as a faulty bulb, a damaged wiring harness, or a malfunctioning BCM.

Troubleshooting BCM Issues

If you are experiencing issues with your Harley Davidson motorcycle, such as a malfunctioning turn signal or brake lamp, it is important to troubleshoot the BCM to determine the root cause of the problem. One way to do this is to use the onboard diagnostics to confirm diagnostic trouble codes (DTCs) stored under the BCM.

To troubleshoot the BCM, you can follow these steps:

1. Check the wiring harness for any damage or corrosion.
2. Inspect the bulbs to ensure that they are functioning properly.
3. Use a multimeter to check the voltage at the BCM connectors.
4. If the voltage is not within the specified range, replace the BCM.

By following these troubleshooting steps, you can identify and resolve issues with your Harley Davidson motorcycle’s BCM and ensure that all electrical systems are functioning properly.

Left Hand Control Module (LHCM)

If you own a Harley-Davidson motorcycle, then you may have come across the B1103 error code, which is related to the Left Hand Control Module (LHCM). This section will provide you with some information on LHCM and how to resolve LHCM faults.

Identifying LHCM Internal Error

The LHCM is responsible for controlling various functions on your motorcycle, including turn signals, horn, and high beam. When the LHCM encounters an internal error, it will trigger the B1103 error code. This code indicates that there is a fault within the LHCM, which could be caused by a wiring issue or a malfunction in the LHCM itself.

If you experience any of the following issues, it may be due to an LHCM internal error:

• Turn signals not working
• Horn not working
• High beam not working
• Error code B1103 displayed on the dashboard

Resolving LHCM Faults

If you encounter an LHCM internal error, there are a few things you can do to resolve the issue. Before attempting any repairs, it is recommended to consult with a professional Harley-Davidson mechanic.

Here are some steps you can take to resolve LHCM faults:

1. Check the LHCM wiring: The first step is to check the wiring connections to the LHCM. Make sure that all the wires are properly connected and there are no loose connections.

2. Replace LHCM: If the wiring is not the issue, then the LHCM may need to be replaced. You can purchase a new LHCM from an authorized Harley-Davidson dealer.

3. Clear the error code: Once you have resolved the issue, you will need to clear the error code from the dashboard. You can do this by using a diagnostic tool or by disconnecting the battery for a few minutes.

In conclusion, LHCM internal error can cause various issues on your Harley-Davidson motorcycle. If you encounter this error, it is important to take the necessary steps to resolve the issue as soon as possible. By following the steps outlined in this section, you can ensure that your motorcycle is functioning properly and safely.

Right Hand Control Module (RHCM)

If you own a Harley-Davidson motorcycle, you may have heard of the Right Hand Control Module (RHCM). This is a module that controls various functions on the right side of your handlebar, including the turn signals, horn, and cruise control. In this section, we will discuss the functions of the RHCM and how to address any internal errors that may occur.

RHCM and Its Functions

The RHCM is an essential component of your motorcycle’s electrical system. It controls the turn signals, horn, and cruise control, among other things. When you activate the turn signal switch on your handlebar, the RHCM sends a signal to the turn signal module to turn on the corresponding turn signal. Similarly, when you press the horn button, the RHCM sends a signal to the horn module to activate the horn.

Addressing RHCM Internal Error

If you encounter an RHCM internal error, it means that there is a problem with the module itself. One common error code associated with the RHCM is B2114, which indicates a turn signal out. This error occurs when the RHCM detects that one of the turn signals is not functioning correctly. To address this error, you should check the turn signal bulbs and wiring to ensure that everything is properly connected and functioning.

Another error code associated with the RHCM is B1103, which indicates an internal error. If you encounter this error, it means that there is a problem with the RHCM itself. To address this error, you should check the wiring and connections to ensure that everything is properly connected. If you are unable to resolve the issue, you may need to replace the RHCM.

In conclusion, the RHCM is an essential component of your Harley-Davidson motorcycle’s electrical system. It controls various functions on the right side of your handlebar, including the turn signals, horn, and cruise control. If you encounter an internal error with the RHCM, you should check the wiring and connections to ensure that everything is properly connected. If you are unable to resolve the issue, you may need to replace the RHCM.

Sensor and Switch Diagnostics

When your Harley-Davidson motorcycle is experiencing issues with the engine, it can be frustrating and concerning. One of the most common error codes that you may encounter is B1103. This code indicates an internal error in the left-hand control module (LHCM) or the right-hand control module (RHCM).

To diagnose the issue, you will need to perform sensor and switch diagnostics. This will help you determine whether the MAP sensor, ET sensor, IAT, ISS, or the run/stop switch is causing the problem.

MAP and ET Sensor Functionality

The MAP sensor and ET sensor are responsible for measuring the air pressure and temperature in the intake manifold. These sensors provide critical data to the engine control module (ECM), which uses it to adjust the fuel injection and ignition timing.

If the MAP or ET sensor is malfunctioning, it can cause your motorcycle to run poorly or not start at all. To test these sensors, you will need a digital multimeter (DMM) and a service manual for your specific model.

Troubleshooting the Run/Stop Switch

The run/stop switch is another critical component that can cause error code B1103. This switch is located on the right-hand control module and is responsible for turning the motorcycle on and off.

If the switch is malfunctioning, it can cause your motorcycle to stall or not start at all. To diagnose the issue, you will need to test the switch using a DMM and a service manual for your specific model.

In conclusion, error code B1103 can be frustrating, but with the right tools and knowledge, you can diagnose and fix the issue. By performing sensor and switch diagnostics, you can determine whether the MAP sensor, ET sensor, IAT, ISS, or the run/stop switch is causing the problem. Remember to always consult your service manual and use caution when working on your motorcycle.

Advanced Troubleshooting Techniques

When it comes to troubleshooting Harley Davidson BCM problems, it’s important to have a good understanding of the various error codes that can arise. One of the most common codes is B1103, which indicates a LHCM internal error with a turn signal fault. In this section, we’ll explore some advanced troubleshooting techniques that can help you diagnose and fix this issue.

Interpreting Voltage and Resistance Readings

One of the first things you should do when troubleshooting a B1103 error code is to check the battery voltage. A low battery voltage can cause BCM problems, so make sure the battery voltage is at least 12.5 volts. You should also check the fuses for the BCM and make sure they’re not blown. If the battery voltage and fuses are good, you can move on to checking the connections to the BCM. Make sure they’re clean and tight.

Resistance is another important factor to consider when troubleshooting a B1103 error code. Use a multimeter to check the resistance of the LHCM and RHCM circuits. If the resistance is too high or too low, it can cause the BCM to malfunction. Refer to your Harley Davidson manual for the specific resistance values for your particular model.

Dealing with Multiple Error Codes

Sometimes, you may encounter multiple error codes when troubleshooting a BCM problem. For example, you may see B1153, which is a RHCM internal error with a turn signal fault. If you’re dealing with multiple error codes, it’s important to prioritize them based on severity. Start with the codes that are most critical to the operation of your motorcycle and work your way down the list.

To troubleshoot multiple error codes, you can use a process of elimination. Start by addressing the most critical error code and work your way down. As you address each error code, recheck the other codes to see if they’ve been resolved. If you’re still having trouble after addressing all of the error codes, you may need to take your motorcycle to a Harley Davidson dealer for further diagnosis and repair.

By using these advanced troubleshooting techniques, you can diagnose and fix a B1103 error code on your Harley Davidson motorcycle. Remember to always refer to your Harley Davidson manual for specific instructions and values, and don’t hesitate to seek professional help if you’re unsure about any aspect of the troubleshooting process.

Maintenance and Prevention Strategies

Regular Inspection and Care

Regular inspection and care of your Harley-Davidson’s electrical components are essential to prevent issues such as code B1103. By regularly inspecting your bike’s electrical components, you can identify any potential issues before they become major problems.

One of the most important components to inspect is the battery. Ensure that the terminals are clean and free of corrosion. Regularly check the battery’s voltage and replace it if necessary. A weak battery can cause issues with the bike’s electrical system, including code B1103.

Another component to inspect is the ignition switch. Ensure that it is in good condition and functioning properly. A faulty ignition switch can cause issues with the bike’s electrical system, including code B1103.

Preventive Measures for Electrical Components

To prevent code B1103 and other electrical issues, there are several preventive measures that you can take.

One of the most important things you can do is to ensure that all electrical connections are tight and secure. Loose connections can cause issues with the bike’s electrical system, including code B1103.

Another preventive measure is to avoid overloading the bike’s electrical system. Be mindful of the number of accessories you add to your bike, as too many can cause issues with the electrical system.

Finally, ensure that all electrical components are properly grounded. A lack of proper grounding can cause issues with the bike’s electrical system, including code B1103.

By following these maintenance and prevention strategies, you can help prevent code B1103 and other electrical issues from occurring on your Harley-Davidson. Regular inspection and care, along with preventive measures, can help ensure that your bike’s electrical system remains in good condition and functioning properly.