If you’re a Harley-Davidson owner, you might have come across the term “Harley code B1351” when diagnosing issues with your motorcycle. This code refers to a specific problem that can occur with the rear right speaker on your Harley. If you’re experiencing issues with your audio system, it’s worth checking to see if this code is present.
The B1351 code indicates that the rear right speaker on your Harley is shorted low. This means that there is an issue with the speaker’s wiring or connection, which is causing it to malfunction. If you’re experiencing issues with the audio on your motorcycle, such as crackling or no sound at all, this code could be the culprit.
Fortunately, diagnosing and fixing this issue is relatively straightforward. You can read the DTC codes on a Harley-Davidson without a diagnostic tool by using the trip reset button. Once you’ve identified the B1351 code, you can begin troubleshooting the issue by checking the wiring and connections for the rear right speaker. If you’re not comfortable doing this yourself, you can always take your motorcycle to a qualified mechanic for assistance.
Understanding Harley Code B1351
If you’re experiencing issues with your Harley-Davidson’s radio or speaker system, you may come across the B1351 trouble code. This code indicates a short circuit in the rear right speaker, specifically a low short. Here’s what you need to know about understanding and diagnosing this code.
Diagnosis and Meaning
When your Harley-Davidson’s onboard computer detects a short circuit in the rear right speaker, it will trigger the B1351 trouble code. This code indicates that there’s a low short in the speaker, meaning that there’s an issue with the circuit that’s causing the speaker to receive too little voltage.
Common Causes and Solutions
There are several potential causes of the B1351 trouble code. Here are some of the most common:
- Speaker wiring issues: The wiring that connects the rear right speaker to the bike’s onboard computer may be damaged or frayed, causing a short circuit.
- Internal faults in the ignition switch: If there’s an issue with the ignition switch, it can cause a short circuit in the speaker system.
- BCM issues: The bike’s Body Control Module (BCM) is responsible for controlling many of the electrical systems, including the speaker system. If there’s an issue with the BCM, it can cause the B1351 trouble code to appear.
- Security or alarm system issues: If your Harley-Davidson has a security or alarm system installed, it could be causing a short circuit in the speaker system.
To diagnose the specific cause of the B1351 trouble code, you’ll need to perform a thorough inspection of the speaker system and its wiring. Check for any signs of damage or wear in the wiring, and test the ignition switch and BCM to ensure they’re functioning properly. If you’re not comfortable performing this type of diagnostic work yourself, it’s recommended that you take your bike to a qualified mechanic or dealership for assistance.
In conclusion, the B1351 trouble code is a common issue that can affect Harley-Davidson’s radio and speaker system. By understanding the potential causes of this code and performing a thorough diagnosis, you can get your bike back to peak performance in no time.
Electrical System Fundamentals
When it comes to the electrical system of your Harley-Davidson motorcycle, it’s important to have a basic understanding of its components and how they work together. In this section, we’ll cover battery and load basics as well as an overview of the ignition system.
Battery and Load Basics
The battery is the heart of your motorcycle’s electrical system. It provides the power necessary to start the engine and run the electrical components. The battery is a rechargeable storage device that stores electrical energy in the form of chemical energy. When the engine is running, the battery is charged by the alternator.
The load refers to all the electrical components that draw power from the battery. This includes the lights, horn, ignition system, and other accessories. The load is measured in amps and is a critical factor in determining the size of the battery needed for your motorcycle.
Ignition System Overview
The ignition system is responsible for starting the engine and keeping it running. It consists of several components, including the battery, starter, starter output, ignition switch, and spark plugs.
The starter is an electric motor that turns the engine over until it starts. The starter output is the amount of power the starter requires to turn the engine. The ignition switch is used to turn the ignition system on and off. The spark plugs ignite the fuel in the engine cylinders, which starts the combustion process.
If you encounter Harley code B1351, it indicates a problem with the ignition system. This code specifically refers to the ignition switch, which may be faulty or damaged. It’s important to address this issue promptly to avoid further damage to the electrical system.
Control Module Communication
If you are experiencing trouble with code B1351 on your Harley, it is likely related to the Body Control Module (BCM). The BCM is responsible for controlling a variety of functions on your motorcycle, including the security system, lighting, and instrument cluster. It communicates with other modules on the bike, such as the Instrument Module (IM), to ensure everything is working properly.
BCM Functionality
The BCM is essentially the “brain” of your Harley’s electrical system. It receives input from various sensors and switches, and uses that information to control the various functions on the bike. For example, if you turn on the ignition switch, the BCM will send a signal to the IM to turn on the instrument cluster. If you arm the security system, the BCM will send a signal to the IM to disable the starter.
IM Failures and Troubleshooting
If you are experiencing code B1351, it is possible that there is a problem with the communication between the BCM and the IM. This could be due to an internal fault in the IM, or a problem with the wiring or connectors between the two modules.
To diagnose the issue, you can use a diagnostic tool to read the trouble codes stored in the BCM and IM. If there is a communication error between the two modules, you may need to check the wiring and connectors to ensure they are clean and secure. If that does not solve the problem, you may need to replace the IM.
It is important to note that the security system on your Harley is also controlled by the BCM. If there is a problem with the BCM, it may cause issues with the security system as well. If you suspect that the BCM is the root cause of your problems, it is best to have it diagnosed by a professional technician.
By understanding the functionality of the BCM and the IM, you can troubleshoot issues related to code B1351 on your Harley. Keep in mind that the security system is also controlled by the BCM, so it is important to address any issues with the module as soon as possible.
Signal and Switch Issues
Harley Davidson motorcycles are equipped with various switches and signals to ensure proper functioning and safety while riding. However, sometimes these switches and signals can malfunction, causing issues that need to be addressed promptly. This section will cover some of the common problems associated with Harley code B1351 and the switches and signals it affects.
Turn Signal and Rear Hand Control Problems
If you’re experiencing issues with your left turn signal, horn, and headlight not working, it could be due to a faulty left-hand switch. In addition, the left turn signal may not cancel the right side signal, indicating a problem with the switch. This issue can be caused by a damaged or dirty switch, which can be easily fixed by cleaning or replacing the switch.
Another issue that riders may face is with the rear hand control. If the rear right speaker is shorted low, it could be due to a problem with the rear hand control. This issue can be resolved by checking the rear speaker diagnostics and fixing the problem with the control.
Clutch and Run/Stop Switch Concerns
The clutch and run/stop switches are also important components that can affect the functioning of your Harley. If you’re experiencing issues with the clutch switch, it could cause the engine to stall when shifting gears. This issue can be resolved by checking the clutch switch and replacing it if necessary.
The run/stop switch is another component that can cause issues if it’s not functioning properly. If you’re having trouble starting your motorcycle or if the engine is cutting out while riding, it could be due to a faulty run/stop switch. This issue can be resolved by checking the switch and replacing it if necessary.
In conclusion, Harley code B1351 can be caused by various issues related to switches and signals. If you’re experiencing any of the problems mentioned in this section, it’s important to address them promptly to ensure the safety and proper functioning of your motorcycle.
Harley-Davidson Diagnostic Trouble Codes
When your Harley-Davidson motorcycle encounters a problem, it can be frustrating and worrisome. Fortunately, Harley-Davidson has an onboard diagnostic system that can help you diagnose the problem. This system generates Diagnostic Trouble Codes (DTCs) that can help you identify the problem with your motorcycle. In this section, we will discuss how to interpret DTCs and specific codes and resolutions.
Interpreting DTCs
DTCs are generated by your Harley-Davidson’s onboard diagnostic system when it detects a problem. These codes are alphanumeric and can be accessed using a diagnostic connector, typically located under the seat or near the battery. Once you have accessed the DTCs, you can use a DTC chart to interpret them.
Specific Codes and Resolutions
One specific code that you may encounter is B1351. This code is related to the Body Control Module (BCM) and indicates that there is a problem with the ignition switch. This code can be resolved by checking the ignition switch wiring and connections. If the wiring and connections are fine, you may need to replace the ignition switch.
Other codes that you may encounter include:
- B1103: Faulty fuel sender
- B1153: Fuel level sensor circuit high
- B1200: Fuel sender open/shorted
- B1210: Tachometer circuit open/shorted
- B1211: Oil pressure switch open/shorted
- B1300: Turn signal output fault
If you encounter any of these codes, you should refer to a DTC chart to interpret them and identify the problem with your motorcycle. Once you have identified the problem, you can take the necessary steps to resolve it.
In conclusion, the onboard diagnostic system on your Harley-Davidson motorcycle can be a valuable tool in diagnosing problems. By understanding how to interpret DTCs and specific codes and resolutions, you can identify and resolve problems with your motorcycle.
Radio and Control Module Errors
If you are experiencing issues with your Harley’s radio or control module, you may encounter error codes such as B1351. This code indicates a problem with the rear right speaker being shorted low. Here are some common issues and solutions you can try to resolve this error:
Radio Voltage Issues
One common cause of radio errors is voltage issues. Make sure to check the battery voltage and ensure it is at least 12.5 volts. A low battery voltage can cause BCM problems, which can lead to various errors, including radio errors. Additionally, check the fuses for the BCM and make sure they are not blown. Finally, check the connections to the BCM and make sure they are clean and tight.
LHCM and RHCM Error Codes
B1351 is a specific error code that indicates a problem with the rear right speaker being shorted low. However, there are other error codes related to the LHCM (Left Hand Control Module) and RHCM (Right Hand Control Module). These modules are responsible for controlling various functions, including the radio. If you encounter error codes related to these modules, it is best to consult your Harley’s manual or take it to a qualified technician for diagnosis and repair.
In conclusion, radio and control module errors can be frustrating to deal with, but there are some steps you can take to resolve them. By checking the battery voltage, fuses, and connections, you can rule out some common issues. If you encounter specific error codes related to the LHCM or RHCM, it is best to seek professional help.
Fuel System Diagnostics
If you are experiencing code B1351 on your Harley-Davidson motorcycle, it is likely that you are dealing with a fault condition related to the rear right speaker being shorted low. However, it is also possible that you are dealing with a fuel system issue. In this section, we will discuss some common fuel system diagnostics that you can perform to help identify the issue.
Fuel Level Sender Errors
One possible cause of code B1351 is a fuel level sender that is shorted low or open. This can cause the fuel signal to be irregular, which can trigger the code. To diagnose this issue, you will need to check the fuel level sender for any signs of damage or wear. You can do this by visually inspecting the sender and checking for any visible signs of damage.
If you do not see any damage, you can also test the sender using a multimeter. This will allow you to check the resistance of the sender and determine if it is functioning properly. If the sender is damaged or not functioning properly, it will need to be replaced.
Fuel Signal Irregularities
Another possible cause of code B1351 is fuel signal irregularities. This can occur when the fuel signal is too low or too high, which can trigger the code. To diagnose this issue, you will need to check the fuel pump output for any signs of damage or wear.
You can do this by visually inspecting the fuel pump output and checking for any visible signs of damage. If you do not see any damage, you can also test the fuel pump output using a multimeter. This will allow you to check the voltage of the output and determine if it is functioning properly.
If the fuel pump output is damaged or not functioning properly, it will need to be replaced. It is important to note that fuel system issues can be complex, and it may be necessary to consult a professional mechanic to properly diagnose and repair the issue.
By performing these fuel system diagnostics, you can help identify the cause of code B1351 and take the necessary steps to repair the issue.
Advanced Troubleshooting Techniques
If you’ve already tried the basic troubleshooting techniques for Harley code B1351 and are still having issues, there are a few advanced techniques you can try.
Beyond the Basics
One of the first things to check is the ECT (Engine Coolant Temperature) sensor. This sensor is responsible for monitoring the temperature of the engine coolant and sending that information to the BCM. If the ECT sensor is malfunctioning, it can cause the BCM to throw a B1351 code. Check the sensor’s wiring and connections, and replace the sensor if necessary.
Another component to check is the BAS (Bank Angle Sensor). This sensor is responsible for detecting when the bike has fallen over or been in an accident and shutting off the engine to prevent further damage. If the BAS is malfunctioning, it can cause the BCM to throw a B1351 code. Check the sensor’s wiring and connections, and replace the sensor if necessary.
Professional Diagnostic Approach
If you’ve tried all of the basic and advanced techniques and are still having issues, it may be time to take your bike to a professional mechanic for a diagnostic check. They will have access to specialized diagnostic equipment and software that can pinpoint the exact cause of the B1351 code.
When you take your bike in for a diagnostic check, be sure to tell the mechanic about any recent modifications or repairs you’ve made to the bike, as these can affect the diagnostic process. They may also ask you to operate the bike in certain ways or under certain conditions to help diagnose the issue.
Overall, if you’re having issues with Harley code B1351, don’t panic. With a little patience and some basic troubleshooting techniques, you can often diagnose and fix the issue on your own. And if you can’t, there are always professionals available to help.