Harley Code B1404: Understanding the Diagnostic Trouble Code

If you own a Harley-Davidson motorcycle, you may have encountered a B1404 fault code at some point. This code indicates an internal thermal shutdown error, which can be caused by a variety of factors. It’s important to understand what this code means and how to diagnose and fix the issue to keep your motorcycle running smoothly.

When you see the B1404 code on your Harley, it means that there is a problem with the amplifier circuit. This can be caused by a malfunctioning amplifier, a blown fuse, or a wiring issue. If left unchecked, this issue can cause further damage to your motorcycle’s electrical system, so it’s important to address it as soon as possible. There are several steps you can take to diagnose and fix this issue, including checking the amplifier and wiring, replacing the fuse, and resetting the system.

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Understanding Harley Code B1404

If you own a Harley-Davidson motorcycle, you may have encountered the B1404 trouble code. This code indicates an issue with the driver side airbag deployment control circuit. In this section, we’ll explain what this code means and what you can do to fix it.

The B1404 trouble code is usually caused by a problem with the ignition switch or the battery. If the battery is weak or not providing enough power, it can cause the airbag deployment control circuit to malfunction. Similarly, if the ignition switch is faulty, it can also cause this code to appear.

To diagnose the B1404 trouble code, you’ll need to use a diagnostic tool or take your motorcycle to a qualified mechanic. They will be able to read the code and determine the underlying issue. Once the issue has been identified, they can then take steps to fix it.

If the problem is with the battery, you may need to replace it. Similarly, if the ignition switch is faulty, it may need to be replaced as well. In some cases, the wiring or connectors may need to be repaired or replaced.

In summary, the B1404 trouble code indicates an issue with the driver side airbag deployment control circuit. If you encounter this code, it’s important to have it diagnosed and repaired as soon as possible to ensure your safety while riding your Harley-Davidson motorcycle.

Diagnostic Trouble Codes (DTC)

If you own a Harley-Davidson motorcycle, you may have come across the term “Diagnostic Trouble Codes” or “DTCs” before. These codes are generated by the motorcycle’s onboard diagnostic system (OBD) when it detects one or more malfunction sensors, circuits, or components.

Interpreting DTCs

Interpreting DTCs can be tricky, but it is an essential part of diagnosing and repairing issues with your Harley-Davidson motorcycle. Each DTC is a unique identifier used by onboard diagnostic systems to pinpoint specific issues within a vehicle. The codes are alphanumeric and consist of a letter followed by four numbers. For example, the code B1404 indicates an internal thermal shutdown error.

To interpret a DTC, you will need to consult your Harley-Davidson’s service manual. The manual will provide a list of codes and their corresponding descriptions. Once you have identified the code, you can use it to diagnose and repair the issue.

Common Harley DTCs

Here are some common DTCs that Harley-Davidson owners may encounter:

B1404: Internal Thermal Shutdown Error
B1101: LHCM Turn Signal Bulb Out

B1103: LHCM Internal Error
P0374: CKP Sensor Synch Error
P0463: Fuel Level Sender High

P0562: Battery Voltage Low
P0118: Engine Coolant Temperature (ECT) Sensor High
P0131: Front Oxygen Sensor Low

P0151: Rear Oxygen Sensor Low
P0501: Vehicle Speed Sensor (VSS) Range/Performance

If you encounter any of these DTCs, consult your Harley-Davidson’s service manual for more information on how to diagnose and repair the issue.

Remember, interpreting DTCs is just one part of diagnosing and repairing issues with your Harley-Davidson motorcycle. If you are unsure about how to proceed, it is always best to consult a qualified mechanic or Harley-Davidson dealer.

Electrical System Fundamentals

Battery Basics

The battery is the heart of the electrical system of your Harley. It provides the necessary power to start the engine and keeps all the electrical components running while the engine is running. A battery is made up of cells that contain a positive and negative plate, an electrolyte solution, and a separator. The voltage of a battery is determined by the number of cells it has. The most common types of batteries used in Harley-Davidson motorcycles are lead-acid batteries.

Ignition System Overview

The ignition system is responsible for providing the spark that ignites the fuel in the engine. It consists of the ignition switch, starter output, and the spark plugs. The ignition switch is responsible for turning the ignition on and off. The starter output is the signal that is sent to the starter motor to turn the engine over. The spark plugs are responsible for igniting the fuel in the engine.

When troubleshooting a code B1404 on your Harley-Davidson motorcycle, it is important to have a basic understanding of the electrical system fundamentals. This includes knowing the battery basics and the ignition system overview. By understanding these fundamentals, you can better diagnose and fix any issues that may arise with your motorcycle’s electrical system.

Body Control Module (BCM)

The Body Control Module (BCM) is a crucial component of your Harley Davidson motorcycle that controls various electrical systems such as lighting, turn signals, and ignition. The BCM is responsible for monitoring and controlling various sensors and modules in your motorcycle’s electrical system.

BCM Functions

The BCM is responsible for performing various functions in your motorcycle’s electrical system. Some of the functions include:

Monitoring and controlling lighting systems such as headlights, taillights, and turn signals
Monitoring and controlling the ignition system

Monitoring and controlling the security system
Monitoring and controlling various sensors such as the security antenna and other sensors

BCM Error Codes

When the BCM encounters an error, it will display an error code on your motorcycle’s dashboard. One of the error codes that you may encounter is B1404.

The B1404 error code indicates that there is a problem with the security antenna on your motorcycle. This error code can be caused by a faulty security antenna or a problem with the BCM itself.

Other error codes that you may encounter with the BCM include:

B1153: Ignition switch output shorted to battery

B1200: Fuel sender open/high
B1210: Tachometer circuit open/high
B1211: Tachometer circuit shorted low

B1212: Tachometer circuit shorted high
B1213: Tachometer output open

If you encounter any of these error codes, it is recommended that you take your motorcycle to a qualified mechanic for diagnosis and repair.

In conclusion, the BCM is an essential component of your Harley Davidson motorcycle’s electrical system. It performs various functions and is responsible for monitoring and controlling various sensors and modules. If you encounter any error codes related to the BCM, it is recommended that you seek professional assistance to diagnose and repair the problem.

Handlebar Switch Assemblies

If you are experiencing Harley code B1404, it could be an indication of an issue with the handlebar switch assemblies. These assemblies are responsible for controlling various functions on your motorcycle, such as the turn signals, headlights, and horn. In this section, we will discuss the left hand control module (LHCM) and the right hand control module (RHCM) in more detail.

Left Hand Control Module (LHCM)

The LHCM is located on the left handlebar and is responsible for controlling the turn signals, horn, and rear hand controls. If you are experiencing an LHCM internal error, it could be an indication of a problem with the LHCM itself. In some cases, this error can be resolved by replacing the LHCM.

Right Hand Control Module (RHCM)

The RHCM is located on the right handlebar and is responsible for controlling the headlights, run/stop switch, and rear PTT button. If you are experiencing an RHCM internal error, it could be an indication of a problem with the RHCM itself. In some cases, this error can be resolved by replacing the RHCM.

It is important to note that the rear hand controls are also controlled by the LHCM. If you are experiencing issues with the rear hand controls, it is possible that there is an issue with the LHCM. However, it is always a good idea to check all of the wiring and connections before replacing any parts.

In summary, if you are experiencing Harley code B1404, it is important to check the handlebar switch assemblies. The LHCM and RHCM are responsible for controlling various functions on your motorcycle, and an internal error with either module can cause issues with these functions. By checking the LHCM and RHCM and replacing any faulty parts, you can resolve issues with Harley code B1404 and get back on the road.

Radio and Audio Errors

If you are experiencing issues with your Harley-Davidson’s radio or audio system, it can be frustrating. However, with the help of Harley’s fault code chart, you can quickly identify the issue and get it fixed. In this section, we will discuss some common radio faults and audio control issues that you may encounter.

Common Radio Faults

One of the most common radio faults is B1404, which indicates an internal thermal shutdown error. This error can occur when the amplifier overheats, causing the radio to shut down. If you encounter this error, you should turn off the radio and let it cool down before attempting to use it again.

Another common radio fault is B1301, which indicates a radio voltage high error. This error can occur when the radio’s voltage is too high, causing damage to the system. If you encounter this error, you should check the voltage of your battery and alternator to ensure that they are functioning correctly.

Audio Control Issues

If you are experiencing issues with your audio controls, there are a few things that you can check. One common issue is a stuck button, which can occur with any of the following buttons: rear volume up, rear volume down, rear mode, rear tune up, rear tune down, faceplate preset button 1, faceplate preset button 2, faceplate preset button 3, faceplate preset button 4, and faceplate preset button 5.

To fix a stuck button, you can try cleaning the button or using a small tool to gently pry it back into place. If this does not work, you may need to replace the button or the entire audio control system.

Overall, if you are experiencing any issues with your Harley-Davidson’s radio or audio system, it is important to consult the fault code chart to identify the issue and get it fixed as soon as possible. This will ensure that you can continue to enjoy your ride without any interruptions.

Fuel System Diagnostics

When it comes to Harley-Davidson motorcycles, the fuel system is an essential component. If you are experiencing issues with your fuel system, it is important to diagnose the problem as soon as possible. One of the error codes that you may encounter is B1404. This code is related to the fuel level sender circuit.

Fuel Level Sender Issues

The fuel level sender is responsible for sending a signal to the fuel gauge on your motorcycle. If there is an issue with the fuel level sender, it can cause the fuel gauge to display incorrect information. The following are some of the issues that can occur with the fuel level sender:

Fuel level sender shorted low/open

Fuel level sender shorted high
Fuel signal low
Fuel signal high

If you are experiencing any of these issues, it is important to diagnose the problem as soon as possible. The first step is to check the wiring and connections to the fuel level sender. Make sure that all connections are clean and tight. If the wiring and connections are good, you may need to replace the fuel level sender.

In addition to the fuel level sender, there are other components in the fuel system that can cause issues. These include the fuel pump, fuel filter, and fuel injectors. If you are experiencing issues with your fuel system, it is important to have it diagnosed by a professional.

Overall, the fuel system is an essential component of your Harley-Davidson motorcycle. If you are experiencing issues with your fuel system, it is important to diagnose the problem as soon as possible to avoid further damage.