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Harley Code B1402: What It Means and How to Fix It

by

Chase Manhattan

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Owner and Editor at The Wrench Network

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Hey y’all, it’s Chase Manhattan! I’m a life-long automotive and motorcycle enthusiast with a knack for diagnostics that I hope to share with you! Lately, I’ve been running my own motorcycle rental business, which you can read about here, and it has been a great experience that has allowed me to own numerous bikes that I probably couldn’t justify otherwise. Plus, it’s been a great way to experience new places while on vacation. If you haven’t heard of them before, I definitely recommend checking out the Riders-Share platform if you get the itch to ride while away from home, or if you want to explore a cheaper way to own and ride motorcycles!

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If you own a Harley-Davidson motorcycle, you may have encountered a B1402 code. This code refers to an “amp voltage high” error, which can cause issues with your audio system. Understanding what this code means and how to address it can help you keep your Harley running smoothly.

When you see the B1402 code, it means that the voltage going to your amplifier is too high. This can cause your audio system to malfunction or even fail completely. There are a few potential causes of this issue, including a faulty amplifier, wiring problems, or a malfunctioning battery. It’s important to diagnose the root cause of the problem in order to fix it effectively.

If you’re experiencing the B1402 code on your Harley, there are a few steps you can take to address the issue. First, you may want to try resetting your trip button to see if the code clears. If that doesn’t work, you may need to check your wiring and connections to ensure that everything is properly connected. If you’re still having issues, you may need to take your bike to a professional mechanic for further diagnosis and repair.

Understanding Harley Code B1402

Significance of Diagnostic Trouble Codes

Diagnostic Trouble Codes (DTCs) are used by Harley-Davidson motorcycles to identify and communicate issues with the various systems and components. These codes are generated by the motorcycle’s onboard computer and can provide valuable information to the rider or mechanic about the nature of the problem.

Specifics of B1402 Code

If you are experiencing issues with the driver power window down switch circuit on your Harley-Davidson motorcycle, you may receive the B1402 DTC. This code indicates a failure in the driver power window down switch circuit, which can cause the window motor to stall or stop working altogether.

The B1402 code is typically caused by a malfunction in the window track, regulator, or glass weatherstrips. These components can cause the glass to bind, which can be interpreted by the motorcycle’s computer as a motor stalled condition. This can result in the motor being halted or stopped altogether, preventing the window from functioning properly.

If you receive the B1402 code on your Harley-Davidson motorcycle, it is recommended that you take your bike to a qualified mechanic for diagnosis and repair. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

In conclusion, understanding Harley Code B1402 is important for any Harley-Davidson motorcycle owner. If you experience issues with your driver power window down switch circuit, it is recommended that you take your bike to a qualified mechanic for diagnosis and repair.

Electrical Components Related to B1402

When troubleshooting Harley code B1402, it’s important to consider the electrical components that are related to this issue. Here are two key components that you should focus on:

Battery and Ignition System

The battery and ignition system are critical components of your Harley’s electrical system. If either of these systems is malfunctioning, it can cause a variety of issues, including code B1402. Make sure to check the battery and ignition system for any signs of damage or wear, and replace any components that are not functioning properly.

Body Control Module (BCM)

The Body Control Module (BCM) is another component that can be related to code B1402. The BCM is responsible for controlling many of the electrical systems in your Harley, including the power windows. If the BCM is malfunctioning, it can cause issues with the power windows and other electrical systems. Make sure to check the BCM for any signs of damage or wear, and replace it if necessary.

In addition to these components, you should also check the wiring harnesses and connectors for any signs of damage or wear. A poor electrical connection can also cause code B1402, so make sure to inspect all connections thoroughly. If you’re not comfortable troubleshooting these issues on your own, it’s always best to take your Harley to a qualified mechanic who can help you diagnose and repair the problem.

Troubleshooting the B1402 Error

If you are experiencing the B1402 error code on your Harley-Davidson, it’s important to troubleshoot the issue as soon as possible to avoid further damage to your vehicle. In this section, we’ll go over some initial diagnostic steps and advanced troubleshooting techniques to help you resolve the issue.

Initial Diagnostic Steps

The first step in troubleshooting the B1402 error code is to check the driver power window down switch circuit for any signs of damage or wear. This can be done by inspecting the wiring and connections for any visible signs of corrosion, fraying, or other damage. If you notice any issues, you may need to replace the damaged components.

Another initial diagnostic step is to check the amp voltage levels on your Harley-Davidson. If the voltage is too high or too low, it can cause the B1402 error code to appear. You can check the voltage levels using a diagnostic tool or by using the trip reset button on your Harley-Davidson.

Advanced Troubleshooting Techniques

If the initial diagnostic steps do not resolve the issue, you may need to use more advanced troubleshooting techniques. One technique is to use a diagnostic tool to scan your Harley-Davidson for any other error codes that may be related to the B1402 code. This can help you identify any underlying issues that may be causing the problem.

Another advanced troubleshooting technique is to check the power window motor and regulator for any signs of damage or wear. If the motor or regulator is faulty, it can cause the B1402 error code to appear. You may need to replace the damaged components to resolve the issue.

In conclusion, troubleshooting the B1402 error code on your Harley-Davidson requires careful inspection and diagnosis. By following the initial diagnostic steps and using advanced troubleshooting techniques, you can identify and resolve the underlying issue causing the error code to appear.

Harley-Davidson Electrical Systems

When it comes to Harley-Davidson motorcycles, the electrical system is a critical component that keeps everything running smoothly. Understanding how the electrical system works can help you diagnose and fix problems quickly and efficiently.

Understanding the CAN Network

Harley-Davidson motorcycles use a Controller Area Network (CAN) to communicate between various electronic control units (ECUs) and other components on the bike. The CAN network is a two-wire system that allows for high-speed communication between different parts of the motorcycle.

Role of the ECU and LHCM

The Engine Control Unit (ECU) is responsible for controlling the engine and monitoring various sensors and systems on the bike. The Lighting Control Module (LHCM) controls the lighting system and is responsible for monitoring various sensors and switches related to the lights.

When it comes to diagnosing problems with the electrical system, the ECU and LHCM are two of the most important components to check. If you see a fault code like B1402, it could indicate a problem with the LHCM or another component on the CAN network.

In summary, understanding the basics of the electrical system on your Harley-Davidson motorcycle can help you diagnose and fix problems quickly and efficiently. Keep in mind the role of the ECU and LHCM, and be sure to check for fault codes like B1402 if you’re experiencing issues with the lighting system.

Common Issues and Solutions

If you are experiencing the B1402 code on your Harley, it is likely that you are having issues with the driver power window down switch circuit. This problem can be caused by a number of factors, including LHCM and RHCM internal errors, as well as ignition and fuel system faults.

LHCM and RHCM Internal Errors

The LHCM and RHCM are the left and right hand control modules on your Harley, respectively. These modules are responsible for controlling various functions on your bike, including the power windows. If there is an internal error in either of these modules, it can cause the B1402 code to appear.

To diagnose this issue, you will need to use a diagnostic tool to read the codes stored in the LHCM and RHCM. Once you have identified the source of the problem, you can take steps to fix it. This may involve replacing the faulty module, or repairing any damaged wiring or connections.

Ignition and Fuel System Faults

Another common cause of the B1402 code is ignition and fuel system faults. If there is a problem with the ignition switch or fuel system on your Harley, it can cause the power window down switch circuit to fail, resulting in the B1402 code.

To diagnose this issue, you will need to check the ignition switch and fuel system components for any signs of damage or wear. You may also need to perform tests on the fuel system to ensure that it is functioning properly. If you identify any faults or issues, you will need to take steps to repair or replace the affected components.

In conclusion, the B1402 code on your Harley can be caused by a number of factors, including LHCM and RHCM internal errors, as well as ignition and fuel system faults. By using a diagnostic tool to identify the source of the problem, you can take steps to fix it and get your bike back on the road.

Maintenance Tips to Prevent Error Codes

Harley-Davidson motorcycles are known for their power and performance, but like any other vehicle, they require regular maintenance to keep running smoothly. In this section, we’ll discuss some maintenance tips to prevent error codes like B1402 from occurring.

Regular Checks and Balances

Regular checks and balances are essential to keep your Harley-Davidson motorcycle in top condition. Here are some tips to help you maintain your bike:

  • Check the oil level regularly and change it as recommended by the manufacturer.
  • Keep the battery charged and the terminals clean.
  • Check the tire pressure and tread depth regularly.
  • Inspect the brakes and replace worn pads or shoes.
  • Check the clutch and throttle cables for wear and adjust as needed.
  • Inspect the air filter and replace it if it’s dirty.
  • Check the spark plugs and replace them if they’re worn or fouled.

By following these tips, you can prevent many common issues that can lead to error codes like B1402.

When to Seek Professional Help

While regular maintenance can prevent many problems, there may be times when you need to seek professional help. Here are some signs that it’s time to take your Harley-Davidson to a mechanic:

  • You notice unusual noises or vibrations.
  • The bike is difficult to start or has poor acceleration.
  • The brakes feel spongy or the bike pulls to one side.
  • The clutch slips or the gears grind.
  • You see warning lights or error codes on the dashboard.

If you experience any of these issues, it’s best to take your bike to a qualified mechanic who can diagnose and repair the problem. Trying to fix complex issues yourself can lead to further damage and expensive repairs.

By following these maintenance tips and knowing when to seek professional help, you can keep your Harley-Davidson running smoothly and avoid error codes like B1402.

Understanding Harley Sensors and Inputs

Harley-Davidson motorcycles come equipped with various sensors and inputs that help the bike’s onboard computer system monitor and adjust its performance. Understanding these sensors and inputs is crucial to diagnosing and resolving any issues your Harley may be experiencing. In this section, we’ll take a closer look at some of the most important sensors and inputs on your Harley, including the IAT, ISS, VSS, and fuel level sender.

Importance of IAT and ISS

The Intake Air Temperature (IAT) sensor and the Idle Speed Control (ISS) motor are two of the most important sensors on your Harley. The IAT sensor measures the temperature of the incoming air, while the ISS motor controls the idle speed of the engine. These two sensors work together to ensure that your Harley is running smoothly and efficiently.

If the IAT sensor is malfunctioning, your Harley may experience issues with starting, idling, or acceleration. Similarly, if the ISS motor is not functioning properly, your Harley may experience issues with idling or stalling. It’s important to keep these sensors clean and free of debris to ensure that they’re working properly.

Decoding VSS and Fuel Level Readings

The Vehicle Speed Sensor (VSS) and fuel level sender are two other important sensors on your Harley. The VSS measures the speed of the motorcycle and sends this information to the onboard computer system. The fuel level sender, as the name suggests, measures the amount of fuel in the tank and sends this information to the onboard computer system.

If the VSS is not working properly, your Harley may experience issues with speedometer accuracy, cruise control, or transmission shifting. Similarly, if the fuel level sender is malfunctioning, your Harley may experience issues with fuel gauge accuracy or running out of gas unexpectedly. It’s important to keep these sensors clean and well-maintained to ensure that they’re working properly.

In conclusion, understanding the various sensors and inputs on your Harley is crucial to maintaining its performance and diagnosing any issues it may be experiencing. By keeping these sensors clean and well-maintained, you can ensure that your Harley is running smoothly and efficiently.

Error Code Resolution and Clearing

If you encounter the B1402 error code on your Harley-Davidson, you need to resolve it as soon as possible. Here are some steps you can take to clear the error code:

Clearing Codes Post-Repair

Once you have repaired the issue that caused the B1402 error code, you can clear the code by following these steps:

  1. Turn on the ignition switch and wait for the speedometer to light up.
  2. Press the odometer reset button until the “PSSPt” message appears.
  3. Release the odometer reset button and then press and hold it again.
  4. The code “d01” will appear. Press the odometer reset button again to cycle through the codes until you reach “d01 CLr.”
  5. Release the odometer reset button and the code will be cleared.

Ensuring Error Code Does Not Recur

To prevent the B1402 error code from recurring, you should take the following steps:

  1. Check the wiring and connections to ensure they are secure and free of damage.
  2. Check the voltage output of the battery and charging system to ensure they are within the manufacturer’s specifications.
  3. Check the driver power window down switch and replace it if necessary.
  4. Test the window motor and regulator to ensure they are functioning properly.
  5. Test the door module to ensure it is functioning properly.

By following these steps, you can clear the B1402 error code and prevent it from recurring. If you are unsure about any of these steps, consult with a professional mechanic or Harley-Davidson dealer to ensure you are performing the necessary repairs correctly.

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