If you own a Harley Davidson motorcycle, you may have experienced issues with the check engine light illuminating. One of the codes you may encounter is B1356. This code is related to the radio, instrument, and body control module. It specifically indicates that the SDARS antenna is open.

When this code appears, it is important to address the issue promptly. Ignoring it could lead to further problems with your motorcycle’s performance. The symptoms of this code may include a malfunctioning radio, instrument panel, or other electrical components. Fortunately, there are steps you can take to diagnose and fix the problem.

Understanding Diagnostic Codes

If you own a Harley-Davidson motorcycle, you know how important it is to keep an eye on the diagnostic codes. These codes are designed to alert you to potential issues within the various systems of your bike, such as the engine, transmission, ABS, radio, instruments, and BCM. In this section, you will learn more about diagnostic codes in general and how to interpret them.

Code B1356 Explained

Code B1356 is a diagnostic trouble code (DTC) that is generated by the onboard computer system of your Harley-Davidson motorcycle. This code indicates a fault in the ignition coil control circuit. The most common symptoms of this code include a misfire, rough idle, and poor performance. To diagnose this code, you will need a diagnostic tool that can read the codes and a service manual that can guide you through the troubleshooting process.

Common Harley Diagnostic Codes

Harley-Davidson motorcycles use a variety of diagnostic trouble codes to help you identify potential issues with your bike. Here are some of the most common codes you might encounter:

• P Codes: These codes are generated by the engine control module (ECM) and indicate an issue with the engine or emissions system. Examples include P1356, which indicates a fault in the ignition coil control circuit, and P1510, which indicates a fault in the throttle actuator control (TAC) system.

• C Codes: These codes are generated by the anti-lock brake system (ABS) and indicate an issue with the ABS system. Examples include C1095, which indicates a fault in the ABS hydraulic pump motor circuit, and C1233, which indicates a fault in the ABS wheel speed sensor circuit.

• B Codes: These codes are generated by the radio, instruments, or BCM and indicate an issue with these systems. Examples include B2141, which indicates a fault in the ignition switch output circuit, B2156, which indicates a fault in the turn signal module (TSM) output circuit, and B2146, which indicates a fault in the front fuel gauge output circuit.

By understanding these codes and what they mean, you can diagnose potential issues with your Harley-Davidson motorcycle and keep it running smoothly. If you are unsure about how to diagnose a particular code, consult your service manual or take your bike to a qualified mechanic for assistance.

Ignition System Overview

The ignition system is a crucial part of your Harley Davidson motorcycle. It is responsible for starting and running the engine. The ignition system consists of several components, including the ignition coil and ignition switch. In this section, we will provide an overview of how these components work together to start and run your motorcycle.

Ignition Coil Function

The ignition coil is responsible for converting the battery’s low voltage into high voltage, which is necessary to create a spark in the spark plug. The coil consists of two coils of wire wrapped around an iron core. When the current flows through the primary coil, it creates a magnetic field. When the current is interrupted, the magnetic field collapses, inducing a high voltage in the secondary coil.

Ignition Switch Operation

The ignition switch is the component that allows you to turn the motorcycle on and off. It is usually located on the handlebars, and when you turn the key, it sends a signal to the starter relay to start the engine. The ignition switch also provides power to the ignition system, including the ignition coil.

When the key is turned to the “on” position, the ignition switch sends power to the ignition coil, which then sends high voltage to the spark plugs. This creates a spark, which ignites the fuel in the engine, starting the motorcycle. When the key is turned to the “off” position, the ignition switch cuts power to the ignition system, stopping the engine.

In summary, the ignition system is a vital component of your motorcycle, consisting of several parts, including the ignition coil and ignition switch. The ignition coil converts the battery’s low voltage into high voltage, creating a spark in the spark plug. The ignition switch allows you to turn the motorcycle on and off, providing power to the ignition system when the key is turned to the “on” position.

Electrical Load Management

When it comes to Harley Code B1356, electrical load management is an important factor to consider. This code indicates that there is an issue with the SDARS (Satellite Digital Audio Radio Service) antenna open circuit. The SDARS antenna is responsible for receiving satellite radio signals and transmitting them to the radio head unit. A fault in this circuit can cause a range of problems, including issues with the engine’s performance.

ECM and Load Control

The Engine Control Module (ECM) is responsible for managing the electrical load on your Harley. It controls the voltage regulator and ensures that the battery is charged and the electrical system is running smoothly. The ECM also monitors the SDARS antenna circuit and will trigger the B1356 code if it detects an open circuit.

If you have a B1356 code, it is important to check the wiring and connections between the SDARS antenna and the ECM. Any damage or loose connections can cause an open circuit and trigger the code. If the wiring and connections are intact, the issue may be with the antenna itself.

Power Commander Role

The Power Commander is an aftermarket device that can be installed on your Harley to adjust the fuel injection and ignition timing. It can also be used to adjust the electrical load on your bike. However, if the Power Commander is not installed correctly, it can cause problems with the ECM and trigger the B1356 code.

If you have a Power Commander installed and are experiencing issues with the B1356 code, it is important to check the installation and wiring. Any loose connections or incorrect wiring can cause problems with the ECM and trigger the code.

In summary, the B1356 code can be caused by a range of issues related to the electrical load on your Harley. It is important to check the wiring and connections between the SDARS antenna and the ECM, as well as the installation and wiring of any aftermarket devices such as the Power Commander.

Sensor and Wiring Issues

If you’re experiencing Harley code P1356, it could be due to sensor and wiring issues. Here are some common issues and troubleshooting steps you can take to resolve them.

Troubleshooting Wiring Problems

One of the most common causes of Harley code P1356 is damaged wiring on the injectors near the plug. This can cause a misfire in the rear cylinder, leading to the P1356 code. To troubleshoot this issue, you should inspect the wiring on the injectors and look for any signs of damage, such as frayed wires or broken connectors. If you find any damage, you should replace the wiring as soon as possible.

Another possible cause of wiring issues is a bad connection between the injector and the fuel injector harness. This can cause a misfire in the rear cylinder and trigger the P1356 code. To troubleshoot this issue, you should inspect the connection between the injector and the fuel injector harness and make sure it is secure. If the connection is loose, you should tighten it or replace the harness if necessary.

Sensor Malfunctions

Another possible cause of Harley code P1356 is a malfunctioning sensor. The most common sensor that can cause this issue is the crankshaft position sensor. This sensor is responsible for detecting the position of the crankshaft and sending this information to the engine control module (ECM).

If the crankshaft position sensor is malfunctioning, it can cause a misfire in the rear cylinder and trigger the P1356 code. To troubleshoot this issue, you should inspect the sensor and make sure it is functioning properly. You can use a multimeter to test the sensor’s resistance and compare it to the manufacturer’s specifications.

In addition to the crankshaft position sensor, the camshaft position sensor can also cause issues with the P1356 code. This sensor is responsible for detecting the position of the camshaft and sending this information to the ECM. If the camshaft position sensor is malfunctioning, it can cause a misfire in the rear cylinder and trigger the P1356 code.

In conclusion, if you’re experiencing Harley code P1356, it could be due to sensor and wiring issues. By following the troubleshooting steps outlined above, you can identify and resolve these issues and get your Harley back on the road.

Body Control Module (BCM) Functions

The Body Control Module (BCM) is a crucial component of your Harley Davidson motorcycle that is responsible for controlling various functions of the motorcycle’s body, such as lighting, horn, and turn signals. The BCM communicates with other modules to ensure that all systems are working correctly. Understanding the functions of the BCM can help you troubleshoot issues that may arise.

BCM and Code B1356

Code B1356 is a common BCM-related issue that Harley Davidson riders may encounter. This code indicates a failure in the BCM’s output to the turn signal module. If you are experiencing this issue, it could be due to a variety of factors, including a faulty BCM, a damaged wiring harness, or a malfunctioning turn signal module.

To diagnose this issue, you can use the onboard diagnostics to confirm diagnostic trouble codes (DTCs) stored under the BCM. These DTCs will assist in troubleshooting to resolve lighting issues on can bus models. You can also check the battery voltage, fuses, and connections to the BCM to ensure that they are clean and tight.

Other BCM Related Codes

In addition to B1356, there are other BCM-related codes that you may encounter, including B1300, B1301, B1302, B1303, and B1304. These codes indicate issues with the BCM’s communication with other modules, such as the speedometer or the security module.

If you encounter any of these codes, it is important to diagnose the issue promptly to prevent further damage to your motorcycle. You can use the onboard diagnostics to confirm diagnostic trouble codes (DTCs) stored under the BCM. These DTCs will assist in troubleshooting to resolve the issue.

In summary, the BCM is an essential component of your Harley Davidson motorcycle that controls various functions of the motorcycle’s body. If you encounter any issues related to the BCM, it is important to diagnose the issue promptly using the onboard diagnostics and checking the battery voltage, fuses, and connections to the BCM.

Combustion and Cylinder Performance

Rear Cylinder Combustion

Harley code B1356 is a rear cylinder misfire code, which means that the rear cylinder is not performing as it should. This can lead to a noticeable loss of power, uneven or rough engine running, and potentially an engine misfire. The motorcycle might also exhibit poor acceleration and increased fuel consumption. Additionally, the check engine light will usually illuminate when this code is present.

To diagnose the issue, you should start by checking the rear spark plug and wire. If those are good, check the coil. If the issue persists, it may be necessary to take the motorcycle to a dealer for further diagnosis.

Cylinder Specific Codes

Harley codes B1103 and B1153 are cylinder-specific codes that may also indicate an issue with combustion and cylinder performance. B1103 indicates a front cylinder spark plug circuit fault, while B1153 indicates a rear cylinder spark plug circuit fault.

If you receive either of these codes, it is important to check the corresponding spark plug and wire for any issues. If those are good, check the coil. If the issue persists, it may be necessary to take the motorcycle to a dealer for further diagnosis.

Remember, proper combustion and cylinder performance are essential for the smooth operation of your Harley motorcycle. If you experience any issues with these systems, it is important to address them promptly to avoid further damage and ensure the longevity of your motorcycle.

Turn Signal and Lighting Malfunctions

If you’re experiencing issues with your Harley’s turn signals or lighting system, it can be frustrating and dangerous. However, with a little bit of troubleshooting, you can often diagnose and fix the problem yourself.

Diagnosing Turn Signal Issues

If your turn signals aren’t working properly, start by checking the bulbs. If a bulb is burned out, it will need to be replaced. If the bulbs are okay, check the wiring to make sure there are no breaks or loose connections. You can also check the turn signal switch to see if it’s functioning properly.

Sometimes, turn signal issues can be caused by a faulty Body Control Module (BCM). If you’re experiencing issues with your turn signals and you’ve ruled out the bulbs, wiring, and switch, it may be time to check the BCM. This is where error codes such as B1330, B1331, and B1332 may come into play. These codes can help you diagnose the issue and determine if the BCM needs to be replaced.

Lighting System Error Codes

In addition to turn signal issues, there are a variety of error codes that can indicate problems with your Harley’s lighting system. One common code is B1356, which indicates an open circuit in the SDARS antenna. Another common code is B2159, which indicates an overload in the right rear turn signal output.

If you’re seeing error codes related to your lighting system, start by checking the wiring and connections. Look for any breaks or loose connections that may be causing the issue. If you’re unable to find the problem, it may be time to take your Harley to a professional for further diagnosis and repair.

Remember, if you’re experiencing issues with your Harley’s turn signals or lighting system, it’s important to address the problem as soon as possible. Not only can these issues be frustrating, but they can also be dangerous on the road. By following the steps outlined above, you can diagnose and fix the problem quickly and easily.

Harley Radio and Control Errors

If you’re experiencing issues with your Harley Davidson motorcycle, it’s important to understand the various error codes that can appear on your dashboard. In this section, we’ll explore the different radio and control errors that you might encounter, and what they mean.

Radio Error Codes

One of the most common sources of errors on a Harley Davidson motorcycle is the radio. If you’re experiencing issues with your radio, it’s likely that you’ll see one of the following error codes:

• B1300 Radio voltage high: This error code indicates that the voltage going to the radio is too high. This can be caused by a faulty voltage regulator or a short circuit in the wiring.

• B1301 Radio voltage low: This error code indicates that the voltage going to the radio is too low. This can be caused by a faulty battery or a problem with the wiring.

To troubleshoot these errors, you should start by checking the battery voltage and the wiring leading to the radio. If you’re unable to identify the problem, it’s best to take your motorcycle to a mechanic who can diagnose and fix the issue.

Control Module Faults

Another common source of errors on a Harley Davidson motorcycle is the control module. If you’re experiencing issues with your control module, it’s likely that you’ll see one of the following error codes:

• B0563 Battery Voltage High: This error code indicates that the voltage going to the control module is too high. This can be caused by a faulty voltage regulator or a short circuit in the wiring.

• B1103 LHCM Internal Error: This error code indicates that there is an internal error in the left-hand control module. This can be caused by a faulty module or a problem with the wiring.

• B1121(TSM) Left Turn Output Open: This error code indicates that there is an open circuit in the left turn output of the turn signal module. This can be caused by a faulty module or a problem with the wiring.

To troubleshoot these errors, you should start by checking the wiring leading to the control module. If you’re unable to identify the problem, it’s best to take your motorcycle to a mechanic who can diagnose and fix the issue.

In conclusion, understanding the various error codes that can appear on your Harley Davidson motorcycle is an important part of maintaining and troubleshooting your bike. By familiarizing yourself with these codes, you’ll be better equipped to diagnose and fix any issues that arise.