How to Bypass a Honda Main Relay: Tips and Tricks.


    To bypass a honda main relay, locate and remove the relay, then bridge the battery and ignition terminals. Honda main relays are notorious for causing starting issues, and a faulty relay can prevent the engine from starting altogether.

    If you’re experiencing a no-start issue with your honda, the main relay may be the culprit. The main relay is responsible for supplying power to the fuel pump and igniter, critical components needed for the engine to start. The good news is that bypassing the main relay is a fairly straightforward process that can be done with a few simple tools.

    In this article, we’ll guide you through the steps to bypass a honda main relay and get your car back on the road. So, let’s get started!

    How to Bypass a Honda Main Relay: Tips and Tricks.


    Identifying A Faulty Honda Main Relay

    There’s nothing more frustrating than trying to start your car and realizing the engine won’t turn over. Before you start panicking, it’s crucial to identify the issue. One common problem with honda vehicles is a faulty main relay. In this section, we will discuss how to identify a faulty honda main relay by highlighting its symptoms, checking for faults, and diagnosing the issue.

    Symptoms Of A Bad Honda Main Relay

    When your honda won’t start, there could be several reasons for it. However, if you notice the following signs, there is a high chance that the main relay is faulty:

    • The engine won’t start.
    • The engine may start but unexpectedly stall out
    • The engine starts and runs fine for a while, but then dies
    • The car won’t start intermittently
    • You may hear a clicking sound when you turn the key

    Checking Honda Main Relay For Faults

    Before diagnosing any issue, you need to check whether the main relay is faulty or not. Here are the steps to follow:

    • Locate the honda’s fuse box, located under the dashboard on the driver’s side.
    • Open the cover and find the main relay.
    • Carefully remove the main relay from the fuse box.
    • Check for any damage to the relay itself or its pins on the connector plug.
    • If you can see any damage, replace the relay.

    How To Diagnose A Bad Honda Main Relay

    If you have ruled out any other issues with your car, and the main relay is suspected to be the cause, here are the steps to follow to diagnose the issue:

    • Make sure the battery is fully charged.
    • Turn on the ignition and listen for the fuel pump’s buzzing sound.
    • If you don’t hear any sound or if the buzzing sound is weak and inconsistent, it indicates that the main relay is faulty.
    • You can also test the main relay using a multimeter tool to check for continuity.

    Identifying a faulty honda main relay is not impossible, but it can be tricky. By recognizing the symptoms, checking for faults, and diagnosing the issue, you can quickly fix the problem and have your honda vehicle back on the road in no time.

    Remember that if you are not confident doing these repairs yourself, it’s better to consult a professional.

    Tools Required For Bypassing A Honda Main Relay

    Bypassing your honda’s main relay is something that can be done with the right tools and proper knowledge. However, it can be dangerous if not handled correctly. In this section, we’ll discuss the necessary safety precautions and tools required for bypassing a honda main relay.

    Safety Precautions Before Handling Honda Main Relay

    Before we dive into discussing the tools needed, it’s essential to take note of the necessary safety precautions. Here are some things you should bear in mind:

    • Always wear safety gloves to avoid electrical shock or injury.
    • Make sure the engine is switched off, and the keys are removed before attempting any repairs.
    • Keep your work area clean and dry to avoid accidents.
    • If you’re not sure about what you’re doing, seek professional help.

    List Of Necessary Tools

    Now that you’re aware of the safety precautions, let’s discuss the required tools needed to bypass your honda’s main relay. Here are the necessary tools you should have:

    • A set of screwdrivers: You’ll need a set of screwdrivers to unscrew the electrical components of your car.
    • Electrical tape: You’ll need electrical tape to insulate the exposed wires after you’ve bypassed the relay.
    • Wire cutters: You’ll need wire cutters to cut and strip the wires safely.
    • A voltmeter: A voltmeter will help you check the voltage of your car’s electrical system.
    • A jumper wire: A jumper wire helps you bridge the circuit to bypass the relay while testing.

    How To Prepare For Bypassing Honda Main Relay

    Once you have your tools ready, you’ll need to prepare for bypassing the main relay. Here are the steps you should take:

    • Open the hood of your car and locate the main relay. You’ll usually find it close to the battery on most honda models.
    • Disconnect the negative terminal from your car battery.
    • Use your screwdriver to remove the main relay cover.
    • Locate the two smaller pins, which are the control circuit pins.
    • Cut the wire that connects to the second control pin, which should be green with a red stripe.
    • Connect the jumper wire to the cut green and red wire, creating a bridge between the two control circuit pins.
    • Wrap the exposed wires with electrical tape, insulating them to prevent any electrical shocks.
    • Reinsert the main relay cover and reconnect the negative terminal to the car battery.

    Bypassing a honda main relay requires a few necessary tools and proper safety precautions. As a diyer, it’s essential to know the steps to take and how to handle the tools correctly. By following the tips and tricks discussed in this section, you can safely bypass your honda main relay and prevent any electrical accidents.

    Step-By-Step Guide To Bypassing A Honda Main Relay

    Steps To Bypass Honda Main Relay:

    If you are a honda owner and your car won’t start, the most probable cause could be an issue with the main relay. A honda main relay is a crucial electrical component that supplies electric power to the fuel pump and to the engine’s ignition system.

    Bypassing a honda main relay can be a temporary solution to get your vehicle running until you can have it repaired. Here’s a step-by-step guide to follow if you need to bypass the main relay:

    1. Locate The Relay:

    The first step is to locate the main relay of your honda vehicle. Usually, the relay is underneath the dashboard on the driver’s side. Check your owner’s manual in case you have trouble finding it.

    2. Remove The Relay Cover:

    Once you locate the relay, remove its cover. The cover should be easy to remove; you can use your fingers to pry it off. However, if you can’t remove it easily, use a flathead screwdriver to gently pry it off.

    3. Expose The Connectors:

    To bypass the relay, you need to locate the connectors. The relay has two connectors, which are female, and they are easy to identify. Pry the connectors out of the relay’s body and expose the male connectors inside.

    4. Connect The Male Connectors:

    Now, take a small piece of wire and connect the two male connectors. It doesn’t matter which wire you connect first. Make sure that you stick the wire firmly into the connectors to ensure a solid connection.

    5. Use The Key To Start The Engine:

    With the wire connected, turn the key in the ignition switch to the “on” position. You should hear the fuel pump turn on. After that, turn the key to the “start” position to start the engine.

    Detailed Explanation Of Each Step:

    The first step is to locate the relay, which is usually under the dashboard on the driver’s side. Once the location is known, the cover of the relay can be removed by prying it off using fingers or a screwdriver.

    After removing the cover, you’ll need to expose the connectors by pulling on the female connectors. The next step is to connect the male connectors using a small piece of wire. Once they are connected, you can turn the key to the “on” position, which will turn on the fuel pump.

    Lastly, turn the key to the “start” position to start the engine.

    Common Pitfalls And How To Avoid Them:

    Although bypassing a honda main relay can be a quick and temporary solution to start your engine, doing it too often can damage other electrical components in the car. So, it’s best to consider it as a last resort. Here are some common pitfalls and how to avoid them:

    • One common pitfall is disconnecting the male connectors after bypassing the relay. Forgetting to disconnect them can damage the car’s electrical system. After starting the engine, disconnect the wire and put back the connectors in the relay.
    • Another pitfall is that bypassing the relay can cause the fuel pump to remain on, even when the engine is off. This can cause the pump to overheat, damage it, and drain the battery. Avoid using this method more than necessary and have it repaired by a professional mechanic.

    By following these steps, you can temporarily bypass a honda main relay and start your car quickly. However, always remember to disconnect the wire after starting the engine and consider it as a temporary solution. It’s best to have your car checked and repaired by a professional mechanic for a permanent solution to any electrical problems.

    Testing And Validation After Bypassing A Honda Main Relay

    Bypassing a honda main relay can be an effective solution to engine problems. However, it is essential to carry out testing and validation after the bypassing process to ensure it has been done correctly and that there are no further issues.

    How To Test Honda Main Relay After Bypassing

    Testing the honda main relay is necessary to identify any issues and verify that the bypass was successful. Follow the steps below:

    • Locate the main relay under the dashboard on the driver’s side.
    • Turn on the ignition key and listen for a click sound. This click confirms that current has reached the fuel pump.
    • Use a multimeter to check if there is power being supplied from the relay to the fuel pump.

    Validating The Effectiveness Of Bypassing Honda Main Relay

    After bypassing the honda main relay, it becomes vital to validate the effectiveness of the process. Follow the steps below:

    • Turn on the ignition to run the fuel pump.
    • Listen for any unusual sounds. Excess noise could indicate a problem with the bypass installation or fuel pump malfunction.
    • Check that the engine starts immediately, without any hesitation or delay.

    Precautions To Take After Bypassing Honda Main Relay

    There are several precautions to consider after bypassing the honda main relay:

    • Ensure that the fuel pump and engine components are powered off before starting any work.
    • Carry out the bypass process only if you have a thorough understanding of the vehicle’s electrical system. If you are unsure, seek the assistance of a professional mechanic.
    • Observe proper personal safety precautions, including using gloves, goggles, and any other protective gear as necessary.
    • Ensure that all connections are secure and tight.

    Testing and validation of the honda main relay bypass are essential to ensure that the engine is running correctly and there are no further issues. Follow the steps carefully, take necessary precautions, and seek expert help if needed. Remember, safety is the priority.

    Frequently Asked Questions For How To Bypass A Honda Main Relay

    What Is A Honda Main Relay Used For?

    A honda main relay is used to control the fuel pump, ecm, and starter solenoid. It ensures that the electrical system is working correctly and prevents the engine from starting if there are any issues.

    How Do I Know If My Honda Main Relay Is Faulty?

    If your honda main relay is faulty, you may experience problems starting your car or notice that your car starts and then stalls. You may also hear a clicking sound when you turn the key in the ignition.

    Can I Bypass My Honda Main Relay?

    Yes, you can bypass your honda main relay. This can be useful if you are having trouble starting your car and suspect that the main relay is the issue. However, it’s important to note that bypassing the main relay is not a long-term solution.

    How Do I Bypass A Honda Main Relay?

    To bypass a honda main relay, you will need to locate the relay, remove the cover, and identify the terminals. You can then create a connection between the terminals using a jumper wire to bypass the relay.

    Is It Safe To Bypass A Honda Main Relay?

    Bypassing a honda main relay can be safe if done correctly and temporarily. However, it’s important to address the underlying issue causing the problem in the first place. If you’re not sure how to bypass the main relay or address the issue, it’s best to consult a professional mechanic.


    To sum up, bypassing a honda main relay is possible if you follow the methods mentioned above. It is important to remember that this is not a permanent solution and you should eventually get the relay replaced by a professional mechanic.

    However, bypassing the relay can be a helpful temporary fix if you do not want to get stranded on the side of the road and need to get your honda to a nearby repair shop. It is crucial to follow the steps mentioned in the right order and take all necessary precautions while attempting this fix.

    We hope this guide has been informative and helpful for you, and you can now feel confident in your ability to bypass the honda main relay.


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