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HomeHow to Bypass a Honda Main Relay: Step-by-Step Guide.

How to Bypass a Honda Main Relay: Step-by-Step Guide.

To bypass a honda main relay, locate it under the dash on the driver’s side and use a piece of wire to connect the fuel pump circuit and the ignition circuit. This will effectively bypass the relay and allow the car to start without it.

Honda main relays can sometimes fail, causing the car to not start. If this happens, you may need to bypass the main relay in order to get the car up and running again. Bypassing the main relay is a relatively simple process that can be done at home with a few basic tools.

In this article, we will provide step-by-step instructions on how to bypass a honda main relay. This guide is intended for informational purposes only and should not be attempted without proper knowledge and expertise.

How to Bypass a Honda Main Relay: Step-by-Step Guide.


Symptoms Of A Faulty Honda Main Relay

If you’re facing an issue with your honda starting and you suspect a faulty main relay, keep reading. Being aware of the symptoms of a bad main relay can help you diagnose and solve the problem. Here are some of the most common symptoms of a faulty honda main relay:

No-Start Or Hard-Start Issues

One of the most troubling indications of a bad main relay is when your honda engine doesn’t start. It might take several attempts of turning the key in the ignition before the engine starts. This problem can often be intermittent with long periods of successful starts before occurrence.

Here are some potential fuel-injection or ignition issues that might mislead you into suspecting a bad main relay:

  • Clogged fuel filter
  • Bad spark plugs
  • Faulty ignition switch

Engine Stall Or Sudden Shut Off

Another symptom of a bad main relay in your honda is sudden engine shut off or stalling. You might experience this at any time while driving, and it is dangerous, especially when driving at high speeds. A failed main relay might activate the fuel pump, but it won’t keep the voltage in check, leading to sudden engine shut-off.

Dimming Or Flickering Of Lights

A shaky, flickering, or dimming interior light of your honda might also be a symptom of a bad main relay. When a relay is failing, one of the first things to act up is the electrical system. It might also happen that these lights and interior accessories won’t work when the car engine is running.

False Check Engine Light Warnings

A bad main relay in a honda may sometimes trigger the check engine light. When the main relay fails to provide sufficient, consistent voltage to the engine control module, it can result in sporadic and dangerous malfunctions. The check engine light can be an indication of this.

Other Relevant Symptoms

Some other symptoms that shouldn’t be overlooked include:

  • Inconsistent fuel pump humming
  • Failed relay creating a significant drain on the car battery
  • A constantly running fuel pump

Remember that understanding the signs of a bad main relay can help you diagnose the issue before it becomes more significant. By keeping on top of these symptoms, you’ll be able to enjoy your honda running as smoothly as possible.

Tools Required

If you own a honda vehicle, there might come a time when the car won’t start, and one of the possible culprits might be the main relay. Fortunately, with some basic knowledge and the right tools, you can bypass the honda main relay.

In this guide, we’ll take you through the necessary tools for the job and offer some crucial safety tips to help you carry out the process effectively and safely.

List Of The Tools Needed To Bypass The Honda Main Relay

Before we dive into the step-by-step guide, it’s important to note that you’ll need a few essential items for the job. Here’s a list of the tools you’ll need:

  • A standard screwdriver
  • A pair of pliers
  • A wire cutter/stripper
  • A ten-amp fuse
  • A jumper wire

Safety Precautions

Working on a car can be dangerous, so it’s vital to take all necessary precautions beforehand. Here are some practical safety tips to consider:

  • Before starting any work, ensure that the vehicle’s engine and other components have cooled down.
  • Disconnect the car battery before removing the main relay to avoid any electrical mishaps.
  • Wear tight-fitting protective gear like gloves and goggles to protect your hands and eyes.
  • Ensure that all the car’s gear is in park and that the parking brake is on before starting any work.
  • Read the car manual to understand the specifics of the main relay bypass since the bypass process may vary for different honda models.

Now that you have a comprehensive list of the necessary tools and the critical safety precautions to follow let’s dive into the step-by-step bypass process. Remember, always double-check every step before carrying it out to guarantee a smooth and safe process.

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Step-By-Step Guide To Bypass The Honda Main Relay

Disconnecting The Battery

Before starting the process of bypassing the honda main relay, it is crucial to disconnect the battery for your safety and the vehicle’s safety. Here are the following steps to disconnect the battery:

  • Locate the battery and its negative terminal (marked by a minus sign).
  • Loosen the negative terminal with a wrench.
  • Detach the negative battery cable (the one connected to the negative terminal) from the battery.
  • Ensure that the disconnected battery cable is placed away from the battery’s negative terminal to prevent accidental reconnection.

Locating The Honda Main Relay

The honda main relay can be challenging to locate, but it is usually situated underneath the dashboard on the driver’s side of the car. Follow the following steps to locate the main relay:

  • Sit in the driver’s seat of the car and position yourself so that you can see underneath the dashboard.
  • Look for the fuse box panel, which is typically located on the driver’s side of the vehicle.
  • Find the main relay, which is usually a small rectangular-shaped box with wires or cables coming out of it.

Bypassing The Main Relay

Bypassing the main relay in a honda vehicle can be done by following these steps:

  • Turn off the engine and ensure that your vehicle is in park if it’s an automatic transmission or neutral if it’s a manual transmission.
  • Remove the plastic cover that surrounds the main relay to access the wiring harness inside.
  • Locate the two thicker wires that come out of the main relay and connect them with a jumper wire.
  • Connect one end of the jumper wire to the two thicker wires you just located.
  • Connect the other end of the jumper wire to a 12v power wire.

Reconnecting The Battery

After bypassing the main relay, it is time to reconnect the battery, and these are the steps you need to follow:

  • Reconnect the negative battery cable to the negative terminal of the battery.
  • Tighten the negative battery cable with a wrench.
  • Ensure that the disconnected battery cable is far from the negative terminal to avoid accidental reconnection.

Testing The New Setup

Now that you have bypassed the main relay and reconnected the battery, it is essential to test the new setup to ensure it is working correctly. Here’s how to test the new setup:

  • Turn the key in the ignition and ensure that the engine is starting up.
  • Listen for any unusual sounds coming from the engine.
  • Observe the dashboard gauges to ensure that all the readings are accurate.

Troubleshooting Tips

If your newly bypassed main relay is not working correctly, try the following troubleshooting tips:

  • Double-check the wiring connections to ensure that all the wires are secure and in the correct positions.
  • Check whether the jumper wire is damaged or broken.
  • Use a voltmeter or multimeter to check whether the power supply is working correctly.
  • Consult a professional mechanic for more technical issues.

By following these step-by-step guidelines, you can successfully bypass the honda main relay on your vehicle.

Frequently Asked Questions (Faqs)

If you own a honda, you are likely familiar with the main relay, which can cause frustrating problems when it malfunctions. Whether you are experiencing starting or stalling issues, understanding the ins and outs of the honda main relay can help you get back on the road quickly.

In this guide, we will explore frequently asked questions about the honda main relay, provide comprehensive answers to those questions, and touch on other relevant issues related to honda relays.

Commonly Asked Questions About The Honda Main Relay

What Is A Main Relay?

A main relay is an electrical device that enables the flow of electricity from your car’s battery to the different components of your car.

What Does A Honda Main Relay Do?

The main relay sends power to the fuel pump, which allows the fuel system to pressurize and the engine to start.

How Can I Tell If My Main Relay Is Faulty?

Common signs of a faulty main relay include difficulty starting the car or the car stalling while driving. If you hear your fuel pump turning on but the engine won’t start, it could also be a sign of a bad main relay.

Comprehensive Answers To The Faqs

How Do I Bypass The Honda Main Relay?

To bypass the main relay, locate the relay in your car’s fuse box, unplug it, and use a jumper wire or paperclip to connect the two terminals of the relay harness. However, this is only a temporary solution and should not be relied on long term.

Can I Fix A Faulty Honda Main Relay?

Yes, if the main relay is indeed the problem, it can be fixed. However, if the relay is beyond repair, it will need to be replaced.

Is It Safe To Drive With A Faulty Main Relay?

It is not recommended to continue driving with a faulty main relay, as it can cause further damage and potentially leave you stranded.

Other Relevant Issues

How Often Should I Replace My Honda Main Relay?

There is no set time frame for when you should replace your main relay. It is important to keep an eye out for symptoms and address them as soon as possible to prevent further damage to other components.

Can A Bad Fuel Pump Be Mistaken For A Bad Main Relay?

Yes, because the main relay controls the power to the fuel pump, a bad fuel pump can often be mistaken for a bad main relay. It’s important to have a professional diagnose the issue to ensure the correct part is replaced.

Understanding the main relay in your honda can seem daunting, but with these frequently asked questions and comprehensive answers, you can feel confident in troubleshooting any issues you may encounter. Remember to always consult a professional if you are unsure about any repairs or replacements.

Frequently Asked Questions Of How To Bypass A Honda Main Relay

What Is A Honda Main Relay?

The honda main relay controls power to the fuel pump and other systems. It’s a critical component that can cause starting problems if it fails.

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

If your honda won’t start, even after you turn the key in the ignition, and you hear a clicking sound, the main relay might be bad. You can try bypassing the relay to confirm whether it’s the source of the problem.

Can I Bypass The Honda Main Relay?

Yes, you can bypass the honda main relay. It’s a temporary fix, though, and you’ll need to replace the relay as soon as possible. Bypassing the relay can help you confirm whether it’s the source of a starting problem.

Is It Safe To Bypass The Honda Main Relay?

Bypassing the honda main relay is generally safe as long as you follow the proper procedure. Make sure to disconnect the battery first and take precautions to avoid injury from hot components. Keep in mind that bypassing the relay is only a temporary fix.

Can I Drive With A Bad Honda Main Relay?

You shouldn’t attempt to drive your honda with a bad main relay. Doing so can cause starting problems and may leave you stranded. Replace the relay as soon as possible.


Overall, bypassing a honda main relay is not recommended unless it is absolutely necessary. It is important to understand the possible risks associated with bypassing the main relay, as well as the potential consequences that could result from improper installation or use.

If you do decide to bypass the main relay, be sure to carefully follow the steps outlined in this guide and to exercise caution throughout the process. Additionally, it is always a good idea to consult with a trusted mechanic or expert in honda repairs before attempting any major vehicle modifications or repairs.

With the right knowledge and approach, however, it is possible to safely bypass your honda main relay and get your vehicle up and running again in no time.



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