How to Bypass a Honda Main Relay: Quick and Easy Steps.

Bypassing a honda main relay requires bridging specific connections in the relay’s circuit board or replacing the entire relay. If your honda won’t start or it stalls due to a faulty main relay, you can bypass this component to get back on the road.

The main relay is responsible for supplying power to the fuel injectors, the fuel pump, and other critical systems in your honda. In most cases, a faulty or damaged main relay can result in a non-starting condition, making it important to learn how to bypass it.

The process requires either bridging specific connections in the relay’s circuit board or replacing the entire relay. In this article, we will explore how to bypass a honda main relay to get your car moving again.

How to Bypass a Honda Main Relay: Quick and Easy Steps.


Symptoms Of A Bad Honda Main Relay

Discussion Of Typical Warning Signs That A Honda Main Relay Is Faulty

A honda main relay is a small electrical component in your car that allows the powertrain control module (pcm) to energize the fuel pump, ecu, and fuel injectors. If it goes bad, it can result in several problems, leading to malfunctions and poor driving performance.

Here are some typical warning signs that indicate a honda main relay is faulty:

  • The engine cranks but doesn’t start: This is a classic sign of a failing main relay. When it fails, the fuel pump doesn’t energize, fuel injectors don’t fire, and the ecu doesn’t receive power, leading to the engine failing to start.
  • Starting difficulties: If your honda takes a few cranks to start, or you have to wiggle or adjust the key in the ignition to get it to start, it can be a sign of a failing main relay.
  • Stalling or hesitation: When your honda’s main relay starts failing, it can cause unexpected stalling or hesitation while driving. It happens because of the intermittent loss of power to the vital components responsible for keeping the engine running.
  • Dash lights not illuminating: The main relay usually supplies power to the dashboard lights and other electronic accessories. So if your dashboard lights are not working or are dim, it could indicate a faulty main relay.

Commonly Seen Issues With Honda Main Relays

The honda main relay is a critical component of your car’s internal electrical system. It is responsible for enabling the pcm to power up several critical components, including the ecu, fuel injectors, and fuel pump. Here are some commonly seen issues with honda main relays:

  • Burnt contacts: The main relay can develop burnt contacts when the electrical current it provides is higher than it can handle. Over time, this causes damage to the contacts leading to arcing, carbon build-up and, eventually, a weak or failed connection.
  • Corrosion: The honda main relay is in constant contact with the electrical system. Corrosion can occur over time due to exposure to the elements, moisture, or humidity. Corrosion can lead to dirty contacts and a weak or failed connection.
  • Heat damage: Heat damage can occur when the main relay is subjected to high temperatures. Prolonged exposure to high temperatures can damage the relay’s internal components and disrupt the current flow and lead to a weak or failed connection.
  • Poor soldering: Poor soldering can cause issues with the honda main relay. If there are any cold solder joints, the connection can become weak, causing the relay to fail. It is essential to ensure that the soldering is strong and leads to a sustainable connection that lasts through time.

Keeping an eye out for these common issues and warning signs can help you prevent a potential problem with your honda main relay. If you suspect that your honda main relay is faulty, it is always best to seek the help of a professional mechanic.

They can perform tests to diagnose the issue and replace the relay, ensuring that your car stays running smoothly.

Understanding The Honda Main Relay

The honda main relay plays a crucial role in your car’s electrical system, as it controls the fuel pump and ignition. Understanding how it works can prove beneficial in emergency situations, as it’s prone to fail after extended use.

Explanation Of The Function Of The Honda Main Relay Within The Vehicle’S Electrical System

The honda main relay switches on the fuel pump and ignition once the key is turned, providing power to the entire vehicle. It’s connected to the battery, dashboard lights and ecu. Once activated, it energizes the fuel pump, delivering gasoline to the engine and spark plugs.

If the main relay fails, it’s not possible to drive your vehicle.

Identification Of Key Components Within The Relay

The main relay is situated under your dashboard, next to the fuse box. It consists of several essential components such as:

  • Coil: It’s an electromagnetic component that triggers the switch.
  • Switch: It’s a power switch that turns the relay on and off.
  • Capacitor: It stores and releases energy to amplify the electromagnetic field.
  • Resistor: It limits the flow of electricity to the coil to stop it from overheating.

Ensure that you have identified all these components before attempting to bypass the main relay. In the next section, we’ll go into how to bypass the honda main relay.

Steps For Bypassing A Honda Main Relay

Bypassing a honda main relay can be a complicated process, but it can also save you a lot of time and money. In this post, we will provide you with the necessary tools and steps to bypass the honda main relay, making sure that you take the correct precautions to avoid any accidents.

Necessary Tools And Equipment For Bypassing A Honda Main Relay

Before starting the bypassing process, you need to have the appropriate tools and equipment at hand. We recommend having the following:

  • A set of screwdrivers, including phillips and flat-head screwdrivers
  • Wire cutters
  • A volkman dent puller
  • A soldering iron
  • Heat shrink tubing
  • Electrical tape

Detailed Guide On How To Bypass The Relay Along With Visuals

Now that you have all the necessary equipment let’s get started on the process.

Step 1: turn off the engine of your car and wait for a couple of minutes for the engine to cool down.

Step 2: disconnect the battery terminal from the negative connector to avoid any electrical accidents.

Step 3: locate the main relay (under the dash on the driver’s side) and remove the cover by unscrewing the screws.

Step 4: when the cover is off, locate pins 5 and 2 on the main relay (these are the larger brass pins).

Step 5: use the volkman dent puller to remove the pins by inserting the tool below the pin and pulling outwards. Make sure not to apply too much pressure, which can damage the relay harness.

Step 6: cut the wire lengths to an appropriate size and strip the ends of the wires for soldering.

Step 7: solder the stripped ends of the wires onto the pins 5 and 2 you removed in step 5.

Step 8: after soldering the wires, insulate them with heat shrink tubing and protect them with electrical tape.

Step 9: replace the cover and screw back the screws securing the main relay.

Step 10: reconnect the battery terminal to the negative connector and turn on the engine to test the success of the bypass.

Precautions To Take When Bypassing The Honda Relay

Safety comes first when handling electrical equipment, and bypassing a honda main relay is no exception. It is essential to take the following precautions:

  • Ensure that you have switched off the engine and that the battery is disconnected from the negative connector before performing any work.
  • Always use safety gloves and goggles when handling electrical equipment to protect against potential electrical injuries.
  • Avoid applying too much pressure when using the volkman dent puller, which can damage the relay harness.
  • Solder with caution and ensure that the wires are properly insulated and secured with heat shrink tubing and electrical tape to prevent any short circuits.

Bypassing a honda main relay may sound like a daunting task, but if you follow the necessary tools, detailed steps, and precautions, it can be a quick and easy job. Remember to prioritize your safety to avoid any potential electrical accidents.

Emergency Alternatives To Bypassing The Honda Main Relay

It’s not uncommon to find yourself stuck with a faulty main relay in your honda. Whether you’re out on the road or stranded in a parking lot, it’s essential to know a few emergency alternatives to bypass the honda main relay.

We’ll discuss some quick fixes that can help you to get out of a difficult situation without having to deal with complicated repairs or replacements.

Discussing Temporary Measures That Can Be Taken

It’s important to remember that these measures should be considered as last resorts, and should not be seen as permanent solutions. Here are a few steps you can take:

  • Tap the main relay lightly: Sometimes, a light tap can bring the main relay back to life. However, it’s challenging to determine the severity of the issue, and this fix may not work in every situation.
  • Clean the contacts: Alternatively, you can try cleaning the contacts. Corrosion and grime can cause poor contact, leading to a malfunctioning main relay.
  • Check the electrical wiring: Make sure that the main relay plug is making strong electrical contact by examining the wiring connection.

Highlighting The Risks And Drawbacks Of Such Alternatives

It’s crucial to keep in mind that these solutions should only be used if you cannot immediately access a mechanic or a honda repair shop. While they may come in handy in times of distress, they are not designed to hold up over time.

Here are some disadvantages to be aware of:

  • Not a long-term solution: Since these methods are temporary, you cannot rely on them to solve mechanical problems that may require professional attention and repairs.
  • May damage other parts: If the problem is not with the main relay, these temporary fixes might further damage the car’s interior.
  • Risk of electrical injury: Attempting to fix the issue on your own can be hazardous, especially if you’re not knowledgeable about car mechanics. Wires and contacts carry electrical currents that can harm an amateur easily.

While these alternatives to bypassing the honda main relay may seem helpful in times of distress, they should be used with caution and only as a last resort. It’s vital to address the problem as quickly as possible by consulting a professional mechanic, rather than trying these diy solutions.

Remember, your safety should always be your top priority, and a little patience can save you from a world of trouble.

Frequently Asked Questions Of How To Bypass A Honda Main Relay

How Do I Know If I Need To Bypass My Honda Main Relay?

If your honda won’t start, the problem may be with the main relay. You can tell if it is the main relay causing the problem if you turn the key to “on” and hear a clicking sound from the engine compartment.

Can I Bypass A Honda Main Relay Myself?

Yes, you can bypass a honda main relay yourself. However, you should have some knowledge of car electronics to avoid damaging the relay or other parts of the car. Follow the steps in this guide carefully.

What Tools Do I Need To Bypass A Honda Main Relay?

To bypass a honda main relay, you will need a pair of pliers, a small wire, and a screwdriver. You may also need a voltmeter to test if the main relay is the problem.

Is It Safe To Bypass A Honda Main Relay?

Bypassing a honda main relay can be safe if you follow the steps carefully and use the right tools. However, if you are not experienced with car electronics, it is best to take the car to a mechanic to avoid causing more damage to the car.

How Long Does It Take To Bypass A Honda Main Relay?

Bypassing a honda main relay should take no more than an hour if you have some experience with car electronics. However, if it is your first time, it may take longer. Take your time and follow the steps carefully to avoid damaging the car.

Can Bypassing A Honda Main Relay Solve All Starting Problems?

No, bypassing a honda main relay will only solve starting problems that are caused by the main relay itself. There may be other reasons why your honda won’t start, and it is best to have a mechanic diagnose the problem to avoid wasting time and money on unnecessary repairs.


After following the steps mentioned above, you should be able to bypass your honda’s main relay successfully. It’s always recommended to seek professional help if you’re not confident with diy repairs because tampering with electrical components can be dangerous. In case the problem persists, there might be another underlying issue with your vehicle.

Troubleshooting electrical systems can be challenging, but it’s not impossible. We hope this guide helped you save some time and money on unnecessary repairs. Remember to always be safe and cautious when working around electrical components. Regular maintenance and repairs can keep your car running for years to come, and knowing how to attend minor repairs on your own can help you avoid unnecessary costs.

We hope our guide proved helpful, and happy repairing!

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