The main relay on a 1988 Honda Accord is located under the left side of the dash, above the fuse/relay block. It is positioned near the left side of the steering column, underneath the instrument cluster. To access the main relay, you may need to remove the cruise control module if your car is equipped with it. The main relay should be marked with the words “RELAY ASS’Y MAIN”.
Please note that the main relay is responsible for controlling the power supply to the ECU (engine control unit) and fuel pump. If you are experiencing issues with starting your Accord, a damaged or broken main relay could be a possible cause.
Contents
- What is the Honda main relay?
- How do you know if you have a bad relay?
- What causes a main relay to fail?
- How do you know if a relay is blown?
- Where is the main relay?
- Where is the main relay on a 1989 Honda Accord?
- What does the main relay control?
- What relay is for main ignition circuits?
- What happens when main relay goes out?
- What are the symptoms of a bad main relay?
What is the Honda main relay?
The main relay in a vehicle controls the fuel pump and supplies power to the injectors. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises.
How do you know if you have a bad relay?
Most modern relays have an LED to tell you if they are in the active state (ON). If that light is off and you’ve got control voltage to the relay or coil terminals (typically A1[line] and A2 [common]) then you can safely assume that relay is bad.
What causes a main relay to fail?
The two most common failure mechanisms of relays are contamination and mechanical wear of the internal switching elements discussed as follows: a. Contamination is a major cause of early life failures.
How do you know if a relay is blown?
Polarity usually doesn’t matter it should click either way. If you don’t hear it click chances are your relay is bad you can try to confirm. That by checking the resistance.
Where is the main relay?
Where To Find the Main Relay. You can find the main relay in your vehicle’s fuse box, which is commonly found under the passenger side dashboard or the engine bay. The fuse box cover will usually show a diagram of the box’s different fuses and relays.
Where is the main relay on a 1989 Honda Accord?
It’s located under the dash on the driver’s side of the car.
What does the main relay control?
Re: what exactly does a main relay do? (
Basically it has two sets of switches inside. When you first turn the key on, you are closing one set of contacts which provides power to the ECU. In turn, the ECU then closes the second set of contacts which powers up the fuel pump.
What relay is for main ignition circuits?
The ignition relay is one of the most important electronic relays found on modern vehicles. It is usually located in the fuse and relay panel beneath the bonnet, and is responsible for providing power to the vehicle’s ignition system, and some of the fuel system’s components.
What happens when main relay goes out?
If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition. You may find that turning the key may power on the accessories, and may even crank the engine.
What are the symptoms of a bad main relay?
If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition. You may find that turning the key may power on the accessories, and may even crank the engine.
