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5 Pin Relay Question


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apolandi
New User

Jul 18, 2019, 7:52 AM

Post #1 of 6 (119 views)
5 Pin Relay Question Sign In

Hi,

I'm trying to find a replacement 5 pin relay to the a Denso relay i have which has gone bad, 056700-7240

I managed to source a similar 5 pin relay from Denso, 056700-6780 but i'm not sure its completely interchangeable.

Do all 5 pin relays share the same pin-out and mechanism? if not, what is the difference?

Any help would be much appreciated!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 18, 2019, 8:07 AM

Post #2 of 6 (112 views)
Re: 5 Pin Relay Question Sign In

Yes, most 5 pin relays work the same. The 5th pin is usually a rest position for a circuit path when the relay is not turned on. You can look at the bottom of the relay and make sure none of the pins are joined together.

Check closely to determine if that pin is even being used. Most are not. They have 5 pins but one slot is empty.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
Sidom profile image

Jul 19, 2019, 6:53 PM

Post #3 of 6 (82 views)
Re: 5 Pin Relay Question Sign In

The pinout are the same, but some have differences in the terminal lugs. How the relay plugs into the connector, those have to match obviously.

The pinouts are #85 & #86 are the control side #85 is usually power and #86 ground but these terminals are reversible since it's just for a coil control. The load side consists of #30 which is power & #87 & #87a which is the terminals for both of the loads.

All relays do the same job, they are an electromechanical devise that uses a low current circuit to control a high current circuit. (that is an ASE L1 test question answer)
In a nutshell it's a switch, to keep the spark that happens when you turn something on away from everything and keep it isolated into a little plastic box


apolandi
New User

Jul 20, 2019, 10:27 AM

Post #4 of 6 (60 views)
Re: 5 Pin Relay Question Sign In

Thank your very much for the comments!


In Reply To
Yes, most 5 pin relays work the same. The 5th pin is usually a rest position for a circuit path when the relay is not turned on. You can look at the bottom of the relay and make sure none of the pins are joined together.

Check closely to determine if that pin is even being used. Most are not. They have 5 pins but one slot is empty.


The 5th pin isn't being used, the harness connects only to 4 of the relay pins.


In Reply To
The pinout are the same, but some have differences in the terminal lugs. How the relay plugs into the connector, those have to match obviously.

The pinouts are #85 & #86 are the control side #85 is usually power and #86 ground but these terminals are reversible since it's just for a coil control. The load side consists of #30 which is power & #87 & #87a which is the terminals for both of the loads.

All relays do the same job, they are an electromechanical devise that uses a low current circuit to control a high current circuit. (that is an ASE L1 test question answer)
In a nutshell it's a switch, to keep the spark that happens when you turn something on away from everything and keep it isolated into a little plastic box


Both relay connectors are identical in terms of terminal plugs.

If they are all virtually the same, why does every manufacturer have a large number of 5 pin relays then?

I'm just afraid of causing damage by connecting the replacement relay.

Thanks for the help!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 20, 2019, 12:05 PM

Post #5 of 6 (52 views)
Re: 5 Pin Relay Question Sign In

If it's only a 4 wire relay, then it doesn't matter. Either one will work as long as the plug accommodates the extra pin.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
Sidom profile image

Jul 20, 2019, 12:19 PM

Post #6 of 6 (48 views)
Re: 5 Pin Relay Question Sign In

There are a lot of reason for the different part #s. The parts companies make the relays for all the different car manufacturers, there are all types of different loads, pumps, motors, etc. different current requirements.

A relay is just a switch, that all it does is turns on a load (supplies power) when the controls side is energized, by either supplying a ground or 12v to terminals #85 & #86. The coil pulls the switch closed that is in between #30 & #87, the circuit is completed and current flows.

Most relays have the pins/lugs numbered, if you look on the bottom of the relay or the diagram on the side you will see the locations. As long as #s 30, 87, 85 & 86 are all in the same spot, then no damage can occur. If #87 is on the terminal for #86, that is for the PCM ground and then that could be a big problem.

You are doing the right thing, on something you are sure about, you are checking it out 1st before just jumping in and doing something.
At the end of the day if you aren't comfortable with using a relay you aren't sure about, I would suggest getting the right part # and have peace of mind.






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