How to Replace an Electronic Control Relay | YourMechanic Advice

How to Replace an Electronic Control Relay

Electronic relays are used throughout your vehicle. They control everything from electric windows to the electric fuel pump. They are used as a low-voltage trigger for high voltage consuming components. By only triggering components as needed, relays help your vehicle conserve energy. Since the internals of a relay are both electronic and mechanical, think of it as a switch that uses electricity to “switch” itself on. This in turn switches on the component it controls. If one of the electronic components in your car is not working, it is possible that it is time for a new electronic control relay.

Part 1 of 1: Replacing the electronic relay

Materials Needed

common interior fuse relay panel location

Step 1: Locate the relays. With the increasing amount of electronics in modern vehicles, it is possible your vehicle may have more than one fuse/relay box.

There can be multiple locations underhood as well as inside the passenger compartment or trunk.

pulling out the relay

Step 2: Replace the faulty relay. With the key in the off position, remove the faulty relay.

It should simply unplug by hand. Set the faulty relay aside.

Insert the new relay in the correct position. Use as little force as required to remove and install relays as automotive wiring and connectors can be delicate and brittle with age.

  • Note: Older vehicles may have relays mounted to the firewall or inner fender well. Consult your owner’s manual or shop manual for exact locations.

firewall mounted relay

Step 3: Verify the repair. Turn the key to the on position or start the vehicle to verify the component that the relay was for is functioning properly.

Once verified, replace any covers or panels you removed for access.

Because they control many different parts of the car, it can be difficult to tell whether or not your issue is caused by a bad electronic control relay. If you need a diagnosis or relay replacement for your vehicle, contact YourMechanic today to arrange for a mobile technician to come to your home or office.


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Peter

42 years of experience
1301 reviews
Peter
42 years of experience
Ford Expedition - ECM-Power Relay - Waddell, Arizona
Excellent service as always!
Land Rover Range Rover Sport - Brake Pads Replacement (Front) - Phoenix, Arizona
Great mechanic.

Richard

20 years of experience
461 reviews
Richard
20 years of experience
Ford Explorer - ECM-Power Relay - Austell, Georgia
Phenomenal! He was very polite and courteous not to mention he really knew what he was doing! He explained everything to me in a way I could understand. So glad I called! I'll be referring Richard to all my friends and family. Should I ever run into car trouble again, I'm hunting Richard down! Lol... Keep up the good work and have a blessed day!
BMW X3 - Starter - Atlanta, Georgia
He is the best of all mechanics. An asset to your company, value added and vet knowledgable about automobiles.

Mathew

16 years of experience
50 reviews
Mathew
16 years of experience
Dodge Ram 1500 - ECM-Power Relay - Holiday, Florida
Within 10 Minutes of me requesting a mechanic i had a message from mathew. He was very curteous communicated well and did the job very well. I am very please with this service and will be deffinatly using it again. I am just happy my truck is back up and running , He saved the day and made a bad situation better so that my father and i had our vehicle up quick.

Mario

6 years of experience
79 reviews
Mario
6 years of experience
Dodge Stratus - ECM-Power Relay - Richmond, Virginia
Very helpful in trying to figure out the issue with my car. He was very respectful. I will be requesting him again

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