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relays

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How to Replace a Horn Relay
A car horn uses a horn relay to power it and make sound. A faulty relay can be replaced by safely disconnecting the old one and plugging in a new one.
How to Replace a Starter Relay
Starter relays are faulty if there are problems starting the engine, the starter stays on after cranking, or a clicking noise comes from the starter.
Signs of a Bad or Failing AC Compressor Relay
Common signs include inconsistent cooling, not hearing a click from the compressor turning on, and no cold air.
Symptoms of a Bad or Failing Blower Motor Relay
If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay.
Symptoms of a Bad or Failing Starter Relay
Common signs include the vehicle not starting, starter staying on after the engine started, intermittent issues starting, and a clicking sound.
Symptoms of a Bad or Failing Fuel Pump Relay
If the engine is stalling or not starting, or the fuel pump is not making any noise when the key is on, you may need to replace the fuel pump relay.
How to Replace a Condenser Fan Relay
A condenser fan relay operates the fan that removes heat from the engine. If faulty, it will not allow the A/C to blow cool air or function at all.
How to Replace an Anti-Lock Control Relay
ABS brakes use an anti-lock control relay to regulate the pressure of the brake fluid in the ABS system. The control relay breaks down over time.
How to Replace an Anti-Lock Brake System (ABS) Fuse or Relay on Most Cars
Anti-lock brake systems have a fuse that fails if the ABS brake light is on or when the fuse is blown. The wheels may lock up if the ABS fuse is bad.
How to Replace a Fuel Pump Relay
The fuel pump has a relay that fails when there is no audible humming sound as the ignition is turned and when the car cranks after longer than usual.
How to Replace a Headlight Closure Relay
Your headlights depend on the headlight relay located in your vehicle’s fuse box. Occasionally these relays need to be replaced.
How to Replace an Ignition Relay
Common signs of a damaged or broken ignition relay include a low/dead battery, the car stalling or not starting, or loss of power to the dash lights.
How to Replace an Electronic Control Relay
Electronic control relays are tied to many components in your car. When an electronic part doesn't work in your car you may need to replace a relay.
How to Replace an Intermittent Wiper Relay
If the windshield wipers function on high and low but do not work on the intermittent setting, then your intermittent wiper relay may be faulty.
How to Replace a Door Lock Relay
Electric door locks work via a door lock relay located near the brake pedal, behind the stereo, behind the passenger air bag, or under the hood.
How to Replace an Automatic Shutdown Relay
The ASD (Automatic Shutdown) relay is failing when electrical functions in the vehicle are inoperative or when the car will not start.
How to Replace a Heater Blower Motor Switch or Relay
The motor switch on your heater and air conditioning goes bad when the switch gets stuck in certain positions or will not budge at all.
How Long Does a Main Relay (Computer/Fuel System) Last?
Common signs include the engine not starting, inability to stay running for a long time, and no communication with scan tools.
How to Replace a Cooling Fan Relay on Most Vehicles
Cooling fan relays fail when the radiator cooling fan no longer receives an electrical signal. A broken fan relay means the radiator cannot cool down.
How to Replace an Air Conditioning Compressor Relay
The air conditioning compressor relay supplies power to the compressor for AC function. This relay should be replaced if it's proven to be faulty.

Related questions

Question
Fuel pump - 1998 Chevrolet Blazer
hello - yes, this could be the fuel pump failing, but could also be the fuel pump fuse(s) or relay. Either of these would cause the fuel pump to stop working, even if it was good. I recommend a car...
Question
Why wont my car start?
The click noise you hear is the starter relay working but it may not be sending power to the starter solenoid. You would need to try and replace the starter relay that is clicking and see if it cranks. If...
Question
Starting issues
Hello and thanks for writing in. Depending on what the vehicle does when trying to start it may help to narrow this down. If it produces a click sound, this may be related to a faulty starter solenoid. If it...
Question
no power to fuel pump
Hi - Check the ignition switch. You are going to have one wire from the fuel pump relay to the ignition switch. As you turn the key on, this is what powers the relay to turn on the fuel pump....
Question
No power to fuel pump
Sounds like you might have an electrical issue. If all 4 wires on the relay had power, there is something wrong with the wiring. The relay wires should have ground on two wires, power on one wire and switched power...
Question
My headlights won't turn off
A fault in the circuit, such as a stuck closed (fused) switch or relay is causing the circuit to stay powered on even after you have commanded the circuit off through the combination switch. To isolate the faulty component, please...
Question
My car won't start.
This may be related to a weak battery or a faulty starter relay. The starter relay directs power from the battery to the starter solenoid which then engages the starter when you turn the key. When this is not working...
Question
My 2007 Grand Caravan has hard detonation problems.
Hello. Engine detonation and power loss can be caused by a few different things. Keep in mind that engine detonation can quickly become a bigger issue if left unchecked, and in serious cases can even lead to engine damage. It...
Question
Crank no start
Hey there, thanks for asking about your 2002 Ford Crown Victoria. Burned wires can signify that there has likely been a short somewhere in the electrical system. Often times when this happens, it is quite easy for the car's computer...
Question
Clicking sound when trying to start the car
It sounds like you will need to have the starter checked. You'll need to check if the click is coming from the starter solenoid on the starter or the relay in the power relay box in the engine compartment. Also,...
Question
Car won't turn over
This may potentially be a faulty starter solenoid or relay depending on the symptoms. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity to the starter. When this fails, it may cause a...
Question
Car will not crank
This may potentially be related to a faulty starter relay. This is a unit that directs power from the battery to the starter solenoid which then engages the starter when you turn the key. When this is not working properly,...
Question
Brake lights do not work.
I don't have the wiring diagram for this vehicle handy, but one thing to check is the brake light switch. Hyundai actually issues a recall on these switches. I suggest you call the dealer with the VIN of your vehicle...
Question
Blower motor stopped working
If your blower doesn't work on ANY speed setting, then yes, the blower motor fuse or a relay is the likely problem. The relay is on the main fuse panel. It is also possible the motor has enough grit and...
Question
air suspension system stopped working.
It sounds like you may have a small leak somewhere, possibly one of the rear airbags. Aside from that, there is a relay behind one of the headlights that controls the air compressor. If you get power at the relay...
Question
Hello I'm trying to locate my fuel pump relay on my 1994 Toyota but I'm not finding it. It says it should be behind the glove box
The fuel pump relay is called the circuit opening relay and is under in front of the center console.
Question
Where is the battery saver relay located on a 98 GMC Yukon 4wd?
This vehicle is not equipped with a battery saver relay and interior lights are controlled by a lighting control module if equipped or operated manually.
Question
What does it mean when the MIL stays on after car if shut off?
You may have a sticking EFI relay in the main fuse box in the engine compartment. This relay if stuck on can keep power to the computer to turn on check engine light. Replace the relay and then retest. ...
Question
My windshield wipers won't turn off on my Cadillac CTS 2005.
The switch contacts are welded (stuck) shut OR the circuit is being powered due to a wiring fault or some sort of short. It is also possible that relay contacts in the wiper circuit are stuck on, regardless of switch...
Question
My ac clutch is not engaging, but there is no relay in the fuse box for the ac compressor
If a mechanic told you only that the compressor is not "engaging" that is essentially a useless diagnostic because it is too cryptic and too vague. The compressor in the system will only operate if the compressor clutch is engaged....

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