Showing articles & questions for topic
relays

Related articles

How Long Does an Automatic Shutdown Relay Last?
When you start your car, a number of things happen. The fuel pump delivers gas through the fuel lines to the fuel injectors, and the battery delivers voltage to the ignition...
How Long Does a Condenser Fan Relay Last?
The condenser fan relay allows the cooling fan to pull air through the radiator and the condenser to cool the vehicle. This part is connected to the condenser fan and is...
How Long Does an ECM-Power Relay Last?
As technology continues to advance and move forward, so does the way our vehicles operate and run. It seems more and more parts rely on computers and sensors than ever before. The...
How Long Does a Fog Light Relay Last?
All vehicles come equipped with headlights, and some vehicles offer you more in terms of lighting. Fog lights are a popular option with drivers as they are perfect for foggy conditions...
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 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 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 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.
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 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 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 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.
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 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 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 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 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 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.

Related questions

Question
What could be the problem? My GTI 5 is showing these codes after diagnosing low pressure regulation, fuel pump circuit.
Hi there. If you are getting codes for the fuel pump circuit, then there could be a problem with the fuel pump, fuel pump relay, or the electrical wiring. First check the fuel pump relay and see if the relay...
Question
Is there a fuel pump relay reset switch? Still got no power after changing the pump and relay. There is no engine light.
Hi there. There is no fuel pump relay reset switch, just a fuse. If the fuel pump is not working, first check the fuel pump fuse to see if its blown. If the fuse is good, then check the power...
Question
My 2010 kia blower fan stopped working but was fine last week. This occurred a few times in past. Works fine then stops blowing ag
The blower switch and the plug connection on the back of the switch, as well as a faulty blower motor are likely, too. I would check the blower motor first as you can easily power the motor directly to see...
Question
location of starter relay
Hi there. I think you'll find a 2003 Mitsubishi Galant service and review manual to be very helpful in locating your starter relay. It will also give you step-by-step instructions for removing and replacing this component as well if that's...
Question
Bad ignition switch or main relay?
Many of the 1998 Accords were recalled by Honda for ignition switch and interlock defects. In your circumstance, the first thing to do is confirm whether applicable recalls affecting your vehicle were in fact completed, by you or any prior...
Question
ASD relay not activating
Hello. If you require an accurate wiring diagram you will be able to find one in the vehicle's service manual, or a quality repair manual. You may also be able to acquire the diagrams through a dealership or shop, or...
Question
Starts then stalls.
Hi there. Check the fuel pump relay and see if its working. If the fuel pump relay is getting hot, it will cut off and causing the fuel pump to shut off when the engine is running. This will cause...
Question
Van starts but stalls very quickly
Hi there. Check the fuel pump relay and see if it's clicking when the key is turned to the 'ON' position. If the relay is not clicking, then remove the relay and check for power to the relay base on...
Question
Caravan won't run when I hit the gas pedal.
Hi there. Check for fuel pressure on the fuel rail with the engine running. If the fuel pressure is at 50 psi or higher, then the fuel pump is working. If the fuel pressure is low, then the fuel pump...
Question
1994 GMC Sonoma not getting power to fuel pump
The problem is somewhere in the fuel pump relay control circuit. There are five relay terminals: battery power, ignition power (controlled by the ECM), ground, output to the pump and connection to the fuel pump prime connector. What the prime...
Question
engine full of gas
Hi there. The issue is the fuel pump relay is malfunctioning and causing the fuel pump to pump to much when it is not demanded. The knocking noise is the fuel going into the cylinders and hydrolocking the cylinders. I...
Question
Engine has spark and fuel but not starting.
Hi there. Check the fuel pump to see if its humming when you turn on the ignition. If the pump is not humming, then check the fuel pump relay and see if the relay is clicking on or not. If...
Question
My truck decelerated from 65mph on a flat surface without any warning.
First check for any fuel in the fuel tank. If there is fuel in the fuel tank, then turn on the key and listen for the fuel pump to hum. If there is not humming sound, then check the fuel...
Question
no indicator light comes on when I turn the key on.
Check the fuses in the cab, flasher units and relays in the cab, and for any loose ground wiring under the dashboard that could lead up to the lights assembly. A fuse, flasher, relay, or a loose ground wire will...
Question
What's causing my car not to start?
If the engine was running fine before and now the engine is not wanting to start after putting a new battery in and programming the keys, then there could be an issue with the fuel pump circuit. Check the fuses...
Question
Horn doesn't work when I push on the steering wheel but when locking car it does what would cause this problem?
Hi there - your symptoms describe a failure of the horn switch itself. The fact that the horn works when the security system is armed (when locking the vehicle) indicate that the horn and the wiring to it work just...
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
Cooling system aux fans not working 2006 VW Jetta
Hello - in addition to the coolant temp sensor that triggers the cooling fan operation (so does the AC switch on most cars), the fans utilize one or more relays that route the power to the fan motor itself. Since...
Question
Keeps throwing main fuel pump circuit code.
Check the fuel pump relay and see if its getting hot. A faulty fuel pump relay will throw a fuel pump circuit code if the relay gets too hot. If there is a code for the camshaft actuator, then there...
Question
MASTER RELAY switch
Hello. There is a large (by comparison to other vehicle relays) relay under the dashboard next to where the dash curves under and meets where you pedals tie in. You will have to remove its mounting screws and unplug the...

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Get a quote

Post a question and get free advice from our certified mechanics.


Ask a question