Put a voltage(12V dc) across the coil terminals and see if it clicks. At the same time put a test light (battery operated) across the switched terminals and see if the light lights up. If if does, the relay is good. If it clicks and the light doesn't light up, the contacts are band. If it doesn't click, the coil is bad.
OR GO to any auto parts store, buy a new relay( about $2.00) and plug it in.
Typically, that problem would only be caused by a faulty horn relay or a damaged horn contact switch inside the steering column. A frayed wire that rubs on a metal part of the vehicle. Since the relay is the easiest part to test, remove the relay and replace it with a similar relay FOR TEST PURPOSES ONLY. If the horn works properly with a replacement relay, put the relay you used for testing back and purchase a new horn relay. If the test relay left the horn ON, you probably have a damaged horn contact switch, in which you will need to replace the faulty component.
Type your answer here... you don't... there is no way to test a faulty relay. Just buy a new relay and install it. If the problem is fixed, then the old relay was bad. If the problem still exists with the new relay installed, then the old relay is still good. Most auto parts stores are good for returning products, even electrical parts.
Blown bulbs. Blown fuse. Faulty wiring. Faulty relay. Faulty switch.
Faulty Flasher Relay or incorrect flasher relay.
because your fans arent working, which could be a faulty relay, fuse or faulty thermoswitch. on mine it was the relay which is expensive for a relay. if that isn't the problem try changing your thermostat.
A faulty fan motor, A faulty fan motor relay, A faulty coolant temp sensor, A faulty ECM, (most unlikely),
If the test switch is faulty then there is no convenient way to determine if the GFCI is functioning, and technically, if the test switch is faulty, then as it is a part of the GFCI, the GFCI is faulty and should be replaced.
i believe it has a faulty headlight relay.
Could be a Faulty relay.
There are really only three possible causes:Whatever controls and triggers it is low on voltage. A poor ground will cause this as well and look like low voltage feed.The triggering device (engine computer is faulty or has a input fault causing it to chatter.The relay is faulty. These are generally cheap and easy to change, with the added benefit on most cars of being the same as the horn relay and you can test swap.
it could be that one or all of your sensors are faulty, it could be the abs relay is faulty or it could be the abs pump that is faulty ( or it could also be a fuse )
Could be a faulty fan motor, a faulty fan motor relay, a faulty fan motor temp switch or a blown fan motor fuse.