Bad Relay Found In KIA Car (Pride)
This type of Korean cars are running millions in the world. The complaint was the car horn not functioning. I began my search in the web to find the diagram. The diagram made clear that the horn has 6 main components:
- Battery and
- The reference link for diagram or the horn circuit :
First, I tested the Horn, I connected the connector of horn directly with two wires to the poles of the battery of the car. A very loud voice indicate that the horn was good.
Next I tested the fuse of the circuit in fuse box with my own home made fuse tester and the fuse was checked to be good.
NOTE: Due to heavy current that the car battery produce (about 60 AMP) we cannot test the voltage by our conventional multimeters as this can damage the meter.
In order to make the car fuse tester, you need:
- 1 piece of wire length 50 cm no. 2
- A roof lamp of pride 12 volt. top and bottom of this lamp must be metallic for soldering proposes
- 1 wire clip
- A piece of transparent plastic pipe with the length of 10 centimeter as cover of the tester
- A medium size nail as probe of tester
How to use this tester
- Hook the wire clip to the body of the car this could be any good metallic part of the door(body of the car is negative side of the circuit)
- Touch the probe of the tester to each fuse if the lamp turns on this means the fuse is ok if not fuse is blown (each fuse has two side; negative side and positive. If the fuse is not blown, the lamp must light up for two sides otherwise the fuse is blown)
- Also with this tester, you can test the existence of voltages in all the circuits of the car.
The above photo shows that the fuse is ok and no problem in this part of the circuit and also the battery is good. So far all the components according to the circuit are intact and the only thing that is not tested yet is the relay. You can visit the video below on how to use the test light:
Next step I took out the relay (the location of relay is left side of dashboard behind the fuse box).
And conect two wire of power DC supply to the bobine connectors of relay with 12 V DC. If the relay were good the relay must click. No sound from relay means the relay is not working and this relay was silent when the power is applied. I have to mention that two other connectors of relay are switch connectors.
By replacing the bad relay with a good one, the horn of car can be heard loud and clear once it was activated by pressing the center part of the steering. The cost of this repair was just about USD2.00 only. If you want to know more about automobile electronics repair you can click HERE to check out the website.
Note: The horn circuit is belong to the cars with no ECU.
This article was prepared for you by Mr Beh from Iran.
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September 7, 2015 at 4:55 pm
Good fix. Love the homemade test light. Just wanted to mention that I've used many many multimeters, both digital and analog on lots of different vehicles and never had a single problem. Yes a car battery can supply a large amount of current, but there are very few systems that actually draw that many amps. Mainly the starting and illumination systems. And on ecu equipped cars you need to be careful with a test light because not all ecu controlled systems are 12 volts.
September 8, 2015 at 9:58 am
ok i will do this also with multi and thanks
September 7, 2015 at 5:56 pm
Good job, Beh. It's nice to see you are still doing well.
September 8, 2015 at 9:42 am
Robert thanks .car repair is new for me and not have experience but i will
September 7, 2015 at 6:25 pm
Beh, Thanks for sharing your experience.
September 8, 2015 at 9:45 am
Yogesh you are welcome
September 7, 2015 at 7:31 pm
Thanks for shainr Beh. good info about the tester of fuse of car. Thanks my friend
September 8, 2015 at 9:46 am
Zed you are welcome
September 7, 2015 at 8:44 pm
Good job. The way of testing circuit and made own tester are good. Thanks for sharing this article.
September 8, 2015 at 9:48 am
Gurpreet you are welcome
September 7, 2015 at 10:26 pm
" Due to heavy current that the car battery produce (about 60 AMP) we cannot test the voltage by our conventional multimeters as this can damage the meter"-that's not right for voltage ,that's right for current
September 8, 2015 at 9:51 am
ok i will try by multi will tell you about my experience and thanks .car repair is new for me
September 7, 2015 at 10:58 pm
Relays for Korean Vehicles (KIA and Hyundai) can be dodgy. My experience is that sometimes testing equipment does not always reveal the problem in relays. I've had a relay that clicked when the voltage was applied. The readings were identical to those of a new relay. Yet the relay was bad (not working) Replacing it with a new relay resolved the problem.
September 8, 2015 at 9:55 am
ok i will try by my multi and i will tell you about my experience and thanks
September 8, 2015 at 10:18 am
chines spare parts are all around with bad qualities this is the price of the chines research and development that the people of the world are paying this
September 7, 2015 at 11:22 pm
September 8, 2015 at 10:04 am
you are welcome
September 7, 2015 at 11:52 pm
Good repair Beh. Keep up.
September 8, 2015 at 10:03 am
you are welcome
September 8, 2015 at 2:42 am
Been there and done that and yes you can test the voltage of your car with a meter. Good repair and thanks for sharing
September 8, 2015 at 10:01 am
ok i will try to test the voltages of car with multi and thanks
September 15, 2015 at 3:28 am
Mr. Beh, thanks to share your experience with as, I appreciate your article and hope you write more.
I will suggest you to build a simple LED probe. Put a 1k resistor in series with the LED and replace your bulb in your fuse tester with that LED + resistor.
With this equipment you can check the fuses and all the stuff around the car, even the ECU pins too, without to worry to blow-up some circuit.
And remember what others say about the AMPERAGE and VOLTAGE!!!
Please, take care with this two thinks, this can harm and kill!
If you have any noun or confusion about this two thinks please, please let as know and we will help to solve and crystallize your knowledge.
September 20, 2015 at 11:03 am
you are most welcome and thank you so much of your kind words.
yes it is very good suggestion to use LED in this project but i do not know what kind of LED and resistor must be installed in the circuit(voltage of led and resistance of resistor) i will thankful of you if you help me to build this one and i am sure this will be more useful for all .
i have to mention that also i always enjoyed of your very clear and useful articles
September 24, 2015 at 5:46 pm
You can also see my article where I make a tester that has 2 LED's.
September 23, 2015 at 6:58 pm
Hi Beh, you can use a standard led diode with a 1k resistor in series.
With this you have covered the input voltage from 5V to over 15V.
the led will probably lit smaller on a 5V source but it's ok.