turn signal (blinker) wiring diagrams please?

Hello,

It sounds like the flasher has gone out which is common. To be sure here are the blinker wiring diagrams and the flasher location below and a guide to help check for power to see where you loose it:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

This guide can help as well

https://www.2carpros.com/articles/turn-signals-not-working-blinker

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Hello Ken,

Thanks for digging out the wiring diagram for me.

I just used the method of elimination and found that the flasher relay was indeed bad and replaced it and now the signals work fine.
Here's how I worked it out with few points that I noticed:
1) If the fuse blows then the power to both sides will be interrupted but in my case right side was working fine.
2) If it was the turn switch then the hazard lights button should have both sides flash but in my case it only made the right side light come on.
3) If the bulb blows then the light should flash faster but in my case it didn't work at all.

So, flasher relay was my prime suspect.

Nice work, we are here to help, please use 2CarPros anytime.

My hazard lights still work though. I can't find a fuse for the turn signals. but i have replaced the relay, both the turn signal switch and the combination switch.

Hello,

By relay do you mean the turn signal flasher? because that is what controls the blinkers. Here is a turn signal wiring diagram so you can see how the system works and the flasher location as well. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Yes sir, the turn signal flasher.

Do you have power at fuse #7 and 21?

Here is a guide and the fuse locations:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what happens.

Yes, there is power to those two fuses.

Then is looks like the MICU is the problem which is built into the fuse panel. Here is the location. Check out the diagrams (below). Please let us know what happens.

Would you know where to buy this at?

Hi,

This part is built into the under dash fuse panel. Unfortunately, this may be a dealer only option or a salvage yard. I checked a few of the major parts sites and they don't offer it. The reason is, it is not a common part so they won't sell a lot of them which means they won't make much money off them.

Sorry to not have a better answer for you.

I replaced the MICU, but now the left blinker won’t stop blinking and the right side still isn’t blinking.

Okay. I am just trying to get caught up with your issue since Ken is out this week. Before you put the MICU in neither blinker worked but the flashers did? Then you put this in and now the left blinker continues to blink and the right does nothing?

Yes, that’s correct.

Okay. Where did you get the part from? Was it new or a used part? Basically, we are making progress so I am going to assume that MICU is defective. Clearly there could be other issues like a loose connection but whatever it is, you touched the problem when you replaced that part. When nothing works, you replace one part, and it changes but may not fix the issue, then you are dancing around it.

Unless you didn't get a connector in or have a loose wire in a connector, the MICU you got has a different issue then the one you took out.

I got it from a place with genuine Honda parts. And it was a new part.

Okay, then we can assume it is not the part at this point but that doesn't change the fact that when this part was changed the issue changed so that means we are on the right path.

Before we condemn the part we need to check terminal tension of the terminals and make sure none of the wires pull out the back of the connectors.

Here is a video of someone showing how to test the tension on a terminal. Clearly the application is different and the type of terminal is not the same but the only thing you need to follow is the process he is using by getting another male terminal and making sure there is tension when putting it in the female connector. In you application, if you find any that have little or no tension then you will need to replace the terminal/harness because it is very difficult to tighten these terminals. It can be done but if not done correctly you will damage them and they will no longer fit.

If they all check out, then I would replace that part again. They should warranty it or in some cases, they can bench test it for you free of charge. It depends on the facility that you got it from but that will determine if the part is the issue or a connection on the vehicle.

https://youtu.be/fCy_6tbipHU

(Coupe model) When headlights on blinker does not work. When headlights off blinker works until I press on the brakes and when I press the brakes the low beams turn on in place of the blinker. Hazard lights as well stop working when I press the brakes or have my headlights on.

Hello,

It sounds to me like you have got some wires that shorting together, probably coming from the driver's side under dash fuse box. I have included a diagram of the fuse box and wiring diagrams in the diagrams below. Please check it out and get back to us with what you find out.

Thanks,
Alex
2CarPros

One more question. Does this part need to be programmed?

No. There is no programming for this as it is basically just a fuse box.

I noticed that when my headlights are on, my right turn signal goes slow. When my headlights are off, they go fast. I just tried changing the bulb and that didn't do anything. What else could this be?

It sounds like you either have a bad ground or low circuit voltage.

I would test your battery ground to the motor, frame and body and then test your lighting ground. You should read 0.04 ohms at each location.
The ground locations are noted in the diagram below. There are 4 in total.

Also test the voltage at the battery while running. This should be around 14.5 volts. If it reads 13 or less your voltage regulator had failed.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I would do an alternator check here is a guide to help you.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Check out the diagrams (Below). Please run this test and get back to us.

Rich

Thank you for answering, but do you know if this is something that AutoZone can check? because I don't have a clue as to what you're talking about (no offense to you).

That's okay. No they will not check this. If you like I can explain how to do it and you will need to buy a multi-meter for about $25.00. If not a shop would need to test this.

Rich

My son has a voltage checker (if that's what you're talking about). I just really need a step by step guide. I appreciate that.

Hi,

It could be the turn signal flasher relay contacts are wearing and causing resistance this will slow down the flashing when the system takes on more load like turning on the head lamps. Check all the exterior lights be sure they good and bright like they should be a blown bulb or poorly lite bulb will indicate an electrical problem in the power or ground circuit. I'm attaching repair guides and turn signal flasher relay location below. Let us know if you need more information for this problem and we will get for you.

https://www.2carpros.com/articles/turn-signals-not-working-blinker

Thank you

I understand where the flasher relay is, but now how do I test it? Can I do it with a test light that I use on my fuses? If so, how?

If the alternator tests okay I would try replacing the flasher, it would be difficult to test the flasher.

I just called up AutoZone to see if they have the flasher relay to my car. The guy asked me if I tried taking the relay out and see if my signal works fine. He said that if it works perfectly, that would prove that it's the relay. He told me that the relay is in the car basically for the hazards. Is all of this true?

No it isn't. The power for the bulbs goes through the flasher. If you unplug it they wont work at all.