I got my Momo wheel in today and have a question about the wiring of the horn.

Since the battery will be diconnected before I remove the old wheel, I won't be able to test which of the two factory (orange) horn wires to tell which one is the hot one.

In their diagram it shows 2 options for wiring the horn

1. Shows two wires coming through the hub from steering column. One goes to the horn button tab and the other goes to the other tab on the horn button.

2. It shows one wire comming through the hub from the steering column. One wires goes to one of the tabs on the horn button and shows a small jumper wire that comes off the other horn tab and gets connected to the mounting plate on the backside of the wheel.


Any ideas which is the correct way? I would like to keep my horn so I don't have to yell at people

I'm not 100% sure there is two factory orange wires bound together or if just one. hard to tell from the pics I could find.

 

maybe this will help. there is a wiring diagram there but i dunno if it will be usefull for you

https://my350z.com/forum/body-interior-exterior-and-lighting-diy/77855-diy-for-steering-wheel-removal-and-steering-wheel-audio-control-unit-install.html

 

I read through that DIY before and doesn't show enough detail.

 

ahh.... well i tried
maybe anyone else whos done this might help ya.... id like to see the answer also.

 

Aren't most horns just wired at the button, that way when you press the button, it grounds it and connects the circuit. I'd say there is only one wire, but i haven't done this on the Z. The only reason to have 2 is if the hub isn't grounded, then the 2nd wire gets hooked up to somewhere in the hub and when the button gets pressed and touches the hub, it gets grounded and triggers the horn. But like i said, most steering wheels have one wire that gets connected to the moving part (horn button) and gets grounded when you press it.

 

If there turns out to be two horn wires my guess is that they both go to the horn button to complete a circuit when deprseed like you said..

 

Finally found a thread where somebody indicated that the airbag (yellow) has two wires going to it's plug. The horn (orange) wire also has two wires going into it's plug. The damn factory wires are shrinked wraped and couldn't tell how many wires were underneath the black shrink wrap stuff from any pics.

So I can only assume that both horn wires will clip onto the horn button and when button is pressed, it completes the circuit and whala, just how the airbag resistor works. On the other hand if those 2 wires under the shrink wrap are different colors, than there goes that theory.

The airbag must be the same exact thing, the resistor creates a dummy load, when connected in series (not sure if that's the correct term) with the two wires (one end of the resistor connects to one yellow wire, the other end of the resistor connects to the other yellow wire.

I did see a pic of the airbag resistor installed (trying to find it again errr) and it looked like they just shoved the resistor prongs into the plastic clip??? I think I will splice the resister prongs to the yellow wires instead. I want to make damn sure that air bag light never comes on, unless the resistor prongs actually have clips that mate with the plastic plug clips.

If this turns out to be true, it shouldn't matter which horn button tab I clip each orange wire to as long as they are the two tabs on the horn button.

Now I just have to figure out what the hell the plastic gray clip with the one black wire coming out of it, included with the kit is for. I already know the instructions are in japanese, so will be fun. Guess if I had to I can get my cousin to translate


If it blows up and smoke pours out, then I was wrong

I took electrinics in High School and even advanced electronics. I barely passed both.... Go figure

 

Is it just a grey wire with a clip on one end? I would guess they provide a grounding cable just in case the car horn grounds through the button. If you can scan the instructions we can try to decipher it for you, my college japanese class should be able to somewhat figure out what the black wire is for hehe...

 

LOL. I haven't gotten the hub or quick release in yet just the wheel, so I have nothing to scan. I'm trying to figure out as much as I can now, so I won't have to figure out Japanese later

Hopefully the pictures will be self explanitory

 

Here is a good pick of all the stuff in the kit. The thing with the blue wires is the resistor and does appear it just plugs into the yellow factory plug.

I think you might be right, They gray plug in the pic with the black wire must be a ground (black wires usually are). Not exactlly sure what goes to it. When I find the pic I've been looking for for the last 2hours, that will help.

 

This is the pic I was looking for, where it looks like the 2 clips/wires of the resistor just plug into the yellow clip.


Now why he has a resistor on the horn plug, I have no idea.

 

Ok now i think i mostly got it now.

That gray plug with the black wire with the kit, must replace the factory plug and is a general ground of some sort. It replaces the factory plug that is in this picture and is ground to the same metal tab thing a ma bob like the green wire is.

If there is only one wire that comes out of the 7 pin kit plug, the only reason i could see replacing the factory plug, would be if you have Cruise control, which would have more wires coming out of the 7 pin factory clip.


It's the same function as the green (ground) wire because it's located in the 3rd pin position like the factory green wire which isn't actually green because in that pic it's from a G not a Z.