G37 Coupe Horn Mystery

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G37 Coupe Horn Mystery

Postby nshoemaker » Wed Mar 28, 2018 7:39 am

Hi guys. Couple weeks ago and noticed my horn wasn't working read through every thread I could find on here and other forums . I read the service manual wire diagrams. The horns relays all work. I originally thought it was the clockspring so I replaced that and no luck. I was able to find the horn wire coming out the bottom of the steering column. I get continuity between the yellow wire that connects to the horn switch frame and a light bluish wire that's in a purple wire harness under the driver's Dash but one thing I can't figure out is the steering column doesn't seem to be grounded. I don't get continuity from the steering wheel frame/shaft/nut to the ground on the body at the kick panel. Should I? From reading all the aftermarket wheel installs it seemed as though everyone was just grounding their switch to the wheel which made me think that I should have ground right there at the shaft and nut...

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Re: G37 Coupe Horn Mystery

Postby audtatious » Wed Mar 28, 2018 8:00 am

Have you tested the horn itself by simply providing power/ground? Do you still have electronic tilt capabilities? I'd assume if you were having a ground issue at the column it would effect that as well.

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Re: G37 Coupe Horn Mystery

Postby telcoman » Fri Mar 30, 2018 7:07 am

nshoemaker wrote:
Wed Mar 28, 2018 7:39 am
. I originally thought it was the clockspring so I replaced that and no luck.
Never throw parts without proving the root cause of the problem.
You never actually removed and tested the horn by applying 12v and ground?

Follow the troubleshooting steps in the FSM


See page HRN -02

Since you mentioned both horn relays work it is entirely possible you have defective horns. Perhaps they got wet? You never tested them?
Did you ever remove the fiberboard shroud from underneath the vehicle and leave it off?


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Re: G37 Coupe Horn Mystery

Postby amc49 » Sat Mar 31, 2018 3:16 am

Not only that but a great number of horns that simply do not work when 12v is added can be opened up to be working for years again in minutes, they are super simple inside and easy to fix. Can't count the ones I've done.

They can be wired either of two ways, one grounding at or near your wheel switch and the other way is grounded at horn location, so automatic steering column grounding is NOT a given there. Some don't even use relays either.

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