LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Horns ONLY work when the key is OUT of the ignition

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Old 06-22-15, 08:38 AM
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LsG86
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Default Horns ONLY work when the key is OUT of the ignition

I did try searching first before post this. I have 97 Ls and I need to pass inspection, I have no check engine lights but the horns only work with the car off and the key out of the ignition. Here in Texas apparently if your horns don't work they won't even touch the car. The horns I have on the car are brand new universal T-series from RockAuto. They work just fine when the car is off with the key out. I check the fuses under steering column and all seem fine, the 7.5a mini fuse for "sec horn" under the hood is fine as well. I can replace the main horn relay/fuse and see what happens. I plan to get it from AutoZone.

This is a real , I finally got rid of the p0420/430 and p0441 codes to pass inspection and now this.
Any advice is GREATLY APPRECIATED. Thanks
Old 06-22-15, 11:31 AM
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LsG86
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Okay I replaced the horn relay with one from AZ and no luck. Horn will only work with the car off and key out of ignition. My cruise control works and I have no air bad light lit so I don't think it's the harness inside the steering wheel column. Idk might have a shop look at it.

Update 6/23/15: Well I read a few posts about clock spring or wiring harness under horn cover, I believe this part might need replacing. If I do decide to replace this I will update this post with the results.

Last edited by LsG86; 06-23-15 at 04:24 AM.
Old 06-23-15, 06:49 PM
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sha4000
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That clock spring is usually the culprit. My horn stopped working in the winter when the temps were really low but as soon as it warmed up some it started working again. This tells me it was temperature related.
Old 06-24-15, 01:39 PM
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YoshiMan
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Does it have something to do with the telescope/tilt position? have you tried fiddling with that?
Old 06-26-15, 05:14 PM
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LsG86
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Originally Posted by YoshiMan
Does it have something to do with the telescope/tilt position? have you tried fiddling with that?
I don't know. My telescope/tilt position works just fine. I really believe it's the clock spring/ harness under the horn cover.
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