2008 Lexus SC430 Horn not working

Reply Subscribe

Thread Tools

Search this Thread

Apr 27, 2018 | 06:43 AM

johndo004

Thread Starter

Driver School Candidate

Joined: May 2017

Posts: 19

Likes: 0

From: CA

2008 Lexus SC430 Horn not working

What is wrong with my horn on 2008 Lexus SC430? The weirdest thing is that every now and then, the horn will not work on straight steering position and it's work when I turn a steering wheels on 45 degree angle.

I've researched, it is the fuse, relay or spiral cable went bad?

Please help!!! Does anyone know what is wrong? Thank you...

Last edited by johndo004; Apr 27, 2018 at 06:50 AM.

Apr 27, 2018 | 08:07 AM

GmanSC

Pole Position

Joined: Oct 2015

Posts: 3,114

Likes: 617

From: CA

Definitely not the fuse nor the relay. The only thing left is your horn switch and/or your harness. From your description, I think it’s your harness. Others can chime in.

Apr 27, 2018 | 08:34 AM

VVTiBob

Pole Position

Joined: Dec 2009

Posts: 3,135

Likes: 276

From: CA - San Diego

From your description it’s the spiral cable assembly in the steering column. It’s a simple, but tedious repair. Here’s a you tube video:

If you take this on, battery disconnection is ABSOLUTELY NECESSARY! Always be careful around any yellow connectors and cables, they are associated with the airbag systems.

Apr 28, 2018 | 12:46 AM

johndo004

Thread Starter

Driver School Candidate

Joined: May 2017

Posts: 19

Likes: 0

From: CA

Thank you GmanSC and VVtiBob....

Jan 8, 2025 | 08:33 PM

Sharpgt

10th Gear

Joined: Oct 2024

Posts: 10

Likes: 10

I've been chasing an inoperative Horn in my 2006 SC430. I've replaced the clock spring (radio controls work) and the airbag, as well as the fuse. There is a relay somewhere I can find the part # but not where or which relay it is. Anyone know the location? Thank you

Jan 9, 2025 | 09:05 AM

Lexicon1

Advanced

Joined: Dec 2004

Posts: 728

Likes: 175

From: West Coast

Tbd

Quote:

Originally Posted by Sharpgt

I purchased but have not installed the spiral cable, its an OEM part and more expensive than the "generic" versions that are available.
I also previously attached a "ground" extra cable from the top of the telescoping steering wheel assembly to a known ground....that did not address the intermittant horn issue.....
I have not installed the spiral cable yet....
Sorry I cant help w the relay question....I thought doing the spirac cable would be a slam dunk repair , now I am not so sure....
Let us know what you find...I also have a 2006 SC430

Jan 9, 2025 | 12:07 PM

DshngDaryl

Pole Position

Joined: May 2016

Posts: 3,116

Likes: 659

From: AZ

Quote:

Originally Posted by Sharpgt

Based on this website, there is not a horn relay. Just a horn fuse.
https://fuse-box.info/lexus/lexus-sc...001-2010-fuses

I would check the actual Horn on your car. Get a test light and attach it to the horn wires. When you honk the horn, the light should light up.

Here is a video from good 'ol scotty that covers the different causes