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Horn quit on 06 430sc

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This appears to be a common problem.  It is often the cable in the steering wheel cover.  Anyone else have experience with a horn that does not work?  The relay appears to be good as it is the same circuit as the light switch.  The lights work fine.  Could be the horns themselves. 

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It's doubtful that both horns would fail at the same time but it would be easy to find out with a simple 12V test light.  There are several potential causes.  The horn on the 2000 LS400 I used to have started barely working if at all when something inside the horn pad/air bag assembly broke.  An indie repair shop installed a salvaged horn pad / airbag assembly for around $800 which was great since the new part was over $2,000.

Or it could be a defective spiral cable in the steering wheel.  The indie shop that fixed the horn problem in my 2000 LS diagnosed the problem in only a few minutes but the mechanic was a former lexus dealer mechanic.

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