Horn doesnt work and key fob does not work (no panick alarm either)

2006 CHEVROLET IMPALA
120,000 MILES • 3.4L • 6 CYL • FWD • AUTOMATIC
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SORA ESTHER GWENDOLYN WEIMER
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Horn Fuse is good (switched it with a known good one).
Horn Relay is good (switched it with a known good one).
When I press the center of the steering wheel, I can hear the relay click, so assume the switch is good?
Removed horns and tested them separate from the horn system and they both work.
Had the cable harness that plugs into the horn tested and it has twelve Volts output. Connections are clean.
Any idea what else could be wrong that I can try?
Aug 2, 2016 at 5:46 PM
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SATURNTECH9
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So you have twelve volts on the horn connector across the two terminals when pressing the horn button?
Aug 2, 2016 at 7:46 PM
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SORA ESTHER GWENDOLYN WEIMER
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Thank you for your reply!

I went to a mechanic and he measured it while I pressed the horn button and said it looked good, but I did not see the voltage myself.
Aug 3, 2016 at 5:38 AM
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SATURNTECH9
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Well, if you have power and ground to the horn then a good horn should work. If you only have the power side the horn and not the ground side then there is a problem with the circuit. If you have a ground but no power then you that is a problem. So we need to figure out which one or both we have.
Aug 3, 2016 at 7:21 AM
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SORA ESTHER GWENDOLYN WEIMER
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I see what you are saying. Maybe i can connect the cable harness power to horn with a wire and connect another wire to horn from another ground source and vice versa to see if that solve it.
I may not get to this today, so will let you know what I find out.
Thank you!
Aug 3, 2016 at 9:18 AM
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SATURNTECH9
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Your welcome we need to see what is missing so we can see if it is the horn or a circuit issue.
Aug 3, 2016 at 10:44 AM
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SORA ESTHER GWENDOLYN WEIMER
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The connector on the cable harness has very small slots, so I inserted stranded wire in the two slots to test it. I have a 12V LED and when I attached it and pushed the horn button it lights up. When I touched the stranded wire to the horn and horn button pressed, it does not honk. I checked the horn again (wires directly from battery) and it works great.
Aug 4, 2016 at 11:12 AM
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RIVERMIKERAT
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Sounds like a bad ground to me. The LED doesn't require as much current flow to light up as the horn needs to sound.
Aug 4, 2016 at 12:29 PM
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SORA ESTHER GWENDOLYN WEIMER
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One test I did was ran the hot (black wire) from the cable harness to the horn, but instead of using the ground (green wire), I connected a separate wire from a screw on the chassis to the horn. Would this have confirmed if the ground was bad?
Aug 4, 2016 at 12:44 PM
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RIVERMIKERAT
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If the screw on the chassis was a good ground, it should have.
Aug 4, 2016 at 12:54 PM
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SORA ESTHER GWENDOLYN WEIMER
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I previously hooked one end of the LED to positive red terminal on battery and the other end touched the screw and it lit up.
Aug 5, 2016 at 3:51 AM
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RIVERMIKERAT
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Like I said earlier, an LED doesn't require that much current to light up. A horn requires a good deal more current to honk.
Aug 5, 2016 at 5:33 AM
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SATURNTECH9
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Check out the picture I posted it shows the ground for the horn and it's location.I would say there is probably crossing where the ground is mounted .That would explain the led lights up but the horn doesn't work.
Image (Click to enlarge)
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Aug 5, 2016 at 12:06 PM
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SATURNTECH9
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So what did you find?
Aug 6, 2016 at 7:19 PM