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Discussion summary
YOUR RESEARCHHelp! My horn works with car off and NOT on?
Leading reported evidence
Replace dash
Performed · outcome unconfirmed
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0
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1
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Performed · outcome unconfirmed
This happened to a Boxster owner after he replaced the dash.
Leading evidence: 'Replace dash' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check ground wires' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Pull the air bag and double check both ground wires.
Check relays, make sure theyre in the sockets securely
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Suggestion
check the relays, make sure theyre in the sockets securely
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Suggestion · Original poster
I dont use my horn very often, I just hope it works with my alarm!
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This happened to a Boxster owner after he replaced the dash.
http://www.renntech.org/forums/index...=14923&hl=horn
Not the electrical guy, but there are 2 wires for the horn and you really cannot hook them up wrong because they are different lengths. One wire goes to the steering wheel and the other goes to the horn plate. These 2 wires create a ground so even if you could reverse them it would not matter.
Thanks for the link.
It looks like no solution was found on his end yet either. Im going to dive deeper today so If anyone have any ideas, PLEASE let me know!
This is the strangest thing I've seen
put the original wheel back on, if it works, then its the 3 spoke wheel. If it doesnt. then its an elec issue... check the relays, make sure theyre in the sockets securely
It doesnt make sense though. The horn BEEPS when the car is off? Im not exactly sure how the horn system works but im assuming that when you press the pad, it completes a circuit, therefor sending power to the horn....
The horn is connected directly to power all the time(not switched power) so that it can work when the car is off AND on.
Where in the circuit of the horn system could there be a mishap that causes the horn system to work off of SWITCHED power rather than CONSTANT power?
-Keith
Just curious...is the 3 spoke a factory unit or a 3rd party unit? If 3rd party, did it have any speical requirements for the horn to function?
Like you this doesn't make any sense as it shouldn't matter if the car is on or off, it should work at all times.
I know American cars work that way.
Bad grounds cause incorrect travel of electricity. They always take the shortest path so maybe when the key is on, somehow, power is grounding through another circuit? **shrug**
I feel for you, these things can cause headaches.
That's just odd. Just spent a few minutes with the schematics, and I can't see how that happens, because:
- Horn relay contacts and coil are supplied with constant-on fused power via 25A fuse #3 in fuse holder B.
- Horn button simply grounds the other side of the relay coil, pulling in the contacts and supplying horns with the fused power.
It doesn't get much more simple than that. The wheel isn't by chance a tiptronic wheel, is it?
No it's not a tiptronic...
It just makes no sense. You either have the circuit grounded or you don't. It has constant power....
Since you looked at the circuit, where does the ignition switch come into play AT ALL?
Since the airbag is right there, is there anythign related to that?
ok... the horn relay is energized when the horn button is pressed and ignition is off... this is confirmed by the horn beep.
if you press the horn button while similtanously turning the ignition to on position... the horn shuts off.
to me logically those two circuits are somewhat shared... somehow. hence my suggestion to take it apart and starting from scratch... such as the original wheel, just going through the troubleshooting motion
To my knowledge they shouldn't be attached...This is my confusion...
The horn is not connected to a variable power source, it is direct with the battery...
Somewhere, somehow, there has to be a wire crossed or something it seems. However, if when the ignition is switched, power is given and if it is touching the horn pad, when the horn is grounded, it would still ground the circuit and potentially other circuits switched to the ignition?
I spoke to 2 mechanics and they had never seen this. To make a long story short. I said both wires were ground wires for the horn. Wrong. The short wire that goes to the steering wheel is the ground for the air bag. The long wire to the horn plate is the horn ground. We know the horn plate wire is hooked up properly because your horn works.
One of the mechanics said to make sure the connector for the air bag ground wire is properly seated. That is his wild guess. One mechanic thought maybe a bad ignition switch, but the other mechanic did not think so.
Pull the air bag and double check both ground wires. Pull them off and put them back on.
I can see how it might happen if you don't have horn contact 1 connected to the brown wire going to the ground point (GP). In that case, maybe you have a floating ground from the airbag or something with the key off. And then the ground lifts when the key goes on.
From the schematics for a 1999:
Well sure. I was just confused about what the alarm horn had to do with the thread. And then I read the post above where the OP asked about his alarm. Sometimes, reading really is fundamental!
