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  1. #1
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    Default Turn On Headlights and the Horn Blows

    Long time lurker, first time poster.

    Do any body have a solution to this?

    It rained here overnight, and the car was parked nose down in the driveway all night. Started the car this morning with no issues, when I turned on the headlights about 5 seconds later i got a short horn burst, then full on horn. Needless to say the other residents in my subdivision were not happy with me at 5:30 am today. The only way to stop the horn was to turn off the headlight switch. Drove to work with no lights but had no other issues. Got to work, popped the hood, and removed the horn relay, now the lights come on just fine and the horn doesn't sound. Obviously this is a band-aid solution, at some point in time I'll need a horn and to fix the real problem. Does anybody know where I should begin to look to diagnose the problem? could it simply be a wiring issue or are there deeper issues here? I'm not afraid to jump into a repair, but I don't want to waste time chasing a ghost.

    Car is: 2007 Mazda 6 3.0L v6 Stock w/drop in 33w HID lights. 300,000KM (just rolled yesterday)
    Thanks.

  2. #2
    Working Class Hero GerryB's Avatar
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    Wow, that's bizarre. Hopefully someone will have an idea, but insure don't.

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  3. #3
    whiskey is my yoga Drizzoh's Avatar
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    There is a big white ground with 10 wires or so under the airbox. Not sure if that's the issue but I've heard of these cars doing a lot of weird things when that ground is loose or corroded. It's quick to check, i'd start there.

  4. #4
    Forum Overlord Stl's Avatar
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    Thats about simular issue i had and it only happens in winter. Horn will go off when i put blinker on or it will just do solid horn out of no where. So I just pull the relay off so it doesn't sound the horn anymore for few days

  5. #5
    Forum Overlord Stl's Avatar
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    I will need to find that ground to check

  6. #6
    No Net Persona, Just Me!! The Great NY's Avatar
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    this is strange indeed considering that the Horn and headlights arent on the same circuit. how much rain? was the car submerged?

  7. #7
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    Default

    Quote Originally Posted by Drizzoh View Post
    There is a big white ground with 10 wires or so under the airbox. Not sure if that's the issue but I've heard of these cars doing a lot of weird things when that ground is loose or corroded. It's quick to check, i'd start there.

    So As a follow up to the post, I tore the car apart this weekend and think I've solved the issue. here's what I did.
    • Remove Air Box and Intake Hose.
    • Disconect and Remove Battery
    • Disconnect Wiring Loom from Engine Fuse Box,
    • Remove All Relays and Fuses From Fuse Box
    • Clean battery terminals
    • Remove Paint & Clean Battery / Chassis Ground Point
    • Clean Visible Grounds in Engine Bay
    • Located White Common Ground Plug, Completely Desassemble, clean corrosion with wire brush ...rebuild
    • Clean Wiring Loom Connections and all relays with electrical contact cleaner
    • reassemble
    • Move HID Ballasts to lower point on chassis


    so far the lights operate and the horn does not sound and everything feels much better in the car.

    For the record... corroded grounds suck.

  8. #8
    Forum Overlord Stl's Avatar
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    Thats wassup, Thumbs up

  9. #9
    whiskey is my yoga Drizzoh's Avatar
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    Awesome job man! i figured it was something as simple as that, but seems like you took it a step further. Good deal.

 

 

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