Question about Ford F-150

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My 01 ford f150 has been acting like it's possessed. When it's cold out, so overnight, the horn sounds, it unlocks itself, and the headlights come on. I have followed the advice of two experts on here, as well as what the dealership said, and the problem is still unresolved. I removed the batteries from my key fob, which did not solve the problem. I had the wireless control module replaced, which also did not solve the problem. The dealership said they thought that the "super heavy duty alarm system" that was on it was the problem, so I had that disabled as well. Alas, the horn going off at 2 am and the truck unlocking itself is still occurring. PLEASE help me, this is becoming a very expensive problem.

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  • Tim McFarlin Nov 13, 2009

    it did it at the dealership as well, when there was no similar source around.

  • Tim McFarlin Nov 13, 2009

    also, it does it while my wife is on her way to work in it, with no key fob around.

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  • Ford Master
  • 6,826 Answers

There most likely is a out side sourse causing the problem,another frenquincey ,If possible drive the vehicle to another location before that ime in the morning,and see if it still does this.

Posted on Nov 13, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    If the horn relay.or horn button,wiring,is shorting,it would possibley back feed to cause the camotion,check the horn relay,and button,then the wiring,just tying to help here,but it does sound like a back feed from tha horn circuit.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2009

    And sense it is a back feed,removing the fuse to the horn,or unpluging the circuit may not help,sense the shorted area is unknown.

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