Question about 2007 Toyota Camry

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2004 Camry horn is not working, horn, fuse & relay is ok. Got 12V "IN" Missing (-) from steering column harness to relay. Keyless entry will not turn horn either but will turn on lights and flashers with panic button. Rest of the functions work fine. Is there relay between steering column harness and horn relay? if yes where is it located? Other suggestions?

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  • adam818 Dec 27, 2008

    horn, fuse & relay is ok. Got 12V "IN", when jumped relay coil horn works

  • adam818 Dec 27, 2008

    actually what I meant was that I've powered relay's coil directly from battery and that made horn sound


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How about ground. The horn must receive 12 volts and ground to work. If its getting both, change the horn.

Posted on Dec 27, 2008

  • Peter Fadoulakis
    Peter Fadoulakis Dec 27, 2008

    It doesn't sound like the relay is good. It sounds like voltage is entering the relay but not leaving it. Look at it this way, you said if you jump the relay the horn works. Well, that tells me the relay is bad. Wouldn'y you agree?

  • Peter Fadoulakis
    Peter Fadoulakis Dec 27, 2008

    Thanks for better explaining the problem. The circuit doesn’t have another relay. The relay that you jumped to the battery is the one and only relay. The ground for the relay comes from the “BCM”. Body Control Module. Check the ground connection coming from the “BCM” to the relay. Make sure it’s clean, tight, and corrosion free. Make sure no pins are pushed back in the connector. Make sure the “BCM” is getting both power and ground. If you have the necessary scanner and enough expertise you can scan the “BCM” for any error codes. Confirm there are no blown fuses, fusible links, or circuit breakers. If you have ground at the “BCM” but none at the relay, troubleshoot for an open circuit. Again, expertise and the necessary diagnostic tools are necessary. As a last resort you can leave the open OEM ground wire and just run another ground out to the relay. You can only do this method with broken ground wires. Never leave a broken wire that carries voltage open in a wire harness, and run another voltage wire.

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