2001 Toyota Sequoia horn works sometimes. I changed the fuse. Is it possible that the relay is bad? How would I know?
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Welcome to Motor Vehicle Maintenance & Repair!– Pᴀᴜʟsᴛᴇʀ2 ♦Sep 20 '17 at 0:27
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Are the connections to the horn loose?Check the connecting wires it should be firm– DhKoSep 20 '17 at 6:41
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@Pᴀᴜʟsᴛᴇʀ2 thanks, might be in over my head though!– RodSep 20 '17 at 16:07
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You will have to test the system logically :
1 supply - is it intermittent
2 switch for operation
3 supply to relay
4 relay
5 supply to horn
6 horn
7 earthing of horn but you can do this first as it is a common issue.
For testing use a test lamp or multimeter : lamp probably better in this case as it gives a more "visual" response when power is there...
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This is a great list of things to check. How would the OP go about checking any single part you've mentioned? A list of bad parts is great, but instructions would make this answer great!– Pᴀᴜʟsᴛᴇʀ2 ♦Sep 20 '17 at 18:49