2006 Suburban 2500 blowing horn fuse. Happens when driving and not using horn. I can replace fuse, drive, and it will work for a while and then will not work. Sometimes will blow right away, sometimes after arriving at my destination, shotting engine off, and begin the return home it blows. Have replaced both horns (needed to do this anyway), the contacts in steering wheel, and relay. Looked for short but most of the wire is still inside the harness. Before I start removing all the horn wiring, is there any place I should begin looking as the most likely sport for a short? Could the BCM be the culplrit? Nothing else would suggest a failing BCM. Thanks in advance.
Horn fuse keeps blowing
- Thread starter Csides
- Start date
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What does it mean that the engine has shut off and you "begin the return home?" Does that mean turning the steering wheel to center or something? Or starting the engine after it sits for a while?
The horn switch in the steering column completes the circuit ground to the BCM, which then triggers the horn relay to close, providing current to the horns through the horn fuse (15A). I would test between that fuse and the horns; see the circuit diagram for connections for testing.
Operation description (verify for your specific vehicle):
Circuit diagram here (again, verify your vehicle):
The horn switch in the steering column completes the circuit ground to the BCM, which then triggers the horn relay to close, providing current to the horns through the horn fuse (15A). I would test between that fuse and the horns; see the circuit diagram for connections for testing.
Operation description (verify for your specific vehicle):
Horn: Description and Operation — 2005 Chevrolet Suburban 1/2 Ton 2WD V8-5.3L VIN T Service Manual | Operation CHARM
Detailed repair manual for the 2005 Chevrolet Suburban 1/2 Ton 2WD V8-5.3L VIN T.
charm.li
Circuit diagram here (again, verify your vehicle):
Electrical Diagrams — 2005 Chevrolet Suburban 1/2 Ton 2WD V8-5.3L VIN T Service Manual | Operation CHARM
Detailed repair manual for the 2005 Chevrolet Suburban 1/2 Ton 2WD V8-5.3L VIN T.
charm.li
Thanks for the reply. Your question what does it mean the engine has shut off and "you begin to return home" was my attempt to describe that sometimes on a trip the horn works to my destination (I would occasionally test it), but then at some point when I began the return trip, either at start up or while driving, it would blow. I am not great with automotive electrical, so can you explain how I would go about testing between the fuse and the horns? I have a multimeter, but none of the more sophisticated auto testing equipment.
Thanks again for your reply.
I would ohm test between horn and horn relay & fuse, then also test between steering wheel horn contact and relay & fuse.\
that may or may not show anything because it is intermittent. I would lean towards it being between the horn and relay just because
also if you did not replace the relay already I would do that it is the most likely culprit overall.
Look a the circuit diagram -- the control connection between the steering wheel and the BCM is a ground (current limited because it's a control circuit), and is way before the horn fuse, so that's not going to be in play here. Your short will be at or after the horn fuse and is a power-to-ground on the load circuit, so look for a short at the feed side of the fuse, through the fuse socket, and on to the horns.
The fuse protects its socket and everything after, which is just wiring and horns, provided I selected the correct vehicle in the link I posted.
Might want to pull the underhood fusebox to see if there's corrosion, a loose or damaged wire, or a compromised connection.
The fuse protects its socket and everything after, which is just wiring and horns, provided I selected the correct vehicle in the link I posted.
Might want to pull the underhood fusebox to see if there's corrosion, a loose or damaged wire, or a compromised connection.
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