I have a ghost I cannot locate. I have had two instances in the last few months where I awaken to a blowing horn (constant) in the middle of the night. A quick battery disconnect fixes the problem. The next day everything is fine. Yesterday the same happened, but the horn remains constant after reconnection of the battery. I pulled the horn relay and checked in accordance with the FSM. Between pink and black I get 12V so the horn relay is not the problem. BTW, the horn button and contact wire were disconnected during the troubleshooting. The FSM points one toward a ground on the horn switch line (black 28 wire). Does anyone have an idea how to chase the ground? Is there an available exploded view of the horn switch and the associated wiring? What is the arrangement of the horn contact wire in relation to the switch, ground, and relay? Any way the problem could be the connector at the relay? Definitely a ground on wire 28....

Any help would be appreciated.

Thanks in advance Robert

 

When my alarm horn would go off every once in awhile, I found the passenger side "door ajar" switch was bad. I replaced the switch and everything was fine.

Just something to check if all else fails.

 

Thanks, but I thought if the horn was constant then the grounding was on the horn side, not the alarm side?? Any thoughts?

 

Mines a 96. Horn just stopped working one day. checked the fuse and it was blown. Replaced the fuse but horn didn't work. I went to disconnect the plug-ins on the horns themselves when the right one came on. It didn't pulsate like a timed on/off relay. It sounded intermitently according to how I wiggled the plug. The left one wouldn't do anything. I then used my volt meter to check across the plug-in for the horn. Both horns have 12 volts constantly. I want to check the horn relay but I don't know where it's located. Any advise?

 

Just got through working on an '85 with a horn blaring problem. I checked the relay, it was shorted across. Checked fuse, it was blown. I had a another relay and put in a new fuse. About a 1/2 hr. later the horn started blaring. On the relay there are two black wires. One goes to the horn switch and the other goes to the alarm module under the breadbox. I pulled the connector off the alarm module and the horn shut off. It worked when I pushed on the horn button. I happened to have another alarm module. I installed it and it hasn't had any problems for over a week. Interesting that the horn didn't blast on and off like when the alarm is triggered by unlocking the door manually after it's set. I guess it depends on which part of the module circuitry the problem resides on. I didn't want to cut the black wires off the relay because I didn't know which one went to the horn and which one went to the module. There is no slack back on the relay harness to mess with. So I dropped the passenger hush panel and reached up and unplugged the harness from the module. A looks like a pain to remove the module, I just plugged the replacement one I had onto the harness and zipped tied it off. I had to drop the ECM to be able to find the wiring and alarm module. It's right in the vicinity of where the ECM wiring connects to the ECM. Good luck.

Art

 

Sharkmech,

I am not sure on the 96, but on the earlier C4s the horn relay is behind the Driver Information Center (above radio).

Good Luck

 

Jus an update, the problem has disappeared. I hope it is fixed, but only time will tell. I pulled the steering wheel and replaced the horn contact retainer. It is a small plastic piece that seems to ensure spring contact.

http://www.ecklers.com/product.asp?p...5&dept_id=1716

We will see..... Robert

 

I just bought a '96 Vette and the horn doesn't work. I haven't checked the fuse or anything else. After reading the previous comments, I am worried that once i fix this problem, the horn will sound off one day in the middle of the night. If this really happens then that sucks! I do however need to fix it when it comes to inspection time. hmm....hopefully if it's a fuse problem i can replace the fuse before inspection and afterwards i'll just disconnect the fuse. i dont know.

 

FYI, instead of pulling the fuse, you can disconnect the wires where they connect to the horns (about 6 inches from horn at least on my 88) if you have a horn blowing problem from whatever issue. However, I don't know that the Vettes have any more problem with this than any other car since it is pretty much the same kind of circuit.

 

I have the same problem. I noticed a few months back that if I pulled on the inside of the steering wheel when I got out of the car the horn would blow. Yesterday same thing happened and if I touched it even lightly it would blow. Today a neighbor came and told me my horn was on all the time - disconnected the hot wire to both horns. I think the problem is in the steering wheel contact on each side for the horn. Something must be worn or broken and even the lightest touch on the horn "button" will set it off or like I said if I pull lightly on the steering wheel near the horn buttons it will also blow. Now I need to figure out how to get in there without any problems with the air bag!

 

The horn buttons crack and crumble $60 off ebay and ten min fix. Make sure you pull power and wait ten min before you pull the airbag.