The little contact could have bent and is sitting on the ring, you may have to bend it so it only makes contact when you push on the horn pad. things should fit easily if the force it things can get bent out of their original shape and cause issues.
SOURCE: 1997 Suburban and horn not working
behind the airbag is the horn switch i dont reccomend checking the the switch unless you know how to disarm the srs systems but i accidently leaned on it once pushed the plate in and when i pushed on it it went off but if i took my hand off it it would go back on otherwise their could just be a simple short
SOURCE: Broken Horn won't *******- 2003 Chevrolet Malibu
Hi. If your airbag has not deployed, you don't have to replace it. The airbag may have to be removed to get at the horn circuit. Try taking it to an independent auto repair place. I'll be willing to bet that they'll give you a better price for the repair. Good luck! ricardok45
SOURCE: 2003 Chevy Venture - Horn has started randomly
Chances are you have a faulty clock spring in the steering wheel, you will most likely need to have it replaced.
SOURCE: Need to remove 2000 Malibu steering wheel to put
Are you replacing the signal switch because you are having problems with your turn signals working? If you are don't replace it yet. There's a recall for the 2000 chevy malibus.
RECALLS SUMMARY
Vehicle Make / Model:
Model Year(s):
CHEVROLET / MALIBU
2000-2001
OLDSMOBILE / ALERO
2000-2001
PONTIAC / GRAND AM
2000-2001
NHTSA CAMPAIGN ID Number:
03V327000
Summary:
CERTAIN PASSENGER VEHICLES HAVE HAZARD WARNING SWITCHES THAT MAY EXPERIENCE SOLDER JOINT CRACKING CAUSED BY RAPID TEMPERATURE TRANSITIONS AND THE SOLDERING PROCESS. IF SOLDER JOINT CRACKING OCCURS AND RESULTS IN AN OPEN CIRCUIT, THE TURN SIGNALS/HAZARD LAMPS BECOME INTERMITTENT OR INOPERATIVE.
Consequence:
WHEN THE TURN SIGNALS ARE INOPERATIVE, THE DRIVER CANNOT USE THEM TO SIGNAL INTENT TO TURN THAT COULD RESULT IN A CRASH.
Remedy:
DEALERS WILL REPLACE THE HAZARD WARNING SWITCH. OWNER NOTIFICATION BEGAN ON FEBRUARY 5, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438, PONTIAC AT 1-800-620-7668, OR OLDSMOBILE AT 1-800-630-6537.
Notes:
GM RECALL NO. 03043. CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION¿S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
Also If you want to check out other recalls go to http://www-odi.nhtsa.dot.gov/cars/problems/recalls/recallsearch.cfm
SOURCE: 2000 Tahoe Horn broken
You can remove the horn relay and use a Ohm meter and check the resistance between the horn relay connector terminal No. 86 (Black Wire) and ground. If the ohms are less then 5 ohms replace the horn relay. There are a lot more tests but as Polarcycle states you can do what he suggested other then I believe you have two horns in this vehicle.
Steering wheel attachment. Courtesy of General Motors Corporation, Service Technology Group. 
To remove the snap ring, use the compressing tool to relieve the pressure against the snap ring. Courtesy of General Motors Corporation, Service Technology Group. 
Remove the turn signal switch from the column. Courtesy of Chrysler Corporation. 304 views
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