Well all the buttons on my 2004 maxima steering wheel have stopped working and the horn. I also have the air bag sign blinking on the dash board. It was working good, but after i left the shop they weren't working anymore. Please help, thanks.

It depends on what's wrong with it . Does your vehicle have any other buttons on the steering wheel ? cruise control , radio control etc... Is the air bag light lit on the instrument cluster ? A common part that fails in all make an model vehicles is the clock spring . It's located under the steering wheel on top of the steering column . If any other buttons on the steering wheel aren't working an the air bag light is lit more then likely the clock spring is bad .Watch this video . https://www.youtube.com/watch?v=UMbGhxdXrUc
If not this could be the horn relay , https://www.youtube.com/watch?v=WDn4ZKJsdpY

Testing electrical circuits are required to find the problem .

Do you have a air bag light lit on the instrument cluster ? I ask this because , if the air bag light is lit , could be a clock spring problem . I know ,what the heck is this guy talking about . You have a air bag on the steering wheel ,the horn button is on the steering wheel . The clock spring is located under the steering wheel , in the top of the steering coulmn . It has flat wire tape in side that allows the steering wheel to be turned full left to full right , keeping the horn , air bag , an any other button's on the steering wheel connected electricly to the vehicle. Plus there is a relay , when you push the horn button it energizes the relay turning on the horns. Watch these videos , will explain a little better .
VEHICLE RELAYS Operation Diagnosis
How cars clock spring works

The horn relay is located in the under hood fuse box .

Pull the air bag fuse or disconnect the negative battery cable an wait a few minutes , then you can remove the air bag safely . What country are you from ? Do you have an air bag light lit on the dash as well ? Possible clock spring problem , it's located inside the steering column under the steering wheel . This clock spring allows the steering wheel to turn from right to left keeping the air bag , horn , speed control ( if you have the buttons on the steering wheel ) . Connected electrically . There is also a relay located in a fuse / relay box . Do you know what a relay is ? VEHICLE RELAYS Operation Diagnosis

renew the air bags with some from a scrap vehicle ,its that simple

I have or should say had same issue on 1996 cirrus quick fix just remove the HORN RELAY located on the left side of dash relay only controls horn. To really solve the issue at hand you must replace the clock spring on the steering wheel dis-arm air bag before messing with steering wheel to avoid activation of air bag disconnect battery for 10 min then its safe to fiddle with steering wheel safely.
Chino S.G.V

Ignition Switch Removal & Installation To Remove:

1. Disconnect battery negative cable.
2. Disarm air bag system.
3. Remove driver air bag module.
4. Loosen screw and lift horn pad to remove.
5. Remove lock nut and washer. CAUTION
   Do not hammer on steering wheel. Damage can occur to the energy absorbing portion of the steering column.
   
6. Pull dynamic damper forward and lift up to remove.
7. Remove steering wheel.
8. Remove steering column shrouds.
9. Remove lower cover.
10. Remove multifunction switch.
11. Remove entire lower portion of dash.
12. Remove mounting fasteners and lower steering column.
13. Remove bolts and separate ignition switch from steering column.

To Install:

1. Install ignition switch to steering column and install bolts.
2. Raise steering column and install mounting fasteners.
3. Install lower portion of dash.
4. Install multifunction switch.
5. Install lower cover.
6. Install steering column shrouds.
7. Install steering wheel.
8. Install dynamic damper.
9. Install washer and lock nut.
10. Lift horn pad and install screw.
11. Install driver air bag module.
12. Connect battery negative cable.

I wonder,, with colder tempratures this time of year, If somehow a connection in the horn pad was shorting out.due to expansion or contraction of a component inside the steering wheel. Try tapping on the top of the air bag on the steering wheel and horn buttons ..this may work ..note this is a guess and I hope this does it the only reason I mentioned it Is because I have seen this two other times...Good luck.

The computer controls the horn and looks for a signal from the Remote Keyless Entry system or the horn button. Due to the fact that the horn works with the RKE but not when you press the horn button, would cause me to suspect that the Clock Spring mechanism, which is also used to activate the Driver's Air Bag, might be malfunctioning. When the Clock Spring breaks, the computer does not get a signal from the horn button so it can not opperate the horn. If I remember correctly, when the Clock Spring goes out, the Air Bag light on the dash either does not light up for 2 seconds when you first start the vehicle, or it comes on and stays on all the time, which is to let you know that the Air Bag is not functioning, and the primary cause is the Clock Spring. So check your owners manual to see if the Air Bag warning light on the dash is functioning normally. Your local Chrysler dealer can quickly and easily check the function of the Clock Spring, Horn, and Air Bag system, through the use of the DRB scan tool. If it is in fact the Clock Spring that is malfunctioning, the Air Bag module and the steering wheel must be removed in order to replace the Clock Spring, which should be left to a trained professional, that has been educated on the proper handling of the Air Bag system. You wouldn't want to accidentally deploy the Air Bag, as you could be injured. That and Air Bag modules can be expensive to replace.

Hello, although from your brief description of fault May I offer assistance? Not on a Chevrolet but a Volvo 740, the Button on the steering wheel for the horn are Copper semi circular type and sprung loaded. Me being ham fisted with annoyance pushed the button too hard, it worked ok at the time of use but a few minutes later World WAR 3! had to pull plug on horns themselves to silence them.
So FixYa resolution? Check Horn button itself Cuz it'll be stuck!
Cheer's
Paul 'W'
Onyer~EDson(:0)~[><

If the air bag light is blinking count the blinks for the code. Example.. If the air bag light flashes once and then a short pause and then two blinks you would have a code 12. and so on. If it just stays on you will need to take it into a repair shop and get it checked. My best guess without looking at it would be that the clockspring is not working properly. Most of the time when the clockspring goes out other things stop working like the horn or cruise control or something that is on the steering wheel. Hope this helps.