I have a 2007 silverado 1500 (new body style) and the horn just quit working. Doesn't work will keyless entry remote or by pushing on steering wheel

There could be a fuse or relay issue since multiple systems became inoperative simultaneously. I'd suspect that when the alarm went off, someone targeted and disabled the horn system so that it wasn't honking inside the repair facility. Both the horn switch and cruise control switch are located in the steering wheel and therefore they share common components and circuitry. Try checking under-hood fuses #7 (7.5A), #13 (20A), #15 (40A) and #20 (40A), as well as under-dash fuses #7 (7.5A) and 21 (7.5A). If all these fuses are OK, much deeper diagnosis will need to be performed. One somewhat common failure item is the spiral cable (also called a clock spring) that transfers power to the steering wheel (while allowing it to turn). That part can be seen within the steering angle replacement procedure shown here: https://www.yourmechanic.com/article/how-to-replace-a-steering-angle-sensor-by-marvin-sunderland

Do you have an air bag light lit on the instrument cluster ? Do you have C.C. button's on the steering wheel , do they work ? If the alarm fob (as u call it ) Can make the horns sound , the relay is sending B+ voltage to the horns Don't know how your testing.
System Description
The horn system consists of the following components:
• Horn fuse
• Horn relay
• Horn switch
• Horn(s)
• Body Control Module (BCM)
System Operation
The vehicle horns are activated under the following conditions:
• The horn switch is depressed.
• The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:
- When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
- When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.
- When the OnStar® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.

Circuit Operation
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The body control module BCM may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horn(s) through the horn control circuit. The horn(s) sound as long as ground is applied to the horn relay control circuit.

check fuses and relays --horn switch --clockspring --wire harness

The vehicle horns are activated under the following conditions:
?€¢
The horn switch is depressed.

?€¢
The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:

-
When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.

-
When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.

-
When the OnStar?® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.

-
When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry

System Description
The horn system consists of the following components:
?€¢
HORN fuse

?€¢
Horn relay

?€¢
Horn slip ring

?€¢
Horn switch

?€¢
Horn assembly

?€¢
Body Control Module (BCM)

System Operation
The vehicle horn system is activated under the following conditions:
?€¢
The horn switch is depressed.

?€¢
The body control module (BCM) commands the horns on. The BCM commands the horns on under any of the following conditions:

-
When the panic button is depressed on the remote control door lock transmitter. For further information refer to Keyless Entry System Description and Operation .

-
When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation .

When you push the horn switch (button) on the steering wheel ,do the horns work then ? The BCM - body control module energizes the horn relay for keyless entry operation . Start by having BCM checked for DTC'S - diagnostic trouble codes .

Have you had it checked to see if DTC'S - diagnostic trouble codes stored in the BCM - body control module ? That's the first thing you should have done . Dealer or other independent reair shop that has a factory or professional type scan tool . Auto part stores can't pull these codes .
The keyless entry system has the following main components:
• The transmitters
• The body control module (BCM)
• The remote control door lock receiver (RCDLR)--When you press a button on the transmitter, the transmitter sends a signal to the RCDLR. The RCDLR receives the signal and sends a serial data message requesting the appropriate function from the BCM.
• Keyless Entry Antenna which is a coaxial cable that runs from the RCDLR to the back glass. It attaches with a 9 volt battery style connection to a grid on the back glass, this style antenna is used to increase range and performance for Keyless Entry and Remote Vehicle Start systems .

Horn will sound only after keyless entry system has checked all doors and sensors are in locked condition,
including all doors, hood , truck and other locks. I have copied the sensor locations for you and circuit diagram
for keyless/burglar system. Hope this will help.
Component Location



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check for broken wires the neagative is by the horn button in the steering wheel has air bag ever been replaced in steering wheel if so the wire may have not been plugged in

my keyless entry has been working great we went on vacation. it quit working i cheched the fuses and the battery in the remote everything is fine just does not work anymore