Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Horns System Description and Operation

Chevrolet Sonic Repair Manual / Body / Body Electrical / Horn / Horns System Description and Operation

System Description

The horn system consists of the following components:

  • HORN fuse
  • Underhood fuse block (contains PCB horn relay)
  • Horn switch
  • Horn
  • Body control module (BCM)
K84Keyless Entry Control ModuleS33Horn SwitchK73Telematics Communication Interface Control ModuleK9Body Control ModuleX50AFuse Block - UnderhoodP12Horn
System Operation

The vehicle horn system is activated under the following conditions:

  • When the horn switch is depressed
  • The BCM commands the horns ON under any of the following conditions:
    • When the content theft deterrent system detects a vehicle intrusion?€”For further information refer to Theft Systems Description and Operation.
    • 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 the OnStar?® system is used to sound the horns if equipped?€”For further information, refer to OnStar Description and Operation.

Circuit Operation

Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing either of the horn switches applies ground to the horn relay control circuit. The 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 horns through the horn control circuit. The horns sound as long as ground is applied to the horn relay control circuit.

Horn Replacement
Horn Replacement Callout Component Name Preliminary Procedure Remove the front wheelhouse liner front. Refer to Front Wheelhous ...

Steering Wheel Horn Contact Replacement
Steering Wheel Horn Contact Replacement Callout Component Name Preliminary Procedure Remove the steering wheel inflatable restr ...

Other materials:

Trip Computer
The trip computer is located in the Driver Information Center (DIC). It provides the driver with driving information such as average speed, fuel range, average fuel economy, and a timer. 1. SET/CLR: Press to set or clear the menu item displayed. This is not used to reset the trip odometer. T ...

Hub/Axle Flange and Wheel Stud Runout Inspection
Special Tools GE-8001 Dial Indicator Set , or equivalent Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. Mark the location of the wheels to the wheel studs and mark the specific vehicle position on each tire and wheel – LF, LR, RF, RR. Remove the tire and ...

Bushing and Mating Shaft Inspection
Note: Proper bushing and corresponding mating shaft inspection should be performed before replacing the bushing, shaft, and in some cases, the component which houses the bushing. Thoroughly clean and dry the bushing and shaft surfaces before inspecting for damage. Any of the followin ...

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