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:

Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant
Pipe Joint Compound Note: Three types of sealer are commonly used in engines. These are RTV sealer, anaerobic gasket eliminator sealer, and pipe joint compound. The correct sealer and amount must be used in the proper location to prevent oil leaks. DO NOT interchange the 3&# ...

Automatic Transmission Shift Lock Control Function Check
Warning: When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured. Before starting this check, be sure there is enough room around the vehicle. It should be parked on a level surface. Apply the parking brake. Be read ...

Control Valve Body Assembly Removal
Table 1: Control Valve Body Cover Removal Table 2: Control Solenoid (With Body and TCM) Valve Assembly Removal Table 3: Control Valve Body Assembly Removal Control Valve Body Cover Removal Control Valve Body Cover Removal ...

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