Chevrolet Sonic Repair Manual: 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)
- 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:
Backup Lamp Bulb Replacement (Sedan)
Backup Lamp Bulb Replacement
Callout
Component Name
Preliminary Procedure
Remove the tail lamp assembly. Refer to Tail Lamp Replacement.
1
Back Up Lamp Bulb Socket
Procedure
Rotate the back u ...
Battery Inspection/Test
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic
procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic
catego ...
Shift Fork Cleaning and Inspection (Gen 2)
Warning: Wear safety glasses to avoid injury when using compressed
air or any cleaning solvent. Bodily injury may occur if fumes are inhaled
or if skin is exposed to chemicals.
Clean the following components with a suitable solvent.
Air dry all the parts.
3rd and ...
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