Horns System Description and Operation
System Description
The horn system consists of the following components:
| • | Underbonnet fuse block (contains a non-serviceable PCB Horn relay) |
| • | Body control module (BCM) |
System Operation
| • | The vehicle horn is activated whenever the horn switch is depressed. |
| • | The BCM commands the horns ON under any of the following conditions: |
| - | 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 personalisation. For further information refer to
Keyless Entry System Description and Operation : with ATH → without ATH . |
Circuit Operation
The BCM controls the horn operation, when the horn switch is pressed, it closes a switch pulling the horn signal circuit low. When the BCM detects the drop in voltage in the horn switch signal circuit, it energises the PCB Horn relay which provides B+ voltage to the horn control circuit, sounding the horn.
When the vehicle is in the Off Power Mode the BCM will attempt to detect a stuck or continuously activated horn switch. When enabled, activation of the horn will be limited to 10 seconds to protect the horn from excessive use.
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