Horn: Description and Operation

Horns System Description and Operation

System Description

The horn system consists of the following components:

* F11RA 15A fuse

* Horn relay

* Horn switch

* Turn signal multifunction switch

* Left and right horns

* Body control module (BCM)

System Operation

* The vehicle horn is activated whenever the horn switch is depressed.

* When the Predestrian Friendly Alert System is activated by pressing a button on the end of the turn signal/multifunction stalk.

* 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 Theft Systems.

- 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 Description and Operation.

- When the hybrid powertrain control module 2 begins charging the vehicle. For further information refer to Plug-In Charging System Description and Operation Description and Operation.

- When the hybrid powertrain control module 2 detects that the vehicle charging has been interrupted for any reason before the vehicle is fully recharged. For further information refer to Plug-In Charging System Description and Operation Description and Operation

- When the hybrid powertrain control module 2 detects a disconnect of the charge cord while the vehicle is locked. Refer to the appropriate section of the owner's manual for further information.

Horn Operation

Normal Horn 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 energizes the 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.

Predestrian Friendly Alert System

Extended Range Electric Vehicles (EREV) present a situation for visually impaired pedestrians who cannot hear an approaching EREV. The Predestrian Friendly Alert System offers the driver the ability to warn a visually impaired pedestrian, in a non-startling manner, that the vehicle is approaching. When the driver presses the predestrian friendly alert switch located on the end of the turn signal/multifunction stalk, the BCM will command an 8 cycle horn chirp burst lasting 217.5 ms