Ford Mustang (2005-2014) Owners Manual: Audible warnings and indicators

Key In Ignition Warning Chime

Sounds when the key is left in the ignition in the off or accessory position and the driver’s door is opened.

Keyless Warning Alert (If Equipped)

Sounds when the keyless vehicle is in RUN and the driver’s door is opened.

Headlamps On Warning Chime

Sounds when the headlamps or parking lamps are on, the ignition is off (the key is not in the ignition) and the driver’s door is opened.

Parking Brake On Warning Chime

Sounds when you have left the parking brake on and drive your vehicle.

If the warning chime remains on after you have released the parking brake, have the system checked by your authorized dealer immediately.