Description And Operation: Horn
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
There are 2 separate conditions that can cause the horn to sound. The horn sounds if the driver presses the horn switch and when the vehicle security system is armed. The horn system uses the smart junction box (SJB) to provide voltage to the horns, while the horn switch or the SJB can provide the ground to engage the horn relay. The horn switch is integrated into the air bag. For the removal and installation of the air bag, refer to SUPPLEMENTAL RESTRAINT SYSTEM article.