Turn Signal Warning Chime
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
The turn signal warning chime sounds when the vehicle is driven in excess of 1/2 mile (0.805 km) with the right or left turn signal active continuously. The instrument cluster receives distance traveled information from the ABS module over the SCP communication network and receives turn signal activity information from the multifunction switch.