Turn Signals
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the right or left turn signal indicator when a turn signal or a hazard request is received. The IPC receives a discrete input from the turn signal switch requesting illumination. If the BCM determines that the turn signal is active for more than 1.2 km (0.75 mi), the BCM activates the audible warning.