"TURN SIGNAL ON? - 24" Message: Notes
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The DIC displays the TURN SIGNAL ON? - 24 message when the IPC determines that the turn signal is active for more than 1.29 km (0.8 mi). The IPC sends a class 2 message to the radio in order to activate the audible warning.