Low Engine Coolant-15
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The DIC displays the LOW ENGINE COOLANT-15 message when the IPC detects a high voltage level on the signal circuit, a low coolant level condition. The DIC receives a class 2 message from the IPC requesting illumination.