Over Speed Indicator
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the OVER SPEED indicator in the message center when the BCM detects the vehicle speed is above 120 km/h (75 mph). The IPC receives a class 2 message from the BCM requesting illumination of the over speed indicator.