Vehicle Overspeed Warning
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The IPC sends a class 2 message to the radio or to the chime module (UL5 RPO code) to activate the vehicle overspeed chime warning when the IPC detects that the vehicle speed is greater than 120 km/h (75 mph). The vehicle overspeed chime sounds at a medium rate of 150 pulses per minute and lasting for about 5 seconds.