Check Gauges Indicator

The IPC illuminates the CHECK GAGES indicator when any of the following occur:
^ The PCM sends coolant temperature to the BCM via class 2. The BCM detects that the engine coolant temperature is greater than 253°F (123°C). The IPC receives a class 2 message from the BCM requesting illumination. The IPC sends a class 2 message to the BCM indicating that the indicator is illuminated. The BCM sends a class 2 message to the radio in order to activate an audible warning.
^ The PCM sends fuel level data to the BCM via class 2, and the BCM detects that the fuel level is less than 4 percent. The IPC receives a class 2 message from the BCM requesting illumination. The IPC sends a class 2 message to the BCM indicating that the indicator is illuminated. The BCM sends a class 2 message to the radio in order to activate an audible warning.