Engine Coolant

ENGINE COOLANT TEMPERATURE
The IPC illuminates the engine coolant temperature indicator when the IPC determines that the coolant temperature is greater than 123°C (253°F). The IPC receives a class 2 message from the PCM indicating the coolant temperature. The IPC sends a class 2 message to the Body Control Module (BCM) indicating that the engine coolant temperature indicator is illuminated. The BCM sends a class 2 message to the radio in order to activate an audible warning.

LOW ENGINE COOLANT
The IPC illuminates the low engine coolant indicator when the following occurs:
^ The Body Control Module (BCM) detects a low coolant level condition (signal circuit is low) for greater than 10 seconds and the ignition is ON. 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 low engine coolant indicator is illuminated. The BCM sends a class 2 message to the radio in order to activate an audible warning.
^ The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.