Engine Coolant Level Sensor

If the engine coolant level in the coolant expansion tank decreases below a predetermined value, the engine coolant level sensor connects a ground to the Body Control Module/Gateway Module (BCM/GWM) assembly. The BCM/GWM sends a message to the Instrument Cluster (IC) on the High Speed (HS) Controller Area Network (CAN) comfort systems bus to display a warning message. For additional information, Refer to: INFORMATION AND MESSAGE CENTER