Coolant Level Sensor
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If the coolant level in the expansion tank decreases below a predetermined value, the coolant level sensor connects a ground to the Body Control Module/Gateway Module (BCM/GWM) assembly, which 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